package com.glview.view;
import java.util.ArrayList;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.os.Build;
import android.os.SystemClock;
import android.util.AttributeSet;
import android.util.Log;
import android.view.InputDevice;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.TextureView;
import com.glview.R;
import com.glview.animation.LayoutTransition;
import com.glview.graphics.PointF;
import com.glview.graphics.Rect;
import com.glview.hwui.GLCanvas;
import com.glview.view.animation.Animation;
import com.glview.view.animation.AnimationUtils;
import com.glview.view.animation.LayoutAnimationController;
public abstract class ViewGroup extends View{
private static final int ARRAY_INITIAL_CAPACITY = 12;
private static final int ARRAY_CAPACITY_INCREMENT = 12;
// Child views of this GLViewGroup
protected View[] mChildren;
protected int mChildrenCount;
// Whether layout calls are currently being suppressed, controlled by calls to
// suppressLayout()
boolean mSuppressLayout = false;
// Whether any layout calls have actually been suppressed while mSuppressLayout
// has been true. This tracks whether we need to issue a requestLayout() when
// layout is later re-enabled.
private boolean mLayoutCalledWhileSuppressed = false;
// The view contained within this GLViewGroup that has or contains focus.
protected View mFocused;
// Layout animation
private LayoutAnimationController mLayoutAnimationController;
private Animation.AnimationListener mAnimationListener;
// First touch target in the linked list of touch targets.
private TouchTarget mFirstTouchTarget;
// For debugging only. You can see these in hierarchyviewer.
private long mLastTouchDownTime;
private int mLastTouchDownIndex = -1;
private float mLastTouchDownX;
private float mLastTouchDownY;
private final static String TAG = "GLViewGroup";
private LayoutTransition mTransition;
// The set of views that are currently being transitioned. This list is used to track views
// being removed that should not actually be removed from the parent yet because they are
// being animated.
private ArrayList<View> mTransitioningViews;
// List of children changing visibility. This is used to potentially keep rendering
// views during a transition when they otherwise would have become gone/invisible
private ArrayList<View> mVisibilityChangingChildren;
/**
* GLViews which have been hidden or removed which need to be animated on
* their way out.
* This field should be made private, so it is hidden from the SDK.
*
*/
protected ArrayList<View> mDisappearingChildren;
protected int mGroupFlags;
/**
* When set, the drawing method will call {@link #getChildDrawingOrder(int, int)}
* to get the index of the child to draw for that iteration.
*
* @hide
*/
protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400;
/**
* When set, this ViewGroup should not intercept touch events.
* {@hide}
*/
protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000;
/**
* When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate.
*/
private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000;
/**
* When set, this ViewGroup's drawable states also include those
* of its children.
*/
private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000;
/**
* When set, this group will go through its list of children to notify them of
* any drawable state change.
*/
private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000;
/**
* When set, this ViewGroup will not dispatch onAttachedToWindow calls
* to children when adding new views. This is used to prevent multiple
* onAttached calls when a ViewGroup adds children in its own onAttached method.
*/
private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000;
/**
* This constant is a {@link #setLayoutMode(int) layoutMode}.
* Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top},
* {@link #getRight() right} and {@link #getBottom() bottom}.
*
* @hide
*/
public static final int CLIP_BOUNDS = 0;
/**
* This constant is a {@link #setLayoutMode(int) layoutMode}.
* Optical bounds describe where a widget appears to be. They sit inside the clip
* bounds which need to cover a larger area to allow other effects,
* such as shadows and glows, to be drawn.
*
* @hide
*/
public static final int OPTICAL_BOUNDS = 1;
/*
* The layout mode: either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}
*/
private int mLayoutMode = CLIP_BOUNDS;
// When set, ViewGroup invalidates only the child's rectangle
// Set by default
static final int FLAG_CLIP_CHILDREN = 0x1;
// When set, ViewGroup excludes the padding area from the invalidate rectangle
// Set by default
private static final int FLAG_CLIP_TO_PADDING = 0x2;
// When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when
// a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set
static final int FLAG_INVALIDATE_REQUIRED = 0x4;
// When set, dispatchDraw() will run the layout animation and unset the flag
private static final int FLAG_RUN_ANIMATION = 0x8;
// When set, there is either no layout animation on the ViewGroup or the layout
// animation is over
// Set by default
static final int FLAG_ANIMATION_DONE = 0x10;
// If set, this ViewGroup has padding; if unset there is no padding and we don't need
// to clip it, even if FLAG_CLIP_TO_PADDING is set
private static final int FLAG_PADDING_NOT_NULL = 0x20;
// Layout Modes
private static final int LAYOUT_MODE_UNDEFINED = -1;
/**
* This constant is a {@link #setLayoutMode(int) layoutMode}.
* Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top},
* {@link #getRight() right} and {@link #getBottom() bottom}.
*/
public static final int LAYOUT_MODE_CLIP_BOUNDS = 0;
/**
* This constant is a {@link #setLayoutMode(int) layoutMode}.
* Optical bounds describe where a widget appears to be. They sit inside the clip
* bounds which need to cover a larger area to allow other effects,
* such as shadows and glows, to be drawn.
*/
public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1;
/** @hide */
public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS;
/**
* We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL
* are set at the same time.
*/
protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL;
private static final int FLAG_MASK_FOCUSABILITY = 0x60000;
/**
* This view will get focus before any of its descendants.
*/
public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000;
/**
* This view will get focus only if none of its descendants want it.
*/
public static final int FOCUS_AFTER_DESCENDANTS = 0x40000;
/**
* This view will block any of its descendants from getting focus, even
* if they are focusable.
*/
public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000;
/**
* Used to map between enum in attrubutes and flag values.
*/
private static final int[] DESCENDANT_FOCUSABILITY_FLAGS =
{FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS,
FOCUS_BLOCK_DESCENDANTS};
// Indicates how many of this container's child subtrees contain transient state
private int mChildCountWithTransientState = 0;
/**
* Currently registered axes for nested scrolling. Flag set consisting of
* {@link #SCROLL_AXIS_HORIZONTAL} {@link #SCROLL_AXIS_VERTICAL} or {@link #SCROLL_AXIS_NONE}
* for null.
*/
private int mNestedScrollAxes;
public ViewGroup(Context context) {
this(context, null);
}
public ViewGroup(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
initViewGroup();
initFromAttributes(context, attrs, defStyleAttr, defStyleRes);
}
private void initViewGroup(){
mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS;
setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS);
mChildren = new View[ARRAY_INITIAL_CAPACITY];
mChildrenCount = 0;
}
private void initFromAttributes(
Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup, defStyleAttr,
defStyleRes);
final int N = a.getIndexCount();
for (int i = 0; i < N; i++) {
int attr = a.getIndex(i);
if (attr == R.styleable.ViewGroup_clipChildren) {
setClipChildren(a.getBoolean(attr, true));
} else if (attr == R.styleable.ViewGroup_clipToPadding) {
setClipToPadding(a.getBoolean(attr, true));
} else if (attr == R.styleable.ViewGroup_animationCache) {
// setAnimationCacheEnabled(a.getBoolean(attr, true));
} else if (attr == R.styleable.ViewGroup_persistentDrawingCache) {
// setPersistentDrawingCache(a.getInt(attr,
// PERSISTENT_SCROLLING_CACHE));
} else if (attr == R.styleable.ViewGroup_addStatesFromChildren) {
// setAddStatesFromChildren(a.getBoolean(attr, false));
} else if (attr == R.styleable.ViewGroup_alwaysDrawnWithCache) {
// setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true));
} else if (attr == R.styleable.ViewGroup_layoutAnimation) {
int id = a.getResourceId(attr, -1);
if (id > 0) {
setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id));
}
} else if (attr == R.styleable.ViewGroup_descendantFocusability) {
// setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr,
// 0)]);
} else if (attr == R.styleable.ViewGroup_splitMotionEvents) {
// setMotionEventSplittingEnabled(a.getBoolean(attr, false));
} else if (attr == R.styleable.ViewGroup_animateLayoutChanges) {
boolean animateLayoutChanges = a.getBoolean(attr, false);
if (animateLayoutChanges) {
setLayoutTransition(new LayoutTransition());
}
break;
}
}
a.recycle();
}
public static final int INVALID_POSITION = -1;
protected boolean mDrawSelectorOnTop = true;
public void setDrawSelectorOnTop(boolean onTop) {
mDrawSelectorOnTop = onTop;
}
public int indexOfChild(View view){
if(view == null){
return INVALID_POSITION;
}
for(int i = 0; i < mChildrenCount; i++){
if(mChildren[i] == view){
return i;
}
}
return INVALID_POSITION;
}
/**
* <p>Adds a child view. If no layout parameters are already set on the child, the
* default parameters for this GLViewGroup are set on the child.</p>
*
* <p><strong>Note:</strong> do not invoke this method from
* {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
* {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
*
* @param child the child view to add
*
* @see #generateDefaultLayoutParams()
*/
public void addView(View child) {
addView(child, -1);
}
/**
* Adds a child view. If no layout parameters are already set on the child, the
* default parameters for this GLViewGroup are set on the child.
*
*
* @param child the child view to add
* @param index the position at which to add the child
*
* @see #generateDefaultLayoutParams()
*/
public void addView(View child, int index){
LayoutParams params = child.getLayoutParams();
if (params == null) {
params = generateDefaultLayoutParams();
if (params == null) {
throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null");
}
}
addView(child, index, params);
}
/**
* Adds a child view with the specified layout parameters.
*
* <p><strong>Note:</strong> do not invoke this method from
* {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
* {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
*
* @param child the child view to add
* @param params the layout parameters to set on the child
*/
public void addView(View child, LayoutParams params) {
addView(child, -1, params);
}
/**
* Adds a child view with the specified layout parameters.
*
* <p><strong>Note:</strong> do not invoke this method from
* {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
* {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
*
* @param child the child view to add
* @param index the position at which to add the child
* @param params the layout parameters to set on the child
*/
public void addView(View child, int index, LayoutParams params) {
if(params == null){
params = generateDefaultLayoutParams();
} else if (!checkLayoutParams(params)) {
params = generateLayoutParams(params);
}
// addViewInner() will call child.requestLayout() when setting the new LayoutParams
// therefore, we call requestLayout() on ourselves before, so that the child's request
// will be blocked at our level
requestLayout();
invalidate();
addViewInner(child, index, params, false);
}
/**
* {@inheritDoc}
*/
public void updateViewLayout(View view, ViewGroup.LayoutParams params) {
if (!checkLayoutParams(params)) {
throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this);
}
if (view.mParent != this) {
throw new IllegalArgumentException("Given view not a child of " + this);
}
view.setLayoutParams(params);
}
/**
* {@inheritDoc}
*/
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p != null;
}
/**
* Returns a set of default layout parameters. These parameters are requested
* when the View passed to {@link #addView(View)} has no layout parameters
* already set. If null is returned, an exception is thrown from addView.
*
* @return a set of default layout parameters or null
*/
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams();
}
/**
* Returns a safe set of layout parameters based on the supplied layout params.
* When a GLViewGroup is passed a View whose layout params do not pass the test of
* {@link #checkLayoutParams(ViewGroup.LayoutParams)}, this method
* is invoked. This method should return a new set of layout params suitable for
* this GLViewGroup, possibly by copying the appropriate attributes from the
* specified set of layout params.
*
* @param p The layout parameters to convert into a suitable set of layout parameters
* for this GLViewGroup.
*
* @return an instance of {@link ViewGroup.LayoutParams} or one
* of its descendants
*/
protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) {
return p;
}
/**
* Returns a new set of layout parameters based on the supplied attributes set.
*
* @param attrs the attributes to build the layout parameters from
*
* @return an instance of {@link android.view.ViewGroup.LayoutParams} or one
* of its descendants
*/
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new LayoutParams(mContext, attrs);
}
/**
* Adds a view during layout. This is useful if in your onLayout() method,
* you need to add more views (as does the list view for example).
*
* If index is negative, it means put it at the end of the list.
*
* @param child the view to add to the group
* @param index the index at which the child must be added
* @param params the layout parameters to associate with the child
* @return true if the child was added, false otherwise
*/
protected boolean addViewInLayout(View child, int index, LayoutParams params) {
return addViewInLayout(child, index, params, false);
}
/**
* Adds a view during layout. This is useful if in your onLayout() method,
* you need to add more views (as does the list view for example).
*
* If index is negative, it means put it at the end of the list.
*
* @param child the view to add to the group
* @param index the index at which the child must be added
* @param params the layout parameters to associate with the child
* @param preventRequestLayout if true, calling this method will not trigger a
* layout request on child
* @return true if the child was added, false otherwise
*/
protected boolean addViewInLayout(View child, int index, LayoutParams params,
boolean preventRequestLayout) {
child.mParent = null;
addViewInner(child, index, params, preventRequestLayout);
// child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN;
return true;
}
private void addViewInner(View child, int index, LayoutParams params,
boolean preventRequestLayout) {
if (mTransition != null) {
// Don't prevent other add transitions from completing, but cancel remove
// transitions to let them complete the process before we add to the container
mTransition.cancel(LayoutTransition.DISAPPEARING);
}
if (child.getParent() != null) {
throw new IllegalStateException("The specified child already has a parent. " +
"You must call removeView() on the child's parent first.");
}
if (mTransition != null) {
mTransition.addChild(this, child);
}
if (!checkLayoutParams(params)) {
params = generateLayoutParams(params);
}
if (preventRequestLayout) {
child.mLayoutParams = params;
} else {
child.setLayoutParams(params);
}
if (index < 0) {
index = mChildrenCount;
}
addInArray(child, index);
// // tell our children
// if (preventRequestLayout) {
// child.assignParent(this);
// } else {
// child.mParent = this;
// }
child.mParent = this;
if (child.hasFocus()) {
requestChildFocus(child, child.findFocus());
}
AttachInfo ai = mAttachInfo;
if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) {
boolean lastKeepOn = ai.mKeepScreenOn;
ai.mKeepScreenOn = false;
child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK));
if (ai.mKeepScreenOn) {
needGlobalAttributesUpdate(true);
}
ai.mKeepScreenOn = lastKeepOn;
}
if (child.isLayoutDirectionInherited()) {
child.resetRtlProperties();
}
onViewAdded(child);
// if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) {
// mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE;
// }
//
// if (child.hasTransientState()) {
// childHasTransientStateChanged(child, true);
// }
}
/**
* {@inheritDoc}
*/
@Override
public void dispatchSetSelected(boolean selected) {
final View[] children = mChildren;
final int count = mChildrenCount;
for (int i = 0; i < count; i++) {
children[i].setSelected(selected);
}
}
/**
* {@inheritDoc}
*/
@Override
public void dispatchSetActivated(boolean activated) {
final View[] children = mChildren;
final int count = mChildrenCount;
for (int i = 0; i < count; i++) {
children[i].setActivated(activated);
}
}
@Override
protected void dispatchSetPressed(boolean pressed) {
final View[] children = mChildren;
final int count = mChildrenCount;
for (int i = 0; i < count; i++) {
final View child = children[i];
// Children that are clickable on their own should not
// show a pressed state when their parent view does.
// Clearing a pressed state always propagates.
if (!pressed || (!child.isClickable() && !child.isLongClickable())) {
child.setPressed(pressed);
}
}
}
/**
* {@hide}
*/
@Override
protected View findViewTraversal(int id) {
if (id == mID) {
return this;
}
final View[] where = mChildren;
final int len = mChildrenCount;
for (int i = 0; i < len; i++) {
View v = where[i];
v = v.findViewById(id);
if (v != null) {
return v;
}
}
return null;
}
public boolean hasContainDescendant(View descendant){
boolean ret = false;
while(descendant != null && descendant != this){
descendant = descendant.getParent();
}
if(descendant == this){
ret = true;
}
return ret;
}
/**
* Ask all of the children of this view to measure themselves, taking into
* account both the MeasureSpec requirements for this view and its padding.
* We skip children that are in the GONE state The heavy lifting is done in
* getChildMeasureSpec.
*
* @param widthMeasureSpec The width requirements for this view
* @param heightMeasureSpec The height requirements for this view
*/
protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) {
final int size = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < size; ++i) {
final View child = children[i];
if ((child.mViewFlags & VISIBILITY_MASK) != GONE) {
measureChild(child, widthMeasureSpec, heightMeasureSpec);
}
}
}
/**
* Ask one of the children of this view to measure itself, taking into
* account both the MeasureSpec requirements for this view and its padding.
* The heavy lifting is done in getChildMeasureSpec.
*
* @param child The child to measure
* @param parentWidthMeasureSpec The width requirements for this view
* @param parentHeightMeasureSpec The height requirements for this view
*/
protected void measureChild(View child, int parentWidthMeasureSpec,
int parentHeightMeasureSpec) {
final LayoutParams lp = child.getLayoutParams();
final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec,
mPaddingLeft + mPaddingRight, lp.width);
final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec,
mPaddingTop + mPaddingBottom, lp.height);
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
/**
* Ask one of the children of this view to measure itself, taking into
* account both the MeasureSpec requirements for this view and its padding
* and margins. The child must have MarginLayoutParams The heavy lifting is
* done in getChildMeasureSpec.
*
* @param child The child to measure
* @param parentWidthMeasureSpec The width requirements for this view
* @param widthUsed Extra space that has been used up by the parent
* horizontally (possibly by other children of the parent)
* @param parentHeightMeasureSpec The height requirements for this view
* @param heightUsed Extra space that has been used up by the parent
* vertically (possibly by other children of the parent)
*/
protected void measureChildWithMargins(View child,
int parentWidthMeasureSpec, int widthUsed,
int parentHeightMeasureSpec, int heightUsed) {
final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams();
final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec,
mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin
+ widthUsed, lp.width);
final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec,
mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin
+ heightUsed, lp.height);
child.measure(childWidthMeasureSpec, childHeightMeasureSpec);
}
/**
* Does the hard part of measureChildren: figuring out the MeasureSpec to
* pass to a particular child. This method figures out the right MeasureSpec
* for one dimension (height or width) of one child view.
*
* The goal is to combine information from our MeasureSpec with the
* LayoutParams of the child to get the best possible results. For example,
* if the this view knows its size (because its MeasureSpec has a mode of
* EXACTLY), and the child has indicated in its LayoutParams that it wants
* to be the same size as the parent, the parent should ask the child to
* layout given an exact size.
*
* @param spec The requirements for this view
* @param padding The padding of this view for the current dimension and
* margins, if applicable
* @param childDimension How big the child wants to be in the current
* dimension
* @return a MeasureSpec integer for the child
*/
public static int getChildMeasureSpec(int spec, int padding, int childDimension) {
int specMode = MeasureSpec.getMode(spec);
int specSize = MeasureSpec.getSize(spec);
int size = Math.max(0, specSize - padding);
int resultSize = 0;
int resultMode = 0;
switch (specMode) {
// Parent has imposed an exact size on us
case MeasureSpec.EXACTLY:
if (childDimension >= 0) {
resultSize = childDimension;
resultMode = MeasureSpec.EXACTLY;
} else if (childDimension == LayoutParams.MATCH_PARENT) {
// Child wants to be our size. So be it.
resultSize = size;
resultMode = MeasureSpec.EXACTLY;
} else if (childDimension == LayoutParams.WRAP_CONTENT) {
// Child wants to determine its own size. It can't be
// bigger than us.
resultSize = size;
resultMode = MeasureSpec.AT_MOST;
}
break;
// Parent has imposed a maximum size on us
case MeasureSpec.AT_MOST:
if (childDimension >= 0) {
// Child wants a specific size... so be it
resultSize = childDimension;
resultMode = MeasureSpec.EXACTLY;
} else if (childDimension == LayoutParams.MATCH_PARENT) {
// Child wants to be our size, but our size is not fixed.
// Constrain child to not be bigger than us.
resultSize = size;
resultMode = MeasureSpec.AT_MOST;
} else if (childDimension == LayoutParams.WRAP_CONTENT) {
// Child wants to determine its own size. It can't be
// bigger than us.
resultSize = size;
resultMode = MeasureSpec.AT_MOST;
}
break;
// Parent asked to see how big we want to be
case MeasureSpec.UNSPECIFIED:
if (childDimension >= 0) {
// Child wants a specific size... let him have it
resultSize = childDimension;
resultMode = MeasureSpec.EXACTLY;
} else if (childDimension == LayoutParams.MATCH_PARENT) {
// Child wants to be our size... find out how big it should
// be
resultSize = 0;
resultMode = MeasureSpec.UNSPECIFIED;
} else if (childDimension == LayoutParams.WRAP_CONTENT) {
// Child wants to determine its own size.... find out how
// big it should be
resultSize = 0;
resultMode = MeasureSpec.UNSPECIFIED;
}
break;
}
return MeasureSpec.makeMeasureSpec(resultSize, resultMode);
}
/**
* {@inheritDoc}
*/
@Override
public void layout(int l, int t, int r, int b) {
if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) {
if (mTransition != null) {
mTransition.layoutChange(this);
}
super.layout(l, t, r, b);
} else {
// record the fact that we noop'd it; request layout when transition finishes
mLayoutCalledWhileSuppressed = true;
}
}
/**
* {@inheritDoc}
*/
@Override
protected abstract void onLayout(boolean changed,
int l, int t, int r, int b);
/**
* Indicates whether the view group has the ability to animate its children
* after the first layout.
*
* @return true if the children can be animated, false otherwise
*/
protected boolean canAnimate() {
return mLayoutAnimationController != null;
}
/**
* Runs the layout animation. Calling this method triggers a relayout of
* this view group.
*/
public void startLayoutAnimation() {
if (mLayoutAnimationController != null) {
mGroupFlags |= FLAG_RUN_ANIMATION;
requestLayout();
}
}
/**
* Schedules the layout animation to be played after the next layout pass
* of this view group. This can be used to restart the layout animation
* when the content of the view group changes or when the activity is
* paused and resumed.
*/
public void scheduleLayoutAnimation() {
mGroupFlags |= FLAG_RUN_ANIMATION;
}
/**
* Sets the layout animation controller used to animate the group's
* children after the first layout.
*
* @param controller the animation controller
*/
public void setLayoutAnimation(LayoutAnimationController controller) {
mLayoutAnimationController = controller;
if (mLayoutAnimationController != null) {
mGroupFlags |= FLAG_RUN_ANIMATION;
}
}
/**
* Returns the layout animation controller used to animate the group's
* children.
*
* @return the current animation controller
*/
public LayoutAnimationController getLayoutAnimation() {
return mLayoutAnimationController;
}
/**
* Returns the basis of alignment during layout operations on this view group:
* either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}.
*
* @return the layout mode to use during layout operations
*
* @see #setLayoutMode(int)
*
* @hide
*/
public int getLayoutMode() {
return mLayoutMode;
}
/**
* Sets the basis of alignment during the layout of this view group.
* Valid values are either {@link #CLIP_BOUNDS} or {@link #OPTICAL_BOUNDS}.
* <p>
* The default is {@link #CLIP_BOUNDS}.
*
* @param layoutMode the layout mode to use during layout operations
*
* @see #getLayoutMode()
*
* @hide
*/
public void setLayoutMode(int layoutMode) {
if (mLayoutMode != layoutMode) {
mLayoutMode = layoutMode;
requestLayout();
}
}
/**
* Called when a view's visibility has changed. Notify the parent to take any appropriate
* action.
*
* @param child The view whose visibility has changed
* @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE).
* @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE).
* @hide
*/
protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) {
if (mTransition != null) {
if (newVisibility == VISIBLE) {
mTransition.showChild(this, child, oldVisibility);
} else {
mTransition.hideChild(this, child, newVisibility);
if (mTransitioningViews != null && mTransitioningViews.contains(child)) {
// Only track this on disappearing views - appearing views are already visible
// and don't need special handling during drawChild()
if (mVisibilityChangingChildren == null) {
mVisibilityChangingChildren = new ArrayList<View>();
}
mVisibilityChangingChildren.add(child);
addDisappearingView(child);
}
}
}
// in all cases, for drags
/*if (mCurrentDrag != null) {
if (newVisibility == VISIBLE) {
notifyChildOfDrag(child);
}
}*/
}
/**
* {@inheritDoc}
*/
@Override
protected void dispatchVisibilityChanged(View changedView, int visibility) {
super.dispatchVisibilityChanged(changedView, visibility);
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
children[i].dispatchVisibilityChanged(changedView, visibility);
}
}
/**
* {@inheritDoc}
*/
@Override
public void dispatchWindowVisibilityChanged(int visibility) {
super.dispatchWindowVisibilityChanged(visibility);
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
children[i].dispatchWindowVisibilityChanged(visibility);
}
}
/**
* @hide
*/
protected void onDebugDraw(GLCanvas canvas) {
/* // Draw optical bounds
if (getLayoutMode() == OPTICAL_BOUNDS) {
for (int i = 0; i < getChildCount(); i++) {
GLView c = getChildAt(i);
Insets insets = c.getOpticalInsets();
drawRect(canvas,
c.getLeft() + insets.left,
c.getTop() + insets.top,
c.getRight() - insets.right,
c.getBottom() - insets.bottom, Color.RED);
}
}
// Draw margins
onDebugDrawMargins(canvas);
// Draw bounds
for (int i = 0; i < getChildCount(); i++) {
GLView c = getChildAt(i);
drawRect(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), Color.BLUE);
}*/
}
/**
* @hide
*/
protected void onDebugDrawMargins(GLCanvas canvas) {
for (int i = 0; i < getChildCount(); i++) {
View c = getChildAt(i);
c.getLayoutParams().onDebugDraw(c, canvas);
}
}
/**
* Return true if the pressed state should be delayed for children or descendants of this
* ViewGroup. Generally, this should be done for containers that can scroll, such as a List.
* This prevents the pressed state from appearing when the user is actually trying to scroll
* the content.
*
* The default implementation returns true for compatibility reasons. Subclasses that do
* not scroll should generally override this method and return false.
*/
public boolean shouldDelayChildPressedState() {
return true;
}
/**
* @inheritDoc
*/
public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
return false;
}
/**
* @inheritDoc
*/
public void onNestedScrollAccepted(View child, View target, int axes) {
mNestedScrollAxes = axes;
}
/**
* @inheritDoc
*
* <p>The default implementation of onStopNestedScroll calls
* {@link #stopNestedScroll()} to halt any recursive nested scrolling in progress.</p>
*/
public void onStopNestedScroll(View child) {
// Stop any recursive nested scrolling.
stopNestedScroll();
}
/**
* @inheritDoc
*/
public void onNestedScroll(View target, int dxConsumed, int dyConsumed,
int dxUnconsumed, int dyUnconsumed) {
// Do nothing
}
/**
* @inheritDoc
*/
public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
// Do nothing
}
/**
* @inheritDoc
*/
public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
return false;
}
/**
* @inheritDoc
*/
public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
return false;
}
/**
* Return the current axes of nested scrolling for this ViewGroup.
*
* <p>A ViewGroup returning something other than {@link #SCROLL_AXIS_NONE} is currently
* acting as a nested scrolling parent for one or more descendant views in the hierarchy.</p>
*
* @return Flags indicating the current axes of nested scrolling
* @see #SCROLL_AXIS_HORIZONTAL
* @see #SCROLL_AXIS_VERTICAL
* @see #SCROLL_AXIS_NONE
*/
public int getNestedScrollAxes() {
return mNestedScrollAxes;
}
/** @hide */
protected void onSetLayoutParams(View child, LayoutParams layoutParams) {}
public void requestChildFocus(View child, View focused) {
if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) {
return;
}
// Unfocus us, if necessary
super.unFocus();
// We had a previous notion of who had focus. Clear it.
if (mFocused != child) {
if (mFocused != null) {
mFocused.unFocus();
}
mFocused = child;
}
if (mParent != null) {
mParent.requestChildFocus(this, focused);
}
}
/**
* {@inheritDoc}
*/
public void focusableViewAvailable(View v) {
if (mParent != null
// shortcut: don't report a new focusable view if we block our descendants from
// getting focus
&& (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS)
// shortcut: don't report a new focusable view if we already are focused
// (and we don't prefer our descendants)
//
// note: knowing that mFocused is non-null is not a good enough reason
// to break the traversal since in that case we'd actually have to find
// the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and
// an ancestor of v; this will get checked for at ViewAncestor
&& !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) {
mParent.focusableViewAvailable(v);
}
}
@Override
void unFocus() {
if (mFocused == null) {
super.unFocus();
} else {
mFocused.unFocus();
mFocused = null;
}
}
protected void onViewAdded(View child) {
}
protected void onViewRemoved(View child) {
}
private void addInArray(View child, int index) {
View[] children = mChildren;
final int count = mChildrenCount;
final int size = children.length;
if (index == count) {
if (size == count) {
mChildren = new View[size + ARRAY_CAPACITY_INCREMENT];
System.arraycopy(children, 0, mChildren, 0, size);
children = mChildren;
}
children[mChildrenCount++] = child;
} else if (index < count) {
if (size == count) {
mChildren = new View[size + ARRAY_CAPACITY_INCREMENT];
System.arraycopy(children, 0, mChildren, 0, index);
System.arraycopy(children, index, mChildren, index + 1, count - index);
children = mChildren;
} else {
System.arraycopy(children, index, children, index + 1, count - index);
}
children[index] = child;
mChildrenCount++;
if (mLastTouchDownIndex >= index) {
mLastTouchDownIndex++;
}
} else {
throw new IndexOutOfBoundsException("index=" + index + " count=" + count);
}
}
/**
* Offset a rectangle that is in a descendant's coordinate
* space into our coordinate space.
* @param descendant A descendant of this view
* @param rect A rectangle defined in descendant's coordinate space.
*/
public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) {
offsetRectBetweenParentAndChild(descendant, rect, true, false);
}
/**
* Offset a rectangle that is in our coordinate space into an ancestor's
* coordinate space.
* @param descendant A descendant of this view
* @param rect A rectangle defined in descendant's coordinate space.
*/
public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) {
offsetRectBetweenParentAndChild(descendant, rect, false, false);
}
/**
* Helper method that offsets a rect either from parent to descendant or
* descendant to parent.
* descendant 后裔
*/
void offsetRectBetweenParentAndChild(View descendant, Rect rect,
boolean offsetFromChildToParent, boolean clipToBounds) {
// already in the same coord system :)
if (descendant == this) {
return;
}
ViewGroup theParent = descendant.mParent;
// search and offset up to the parent
while ((theParent != null)
&& (theParent instanceof View)
&& (theParent != this)) {
if (offsetFromChildToParent) {
rect.offset(descendant.mLeft - descendant.mScrollX,
descendant.mTop - descendant.mScrollY);
if (clipToBounds) {
View p = (View) theParent;
rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop);
}
} else {
if (clipToBounds) {
View p = (View) theParent;
rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop);
}
rect.offset(descendant.mScrollX - descendant.mLeft,
descendant.mScrollY - descendant.mTop);
}
descendant = (View) theParent;
theParent = descendant.mParent;
}
// now that we are up to this view, need to offset one more time
// to get into our coordinate space
if (theParent == this) {
if (offsetFromChildToParent) {
rect.offset(descendant.mLeft - descendant.mScrollX,
descendant.mTop - descendant.mScrollY);
} else {
rect.offset(descendant.mScrollX - descendant.mLeft,
descendant.mScrollY - descendant.mTop);
}
} else {
throw new IllegalArgumentException("parameter must be a descendant of this view");
}
}
/**
* Offset the vertical location of all children of this view by the specified number of pixels.
*
* @param offset the number of pixels to offset
*
* @hide
*/
public void offsetChildrenTopAndBottom(int offset) {
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
final View v = children[i];
v.offsetTopAndBottom(offset);
}
invalidate();
}
// This method also sets the child's mParent to null
private void removeFromArray(int index) {
final View[] children = mChildren;
if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) {
children[index].mParent = null;
}
final int count = mChildrenCount;
if (index == count - 1) {
children[--mChildrenCount] = null;
} else if (index >= 0 && index < count) {
System.arraycopy(children, index + 1, children, index, count - index - 1);
children[--mChildrenCount] = null;
} else {
throw new IndexOutOfBoundsException();
}
if (mLastTouchDownIndex == index) {
mLastTouchDownTime = 0;
mLastTouchDownIndex = -1;
} else if (mLastTouchDownIndex > index) {
mLastTouchDownIndex--;
}
}
// This method also sets the children's mParent to null
private void removeFromArray(int start, int count) {
final View[] children = mChildren;
final int childrenCount = mChildrenCount;
start = Math.max(0, start);
final int end = Math.min(childrenCount, start + count);
if (start == end) {
return;
}
if (end == childrenCount) {
for (int i = start; i < end; i++) {
children[i].mParent = null;
children[i] = null;
}
} else {
for (int i = start; i < end; i++) {
children[i].mParent = null;
}
// Since we're looping above, we might as well do the copy, but is arraycopy()
// faster than the extra 2 bounds checks we would do in the loop?
System.arraycopy(children, end, children, start, childrenCount - end);
for (int i = childrenCount - (end - start); i < childrenCount; i++) {
children[i] = null;
}
}
mChildrenCount -= (end - start);
}
public int getChildCount(){
return mChildrenCount;
}
public View getChildAt(int index) {
if (index < 0 || index >= mChildrenCount) {
return null;
}
return mChildren[index];
}
public void removeViewAt(int index){
if(index >= 0 && index < mChildrenCount){
removeViewInternal(index, getChildAt(index));
requestLayout();
invalidate(true);
}
}
public void removeView(View view){
removeViewInternal(view);
requestLayout();
invalidate(true);
}
/**
* Removes a view during layout. This is useful if in your onLayout() method,
* you need to remove more views.
*
* <p><strong>Note:</strong> do not invoke this method from
* {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
* {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
*
* @param view the view to remove from the group
*/
public void removeViewInLayout(View view) {
removeViewInternal(view);
}
/**
* Removes a range of views during layout. This is useful if in your onLayout() method,
* you need to remove more views.
*
* <p><strong>Note:</strong> do not invoke this method from
* {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
* {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
*
* @param start the index of the first view to remove from the group
* @param count the number of views to remove from the group
*/
public void removeViewsInLayout(int start, int count) {
removeViewsInternal(start, count);
}
private void removeViewInternal(View view) {
final int index = indexOfChild(view);
if (index >= 0) {
removeViewInternal(index, view);
}
}
private void removeViewInternal(int index, View child) {
//remove animation
if (mTransition != null) {
mTransition.removeChild(this, child);
}
boolean clearChildFocus = false;
if (child == mFocused) {
child.unFocus();
clearChildFocus = true;
}
cancelTouchTarget(child);
if (child.getAnimation() != null ||
(mTransitioningViews != null && mTransitioningViews.contains(child))) {
addDisappearingView(child);
} else if (child.mAttachInfo != null) {
child.dispatchDetachedFromWindow();
}
needGlobalAttributesUpdate(false);
removeFromArray(index);
if (clearChildFocus) {
clearChildFocus(child);
if (!rootViewRequestFocus()) {
notifyGlobalFocusCleared(this);
}
}
onViewRemoved(child);
}
/**
* Cleanup a view when its animation is done. This may mean removing it from
* the list of disappearing views.
*
* @param view The view whose animation has finished
* @param animation The animation, cannot be null
*/
void finishAnimatingView(final View view, Animation animation) {
final ArrayList<View> disappearingChildren = mDisappearingChildren;
if (disappearingChildren != null) {
if (disappearingChildren.contains(view)) {
disappearingChildren.remove(view);
onViewRemoved(view);
view.clearAnimation();
/*if (view.mAttachInfo != null) {
view.dispatchDetachedFromWindow();
}
view.clearAnimation();
mGroupFlags |= FLAG_INVALIDATE_REQUIRED;*/
}
}
if (animation != null && !animation.getFillAfter()) {
view.clearAnimation();
}
if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) {
view.onAnimationEnd();
// Should be performed by onAnimationEnd() but this avoid an infinite loop,
// so we'd rather be safe than sorry
view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED;
/*// Draw one more frame after the animation is done
mGroupFlags |= FLAG_INVALIDATE_REQUIRED;*/
}
}
/**
* Utility function called by View during invalidation to determine whether a view that
* is invisible or gone should still be invalidated because it is being transitioned (and
* therefore still needs to be drawn).
*/
boolean isViewTransitioning(View view) {
return (mTransitioningViews != null && mTransitioningViews.contains(view));
}
/**
* This method tells the ViewGroup that the given View object, which should have this
* ViewGroup as its parent,
* should be kept around (re-displayed when the ViewGroup draws its children) even if it
* is removed from its parent. This allows animations, such as those used by
* {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate
* the removal of views. A call to this method should always be accompanied by a later call
* to {@link #endViewTransition(View)}, such as after an animation on the View has finished,
* so that the View finally gets removed.
*
* @param view The View object to be kept visible even if it gets removed from its parent.
*/
public void startViewTransition(View view) {
if (view.mParent == this) {
if (mTransitioningViews == null) {
mTransitioningViews = new ArrayList<View>();
}
mTransitioningViews.add(view);
}
}
/**
* This method should always be called following an earlier call to
* {@link #startViewTransition(View)}. The given View is finally removed from its parent
* and will no longer be displayed. Note that this method does not perform the functionality
* of removing a view from its parent; it just discontinues the display of a View that
* has previously been removed.
*
* @return view The View object that has been removed but is being kept around in the visible
* hierarchy by an earlier call to {@link #startViewTransition(View)}.
*/
public void endViewTransition(View view) {
if (mTransitioningViews != null) {
mTransitioningViews.remove(view);
final ArrayList<View> disappearingChildren = mDisappearingChildren;
if (disappearingChildren != null && disappearingChildren.contains(view)) {
disappearingChildren.remove(view);
if (mVisibilityChangingChildren != null &&
mVisibilityChangingChildren.contains(view)) {
mVisibilityChangingChildren.remove(view);
} else {
onViewRemoved(view);
if (view.mParent != null) {
view.mParent = null;
}
}
invalidate();
}
}
}
/**
* Tells this ViewGroup to suppress all layout() calls until layout
* suppression is disabled with a later call to suppressLayout(false).
* When layout suppression is disabled, a requestLayout() call is sent
* if layout() was attempted while layout was being suppressed.
*
* @hide
*/
public void suppressLayout(boolean suppress) {
mSuppressLayout = suppress;
if (!suppress) {
if (mLayoutCalledWhileSuppressed) {
requestLayout();
mLayoutCalledWhileSuppressed = false;
}
}
}
/**
* Returns whether layout calls on this container are currently being
* suppressed, due to an earlier call to {@link #suppressLayout(boolean)}.
*
* @return true if layout calls are currently suppressed, false otherwise.
*
* @hide
*/
public boolean isLayoutSuppressed() {
return mSuppressLayout;
}
private LayoutTransition.TransitionListener mLayoutTransitionListener =
new LayoutTransition.TransitionListener() {
@Override
public void startTransition(LayoutTransition transition, ViewGroup container,
View view, int transitionType) {
// We only care about disappearing items, since we need special logic to keep
// those items visible after they've been 'removed'
if (transitionType == LayoutTransition.DISAPPEARING) {
startViewTransition(view);
}
}
@Override
public void endTransition(LayoutTransition transition, ViewGroup container,
View view, int transitionType) {
if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) {
requestLayout();
mLayoutCalledWhileSuppressed = false;
}
if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) {
endViewTransition(view);
}
}
};
/**
* Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is
* not null, changes in layout which occur because of children being added to or removed from
* the ViewGroup will be animated according to the animations defined in that LayoutTransition
* object. By default, the transition object is null (so layout changes are not animated).
*
* <p>Replacing a non-null transition will cause that previous transition to be
* canceled, if it is currently running, to restore this container to
* its correct post-transition state.</p>
*
* @param transition The LayoutTransition object that will animated changes in layout. A value
* of <code>null</code> means no transition will run on layout changes.
* @attr ref android.R.styleable#ViewGroup_animateLayoutChanges
*/
public void setLayoutTransition(LayoutTransition transition) {
if (mTransition != null) {
LayoutTransition previousTransition = mTransition;
previousTransition.cancel();
previousTransition.removeTransitionListener(mLayoutTransitionListener);
}
mTransition = transition;
if (mTransition != null) {
mTransition.addTransitionListener(mLayoutTransitionListener);
}
}
/**
* Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is
* not null, changes in layout which occur because of children being added to or removed from
* the ViewGroup will be animated according to the animations defined in that LayoutTransition
* object. By default, the transition object is null (so layout changes are not animated).
*
* @return LayoutTranstion The LayoutTransition object that will animated changes in layout.
* A value of <code>null</code> means no transition will run on layout changes.
*/
public LayoutTransition getLayoutTransition() {
return mTransition;
}
public void removeAllViewsInLayout() {
final int count = mChildrenCount;
if (count <= 0) {
return;
}
final View[] children = mChildren;
mChildrenCount = 0;
final View focused = mFocused;
final boolean detach = mAttachInfo != null;
View clearChildFocus = null;
needGlobalAttributesUpdate(false);
for (int i = count - 1; i >= 0; i--) {
final View view = children[i];
if (mTransition != null) {
mTransition.removeChild(this, view);
}
if (view == focused) {
view.unFocus();
clearChildFocus = view;
}
cancelTouchTarget(view);
if (view.getAnimation() != null ||
(mTransitioningViews != null && mTransitioningViews.contains(view))) {
addDisappearingView(view);
} else if (detach) {
view.dispatchDetachedFromWindow();
}
onViewRemoved(view);
view.mParent = null;
children[i] = null;
}
if (clearChildFocus != null) {
clearChildFocus(clearChildFocus);
if (!rootViewRequestFocus()) {
notifyGlobalFocusCleared(focused);
}
}
}
/**
* Finishes the removal of a detached view. This method will dispatch the detached from
* window event and notify the hierarchy change listener.
* <p>
* This method is intended to be lightweight and makes no assumptions about whether the
* parent or child should be redrawn. Proper use of this method will include also making
* any appropriate {@link #requestLayout()} or {@link #invalidate()} calls.
* For example, callers can {@link #post(Runnable) post} a {@link Runnable}
* which performs a {@link #requestLayout()} on the next frame, after all detach/remove
* calls are finished, causing layout to be run prior to redrawing the view hierarchy.
*
* @param child the child to be definitely removed from the view hierarchy
* @param animate if true and the view has an animation, the view is placed in the
* disappearing views list, otherwise, it is detached from the window
*
* @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)
* @see #detachAllViewsFromParent()
* @see #detachViewFromParent(View)
* @see #detachViewFromParent(int)
*/
protected void removeDetachedView(View child, boolean animate) {
if (mTransition != null) {
mTransition.removeChild(this, child);
}
if (child == mFocused) {
child.clearFocus();
}
// child.clearAccessibilityFocus();
cancelTouchTarget(child);
// cancelHoverTarget(child);
if ((animate && child.getAnimation() != null) ||
(mTransitioningViews != null && mTransitioningViews.contains(child))) {
addDisappearingView(child);
} else if (child.mAttachInfo != null) {
child.dispatchDetachedFromWindow();
}
/*if (child.hasTransientState()) {
childHasTransientStateChanged(child, false);
}*/
onViewRemoved(child);
}
/**
* Attaches a view to this view group. Attaching a view assigns this group as the parent,
* sets the layout parameters and puts the view in the list of children so that
* it can be retrieved by calling {@link #getChildAt(int)}.
* <p>
* This method is intended to be lightweight and makes no assumptions about whether the
* parent or child should be redrawn. Proper use of this method will include also making
* any appropriate {@link #requestLayout()} or {@link #invalidate()} calls.
* For example, callers can {@link #post(Runnable) post} a {@link Runnable}
* which performs a {@link #requestLayout()} on the next frame, after all detach/attach
* calls are finished, causing layout to be run prior to redrawing the view hierarchy.
* <p>
* This method should be called only for views which were detached from their parent.
*
* @param child the child to attach
* @param index the index at which the child should be attached
* @param params the layout parameters of the child
*
* @see #removeDetachedView(View, boolean)
* @see #detachAllViewsFromParent()
* @see #detachViewFromParent(View)
* @see #detachViewFromParent(int)
*/
protected void attachViewToParent(View child, int index, LayoutParams params) {
child.mLayoutParams = params;
if (index < 0) {
index = mChildrenCount;
}
addInArray(child, index);
child.mParent = this;
child.mPrivateFlags = (child.mPrivateFlags
& ~PFLAG_DRAWING_CACHE_VALID)
| PFLAG_INVALIDATED;
this.mPrivateFlags |= PFLAG_INVALIDATED;
if (child.hasFocus()) {
requestChildFocus(child, child.findFocus());
}
}
/**
* Detaches a view from its parent. Detaching a view should be followed
* either by a call to
* {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
* or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
* temporary; reattachment or removal should happen within the same drawing cycle as
* detachment. When a view is detached, its parent is null and cannot be retrieved by a
* call to {@link #getChildAt(int)}.
*
* @param child the child to detach
*
* @see #detachViewFromParent(int)
* @see #detachViewsFromParent(int, int)
* @see #detachAllViewsFromParent()
* @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)
* @see #removeDetachedView(View, boolean)
*/
protected void detachViewFromParent(View child) {
removeFromArray(indexOfChild(child));
}
/**
* Detaches a view from its parent. Detaching a view should be followed
* either by a call to
* {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
* or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
* temporary; reattachment or removal should happen within the same drawing cycle as
* detachment. When a view is detached, its parent is null and cannot be retrieved by a
* call to {@link #getChildAt(int)}.
*
* @param index the index of the child to detach
*
* @see #detachViewFromParent(View)
* @see #detachAllViewsFromParent()
* @see #detachViewsFromParent(int, int)
* @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)
* @see #removeDetachedView(View, boolean)
*/
protected void detachViewFromParent(int index) {
removeFromArray(index);
}
/**
* Detaches a range of views from their parents. Detaching a view should be followed
* either by a call to
* {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
* or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
* temporary; reattachment or removal should happen within the same drawing cycle as
* detachment. When a view is detached, its parent is null and cannot be retrieved by a
* call to {@link #getChildAt(int)}.
*
* @param start the first index of the childrend range to detach
* @param count the number of children to detach
*
* @see #detachViewFromParent(View)
* @see #detachViewFromParent(int)
* @see #detachAllViewsFromParent()
* @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)
* @see #removeDetachedView(View, boolean)
*/
protected void detachViewsFromParent(int start, int count) {
removeFromArray(start, count);
}
/**
* Detaches all views from the parent. Detaching a view should be followed
* either by a call to
* {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
* or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
* temporary; reattachment or removal should happen within the same drawing cycle as
* detachment. When a view is detached, its parent is null and cannot be retrieved by a
* call to {@link #getChildAt(int)}.
*
* @see #detachViewFromParent(View)
* @see #detachViewFromParent(int)
* @see #detachViewsFromParent(int, int)
* @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)
* @see #removeDetachedView(View, boolean)
*/
protected void detachAllViewsFromParent() {
final int count = mChildrenCount;
if (count <= 0) {
return;
}
final View[] children = mChildren;
mChildrenCount = 0;
for (int i = count - 1; i >= 0; i--) {
children[i].mParent = null;
children[i] = null;
}
}
/**
* Add a view which is removed from mChildren but still needs animation
*
* @param v View to add
*/
private void addDisappearingView(View v) {
ArrayList<View> disappearingChildren = mDisappearingChildren;
if (disappearingChildren == null) {
disappearingChildren = mDisappearingChildren = new ArrayList<View>();
}
disappearingChildren.add(v);
}
private void renderDisappearingChildren(GLCanvas canvas){
// Draw any disappearing views that have animations
if (mDisappearingChildren != null) {
final ArrayList<View> disappearingChildren = mDisappearingChildren;
final int disappearingCount = disappearingChildren.size() - 1;
// Go backwards -- we may delete as animations finish
for (int i = disappearingCount; i >= 0; i--) {
//draw disappearing gl views
drawChildInternal(canvas, disappearingChildren.get(i), 0);
}
}
}
private void removeViewsInternal(int start, int count) {
final View focused = mFocused;
final boolean detach = mAttachInfo != null;
boolean clearChildFocus = false;
final View[] children = mChildren;
final int end = start + count;
for (int i = start; i < end; i++) {
final View view = children[i];
if (mTransition != null) {
mTransition.removeChild(this, view);
}
if (view == focused) {
view.unFocus(null);
clearChildFocus = true;
}
cancelTouchTarget(view);
if (view.getAnimation() != null ||
(mTransitioningViews != null && mTransitioningViews.contains(view))) {
addDisappearingView(view);
} else if (detach) {
view.dispatchDetachedFromWindow();
}
if (view.hasTransientState()) {
childHasTransientStateChanged(view, false);
}
needGlobalAttributesUpdate(false);
onViewRemoved(view);
}
removeFromArray(start, count);
if (clearChildFocus) {
clearChildFocus(focused);
if (!rootViewRequestFocus()) {
notifyGlobalFocusCleared(focused);
}
}
}
public void removeAllViews(){
removeAllViewsInLayout();
requestLayout();
invalidate(true);
}
@Override
void dispatchAttachedToWindow(AttachInfo info, int visibility) {
mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW;
super.dispatchAttachedToWindow(info, visibility);
mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW;
for (int i = 0; i < mChildrenCount; ++i) {
final View child = mChildren[i];
child.dispatchAttachedToWindow(info,
visibility | (child.mViewFlags & VISIBILITY_MASK));
}
}
@Override
void dispatchDetachedFromWindow() {
// If we still have a touch target, we are still in the process of
// dispatching motion events to a child; we need to get rid of that
// child to avoid dispatching events to it after the window is torn
// down. To make sure we keep the child in a consistent state, we
// first send it an ACTION_CANCEL motion event.
cancelAndClearTouchTargets(null);
// In case view is detached while transition is running
mLayoutCalledWhileSuppressed = false;
for (int i = 0; i < mChildrenCount; ++i) {
mChildren[i].dispatchDetachedFromWindow();
}
super.dispatchDetachedFromWindow();
}
Rect mTmpClipRect = new Rect();
/**
* Private draw method.
*/
@Override
void pdraw(GLCanvas canvas) {
boolean clipChildren = getClipChildren();
if (clipChildren) {
canvas.save(GLCanvas.SAVE_FLAG_CLIP);
mTmpClipRect.set(0, 0, getWidth(), getHeight());
mTmpClipRect.offset(getScrollX(), getScrollY());
canvas.clipRect(mTmpClipRect);
}
super.pdraw(canvas);
if (clipChildren) {
canvas.restore();
}
}
@Override
protected void dispatchDraw(GLCanvas canvas) {
final int childrenCount = mChildrenCount;
final View[] children = mChildren;
int flags = mGroupFlags;
final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK;
if (clipToPadding) {
canvas.save(GLCanvas.SAVE_FLAG_CLIP);
canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop,
mScrollX + mRight - mLeft - mPaddingRight,
mScrollY + mBottom - mTop - mPaddingBottom);
}
// Build Z-Sort children.
final long drawingTime = getDrawingTime();
// Only use the preordered list if not HW accelerated, since the HW pipeline will do the
// draw reordering internally
final ArrayList<View> preorderedList = /*usingRenderNodeProperties
? null : */buildOrderedChildList();
final boolean customOrder = preorderedList == null
&& isChildrenDrawingOrderEnabled();
for (int i = 0; i < childrenCount; i++) {
int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i;
final View child = (preorderedList == null)
? children[childIndex] : preorderedList.get(childIndex);
if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) {
drawChild(canvas, child, drawingTime);
}
}
if (preorderedList != null) preorderedList.clear();
renderDisappearingChildren(canvas);
if (clipToPadding) {
canvas.restore();
}
}
/**
* Returns the ViewGroupOverlay for this view group, creating it if it does
* not yet exist. In addition to {@link ViewOverlay}'s support for drawables,
* {@link ViewGroupOverlay} allows views to be added to the overlay. These
* views, like overlay drawables, are visual-only; they do not receive input
* events and should not be used as anything other than a temporary
* representation of a view in a parent container, such as might be used
* by an animation effect.
*
* <p>Note: Overlays do not currently work correctly with {@link
* SurfaceView} or {@link TextureView}; contents in overlays for these
* types of views may not display correctly.</p>
*
* @return The ViewGroupOverlay object for this view.
* @see ViewGroupOverlay
*/
@Override
public ViewGroupOverlay getOverlay() {
if (mOverlay == null) {
mOverlay = new ViewGroupOverlay(mContext, this);
}
return (ViewGroupOverlay) mOverlay;
}
protected void drawChild(GLCanvas canvas, View component, long drawintTime) {
if (component.getVisibility() != View.VISIBLE
&& component.getAnimation() == null) return;
drawChildInternal(canvas, component, drawintTime);
}
private void drawChildInternal(GLCanvas canvas, View child, long drawintTime) {
child.dispatchRender(canvas);
}
/**
* Returns whether this group's children are clipped to their bounds before drawing.
* The default value is true.
* @see #setClipChildren(boolean)
*
* @return True if the group's children will be clipped to their bounds,
* false otherwise.
*/
public boolean getClipChildren() {
return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0);
}
/**
* By default, children are clipped to their bounds before drawing. This
* allows view groups to override this behavior for animations, etc.
*
* @param clipChildren true to clip children to their bounds,
* false otherwise
* @attr ref android.R.styleable#ViewGroup_clipChildren
*/
public void setClipChildren(boolean clipChildren) {
boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN;
if (clipChildren != previousValue) {
setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren);
invalidate(true);
}
}
/**
* By default, children are clipped to the padding of the ViewGroup. This
* allows view groups to override this behavior
*
* @param clipToPadding true to clip children to the padding of the
* group, false otherwise
* @attr ref android.R.styleable#ViewGroup_clipToPadding
*/
public void setClipToPadding(boolean clipToPadding) {
if (hasBooleanFlag(FLAG_CLIP_TO_PADDING) != clipToPadding) {
setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding);
invalidate(true);
}
}
/**
* Check if this ViewGroup is configured to clip child views to its padding.
*
* @return true if this ViewGroup clips children to its padding, false otherwise
*
* @attr ref android.R.styleable#ViewGroup_clipToPadding
*/
public boolean getClipToPadding() {
return hasBooleanFlag(FLAG_CLIP_TO_PADDING);
}
@Override
public void outOfRenderRect() {
final int childCount = mChildrenCount;
for(int i = 0; i < childCount; i++){
mChildren[i].outOfRenderRect();
}
}
@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
if (!isEnabled())
return false;
boolean handled = false;
final int action = ev.getAction();
final int actionMasked = action & MotionEvent.ACTION_MASK;
// Handle an initial down.
if (actionMasked == MotionEvent.ACTION_DOWN) {
// Throw away all previous state when starting a new touch gesture.
// The framework may have dropped the up or cancel event for the previous gesture
// due to an app switch, ANR, or some other state change.
cancelAndClearTouchTargets(ev);
resetTouchState();
}
// Check for interception.
final boolean intercepted;
if (actionMasked == MotionEvent.ACTION_DOWN
|| mFirstTouchTarget != null) {
final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0;
if (!disallowIntercept) {
intercepted = onInterceptTouchEvent(ev);
ev.setAction(action); // restore action in case it was changed
} else {
intercepted = false;
}
} else {
// There are no touch targets and this action is not an initial down
// so this view group continues to intercept touches.
intercepted = true;
}
// Check for cancelation.
final boolean canceled = resetCancelNextUpFlag(this)
|| actionMasked == MotionEvent.ACTION_CANCEL;
// Update list of touch targets for pointer down, if needed.
final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0;
TouchTarget newTouchTarget = null;
boolean alreadyDispatchedToNewTouchTarget = false;
if (!canceled && !intercepted) {
if (actionMasked == MotionEvent.ACTION_DOWN
|| (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN)
|| actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
final int actionIndex = ev.getActionIndex(); // always 0 for down
final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex)
: TouchTarget.ALL_POINTER_IDS;
// Clean up earlier touch targets for this pointer id in case they
// have become out of sync.
removePointersFromTouchTargets(idBitsToAssign);
final int childrenCount = mChildrenCount;
if (newTouchTarget == null && childrenCount != 0) {
final float x = ev.getX(actionIndex);
final float y = ev.getY(actionIndex);
// Find a child that can receive the event.
// Scan children from front to back.
final ArrayList<View> preorderedList = buildOrderedChildList();
final boolean customOrder = preorderedList == null
&& isChildrenDrawingOrderEnabled();
final View[] children = mChildren;
for (int i = childrenCount - 1; i >= 0; i--) {
final int childIndex = customOrder
? getChildDrawingOrder(childrenCount, i) : i;
final View child = (preorderedList == null)
? children[childIndex] : preorderedList.get(childIndex);
if (!canViewReceivePointerEvents(child)
|| !isTransformedTouchPointInView(x, y, child, null)) {
continue;
}
newTouchTarget = getTouchTarget(child);
if (newTouchTarget != null) {
// Child is already receiving touch within its bounds.
// Give it the new pointer in addition to the ones it is handling.
newTouchTarget.pointerIdBits |= idBitsToAssign;
break;
}
resetCancelNextUpFlag(child);
if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) {
// Child wants to receive touch within its bounds.
mLastTouchDownTime = ev.getDownTime();
if (preorderedList != null) {
// childIndex points into presorted list, find original index
for (int j = 0; j < childrenCount; j++) {
if (children[childIndex] == mChildren[j]) {
mLastTouchDownIndex = j;
break;
}
}
} else {
mLastTouchDownIndex = childIndex;
}
mLastTouchDownX = ev.getX();
mLastTouchDownY = ev.getY();
newTouchTarget = addTouchTarget(child, idBitsToAssign);
alreadyDispatchedToNewTouchTarget = true;
break;
}
}
if (preorderedList != null) preorderedList.clear();
}
if (newTouchTarget == null && mFirstTouchTarget != null) {
// Did not find a child to receive the event.
// Assign the pointer to the least recently added target.
newTouchTarget = mFirstTouchTarget;
while (newTouchTarget.next != null) {
newTouchTarget = newTouchTarget.next;
}
newTouchTarget.pointerIdBits |= idBitsToAssign;
}
}
}
// Dispatch to touch targets.
if (mFirstTouchTarget == null) {
// No touch targets so treat this as an ordinary view.
handled = dispatchTransformedTouchEvent(ev, canceled, null,
TouchTarget.ALL_POINTER_IDS);
} else {
// Dispatch to touch targets, excluding the new touch target if we already
// dispatched to it. Cancel touch targets if necessary.
TouchTarget predecessor = null;
TouchTarget target = mFirstTouchTarget;
while (target != null) {
final TouchTarget next = target.next;
if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) {
handled = true;
} else {
final boolean cancelChild = resetCancelNextUpFlag(target.child)
|| intercepted;
if (dispatchTransformedTouchEvent(ev, cancelChild,
target.child, target.pointerIdBits)) {
handled = true;
}
if (cancelChild) {
if (predecessor == null) {
mFirstTouchTarget = next;
} else {
predecessor.next = next;
}
target.recycle();
target = next;
continue;
}
}
predecessor = target;
target = next;
}
}
// Update list of touch targets for pointer up or cancel, if needed.
if (canceled
|| actionMasked == MotionEvent.ACTION_UP
|| actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
resetTouchState();
} else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) {
final int actionIndex = ev.getActionIndex();
final int idBitsToRemove = 1 << ev.getPointerId(actionIndex);
removePointersFromTouchTargets(idBitsToRemove);
}
return handled;
// int x = (int) ev.getX();
// int y = (int) ev.getY();
// int action = ev.getAction();
// if (action == MotionEvent.ACTION_DOWN) {
// // in the reverse rendering order
// int childCount = mChildrenCount;
// for (int i = childCount - 1; i >= 0; --i) {
// View component = mChildren[i];
// if (component.getVisibility() != View.VISIBLE)
// continue;
// if (component.onTouchEvent(ev, x, y, component, true)) {
// mMotionTarget = component;
// return true;
// }
// }
// }
// return super.dispatchTouchEvent(ev);
}
/**
* Enable or disable the splitting of MotionEvents to multiple children during touch event
* dispatch. This behavior is enabled by default for applications that target an
* SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer.
*
* <p>When this option is enabled MotionEvents may be split and dispatched to different child
* views depending on where each pointer initially went down. This allows for user interactions
* such as scrolling two panes of content independently, chording of buttons, and performing
* independent gestures on different pieces of content.
*
* @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple
* child views. <code>false</code> to only allow one child view to be the target of
* any MotionEvent received by this ViewGroup.
* @attr ref android.R.styleable#ViewGroup_splitMotionEvents
*/
public void setMotionEventSplittingEnabled(boolean split) {
// TODO Applications really shouldn't change this setting mid-touch event,
// but perhaps this should handle that case and send ACTION_CANCELs to any child views
// with gestures in progress when this is changed.
if (split) {
mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS;
} else {
mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS;
}
}
/**
* Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children.
* @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children.
*/
public boolean isMotionEventSplittingEnabled() {
return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS;
}
/**
* Resets all touch state in preparation for a new cycle.
*/
private void resetTouchState() {
clearTouchTargets();
resetCancelNextUpFlag(this);
mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT;
mNestedScrollAxes = SCROLL_AXIS_NONE;
}
/**
* Resets the cancel next up flag.
* Returns true if the flag was previously set.
*/
private static boolean resetCancelNextUpFlag(View view) {
if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) {
view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT;
return true;
}
return false;
}
/**
* Clears all touch targets.
*/
private void clearTouchTargets() {
TouchTarget target = mFirstTouchTarget;
if (target != null) {
do {
TouchTarget next = target.next;
target.recycle();
target = next;
} while (target != null);
mFirstTouchTarget = null;
}
}
/**
* Cancels and clears all touch targets.
*/
private void cancelAndClearTouchTargets(MotionEvent event) {
if (mFirstTouchTarget != null) {
boolean syntheticEvent = false;
if (event == null) {
final long now = SystemClock.uptimeMillis();
event = MotionEvent.obtain(now, now,
MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0);
event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
syntheticEvent = true;
}
for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) {
resetCancelNextUpFlag(target.child);
dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits);
}
clearTouchTargets();
if (syntheticEvent) {
event.recycle();
}
}
}
/**
* Gets the touch target for specified child view.
* Returns null if not found.
*/
private TouchTarget getTouchTarget(View child) {
for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) {
if (target.child == child) {
return target;
}
}
return null;
}
/**
* Adds a touch target for specified child to the beginning of the list.
* Assumes the target child is not already present.
*/
private TouchTarget addTouchTarget(View child, int pointerIdBits) {
TouchTarget target = TouchTarget.obtain(child, pointerIdBits);
target.next = mFirstTouchTarget;
mFirstTouchTarget = target;
return target;
}
/**
* Removes the pointer ids from consideration.
*/
private void removePointersFromTouchTargets(int pointerIdBits) {
TouchTarget predecessor = null;
TouchTarget target = mFirstTouchTarget;
while (target != null) {
final TouchTarget next = target.next;
if ((target.pointerIdBits & pointerIdBits) != 0) {
target.pointerIdBits &= ~pointerIdBits;
if (target.pointerIdBits == 0) {
if (predecessor == null) {
mFirstTouchTarget = next;
} else {
predecessor.next = next;
}
target.recycle();
target = next;
continue;
}
}
predecessor = target;
target = next;
}
}
private void cancelTouchTarget(View view) {
TouchTarget predecessor = null;
TouchTarget target = mFirstTouchTarget;
while (target != null) {
final TouchTarget next = target.next;
if (target.child == view) {
if (predecessor == null) {
mFirstTouchTarget = next;
} else {
predecessor.next = next;
}
target.recycle();
final long now = SystemClock.uptimeMillis();
MotionEvent event = MotionEvent.obtain(now, now,
MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0);
event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
view.dispatchTouchEvent(event);
event.recycle();
return;
}
predecessor = target;
target = next;
}
}
/**
* Returns true if a child view can receive pointer events.
* @hide
*/
private static boolean canViewReceivePointerEvents(View child) {
return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE
|| child.getAnimation() != null;
}
/**
* Returns true if a child view contains the specified point when transformed
* into its coordinate space.
* Child must not be null.
* @hide
*/
protected boolean isTransformedTouchPointInView(float x, float y, View child,
PointF outLocalPoint) {
float localX = x + mScrollX - child.mLeft;
float localY = y + mScrollY - child.mTop;
final boolean isInView = child.pointInView(localX, localY);
if (isInView && outLocalPoint != null) {
outLocalPoint.set(localX, localY);
}
return isInView;
}
/**
* Transforms a motion event into the coordinate space of a particular child view,
* filters out irrelevant pointer ids, and overrides its action if necessary.
* If child is null, assumes the MotionEvent will be sent to this ViewGroup instead.
*/
private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel,
View child, int desiredPointerIdBits) {
final boolean handled;
// Canceling motions is a special case. We don't need to perform any transformations
// or filtering. The important part is the action, not the contents.
final int oldAction = event.getAction();
if (cancel || oldAction == MotionEvent.ACTION_CANCEL) {
event.setAction(MotionEvent.ACTION_CANCEL);
if (child == null) {
handled = super.dispatchTouchEvent(event);
} else {
handled = child.dispatchTouchEvent(event);
}
event.setAction(oldAction);
return handled;
}
if (child == null) {
handled = super.dispatchTouchEvent(event);
} else {
final float offsetX = mScrollX - child.mLeft;
final float offsetY = mScrollY - child.mTop;
event.offsetLocation(offsetX, offsetY);
handled = child.dispatchTouchEvent(event);
event.offsetLocation(-offsetX, -offsetY);
}
return handled;
}
/* Describes a touched view and the ids of the pointers that it has captured.
*
* This code assumes that pointer ids are always in the range 0..31 such that
* it can use a bitfield to track which pointer ids are present.
* As it happens, the lower layers of the input dispatch pipeline also use the
* same trick so the assumption should be safe here...
*/
private static final class TouchTarget {
private static final int MAX_RECYCLED = 32;
private static final Object sRecycleLock = new Object[0];
private static TouchTarget sRecycleBin;
private static int sRecycledCount;
public static final int ALL_POINTER_IDS = -1; // all ones
// The touched child view.
public View child;
// The combined bit mask of pointer ids for all pointers captured by the target.
public int pointerIdBits;
// The next target in the target list.
public TouchTarget next;
private TouchTarget() {
}
public static TouchTarget obtain(View child, int pointerIdBits) {
final TouchTarget target;
synchronized (sRecycleLock) {
if (sRecycleBin == null) {
target = new TouchTarget();
} else {
target = sRecycleBin;
sRecycleBin = target.next;
sRecycledCount--;
target.next = null;
}
}
target.child = child;
target.pointerIdBits = pointerIdBits;
return target;
}
public void recycle() {
synchronized (sRecycleLock) {
if (sRecycledCount < MAX_RECYCLED) {
next = sRecycleBin;
sRecycleBin = this;
sRecycledCount += 1;
} else {
next = null;
}
child = null;
}
}
}
/**
* {@inheritDoc}
*/
public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) {
// We're already in this state, assume our ancestors are too
return;
}
if (disallowIntercept) {
mGroupFlags |= FLAG_DISALLOW_INTERCEPT;
} else {
mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT;
}
// Pass it up to our parent
if (mParent != null) {
mParent.requestDisallowInterceptTouchEvent(disallowIntercept);
}
}
/**
* Implement this method to intercept all touch screen motion events. This
* allows you to watch events as they are dispatched to your children, and
* take ownership of the current gesture at any point.
*
* <p>Using this function takes some care, as it has a fairly complicated
* interaction with {@link View#onTouchEvent(MotionEvent)
* View.onTouchEvent(MotionEvent)}, and using it requires implementing
* that method as well as this one in the correct way. Events will be
* received in the following order:
*
* <ol>
* <li> You will receive the down event here.
* <li> The down event will be handled either by a child of this view
* group, or given to your own onTouchEvent() method to handle; this means
* you should implement onTouchEvent() to return true, so you will
* continue to see the rest of the gesture (instead of looking for
* a parent view to handle it). Also, by returning true from
* onTouchEvent(), you will not receive any following
* events in onInterceptTouchEvent() and all touch processing must
* happen in onTouchEvent() like normal.
* <li> For as long as you return false from this function, each following
* event (up to and including the final up) will be delivered first here
* and then to the target's onTouchEvent().
* <li> If you return true from here, you will not receive any
* following events: the target view will receive the same event but
* with the action {@link MotionEvent#ACTION_CANCEL}, and all further
* events will be delivered to your onTouchEvent() method and no longer
* appear here.
* </ol>
*
* @param ev The motion event being dispatched down the hierarchy.
* @return Return true to steal motion events from the children and have
* them dispatched to this ViewGroup through onTouchEvent().
* The current target will receive an ACTION_CANCEL event, and no further
* messages will be delivered here.
*/
public boolean onInterceptTouchEvent(MotionEvent ev) {
return false;
}
@Override
public void dispatchWindowSystemUiVisiblityChanged(int visible) {
super.dispatchWindowSystemUiVisiblityChanged(visible);
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i=0; i <count; i++) {
final View child = children[i];
child.dispatchWindowSystemUiVisiblityChanged(visible);
}
}
@Override
public void dispatchSystemUiVisibilityChanged(int visible) {
super.dispatchSystemUiVisibilityChanged(visible);
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i=0; i <count; i++) {
final View child = children[i];
child.dispatchSystemUiVisibilityChanged(visible);
}
}
@Override
boolean updateLocalSystemUiVisibility(int localValue, int localChanges) {
boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges);
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i=0; i <count; i++) {
final View child = children[i];
changed |= child.updateLocalSystemUiVisibility(localValue, localChanges);
}
return changed;
}
/**
* {@inheritDoc}
*/
public void recomputeViewAttributes(View child) {
if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
ViewGroup parent = mParent;
if (parent != null) parent.recomputeViewAttributes(this);
else if (mAttachInfo != null) getViewRootImpl().recomputeViewAttributes(this);
}
}
@Override
void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) {
if ((visibility & VISIBILITY_MASK) == VISIBLE) {
super.dispatchCollectViewAttributes(attachInfo, visibility);
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
final View child = children[i];
child.dispatchCollectViewAttributes(attachInfo,
visibility | (child.mViewFlags&VISIBILITY_MASK));
}
}
}
@Override
public boolean dispatchKeyEvent(KeyEvent event) {
if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
== (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
if (super.dispatchKeyEvent(event)) {
return true;
}
} else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
== PFLAG_HAS_BOUNDS) {
if (mFocused.dispatchKeyEvent(event)) {
return true;
}
}
return false;
}
/*
* (non-Javadoc)
*
* @see android.view.View#findFocus()
*/
@Override
public View findFocus() {
if (isFocused()) {
return this;
}
if (mFocused != null) {
return mFocused.findFocus();
}
return null;
}
/**
* Find the nearest view in the specified direction that wants to take
* focus.
*
* @param focused The view that currently has focus
* @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and
* FOCUS_RIGHT, or 0 for not applicable.
*/
public View focusSearch(View focused, int direction) {
if (isRootNamespace()) {
// root namespace means we should consider ourselves the top of the
// tree for focus searching; otherwise we could be focus searching
// into other tabs. see LocalActivityManager and TabHost for more info
return FocusFinder.getInstance().findNextFocus(this, focused, direction);
} else
if (mParent != null) {
return mParent.focusSearch(focused, direction);
}
return null;
}
/**
* {@inheritDoc}
*/
public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
return false;
}
/**
* 查找该layout中第一个有focusable的子孙控件，会判断是否控件的VISIBLE状态
* @return
*/
public View findFirstFocusableChild(){
View focusableChild = null;
if(getVisibility() == View.VISIBLE && mChildrenCount > 0){
for(View child : mChildren){
if(child != null && child.getVisibility() == View.VISIBLE){
if(child instanceof ViewGroup){
focusableChild = ((ViewGroup)child).findFirstFocusableChild();
if(focusableChild == null && child.isFocusable()){
focusableChild = child;
}
} else if(child != null){
focusableChild = child.isFocusable() ? child : null;
}
if(focusableChild != null){
break;
}
}
}
}
return focusableChild;
}
/**
* Returns the focused child of this view, if any. The child may have focus
* or contain focus.
*
* @return the focused child or null.
*/
public View getFocusedChild() {
return mFocused;
}
/**
* Returns true if this view has or contains focus
*
* @return true if this view has or contains focus
*/
@Override
public boolean hasFocus() {
return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null;
}
/**
* 查询是否有 focusable child
* @return
*/
public boolean hasFocusable() {
if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) {
return false;
}
if (isFocusable()) {
return true;
}
final int descendantFocusability = getDescendantFocusability();
if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) {
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
final View child = children[i];
if (child.hasFocusable()) {
return true;
}
}
}
return false;
}
/**
* Called when a child view has changed whether or not it is tracking transient state.
*/
public void childHasTransientStateChanged(View child, boolean childHasTransientState) {
final boolean oldHasTransientState = hasTransientState();
if (childHasTransientState) {
mChildCountWithTransientState++;
} else {
mChildCountWithTransientState--;
}
final boolean newHasTransientState = hasTransientState();
if (mParent != null && oldHasTransientState != newHasTransientState) {
try {
mParent.childHasTransientStateChanged(this, newHasTransientState);
} catch (AbstractMethodError e) {
Log.e(TAG, mParent.getClass().getSimpleName() +
" does not fully implement ViewParent", e);
}
}
}
@Override
public boolean hasTransientState() {
return mChildCountWithTransientState > 0 || super.hasTransientState();
}
/**
* {@inheritDoc}
*/
public void clearChildFocus(View child) {
mFocused = null;
if (mParent != null) {
mParent.clearChildFocus(this);
}
}
/**
* {@inheritDoc}
*/
@Override
public void dispatchWindowFocusChanged(boolean hasFocus) {
super.dispatchWindowFocusChanged(hasFocus);
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
children[i].dispatchWindowFocusChanged(hasFocus);
}
}
/**
* {@inheritDoc}
*/
@Override
public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
final int focusableCount = views.size();
super.addFocusables(views, direction, focusableMode);
final int descendantFocusability = getDescendantFocusability();
if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) {
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
final View child = children[i];
if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
child.addFocusables(views, direction, focusableMode);
}
}
}
// we add ourselves (if focusable) in all cases except for when we are
// FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is
// to avoid the focus search finding layouts when a more precise search
// among the focusable children would be more interesting.
if (descendantFocusability != FOCUS_AFTER_DESCENDANTS
// No focusable descendants
|| (focusableCount == views.size())) {
super.addFocusables(views, direction, focusableMode);
}
}
/**
* Gets the descendant focusability of this view group. The descendant
* focusability defines the relationship between this view group and its
* descendants when looking for a view to take focus in
* {@link #requestFocus(int, android.graphics.Rect)}.
*
* @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS},
* {@link #FOCUS_BLOCK_DESCENDANTS}.
*/
public int getDescendantFocusability() {
return mGroupFlags & FLAG_MASK_FOCUSABILITY;
}
/**
* Set the descendant focusability of this view group. This defines the relationship
* between this view group and its descendants when looking for a view to
* take focus in {@link #requestFocus(int, android.graphics.Rect)}.
*
* @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS},
* {@link #FOCUS_BLOCK_DESCENDANTS}.
*/
public void setDescendantFocusability(int focusability) {
switch (focusability) {
case FOCUS_BEFORE_DESCENDANTS:
case FOCUS_AFTER_DESCENDANTS:
case FOCUS_BLOCK_DESCENDANTS:
break;
default:
throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, "
+ "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS");
}
mGroupFlags &= ~FLAG_MASK_FOCUSABILITY;
mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY);
}
/**
* {@inheritDoc}
*/
@Override
void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) {
if (mFocused != null) {
mFocused.unFocus();
mFocused = null;
}
super.handleFocusGainInternal(direction, previouslyFocusedRect);
}
@Override
public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
int descendantFocusability = getDescendantFocusability();
switch (descendantFocusability) {
case FOCUS_BLOCK_DESCENDANTS:
return super.requestFocus(direction, previouslyFocusedRect);
case FOCUS_BEFORE_DESCENDANTS: {
final boolean took = super.requestFocus(direction, previouslyFocusedRect);
return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect);
}
case FOCUS_AFTER_DESCENDANTS: {
final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect);
return took ? took : super.requestFocus(direction, previouslyFocusedRect);
}
default:
throw new IllegalStateException("descendant focusability must be "
+ "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS "
+ "but is " + descendantFocusability);
}
}
/**
* Look for a descendant to call {@link View#requestFocus} on.
* Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)}
* when it wants to request focus within its children. Override this to
* customize how your {@link ViewGroup} requests focus within its children.
* @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT
* @param previouslyFocusedRect The rectangle (in this View's coordinate system)
* to give a finer grained hint about where focus is coming from. May be null
* if there is no hint.
* @return Whether focus was taken.
*/
protected boolean onRequestFocusInDescendants(int direction,
Rect previouslyFocusedRect) {
return onRequestFocusInDescendants(direction, previouslyFocusedRect, 0);
}
protected boolean onRequestFocusInDescendants(int direction,
Rect previouslyFocusedRect, int startIndex){
int index = startIndex;
int increment;
int end;
int count = mChildrenCount;
if ((direction & FOCUS_FORWARD) != 0) {
index = startIndex;
increment = 1;
end = count;
} else {
index = count - 1;
increment = -1;
end = -1;
}
final View[] children = mChildren;
for (int i = index; i != end; i += increment) {
View child = children[i];
if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
if (child.requestFocus(direction, previouslyFocusedRect)) {
return true;
}
}
}
return false;
}
/**
* LayoutParams are used by views to tell their parents how they want to be
* laid out. See
* {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes}
* for a list of all child view attributes that this class supports.
*
* <p>
* The base LayoutParams class just describes how big the view wants to be
* for both width and height. For each dimension, it can specify one of:
* <ul>
* <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which
* means that the view wants to be as big as its parent (minus padding)
* <li> WRAP_CONTENT, which means that the view wants to be just big enough
* to enclose its content (plus padding)
* <li> an exact number
* </ul>
* There are subclasses of LayoutParams for different subclasses of
* ViewGroup. For example, AbsoluteLayout has its own subclass of
* LayoutParams which adds an X and Y value.</p>
*
* <div class="special reference">
* <h3>Developer Guides</h3>
* <p>For more information about creating user interface layouts, read the
* <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer
* guide.</p></div>
*
* @attr ref android.R.styleable#ViewGroup_Layout_layout_height
* @attr ref android.R.styleable#ViewGroup_Layout_layout_width
*/
public static class LayoutParams {
/**
* Special value for the height or width requested by a View.
* FILL_PARENT means that the view wants to be as big as its parent,
* minus the parent's padding, if any. This value is deprecated
* starting in API Level 8 and replaced by {@link #MATCH_PARENT}.
*/
@SuppressWarnings({"UnusedDeclaration"})
@Deprecated
public static final int FILL_PARENT = -1;
/**
* Special value for the height or width requested by a View.
* MATCH_PARENT means that the view wants to be as big as its parent,
* minus the parent's padding, if any. Introduced in API Level 8.
*/
public static final int MATCH_PARENT = -1;
/**
* Special value for the height or width requested by a View.
* WRAP_CONTENT means that the view wants to be just large enough to fit
* its own internal content, taking its own padding into account.
*/
public static final int WRAP_CONTENT = -2;
/**
* Information about how wide the view wants to be. Can be one of the
* constants FILL_PARENT (replaced by MATCH_PARENT ,
* in API Level 8) or WRAP_CONTENT. or an exact size.
*/
public int width;
/**
* Information about how tall the view wants to be. Can be one of the
* constants FILL_PARENT (replaced by MATCH_PARENT ,
* in API Level 8) or WRAP_CONTENT. or an exact size.
*/
public int height;
/**
* Used to animate layouts.
*/
public LayoutAnimationController.AnimationParameters layoutAnimationParameters;
/**
* Creates a new set of layout parameters. The values are extracted from
* the supplied attributes set and context. The XML attributes mapped
* to this set of layout parameters are:
*
* <ul>
* <li><code>layout_width</code>: the width, either an exact value,
* {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by
* {@link #MATCH_PARENT} in API Level 8)</li>
* <li><code>layout_height</code>: the height, either an exact value,
* {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by
* {@link #MATCH_PARENT} in API Level 8)</li>
* </ul>
*
* @param c the application environment
* @param attrs the set of attributes from which to extract the layout
* parameters' values
*/
public LayoutParams(Context c, AttributeSet attrs) {
TypedArray a = c.obtainStyledAttributes(attrs, com.glview.R.styleable.ViewGroup_Layout);
setBaseAttributes(a,
com.glview.R.styleable.ViewGroup_Layout_layout_width,
com.glview.R.styleable.ViewGroup_Layout_layout_height);
a.recycle();
}
/**
* Creates a new set of layout parameters with the specified width
* and height.
*
* @param width the width, either {@link #WRAP_CONTENT},
* {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in
* API Level 8), or a fixed size in pixels
* @param height the height, either {@link #WRAP_CONTENT},
* {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in
* API Level 8), or a fixed size in pixels
*/
public LayoutParams(int width, int height) {
this.width = width;
this.height = height;
}
/**
* Copy constructor. Clones the width and height values of the source.
*
* @param source The layout params to copy from.
*/
public LayoutParams(LayoutParams source) {
this.width = source.width;
this.height = source.height;
}
/**
* Used internally by MarginLayoutParams.
* @hide
*/
LayoutParams() {
}
/**
* Extracts the layout parameters from the supplied attributes.
*
* @param a the style attributes to extract the parameters from
* @param widthAttr the identifier of the width attribute
* @param heightAttr the identifier of the height attribute
*/
protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) {
width = a.getLayoutDimension(widthAttr, "layout_width");
height = a.getLayoutDimension(heightAttr, "layout_height");
}
/**
* Resolve layout parameters depending on the layout direction. Subclasses that care about
* layoutDirection changes should override this method. The default implementation does
* nothing.
*
* @param layoutDirection the direction of the layout
*
* {@link View#LAYOUT_DIRECTION_LTR}
* {@link View#LAYOUT_DIRECTION_RTL}
*/
public void resolveLayoutDirection(int layoutDirection) {
}
/**
* Returns a String representation of this set of layout parameters.
*
* @param output the String to prepend to the internal representation
* @return a String with the following format: output +
* "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }"
*
* @hide
*/
public String debug(String output) {
return output + "ViewGroup.LayoutParams={ width="
+ sizeToString(width) + ", height=" + sizeToString(height) + " }";
}
/**
* Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters.
*
* @param view the view that contains these layout parameters
* @param canvas the canvas on which to draw
*
* @hide
*/
public void onDebugDraw(View view, GLCanvas canvas) {
}
/**
* Converts the specified size to a readable String.
*
* @param size the size to convert
* @return a String instance representing the supplied size
*
* @hide
*/
protected static String sizeToString(int size) {
if (size == WRAP_CONTENT) {
return "wrap-content";
}
if (size == MATCH_PARENT) {
return "match-parent";
}
return String.valueOf(size);
}
}
/**
* Per-child layout information for layouts that support margins.
* See
* {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes}
* for a list of all child view attributes that this class supports.
*/
public static class MarginLayoutParams extends ViewGroup.LayoutParams {
/**
* The left margin in pixels of the child.
* Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
* to this field.
*/
public int leftMargin;
/**
* The top margin in pixels of the child.
* Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
* to this field.
*/
public int topMargin;
/**
* The right margin in pixels of the child.
* Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
* to this field.
*/
public int rightMargin;
/**
* The bottom margin in pixels of the child.
* Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
* to this field.
*/
public int bottomMargin;
/**
* The start margin in pixels of the child.
* Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
* to this field.
*/
private int startMargin = DEFAULT_MARGIN_RELATIVE;
/**
* The end margin in pixels of the child.
* Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
* to this field.
*/
private int endMargin = DEFAULT_MARGIN_RELATIVE;
/**
* The default start and end margin.
* @hide
*/
public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE;
/**
* Bit 0: layout direction
* Bit 1: layout direction
* Bit 2: left margin undefined
* Bit 3: right margin undefined
* Bit 4: is RTL compatibility mode
* Bit 5: need resolution
*
* Bit 6 to 7 not used
*
* @hide
*/
byte mMarginFlags;
private static final int LAYOUT_DIRECTION_MASK = 0x00000003;
private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004;
private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008;
private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010;
private static final int NEED_RESOLUTION_MASK = 0x00000020;
private static final int DEFAULT_MARGIN_RESOLVED = 0;
private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE;
/**
* Creates a new set of layout parameters. The values are extracted from
* the supplied attributes set and context.
*
* @param c the application environment
* @param attrs the set of attributes from which to extract the layout
* parameters' values
*/
public MarginLayoutParams(Context c, AttributeSet attrs) {
super();
TypedArray a = c.obtainStyledAttributes(attrs, com.glview.R.styleable.ViewGroup_MarginLayout);
setBaseAttributes(a,
com.glview.R.styleable.ViewGroup_MarginLayout_layout_width,
com.glview.R.styleable.ViewGroup_MarginLayout_layout_height);
int margin = a.getDimensionPixelSize(
com.glview.R.styleable.ViewGroup_MarginLayout_layout_margin, -1);
if (margin >= 0) {
leftMargin = margin;
topMargin = margin;
rightMargin= margin;
bottomMargin = margin;
} else {
leftMargin = a.getDimensionPixelSize(
com.glview.R.styleable.ViewGroup_MarginLayout_layout_marginLeft,
UNDEFINED_MARGIN);
if (leftMargin == UNDEFINED_MARGIN) {
mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK;
leftMargin = DEFAULT_MARGIN_RESOLVED;
}
rightMargin = a.getDimensionPixelSize(
com.glview.R.styleable.ViewGroup_MarginLayout_layout_marginRight,
UNDEFINED_MARGIN);
if (rightMargin == UNDEFINED_MARGIN) {
mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK;
rightMargin = DEFAULT_MARGIN_RESOLVED;
}
topMargin = a.getDimensionPixelSize(
com.glview.R.styleable.ViewGroup_MarginLayout_layout_marginTop,
DEFAULT_MARGIN_RESOLVED);
bottomMargin = a.getDimensionPixelSize(
com.glview.R.styleable.ViewGroup_MarginLayout_layout_marginBottom,
DEFAULT_MARGIN_RESOLVED);
startMargin = a.getDimensionPixelSize(
com.glview.R.styleable.ViewGroup_MarginLayout_layout_marginStart,
DEFAULT_MARGIN_RELATIVE);
endMargin = a.getDimensionPixelSize(
com.glview.R.styleable.ViewGroup_MarginLayout_layout_marginEnd,
DEFAULT_MARGIN_RELATIVE);
if (isMarginRelative()) {
mMarginFlags |= NEED_RESOLUTION_MASK;
}
}
final boolean hasRtlSupport = true;
// Layout direction is LTR by default
mMarginFlags |= LAYOUT_DIRECTION_LTR;
a.recycle();
}
/**
* {@inheritDoc}
*/
public MarginLayoutParams(int width, int height) {
super(width, height);
mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK;
mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK;
mMarginFlags &= ~NEED_RESOLUTION_MASK;
mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK;
}
/**
* Copy constructor. Clones the width, height and margin values of the source.
*
* @param source The layout params to copy from.
*/
public MarginLayoutParams(MarginLayoutParams source) {
this.width = source.width;
this.height = source.height;
this.leftMargin = source.leftMargin;
this.topMargin = source.topMargin;
this.rightMargin = source.rightMargin;
this.bottomMargin = source.bottomMargin;
this.startMargin = source.startMargin;
this.endMargin = source.endMargin;
this.mMarginFlags = source.mMarginFlags;
}
/**
* {@inheritDoc}
*/
public MarginLayoutParams(LayoutParams source) {
super(source);
mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK;
mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK;
mMarginFlags &= ~NEED_RESOLUTION_MASK;
mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK;
}
/**
* @hide Used internally.
*/
public final void copyMarginsFrom(MarginLayoutParams source) {
this.leftMargin = source.leftMargin;
this.topMargin = source.topMargin;
this.rightMargin = source.rightMargin;
this.bottomMargin = source.bottomMargin;
this.startMargin = source.startMargin;
this.endMargin = source.endMargin;
this.mMarginFlags = source.mMarginFlags;
}
/**
* Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs
* to be done so that the new margins are taken into account. Left and right margins may be
* overriden by {@link android.view.View#requestLayout()} depending on layout direction.
*
* @param left the left margin size
* @param top the top margin size
* @param right the right margin size
* @param bottom the bottom margin size
*
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom
*/
public void setMargins(int left, int top, int right, int bottom) {
leftMargin = left;
topMargin = top;
rightMargin = right;
bottomMargin = bottom;
mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK;
mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK;
if (isMarginRelative()) {
mMarginFlags |= NEED_RESOLUTION_MASK;
} else {
mMarginFlags &= ~NEED_RESOLUTION_MASK;
}
}
/**
* Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()}
* needs to be done so that the new relative margins are taken into account. Left and right
* margins may be overriden by {@link android.view.View#requestLayout()} depending on layout
* direction.
*
* @param start the start margin size
* @param top the top margin size
* @param end the right margin size
* @param bottom the bottom margin size
*
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom
*
* @hide
*/
public void setMarginsRelative(int start, int top, int end, int bottom) {
startMargin = start;
topMargin = top;
endMargin = end;
bottomMargin = bottom;
mMarginFlags |= NEED_RESOLUTION_MASK;
}
/**
* Sets the relative start margin.
*
* @param start the start margin size
*
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart
*/
public void setMarginStart(int start) {
startMargin = start;
mMarginFlags |= NEED_RESOLUTION_MASK;
}
/**
* Returns the start margin in pixels.
*
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart
*
* @return the start margin in pixels.
*/
public int getMarginStart() {
if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin;
if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) {
doResolveMargins();
}
switch(mMarginFlags & LAYOUT_DIRECTION_MASK) {
case View.LAYOUT_DIRECTION_RTL:
return rightMargin;
case View.LAYOUT_DIRECTION_LTR:
default:
return leftMargin;
}
}
/**
* Sets the relative end margin.
*
* @param end the end margin size
*
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd
*/
public void setMarginEnd(int end) {
endMargin = end;
mMarginFlags |= NEED_RESOLUTION_MASK;
}
/**
* Returns the end margin in pixels.
*
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd
*
* @return the end margin in pixels.
*/
public int getMarginEnd() {
if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin;
if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) {
doResolveMargins();
}
switch(mMarginFlags & LAYOUT_DIRECTION_MASK) {
case View.LAYOUT_DIRECTION_RTL:
return leftMargin;
case View.LAYOUT_DIRECTION_LTR:
default:
return rightMargin;
}
}
/**
* Check if margins are relative.
*
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart
* @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd
*
* @return true if either marginStart or marginEnd has been set.
*/
public boolean isMarginRelative() {
return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE);
}
/**
* Set the layout direction
* @param layoutDirection the layout direction.
* Should be either {@link View#LAYOUT_DIRECTION_LTR}
* or {@link View#LAYOUT_DIRECTION_RTL}.
*/
public void setLayoutDirection(int layoutDirection) {
if (layoutDirection != View.LAYOUT_DIRECTION_LTR &&
layoutDirection != View.LAYOUT_DIRECTION_RTL) return;
if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) {
mMarginFlags &= ~LAYOUT_DIRECTION_MASK;
mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK);
if (isMarginRelative()) {
mMarginFlags |= NEED_RESOLUTION_MASK;
} else {
mMarginFlags &= ~NEED_RESOLUTION_MASK;
}
}
}
/**
* Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or
* {@link View#LAYOUT_DIRECTION_RTL}.
*
* @return the layout direction.
*/
public int getLayoutDirection() {
return (mMarginFlags & LAYOUT_DIRECTION_MASK);
}
/**
* This will be called by {@link android.view.View#requestLayout()}. Left and Right margins
* may be overridden depending on layout direction.
*/
@Override
public void resolveLayoutDirection(int layoutDirection) {
setLayoutDirection(layoutDirection);
// No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything
// Will use the left and right margins if no relative margin is defined.
if (!isMarginRelative() ||
(mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return;
// Proceed with resolution
doResolveMargins();
}
private void doResolveMargins() {
if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) {
// if left or right margins are not defined and if we have some start or end margin
// defined then use those start and end margins.
if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK
&& startMargin > DEFAULT_MARGIN_RELATIVE) {
leftMargin = startMargin;
}
if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK
&& endMargin > DEFAULT_MARGIN_RELATIVE) {
rightMargin = endMargin;
}
} else {
// We have some relative margins (either the start one or the end one or both). So use
// them and override what has been defined for left and right margins. If either start
// or end margin is not defined, just set it to default "0".
switch(mMarginFlags & LAYOUT_DIRECTION_MASK) {
case View.LAYOUT_DIRECTION_RTL:
leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ?
endMargin : DEFAULT_MARGIN_RESOLVED;
rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ?
startMargin : DEFAULT_MARGIN_RESOLVED;
break;
case View.LAYOUT_DIRECTION_LTR:
default:
leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ?
startMargin : DEFAULT_MARGIN_RESOLVED;
rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ?
endMargin : DEFAULT_MARGIN_RESOLVED;
break;
}
}
mMarginFlags &= ~NEED_RESOLUTION_MASK;
}
/**
* @hide
*/
public boolean isLayoutRtl() {
return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL);
}
}
/**
* Indicates whether the ViewGroup is drawing its children in the order defined by
* {@link #getChildDrawingOrder(int, int)}.
*
* @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)},
* false otherwise
*
* @see #setChildrenDrawingOrderEnabled(boolean)
* @see #getChildDrawingOrder(int, int)
*/
protected boolean isChildrenDrawingOrderEnabled() {
return hasBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER);
}
/**
* Tells the ViewGroup whether to draw its children in the order defined by the method
* {@link #getChildDrawingOrder(int, int)}.
* <p>
* Note that {@link View#getZ() Z} reordering, done by {@link #dispatchDraw(Canvas)},
* will override custom child ordering done via this method.
*
* @param enabled true if the order of the children when drawing is determined by
* {@link #getChildDrawingOrder(int, int)}, false otherwise
*
* @see #isChildrenDrawingOrderEnabled()
* @see #getChildDrawingOrder(int, int)
*/
protected void setChildrenDrawingOrderEnabled(boolean enabled) {
setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled);
}
private boolean hasBooleanFlag(int flag) {
return (mGroupFlags & flag) == flag;
}
private void setBooleanFlag(int flag, boolean value) {
if (value) {
mGroupFlags |= flag;
} else {
mGroupFlags &= ~flag;
}
}
protected int getChildDrawingOrder(int childCount, int zOrder) {
return zOrder;
}
/**
* Populates (and returns) mPreSortedChildren with a pre-ordered list of the View's children,
* sorted first by Z, then by child drawing order (if applicable).
*
* Uses a stable, insertion sort which is commonly O(n) for ViewGroups with very few elevated
* children.
*/
ArrayList<View> buildOrderedChildList() {
/*final int count = mChildrenCount;
if (count <= 1 || !hasChildWithZ()) return null;
if (mPreSortedChildren == null) {
mPreSortedChildren = new ArrayList<View>(count);
} else {
mPreSortedChildren.ensureCapacity(count);
}
final boolean useCustomOrder = isChildrenDrawingOrderEnabled();
for (int i = 0; i < mChildrenCount; i++) {
// add next child (in child order) to end of list
int childIndex = useCustomOrder ? getChildDrawingOrder(mChildrenCount, i) : i;
View nextChild = mChildren[childIndex];
float currentZ = nextChild.getZ();
// insert ahead of any Views with greater Z
int insertIndex = i;
while (insertIndex > 0 && mPreSortedChildren.get(insertIndex - 1).getZ() > currentZ) {
insertIndex--;
}
mPreSortedChildren.add(insertIndex, nextChild);
}
return mPreSortedChildren;*/
return null;
}
@Override
public void forceStopFocusAnimation(){
for (int i = 0; i < mChildrenCount; i++) {
final View child = mChildren[i];
child.forceStopFocusAnimation();
}
}
/**
* 由于特殊情况下，想直接设置某个特定的view为focused，一般不建议调用该函数
* @param view
*/
@Deprecated
protected void setChildFocused(View view){
mFocused = view;
mPrivateFlags |= PFLAG_FOCUSED;
}
@Override
protected void drawableStateChanged() {
super.drawableStateChanged();
if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) {
if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) {
throw new IllegalStateException("addStateFromChildren cannot be enabled if a"
+ " child has duplicateParentState set to true");
}
final View[] children = mChildren;
final int count = mChildrenCount;
for (int i = 0; i < count; i++) {
final View child = children[i];
if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) {
child.refreshDrawableState();
}
}
}
}
@Override
protected int[] onCreateDrawableState(int extraSpace) {
if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) {
return super.onCreateDrawableState(extraSpace);
}
int need = 0;
int n = mChildrenCount;
for (int i = 0; i < n; i++) {
int[] childState = getChildAt(i).getDrawableState();
if (childState != null) {
need += childState.length;
}
}
int[] state = super.onCreateDrawableState(extraSpace + need);
for (int i = 0; i < n; i++) {
int[] childState = getChildAt(i).getDrawableState();
if (childState != null) {
state = mergeDrawableStates(state, childState);
}
}
return state;
}
/**
* If {@link #addStatesFromChildren} is true, refreshes this group's
* drawable state (to include the states from its children).
*/
public void childDrawableStateChanged(View child) {
if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) {
refreshDrawableState();
}
}
public Rect getChildDrawRect(Rect rect, int childDrawingOrder){
if(childDrawingOrder < 0 || childDrawingOrder >= mChildrenCount){
return null;
}
View component = mChildren[childDrawingOrder];
rect.set(component.mLeft, component.mTop, component.mRight, component.mBottom);
return rect;
}
public boolean isOverlap(Rect rectChild, Rect rectParent){
if(rectChild.left > rectParent.right){
return false;
}
if(rectChild.right < rectParent.left){
return false;
}
if(rectChild.top > rectParent.bottom){
return false;
}
if(rectChild.bottom < rectParent.top){
return false;
}
return true;
}
// TODO RenderNode begin
/**
* This method is used to cause children of this ViewGroup to restore or recreate their
* display lists. It is called by getDisplayList() when the parent ViewGroup does not need
* to recreate its own display list, which would happen if it went through the normal
* draw/dispatchDraw mechanisms.
*
* @hide
*/
@Override
protected void dispatchGetDisplayList() {
final int count = mChildrenCount;
final View[] children = mChildren;
for (int i = 0; i < count; i++) {
final View child = children[i];
if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null)) {
recreateChildDisplayList(child);
}
}
if (mOverlay != null) {
View overlayView = mOverlay.getOverlayView();
recreateChildDisplayList(overlayView);
}
if (mDisappearingChildren != null) {
final ArrayList<View> disappearingChildren = mDisappearingChildren;
final int disappearingCount = disappearingChildren.size();
for (int i = 0; i < disappearingCount; ++i) {
final View child = disappearingChildren.get(i);
recreateChildDisplayList(child);
}
}
}
private void recreateChildDisplayList(View child) {
child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED)
== PFLAG_INVALIDATED;
child.mPrivateFlags &= ~PFLAG_INVALIDATED;
child.getDisplayList();
child.mRecreateDisplayList = false;
}
void invalidateChild(View child, int l, int t, int r, int b) {
mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
if (mParent != null) {
if (mRenderNode.getLayerType() == LAYER_TYPE_HARDWARE) {
// invalidate layer.
mPrivateFlags |= PFLAG_INVALIDATED;
}
mParent.invalidateChild(this, l, t, r, b);
} else if (mAttachInfo != null) {
mAttachInfo.mViewRootImpl.requestRender();
}
}
/**
* @hide
*/
@Override
public boolean resolveRtlPropertiesIfNeeded() {
final boolean result = super.resolveRtlPropertiesIfNeeded();
// We dont need to resolve the children RTL properties if nothing has changed for the parent
if (result) {
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.isLayoutDirectionInherited()) {
child.resolveRtlPropertiesIfNeeded();
}
}
}
return result;
}
/**
* @hide
*/
@Override
public boolean resolveLayoutDirection() {
final boolean result = super.resolveLayoutDirection();
if (result) {
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.isLayoutDirectionInherited()) {
child.resolveLayoutDirection();
}
}
}
return result;
}
/**
* @hide
*/
@Override
public void resolvePadding() {
super.resolvePadding();
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.isLayoutDirectionInherited()) {
child.resolvePadding();
}
}
}
/**
* @hide
*/
@Override
protected void resolveDrawables() {
super.resolveDrawables();
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.isLayoutDirectionInherited()) {
child.resolveDrawables();
}
}
}
/**
* @hide
*/
@Override
public void resolveLayoutParams() {
super.resolveLayoutParams();
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
child.resolveLayoutParams();
}
}
/**
* @hide
*/
@Override
public void resetResolvedLayoutDirection() {
super.resetResolvedLayoutDirection();
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.isLayoutDirectionInherited()) {
child.resetResolvedLayoutDirection();
}
}
}
/**
* @hide
*/
@Override
public void resetResolvedPadding() {
super.resetResolvedPadding();
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.isLayoutDirectionInherited()) {
child.resetResolvedPadding();
}
}
}
/**
* @hide
*/
@Override
protected void resetResolvedDrawables() {
super.resetResolvedDrawables();
int count = getChildCount();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.isLayoutDirectionInherited()) {
child.resetResolvedDrawables();
}
}
}
}