package com.android.demo.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.GestureDetector.OnGestureListener;
import android.view.animation.Animation;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
import android.view.animation.TranslateAnimation;
import android.view.animation.Animation.AnimationListener;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import com.android.demo.R;
public class Panel extends LinearLayout {
private static final String TAG = "Panel";
/**
* Callback invoked when the panel is opened/closed.
*/
public static interface OnPanelListener {
/**
* Invoked when the panel becomes fully closed.
*/
public void onPanelClosed(Panel panel);
/**
* Invoked when the panel becomes fully opened.
*/
public void onPanelOpened(Panel panel);
}
private boolean mIsShrinking;
private int mPosition;
private int mDuration;
private boolean mLinearFlying;
private int mHandleId;
private int mContentId;
private View mHandle;
private View mContent;
private Drawable mOpenedHandle;
private Drawable mClosedHandle;
private float mTrackX;
private float mTrackY;
private float mVelocity;
private OnPanelListener panelListener;
public static final int TOP = 0;
public static final int BOTTOM = 1;
public static final int LEFT = 2;
public static final int RIGHT = 3;
private enum State {
ABOUT_TO_ANIMATE,
ANIMATING,
READY,
TRACKING,
FLYING,
};
private State mState;
private Interpolator mInterpolator;
private GestureDetector mGestureDetector;
private int mContentHeight;
private int mContentWidth;
private int mOrientation;
private float mWeight;
private PanelOnGestureListener mGestureListener;
private boolean mBringToFront;
public Panel(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Panel);
mDuration = a.getInteger(R.styleable.Panel_animationDuration, 750); // duration defaults to 750 ms
mPosition = a.getInteger(R.styleable.Panel_position, BOTTOM); // position defaults to BOTTOM
mLinearFlying = a.getBoolean(R.styleable.Panel_linearFlying, false); // linearFlying defaults to false
mWeight = a.getFraction(R.styleable.Panel_weight, 0, 1, 0.0f); // weight defaults to 0.0
if (mWeight < 0 || mWeight > 1) {
mWeight = 0.0f;
Log.w(TAG, a.getPositionDescription() + ": weight must be > 0 and <= 1");
}
mOpenedHandle = a.getDrawable(R.styleable.Panel_openedHandle);
mClosedHandle = a.getDrawable(R.styleable.Panel_closedHandle);
RuntimeException e = null;
mHandleId = a.getResourceId(R.styleable.Panel_handle, 0);
if (mHandleId == 0) {
e = new IllegalArgumentException(a.getPositionDescription() +
": The handle attribute is required and must refer to a valid child.");
}
mContentId = a.getResourceId(R.styleable.Panel_content, 0);
if (mContentId == 0) {
e = new IllegalArgumentException(a.getPositionDescription() +
": The content attribute is required and must refer to a valid child.");
}
a.recycle();
if (e != null) {
throw e;
}
mOrientation = (mPosition == TOP || mPosition == BOTTOM)? VERTICAL : HORIZONTAL;
setOrientation(mOrientation);
mState = State.READY;
mGestureListener = new PanelOnGestureListener();
mGestureDetector = new GestureDetector(mGestureListener);
mGestureDetector.setIsLongpressEnabled(false);
// i DON'T really know why i need this...
setBaselineAligned(false);
}
/**
* Sets the listener that receives a notification when the panel becomes open/close.
*
* @param onPanelListener The listener to be notified when the panel is opened/closed.
*/
public void setOnPanelListener(OnPanelListener onPanelListener) {
panelListener = onPanelListener;
}
/**
* Gets Panel's mHandle
*
* @return Panel's mHandle
*/
public View getHandle() {
return mHandle;
}
/**
* Gets Panel's mContent
*
* @return Panel's mContent
*/
public View getContent() {
return mContent;
}
/**
* Sets the acceleration curve for panel's animation.
*
* @param i The interpolator which defines the acceleration curve
*/
public void setInterpolator(Interpolator i) {
mInterpolator = i;
}
/**
* Set the opened state of Panel.
*
* @param open True if Panel is to be opened, false if Panel is to be closed.
* @param animate True if use animation, false otherwise.
*
* @return True if operation was performed, false otherwise.
*
*/
public boolean setOpen(boolean open, boolean animate) {
if (mState == State.READY && isOpen() ^ open) {
mIsShrinking = !open;
if (animate) {
mState = State.ABOUT_TO_ANIMATE;
if (!mIsShrinking) {
// this could make flicker so we test mState in dispatchDraw()
// to see if is equal to ABOUT_TO_ANIMATE
mContent.setVisibility(VISIBLE);
}
post(startAnimation);
} else {
mContent.setVisibility(open? VISIBLE : GONE);
postProcess();
}
return true;
}
return false;
}
/**
* Returns the opened status for Panel.
*
* @return True if Panel is opened, false otherwise.
*/
public boolean isOpen() {
return mContent.getVisibility() == VISIBLE;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
mHandle = findViewById(mHandleId);
if (mHandle == null) {
String name = getResources().getResourceEntryName(mHandleId);
throw new RuntimeException("Your Panel must have a child View whose id attribute is 'R.id." + name + "'");
}
mHandle.setOnTouchListener(touchListener);
mHandle.setOnClickListener(clickListener);
mContent = findViewById(mContentId);
if (mContent == null) {
String name = getResources().getResourceEntryName(mHandleId);
throw new RuntimeException("Your Panel must have a child View whose id attribute is 'R.id." + name + "'");
}
// reposition children
removeView(mHandle);
removeView(mContent);
if (mPosition == TOP || mPosition == LEFT) {
addView(mContent);
addView(mHandle);
} else {
addView(mHandle);
addView(mContent);
}
if (mClosedHandle != null) {
mHandle.setBackgroundDrawable(mClosedHandle);
}
mContent.setClickable(true);
mContent.setVisibility(GONE);
if (mWeight > 0) {
ViewGroup.LayoutParams params = mContent.getLayoutParams();
if (mOrientation == VERTICAL) {
params.height = ViewGroup.LayoutParams.FILL_PARENT;
} else {
params.width = ViewGroup.LayoutParams.FILL_PARENT;
}
mContent.setLayoutParams(params);
}
}
@Override
protected void onAttachedToWindow() {
super.onAttachedToWindow();
ViewParent parent = getParent();
if (parent != null && parent instanceof FrameLayout) {
mBringToFront = true;
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mWeight > 0 && mContent.getVisibility() == VISIBLE) {
View parent = (View) getParent();
if (parent != null) {
if (mOrientation == VERTICAL) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec((int) (parent.getHeight() * mWeight), MeasureSpec.EXACTLY);
} else {
widthMeasureSpec = MeasureSpec.makeMeasureSpec((int) (parent.getWidth() * mWeight), MeasureSpec.EXACTLY);
}
}
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
mContentWidth = mContent.getWidth();
mContentHeight = mContent.getHeight();
}
@Override
protected void dispatchDraw(Canvas canvas) {
// String name = getResources().getResourceEntryName(getId());
// Log.d(TAG, name + " ispatchDraw " + mState);
// this is why 'mState' was added:
// avoid flicker before animation start
if (mState == State.ABOUT_TO_ANIMATE && !mIsShrinking) {
int delta = mOrientation == VERTICAL? mContentHeight : mContentWidth;
if (mPosition == LEFT || mPosition == TOP) {
delta = -delta;
}
if (mOrientation == VERTICAL) {
canvas.translate(0, delta);
} else {
canvas.translate(delta, 0);
}
}
if (mState == State.TRACKING || mState == State.FLYING) {
canvas.translate(mTrackX, mTrackY);
}
super.dispatchDraw(canvas);
}
private float ensureRange(float v, int min, int max) {
v = Math.max(v, min);
v = Math.min(v, max);
return v;
}
OnTouchListener touchListener = new OnTouchListener() {
int initX;
int initY;
boolean setInitialPosition;
public boolean onTouch(View v, MotionEvent event) {
if (mState == State.ANIMATING) {
// we are animating
return false;
}
// Log.d(TAG, "state: " + mState + " x: " + event.getX() + " y: " + event.getY());
int action = event.getAction();
if (action == MotionEvent.ACTION_DOWN) {
if (mBringToFront) {
bringToFront();
}
initX = 0;
initY = 0;
if (mContent.getVisibility() == GONE) {
// since we may not know content dimensions we use factors here
if (mOrientation == VERTICAL) {
initY = mPosition == TOP? -1 : 1;
} else {
initX = mPosition == LEFT? -1 : 1;
}
}
setInitialPosition = true;
} else {
if (setInitialPosition) {
// now we know content dimensions, so we multiply factors...
initX *= mContentWidth;
initY *= mContentHeight;
// ... and set initial panel's position
mGestureListener.setScroll(initX, initY);
setInitialPosition = false;
// for offsetLocation we have to invert values
initX = -initX;
initY = -initY;
}
// offset every ACTION_MOVE & ACTION_UP event
event.offsetLocation(initX, initY);
}
if (!mGestureDetector.onTouchEvent(event)) {
if (action == MotionEvent.ACTION_UP) {
// tup up after scrolling
post(startAnimation);
}
}
return false;
}
};
OnClickListener clickListener = new OnClickListener() {
public void onClick(View v) {
if (mBringToFront) {
bringToFront();
}
if (initChange()) {
post(startAnimation);
}
}
};
public boolean initChange() {
if (mState != State.READY) {
// we are animating or just about to animate
return false;
}
mState = State.ABOUT_TO_ANIMATE;
mIsShrinking = mContent.getVisibility() == VISIBLE;
if (!mIsShrinking) {
// this could make flicker so we test mState in dispatchDraw()
// to see if is equal to ABOUT_TO_ANIMATE
mContent.setVisibility(VISIBLE);
}
return true;
}
Runnable startAnimation = new Runnable() {
public void run() {
// this is why we post this Runnable couple of lines above:
// now its save to use mContent.getHeight() && mContent.getWidth()
TranslateAnimation animation;
int fromXDelta = 0, toXDelta = 0, fromYDelta = 0, toYDelta = 0;
if (mState == State.FLYING) {
mIsShrinking = (mPosition == TOP || mPosition == LEFT) ^ (mVelocity > 0);
}
int calculatedDuration;
if (mOrientation == VERTICAL) {
int height = mContentHeight;
if (!mIsShrinking) {
fromYDelta = mPosition == TOP? -height : height;
} else {
toYDelta = mPosition == TOP? -height : height;
}
if (mState == State.TRACKING) {
if (Math.abs(mTrackY - fromYDelta) < Math.abs(mTrackY - toYDelta)) {
mIsShrinking = !mIsShrinking;
toYDelta = fromYDelta;
}
fromYDelta = (int) mTrackY;
} else
if (mState == State.FLYING) {
fromYDelta = (int) mTrackY;
}
// for FLYING events we calculate animation duration based on flying velocity
// also for very high velocity make sure duration >= 20 ms
if (mState == State.FLYING && mLinearFlying) {
calculatedDuration = (int) (1000 * Math.abs((toYDelta - fromYDelta) / mVelocity));
calculatedDuration = Math.max(calculatedDuration, 20);
} else {
calculatedDuration = mDuration * Math.abs(toYDelta - fromYDelta) / mContentHeight;
}
} else {
int width = mContentWidth;
if (!mIsShrinking) {
fromXDelta = mPosition == LEFT? -width : width;
} else {
toXDelta = mPosition == LEFT? -width : width;
}
if (mState == State.TRACKING) {
if (Math.abs(mTrackX - fromXDelta) < Math.abs(mTrackX - toXDelta)) {
mIsShrinking = !mIsShrinking;
toXDelta = fromXDelta;
}
fromXDelta = (int) mTrackX;
} else
if (mState == State.FLYING) {
fromXDelta = (int) mTrackX;
}
// for FLYING events we calculate animation duration based on flying velocity
// also for very high velocity make sure duration >= 20 ms
if (mState == State.FLYING && mLinearFlying) {
calculatedDuration = (int) (1000 * Math.abs((toXDelta - fromXDelta) / mVelocity));
calculatedDuration = Math.max(calculatedDuration, 20);
} else {
calculatedDuration = mDuration * Math.abs(toXDelta - fromXDelta) / mContentWidth;
}
}
mTrackX = mTrackY = 0;
if (calculatedDuration == 0) {
mState = State.READY;
if (mIsShrinking) {
mContent.setVisibility(GONE);
}
postProcess();
return;
}
animation = new TranslateAnimation(fromXDelta, toXDelta, fromYDelta, toYDelta);
animation.setDuration(calculatedDuration);
animation.setAnimationListener(animationListener);
if (mState == State.FLYING && mLinearFlying) {
animation.setInterpolator(new LinearInterpolator());
} else
if (mInterpolator != null) {
animation.setInterpolator(mInterpolator);
}
startAnimation(animation);
}
};
private AnimationListener animationListener = new AnimationListener() {
public void onAnimationEnd(Animation animation) {
mState = State.READY;
if (mIsShrinking) {
mContent.setVisibility(GONE);
}
postProcess();
}
public void onAnimationRepeat(Animation animation) {
}
public void onAnimationStart(Animation animation) {
mState = State.ANIMATING;
}
};
private void postProcess() {
if (mIsShrinking && mClosedHandle != null) {
mHandle.setBackgroundDrawable(mClosedHandle);
} else
if (!mIsShrinking && mOpenedHandle != null) {
mHandle.setBackgroundDrawable(mOpenedHandle);
}
// invoke listener if any
if (panelListener != null) {
if (mIsShrinking) {
panelListener.onPanelClosed(Panel.this);
} else {
panelListener.onPanelOpened(Panel.this);
}
}
}
class PanelOnGestureListener implements OnGestureListener {
float scrollY;
float scrollX;
public void setScroll(int initScrollX, int initScrollY) {
scrollX = initScrollX;
scrollY = initScrollY;
}
public boolean onDown(MotionEvent e) {
scrollX = scrollY = 0;
initChange();
return true;
}
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
mState = State.FLYING;
mVelocity = mOrientation == VERTICAL? velocityY : velocityX;
post(startAnimation);
return true;
}
public void onLongPress(MotionEvent e) {
// not used
}
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
mState = State.TRACKING;
float tmpY = 0, tmpX = 0;
if (mOrientation == VERTICAL) {
scrollY -= distanceY;
if (mPosition == TOP) {
tmpY = ensureRange(scrollY, -mContentHeight, 0);
} else {
tmpY = ensureRange(scrollY, 0, mContentHeight);
}
} else {
scrollX -= distanceX;
if (mPosition == LEFT) {
tmpX = ensureRange(scrollX, -mContentWidth, 0);
} else {
tmpX = ensureRange(scrollX, 0, mContentWidth);
}
}
if (tmpX != mTrackX || tmpY != mTrackY) {
mTrackX = tmpX;
mTrackY = tmpY;
invalidate();
}
return true;
}
public void onShowPress(MotionEvent e) {
// not used
}
public boolean onSingleTapUp(MotionEvent e) {
// not used
return false;
}
}
}