/*
* HorizontalVariableListView.java v1.0
* Handles horizontal variable widths item scrolling
*
*/
package com.aviary.android.feather.widget;
import java.lang.ref.WeakReference;
import java.util.ArrayList;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.PorterDuff.Mode;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.Gravity;
import android.view.HapticFeedbackConstants;
import android.view.MotionEvent;
import android.view.SoundEffectConstants;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.ViewTreeObserver.OnScrollChangedListener;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import com.aviary.android.feather.R;
import com.aviary.android.feather.database.DataSetObserverExtended;
import com.aviary.android.feather.library.utils.ReflectionUtils;
import com.aviary.android.feather.library.utils.ReflectionUtils.ReflectionException;
import com.aviary.android.feather.widget.HorizontalFixedListView.OnItemDragListener;
import com.aviary.android.feather.widget.IFlingRunnable.FlingRunnableView;
import com.aviary.android.feather.widget.wp.EdgeGlow;
// TODO: Auto-generated Javadoc
/**
* The Class HorizontialFixedListView.
*/
public class HorizontalVariableListView extends HorizontalListView implements OnGestureListener, FlingRunnableView {
public interface OnItemClickedListener {
/**
* Callback method to be invoked when an item in this AdapterView has
* been clicked.
* <p>
* Implementers can call getItemAtPosition(position) if they need
* to access the data associated with the selected item.
*
* @param parent The AdapterView where the click happened.
* @param view The view within the AdapterView that was clicked (this
* will be a view provided by the adapter)
* @param position The position of the view in the adapter.
* @param id The row id of the item that was clicked.
* @return if the implementation return false, then the selection will not be updated
*/
boolean onItemClick(AdapterView<?> parent, View view, int position, long id);
}
/** The Constant LOG_TAG. */
protected static final String LOG_TAG = "horizontal-variable-list";
private static final float WIDTH_THRESHOLD = 1.1f;
protected int mAlignMode = Gravity.CENTER;
protected int mSelectedPositionInt = INVALID_POSITION;
protected View mSelectedPositionView;
protected int mHeight = 0;
protected int mPaddingTop = 0;
protected int mPaddingBottom = 0;
/** The m adapter. */
protected ListAdapter mAdapter;
private int mAdapterItemCount;
/** The m left view index. */
private int mLeftViewIndex = -1;
/** The m right view index. */
private int mRightViewIndex = 0;
/** The m gesture. */
private GestureDetector mGesture;
/** The m removed view queue. */
private List<Queue<View>> mRecycleBin;
private List<Integer> mChildWidths = new ArrayList<Integer>();
private List<Integer> mChildHeights = new ArrayList<Integer>();
/** The m on item selected. */
private OnItemSelectedListener mOnItemSelected;
/** The m on item clicked. */
private OnItemClickedListener mOnItemClicked;
/** The m data changed. */
private boolean mDataChanged = false;
/** The m fling runnable. */
private IFlingRunnable mFlingRunnable;
/** The m force layout. */
private boolean mForceLayout;
private int mDragTolerance = 0;
private boolean mDragScrollEnabled;
protected EdgeGlow mEdgeGlowLeft, mEdgeGlowRight;
private int mOverScrollMode = OVER_SCROLL_NEVER;
private Matrix mEdgeMatrix = new Matrix();
private ScrollNotifier mScrollNotifier;
private OnItemDragListener mItemDragListener;
private OnScrollChangedListener mScrollListener;
public void setOnItemDragListener( OnItemDragListener listener ) {
mItemDragListener = listener;
}
public void setOnScrollListener( OnScrollChangedListener listener ) {
mScrollListener = listener;
}
public OnItemDragListener getOnItemDragListener() {
return mItemDragListener;
}
/**
* Instantiates a new horizontial fixed list view.
*
* @param context
* the context
* @param attrs
* the attrs
*/
public HorizontalVariableListView( Context context, AttributeSet attrs ) {
super( context, attrs );
initView();
}
public HorizontalVariableListView( Context context, AttributeSet attrs, int defStyle ) {
super( context, attrs, defStyle );
initView();
}
/**
* Inits the view.
*/
private synchronized void initView() {
if ( Build.VERSION.SDK_INT > 8 ) {
try {
mFlingRunnable = (IFlingRunnable) ReflectionUtils.newInstance( "com.aviary.android.feather.widget.Fling9Runnable", new Class<?>[] { FlingRunnableView.class, int.class }, this, mAnimationDuration );
} catch ( ReflectionException e ) {
mFlingRunnable = new Fling8Runnable( this, mAnimationDuration );
}
} else {
mFlingRunnable = new Fling8Runnable( this, mAnimationDuration );
}
mLeftViewIndex = -1;
mRightViewIndex = 0;
mMaxX = Integer.MAX_VALUE;
mMinX = 0;
mChildHeight = 0;
mRightEdge = 0;
mLeftEdge = 0;
mGesture = new GestureDetector( getContext(), mGestureListener );
mGesture.setIsLongpressEnabled( false );
setFocusable( true );
setFocusableInTouchMode( true );
ViewConfiguration configuration = ViewConfiguration.get( getContext() );
mTouchSlop = configuration.getScaledTouchSlop();
mDragTolerance = mTouchSlop;
mOverscrollDistance = 10;
mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
}
public void setOverScrollMode( int mode ) {
mOverScrollMode = mode;
if ( mode != OVER_SCROLL_NEVER ) {
if ( mEdgeGlowLeft == null ) {
Drawable glow = getContext().getResources().getDrawable( R.drawable.feather_overscroll_glow );
Drawable edge = getContext().getResources().getDrawable( R.drawable.feather_overscroll_edge );
mEdgeGlowLeft = new EdgeGlow( edge, glow );
mEdgeGlowRight = new EdgeGlow( edge, glow );
mEdgeGlowLeft.setColorFilter( 0xFF33b5e5, Mode.MULTIPLY );
}
} else {
mEdgeGlowLeft = mEdgeGlowRight = null;
}
}
public void setEdgeHeight( int value ) {
mEdgesHeight = value;
}
public void setEdgeGravityY( int value ) {
mEdgesGravityY = value;
}
@Override
public void trackMotionScroll( int newX ) {
scrollTo( newX, 0 );
mCurrentX = getScrollX();
removeNonVisibleItems( mCurrentX );
fillList( mCurrentX );
invalidate();
}
@Override
protected void dispatchDraw( Canvas canvas ) {
super.dispatchDraw( canvas );
if ( getChildCount() > 0 ) {
drawEdges( canvas );
}
}
/**
* Draw glow edges.
*
* @param canvas
* the canvas
*/
private void drawEdges( Canvas canvas ) {
if ( mEdgeGlowLeft != null ) {
if ( !mEdgeGlowLeft.isFinished() ) {
final int restoreCount = canvas.save();
final int height = mEdgesHeight;
mEdgeMatrix.reset();
mEdgeMatrix.postRotate( -90 );
mEdgeMatrix.postTranslate( 0, height );
if ( mEdgesGravityY == Gravity.BOTTOM ) {
mEdgeMatrix.postTranslate( 0, getHeight() - height );
}
canvas.concat( mEdgeMatrix );
mEdgeGlowLeft.setSize( height, height / 5 );
if ( mEdgeGlowLeft.draw( canvas ) ) {
postInvalidate();
}
canvas.restoreToCount( restoreCount );
}
if ( !mEdgeGlowRight.isFinished() ) {
final int restoreCount = canvas.save();
final int width = getWidth();
final int height = mEdgesHeight;
mEdgeMatrix.reset();
mEdgeMatrix.postRotate( 90 );
mEdgeMatrix.postTranslate( mCurrentX + width, 0 );
if ( mEdgesGravityY == Gravity.BOTTOM ) {
mEdgeMatrix.postTranslate( 0, getHeight() - height );
}
canvas.concat( mEdgeMatrix );
mEdgeGlowRight.setSize( height, height / 5 );
if ( mEdgeGlowRight.draw( canvas ) ) {
postInvalidate();
}
canvas.restoreToCount( restoreCount );
}
}
}
/**
* Set if a vertical scroll movement will trigger a long click event
*
* @param value
*/
public void setDragScrollEnabled( boolean value ) {
mDragScrollEnabled = value;
}
public boolean getDragScrollEnabled() {
return mDragScrollEnabled;
}
public int getSelectedPosition() {
return mSelectedPositionInt;
}
public void setSelectedPosition( int position, boolean fireEvent ) {
Log.i( LOG_TAG, "setSelectedPosition: " + position );
mSelectedPositionInt = position;
if( position == INVALID_POSITION ) {
setSelectedItem( null, INVALID_POSITION );
if ( mOnItemSelected != null && fireEvent ) {
mOnItemSelected.onNothingSelected( this );
}
} else {
View child = getItemAt( position );
if( null != child ) {
setSelectedItem( child, position );
if ( mOnItemSelected != null && fireEvent ) {
mOnItemSelected.onItemSelected( this, child, position, mAdapter.getItemId( position ) );
}
}
}
}
@Override
public void setOnItemSelectedListener( AdapterView.OnItemSelectedListener listener ) {
mOnItemSelected = listener;
}
public void setOnItemClickedListener( OnItemClickedListener listener ) {
mOnItemClicked = listener;
}
private DataSetObserverExtended mDataObserverExtended = new DataSetObserverExtended() {
public void onAdded() {
synchronized ( HorizontalVariableListView.this ) {
mAdapterItemCount = mAdapter.getCount();
}
Log.i( LOG_TAG, "onAdded: " + mAdapterItemCount );
mDataChanged = true;
mMaxX = Integer.MAX_VALUE;
requestLayout();
};
public void onRemoved() {
this.onChanged();
};
public void onChanged() {
mAdapterItemCount = mAdapter.getCount();
Log.i( LOG_TAG, "onChange: " + mAdapterItemCount );
reset();
};
public void onInvalidated() {
this.onChanged();
};
};
/** The m data observer. */
private DataSetObserver mDataObserver = new DataSetObserver() {
@Override
public void onChanged() {
synchronized ( HorizontalVariableListView.this ) {
mAdapterItemCount = mAdapter.getCount();
}
Log.i( LOG_TAG, "onChanged(2): " + mAdapterItemCount );
invalidate();
reset();
}
@Override
public void onInvalidated() {
mAdapterItemCount = mAdapter.getCount();
Log.i( LOG_TAG, "onInvalidated(2): " + mAdapterItemCount );
invalidate();
reset();
}
};
public void requestFullLayout() {
mForceLayout = true;
invalidate();
requestLayout();
}
/** The m height measure spec. */
private int mHeightMeasureSpec;
/** The m width measure spec. */
private int mWidthMeasureSpec;
/** The m left edge. */
private int mRightEdge, mLeftEdge;
/*
* (non-Javadoc)
*
* @see android.widget.AdapterView#getAdapter()
*/
@Override
public ListAdapter getAdapter() {
return mAdapter;
}
@Override
public View getSelectedView() {
return null;
}
@Override
public void setAdapter( ListAdapter adapter ) {
if ( mAdapter != null ) {
if ( mAdapter instanceof BaseAdapterExtended ) {
( (BaseAdapterExtended) mAdapter ).unregisterDataSetObserverExtended( mDataObserverExtended );
} else {
mAdapter.unregisterDataSetObserver( mDataObserver );
}
emptyRecycler();
mAdapterItemCount = 0;
}
mAdapter = adapter;
mChildWidths.clear();
mChildHeights.clear();
if ( mAdapter != null ) {
mAdapterItemCount = mAdapter.getCount();
if ( mAdapter instanceof BaseAdapterExtended ) {
( (BaseAdapterExtended) mAdapter ).registerDataSetObserverExtended( mDataObserverExtended );
} else {
mAdapter.registerDataSetObserver( mDataObserver );
}
int total = mAdapter.getViewTypeCount();
mRecycleBin = Collections.synchronizedList( new ArrayList<Queue<View>>() );
for ( int i = 0; i < total; i++ ) {
mRecycleBin.add( new LinkedList<View>() );
mChildWidths.add( -1 );
mChildHeights.add( -1 );
}
}
reset();
}
private void emptyRecycler() {
if ( null != mRecycleBin ) {
while ( mRecycleBin.size() > 0 ) {
Queue<View> recycler = mRecycleBin.remove( 0 );
recycler.clear();
}
mRecycleBin.clear();
}
}
/**
* Reset.
*/
private synchronized void reset() {
mCurrentX = 0;
initView();
removeAllViewsInLayout();
mForceLayout = true;
requestLayout();
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
Log.d( LOG_TAG, "onDetachedFromWindow" );
mSelectedPositionView = null;
removeCallbacks( mScrollNotifier );
emptyRecycler();
}
/*
* (non-Javadoc)
*
* @see android.widget.AdapterView#setSelection(int)
*/
@Override
public void setSelection( int position ) {}
/*
* (non-Javadoc)
*
* @see android.view.View#onMeasure(int, int)
*/
@Override
protected void onMeasure( int widthMeasureSpec, int heightMeasureSpec ) {
super.onMeasure( widthMeasureSpec, heightMeasureSpec );
mHeightMeasureSpec = heightMeasureSpec;
mWidthMeasureSpec = widthMeasureSpec;
}
/**
* Adds the and measure child.
*
* @param child
* the child
* @param viewPos
* the view pos
*/
private void addAndMeasureChild( final View child, int viewPos ) {
LayoutParams params = child.getLayoutParams();
if ( params == null ) {
params = new LayoutParams( LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT );
}
addViewInLayout( child, viewPos, params, false );
forceChildLayout( child, params );
}
public void forceChildLayout( View child, LayoutParams params ) {
int childHeightSpec = ViewGroup.getChildMeasureSpec( mHeightMeasureSpec, getPaddingTop() + getPaddingBottom(), params.height );
int childWidthSpec = ViewGroup.getChildMeasureSpec( mWidthMeasureSpec, getPaddingLeft() + getPaddingRight(), params.width );
child.measure( childWidthSpec, childHeightSpec );
}
@Override
protected void onLayout( boolean changed, int left, int top, int right, int bottom ) {
super.onLayout( changed, left, top, right, bottom );
if ( mAdapter == null ) {
return;
}
Log.i( LOG_TAG, "onLayout. changed: " + changed + ", datachanged: " + mDataChanged + ", forceLayout: " + mForceLayout );
if ( !changed && !mDataChanged ) {
layoutChildren();
}
mHeight = bottom - top;
int trackValue;
if ( changed ) {
mPaddingTop = getPaddingTop();
mPaddingBottom = getPaddingBottom();
trackValue = mCurrentX = mOldX = 0;
initView();
removeAllViewsInLayout();
}
if ( mDataChanged ) {
trackValue = mCurrentX;
mDataChanged = false;
}
if ( mForceLayout ) {
mOldX = mCurrentX;
trackValue = mOldX;
initView();
removeAllViewsInLayout();
}
if( changed || mDataChanged || mForceLayout ) {
trackMotionScroll( mOldX );
mForceLayout = false;
}
}
public void layoutChildren() {
int left, right;
for ( int i = 0; i < getChildCount(); i++ ) {
View child = getChildAt( i );
forceChildLayout( child, child.getLayoutParams() );
left = child.getLeft();
right = child.getRight();
int childHeight = child.getHeight();
layoutChild( child, left, right, childHeight );
// child.layout( left, top, right, top + childHeight );
}
}
/**
* Fill list.
*
* @param positionX
* the position x
*/
private void fillList( final int positionX ) {
int edge = 0;
View child = getChildAt( getChildCount() - 1 );
if ( child != null ) {
edge = child.getRight();
}
fillListRight( mCurrentX, edge );
edge = 0;
child = getChildAt( 0 );
if ( child != null ) {
edge = child.getLeft();
}
fillListLeft( mCurrentX, edge );
}
/**
* Fill list left.
*
* @param positionX
* the position x
* @param leftEdge
* the left edge
*/
private void fillListLeft( int positionX, int leftEdge ) {
if ( mAdapter == null ) return;
while ( ( leftEdge - positionX ) > mLeftEdge && mLeftViewIndex >= 0 ) {
final boolean selected = mSelectedPositionInt == mLeftViewIndex;
int viewType = mAdapter.getItemViewType( mLeftViewIndex );
View child = mAdapter.getView( mLeftViewIndex, mRecycleBin.get( viewType ).poll(), this );
child.setSelected( selected );
addAndMeasureChild( child, 0 );
int childWidth = mChildWidths.get( viewType );
int childHeight = mChildHeights.get( viewType );
layoutChild( child, leftEdge - childWidth, leftEdge, childHeight );
if( selected ) {
mSelectedPositionView = child;
}
leftEdge -= childWidth;
mLeftViewIndex--;
}
}
public View getItemAt( int position ) {
return getChildAt( position - ( mLeftViewIndex + 1 ) );
}
@Override
public int getScreenPositionForView( View view ) {
View listItem = view;
try {
View v;
while ( !this.equals( ( v = (View) listItem.getParent() ) ) ) {
listItem = v;
}
} catch ( ClassCastException e ) {
// We made it up to the window without find this list view
return INVALID_POSITION;
} catch ( NullPointerException e ) {
return INVALID_POSITION;
}
// Search the children for the list item
final int childCount = getChildCount();
for ( int i = 0; i < childCount; i++ ) {
if ( getChildAt( i ).equals( listItem ) ) {
return i;
}
}
// Child not found!
return INVALID_POSITION;
}
@Override
public int getPositionForView( View view ) {
View listItem = view;
try {
View v;
while ( !( v = (View) listItem.getParent() ).equals( this ) ) {
listItem = v;
}
} catch ( ClassCastException e ) {
// We made it up to the window without find this list view
return INVALID_POSITION;
}
// Search the children for the list item
final int childCount = getChildCount();
for ( int i = 0; i < childCount; i++ ) {
if ( getChildAt( i ).equals( listItem ) ) {
return mLeftViewIndex + i + 1;
}
}
// Child not found!
return INVALID_POSITION;
}
/**
* Fill list right.
*
* @param positionX
* the position x
* @param rightEdge
* the right edge
*/
private void fillListRight( int positionX, int rightEdge ) {
boolean firstChild = getChildCount() == 0 || mDataChanged || mForceLayout;
if ( mAdapter == null ) return;
final int realWidth = getWidth();
int viewWidth = (int) ( (float) realWidth * WIDTH_THRESHOLD );
while ( ( rightEdge - positionX ) < viewWidth || firstChild ) {
if ( mRightViewIndex >= mAdapterItemCount ) {
break;
}
final boolean selected = mSelectedPositionInt == mRightViewIndex;
int viewType = mAdapter.getItemViewType( mRightViewIndex );
View child = mAdapter.getView( mRightViewIndex, mRecycleBin.get( viewType ).poll(), this );
child.setSelected( selected );
addAndMeasureChild( child, -1 );
int childWidth = mChildWidths.get( viewType );
int childHeight = mChildHeights.get( viewType );
if ( childWidth == -1 ) {
childWidth = child.getMeasuredWidth();
childHeight = child.getMeasuredHeight();
mChildWidths.set( viewType, childWidth );
mChildHeights.set( viewType, childHeight );
}
if ( firstChild ) {
mChildHeight = child.getMeasuredHeight();
if ( mEdgesHeight == -1 ) {
mEdgesHeight = mChildHeight;
}
mRightEdge = viewWidth;
mLeftEdge = ( realWidth - viewWidth );
mMinX = 0;
firstChild = false;
}
layoutChild( child, rightEdge, rightEdge + childWidth, childHeight );
if( selected ) {
mSelectedPositionView = child;
}
rightEdge += childWidth;
mRightViewIndex++;
}
if ( mRightViewIndex == mAdapterItemCount ) {
// Log.i( LOG_TAG, "itemCount: " + mAdapterItemCount );
// Log.i( LOG_TAG, "rightEdge: " + rightEdge );
// Log.i( LOG_TAG, "realWidth: " + realWidth );
if ( rightEdge > realWidth ) {
mMaxX = rightEdge - realWidth;
} else {
mMaxX = 0;
}
// Log.i( LOG_TAG, "maxX: " + mMaxX );
}
}
protected void layoutChild( View child, int left, int right, int childHeight ) {
// Log.i( LOG_TAG, "layoutChild. height: " + mHeight + ", child.height: " + childHeight );
int top = mPaddingTop;
if ( mAlignMode == Gravity.BOTTOM ) {
top = top + ( mHeight - childHeight );
} else if ( mAlignMode == Gravity.CENTER ) {
top = top + ( mHeight - childHeight ) / 2;
}
child.layout( left, top, right, top + childHeight );
}
/**
* Removes the non visible items.
*
* @param positionX
* the position x
*/
private void removeNonVisibleItems( final int positionX ) {
View child = getChildAt( 0 );
// remove to left...
while ( child != null && child.getRight() - positionX <= mLeftEdge ) {
if ( null != mAdapter ) {
int position = getPositionForView( child );
int viewType = mAdapter.getItemViewType( position );
mRecycleBin.get( viewType ).offer( child );
}
removeViewInLayout( child );
mLeftViewIndex++;
child = getChildAt( 0 );
}
// remove to right...
child = getChildAt( getChildCount() - 1 );
while ( child != null && child.getLeft() - positionX >= mRightEdge ) {
if ( null != mAdapter ) {
int position = getPositionForView( child );
int viewType = mAdapter.getItemViewType( position );
mRecycleBin.get( viewType ).offer( child );
}
removeViewInLayout( child );
mRightViewIndex--;
child = getChildAt( getChildCount() - 1 );
}
}
private float mTestDragX, mTestDragY;
private boolean mCanCheckDrag;
private boolean mWasFlinging;
private WeakReference<View> mOriginalDragItem;
@Override
public boolean onDown( MotionEvent event ) {
return true;
}
@Override
public boolean onScroll( MotionEvent e1, MotionEvent e2, float distanceX, float distanceY ) {
return true;
}
@Override
public boolean onFling( MotionEvent event0, MotionEvent event1, float velocityX, float velocityY ) {
if ( mMaxX == 0 ) return false;
mCanCheckDrag = false;
mWasFlinging = true;
mFlingRunnable.startUsingVelocity( mCurrentX, (int) -velocityX );
return true;
}
@Override
public void onLongPress( MotionEvent e ) {
if ( mWasFlinging ) return;
OnItemLongClickListener listener = getOnItemLongClickListener();
if ( null != listener ) {
if ( !mFlingRunnable.isFinished() ) return;
int i = getChildAtPosition( e.getX(), e.getY() );
if ( i > -1 ) {
View child = getChildAt( i );
fireLongPress( child, mLeftViewIndex + 1 + i, mAdapter.getItemId( mLeftViewIndex + 1 + i ) );
}
}
}
private int getChildAtPosition( float x, float y ) {
Rect viewRect = new Rect();
for ( int i = 0; i < getChildCount(); i++ ) {
View child = getChildAt( i );
int left = child.getLeft();
int right = child.getRight();
int top = child.getTop();
int bottom = child.getBottom();
viewRect.set( left, top, right, bottom );
viewRect.offset( -mCurrentX, 0 );
if ( viewRect.contains( (int) x, (int) y ) ) {
return i;
}
}
return -1;
}
private boolean fireLongPress( View item, int position, long id ) {
if ( getOnItemLongClickListener().onItemLongClick( HorizontalVariableListView.this, item, position, id ) ) {
performHapticFeedback( HapticFeedbackConstants.LONG_PRESS );
return true;
}
return false;
}
private boolean fireItemDragStart( View item, int position, long id ) {
mCanCheckDrag = false;
mIsBeingDragged = false;
if ( mItemDragListener.onItemStartDrag( HorizontalVariableListView.this, item, position, id ) ) {
mIsDragging = true;
performHapticFeedback( HapticFeedbackConstants.LONG_PRESS );
return true;
}
return false;
}
private void fireOnScrollChanged() {
if ( mScrollListener != null ) {
mScrollListener.onScrollChanged();
}
}
private void postScrollNotifier() {
if ( mScrollListener != null ) {
if ( mScrollNotifier == null ) {
mScrollNotifier = new ScrollNotifier();
}
post( mScrollNotifier );
}
}
private class ScrollNotifier implements Runnable {
@Override
public void run() {
fireOnScrollChanged();
}
}
public void setIsDragging( boolean value ) {
mIsDragging = value;
}
private int getItemIndex( View view ) {
final int total = getChildCount();
for ( int i = 0; i < total; i++ ) {
if ( view == getChildAt( i ) ) {
return i;
}
}
return -1;
}
/*
* (non-Javadoc)
*
* @see android.view.GestureDetector.OnGestureListener#onShowPress(android.view.MotionEvent)
*/
@Override
public void onShowPress( MotionEvent arg0 ) {}
/*
* (non-Javadoc)
*
* @see android.view.GestureDetector.OnGestureListener#onSingleTapUp(android.view.MotionEvent)
*/
@Override
public boolean onSingleTapUp( MotionEvent arg0 ) {
return false;
}
private boolean mIsDragging = false;
private boolean mIsBeingDragged = false;
private int mActivePointerId = -1;
private int mLastMotionX;
private float mLastMotionX2;
private VelocityTracker mVelocityTracker;
private static final int INVALID_POINTER = -1;
private int mOverscrollDistance;
private int mMinimumVelocity;
private int mMaximumVelocity;
private void initOrResetVelocityTracker() {
if ( mVelocityTracker == null ) {
mVelocityTracker = VelocityTracker.obtain();
} else {
mVelocityTracker.clear();
}
}
private void initVelocityTrackerIfNotExists() {
if ( mVelocityTracker == null ) {
mVelocityTracker = VelocityTracker.obtain();
}
}
private void recycleVelocityTracker() {
if ( mVelocityTracker != null ) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
}
@Override
public void requestDisallowInterceptTouchEvent( boolean disallowIntercept ) {
if ( disallowIntercept ) {
recycleVelocityTracker();
}
super.requestDisallowInterceptTouchEvent( disallowIntercept );
}
@Override
public boolean onInterceptTouchEvent( MotionEvent ev ) {
if ( mIsDragging ) return false;
final int action = ev.getAction();
mGesture.onTouchEvent( ev );
/*
* Shortcut the most recurring case: the user is in the dragging state and he is moving his finger. We want to intercept this
* motion.
*/
if ( action == MotionEvent.ACTION_MOVE ) {
if ( mIsBeingDragged ) {
return true;
}
}
switch ( action & MotionEvent.ACTION_MASK ) {
case MotionEvent.ACTION_MOVE: {
/*
* mIsBeingDragged == false, otherwise the shortcut would have caught it. Check whether the user has moved far enough
* from his original down touch.
*/
final int activePointerId = mActivePointerId;
if ( activePointerId == INVALID_POINTER ) {
// If we don't have a valid id, the touch down wasn't on content.
break;
}
final int pointerIndex = ev.findPointerIndex( activePointerId );
final int x = (int) ev.getX( pointerIndex );
final int y = (int) ev.getY( pointerIndex );
final int xDiff = Math.abs( x - mLastMotionX );
mLastMotionX2 = x;
if ( checkDrag( x, y ) ) {
return false;
}
if ( xDiff > mTouchSlop ) {
mIsBeingDragged = true;
mLastMotionX = x;
initVelocityTrackerIfNotExists();
mVelocityTracker.addMovement( ev );
final ViewParent parent = getParent();
if ( parent != null ) {
parent.requestDisallowInterceptTouchEvent( true );
}
postScrollNotifier();
}
break;
}
case MotionEvent.ACTION_DOWN: {
final int x = (int) ev.getX();
final int y = (int) ev.getY();
mTestDragX = x;
mTestDragY = y;
/*
* Remember location of down touch. ACTION_DOWN always refers to pointer index 0.
*/
mLastMotionX = x;
mLastMotionX2 = x;
mActivePointerId = ev.getPointerId( 0 );
initOrResetVelocityTracker();
mVelocityTracker.addMovement( ev );
/*
* If being flinged and user touches the screen, initiate drag; otherwise don't. mScroller.isFinished should be false
* when being flinged.
*/
mIsBeingDragged = !mFlingRunnable.isFinished();
mWasFlinging = !mFlingRunnable.isFinished();
mFlingRunnable.stop( false );
mCanCheckDrag = getDragScrollEnabled() && ( mItemDragListener != null );
if ( mCanCheckDrag ) {
int i = getChildAtPosition( x, y );
if ( i > -1 ) {
mOriginalDragItem = new WeakReference<View>( getChildAt( i ) );
}
}
break;
}
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
/* Release the drag */
mIsBeingDragged = false;
mActivePointerId = INVALID_POINTER;
recycleVelocityTracker();
if ( mFlingRunnable.springBack( mCurrentX, 0, mMinX, mMaxX, 0, 0 ) ) {
postInvalidate();
}
mCanCheckDrag = false;
break;
case MotionEvent.ACTION_POINTER_UP:
onSecondaryPointerUp( ev );
break;
}
return mIsBeingDragged;
}
@Override
public boolean onTouchEvent( MotionEvent ev ) {
initVelocityTrackerIfNotExists();
mVelocityTracker.addMovement( ev );
final int action = ev.getAction();
switch ( action & MotionEvent.ACTION_MASK ) {
case MotionEvent.ACTION_DOWN: { // DOWN
if ( getChildCount() == 0 ) {
return false;
}
if ( ( mIsBeingDragged = !mFlingRunnable.isFinished() ) ) {
final ViewParent parent = getParent();
if ( parent != null ) {
parent.requestDisallowInterceptTouchEvent( true );
}
}
/*
* If being flinged and user touches, stop the fling. isFinished will be false if being flinged.
*/
if ( !mFlingRunnable.isFinished() ) {
mFlingRunnable.stop( false );
}
// Remember where the motion event started
mTestDragX = ev.getX();
mTestDragY = ev.getY();
mLastMotionX2 = mLastMotionX = (int) ev.getX();
mActivePointerId = ev.getPointerId( 0 );
break;
}
case MotionEvent.ACTION_MOVE: {
// MOVE
final int activePointerIndex = ev.findPointerIndex( mActivePointerId );
final int x = (int) ev.getX( activePointerIndex );
final int y = (int) ev.getY( activePointerIndex );
int deltaX = mLastMotionX - x;
if ( !mIsBeingDragged && Math.abs( deltaX ) > mTouchSlop ) {
final ViewParent parent = getParent();
if ( parent != null ) {
parent.requestDisallowInterceptTouchEvent( true );
}
mIsBeingDragged = true;
if ( deltaX > 0 ) {
deltaX -= mTouchSlop;
} else {
deltaX += mTouchSlop;
}
postScrollNotifier();
}
// first check if we can drag the item
if ( checkDrag( x, y ) ) {
return false;
}
if ( mIsBeingDragged ) {
// Scroll to follow the motion event
mLastMotionX = x;
final float deltaX2 = mLastMotionX2 - x;
final int oldX = getScrollX();
final int range = getScrollRange();
final int overscrollMode = mOverScrollMode;
final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || ( overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0 );
if ( overScrollingBy( deltaX, 0, mCurrentX, 0, range, 0, 0, mOverscrollDistance, true ) ) {
mVelocityTracker.clear();
}
if ( canOverscroll && mEdgeGlowLeft != null ) {
final int pulledToX = oldX + deltaX;
if ( pulledToX < mMinX ) {
float overscroll = ( (float) -deltaX2 * 1.5f ) / getWidth();
mEdgeGlowLeft.onPull( overscroll );
if ( !mEdgeGlowRight.isFinished() ) {
mEdgeGlowRight.onRelease();
}
} else if ( pulledToX > mMaxX ) {
float overscroll = ( (float) deltaX2 * 1.5f ) / getWidth();
mEdgeGlowRight.onPull( overscroll );
if ( !mEdgeGlowLeft.isFinished() ) {
mEdgeGlowLeft.onRelease();
}
}
if ( mEdgeGlowLeft != null && ( !mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished() ) ) {
postInvalidate();
}
}
}
break;
}
case MotionEvent.ACTION_UP: {
if ( mIsBeingDragged ) {
final VelocityTracker velocityTracker = mVelocityTracker;
velocityTracker.computeCurrentVelocity( 1000, mMaximumVelocity );
final float velocityY = velocityTracker.getYVelocity();
final float velocityX = velocityTracker.getXVelocity();
if ( getChildCount() > 0 ) {
if ( ( Math.abs( velocityX ) > mMinimumVelocity ) ) {
onFling( ev, null, velocityX, velocityY );
} else {
if ( mFlingRunnable.springBack( mCurrentX, 0, mMinX, mMaxX, 0, 0 ) ) {
postInvalidate();
}
}
}
mActivePointerId = INVALID_POINTER;
endDrag();
mCanCheckDrag = false;
if ( mFlingRunnable.isFinished() ) {
scrollIntoSlots();
}
}
break;
}
case MotionEvent.ACTION_CANCEL: {
if ( mIsBeingDragged && getChildCount() > 0 ) {
if ( mFlingRunnable.springBack( mCurrentX, 0, mMinX, mMaxX, 0, 0 ) ) {
postInvalidate();
}
mActivePointerId = INVALID_POINTER;
endDrag();
}
break;
}
case MotionEvent.ACTION_POINTER_UP: {
onSecondaryPointerUp( ev );
mLastMotionX2 = mLastMotionX = (int) ev.getX( ev.findPointerIndex( mActivePointerId ) );
mTestDragY = -1;
mTestDragX = -1;
break;
}
}
return true;
}
private void onSecondaryPointerUp( MotionEvent ev ) {
final int pointerIndex = ( ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK ) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId( pointerIndex );
if ( pointerId == mActivePointerId ) {
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionX2 = mLastMotionX = (int) ev.getX( newPointerIndex );
mTestDragY = -1;
mTestDragX = -1;
mActivePointerId = ev.getPointerId( newPointerIndex );
if ( mVelocityTracker != null ) {
mVelocityTracker.clear();
}
}
}
/**
* Check if the movement will fire a drag start event
*
* @param x
* @param y
* @return
*/
private boolean checkDrag( int x, int y ) {
if ( mCanCheckDrag && !mIsDragging ) {
if( mTestDragX < 0 || mTestDragY < 0 ) return false;
float dx = Math.abs( x - mTestDragX );
if ( dx > mDragTolerance ) {
mTestDragY = -1;
mCanCheckDrag = false;
} else {
float dy = Math.abs( y - mTestDragY );
if ( dy > ( (double) mDragTolerance * 1.5 ) ) {
if ( mOriginalDragItem != null && mAdapter != null ) {
View view = mOriginalDragItem.get();
int position = getItemIndex( view );
if ( null != view && position > -1 ) {
getParent().requestDisallowInterceptTouchEvent( false );
if ( mItemDragListener != null ) {
fireItemDragStart( view, mLeftViewIndex + 1 + position, mAdapter.getItemId( mLeftViewIndex + 1 + position ) );
return true;
}
}
}
mCanCheckDrag = false;
}
}
}
return false;
}
private void endDrag() {
mIsBeingDragged = false;
recycleVelocityTracker();
if ( mEdgeGlowLeft != null ) {
mEdgeGlowLeft.onRelease();
mEdgeGlowRight.onRelease();
}
}
/**
* Scroll the view with standard behavior for scrolling beyond the normal content boundaries. Views that call this method should
* override {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the results of an over-scroll operation.
*
* Views can use this method to handle any touch or fling-based scrolling.
*
* @param deltaX
* Change in X in pixels
* @param deltaY
* Change in Y in pixels
* @param scrollX
* Current X scroll value in pixels before applying deltaX
* @param scrollY
* Current Y scroll value in pixels before applying deltaY
* @param scrollRangeX
* Maximum content scroll range along the X axis
* @param scrollRangeY
* Maximum content scroll range along the Y axis
* @param maxOverScrollX
* Number of pixels to overscroll by in either direction along the X axis.
* @param maxOverScrollY
* Number of pixels to overscroll by in either direction along the Y axis.
* @param isTouchEvent
* true if this scroll operation is the result of a touch event.
* @return true if scrolling was clamped to an over-scroll boundary along either axis, false otherwise.
*/
protected boolean overScrollingBy( int deltaX, int deltaY, int scrollX, int scrollY, int scrollRangeX, int scrollRangeY, int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent ) {
final int overScrollMode = mOverScrollMode;
final boolean toLeft = deltaX > 0;
final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS;
int newScrollX = scrollX + deltaX;
if ( !overScrollHorizontal ) {
maxOverScrollX = 0;
}
// Clamp values if at the limits and record
final int left = mMinX - maxOverScrollX;
final int right = mMaxX == Integer.MAX_VALUE ? mMaxX : ( mMaxX + maxOverScrollX );
boolean clampedX = false;
if ( newScrollX > right && toLeft ) {
newScrollX = right;
deltaX = mMaxX - scrollX;
clampedX = true;
} else if ( newScrollX < left && !toLeft ) {
newScrollX = left;
deltaX = mMinX - scrollX;
clampedX = true;
}
onScrolling( newScrollX, deltaX, clampedX );
return clampedX;
}
public boolean onScrolling( int scrollX, int deltaX, boolean clampedX ) {
if ( mAdapter == null ) return true;
if ( !mFlingRunnable.isFinished() ) {
mCurrentX = getScrollX();
if ( clampedX ) {
mFlingRunnable.springBack( scrollX, 0, mMinX, mMaxX, 0, 0 );
}
} else {
trackMotionScroll( scrollX );
}
return true;
}
@Override
public void computeScroll() {
if ( mFlingRunnable.computeScrollOffset() ) {
int oldX = mCurrentX;
int x = mFlingRunnable.getCurrX();
if ( oldX != x ) {
final int range = getScrollRange();
final int overscrollMode = mOverScrollMode;
final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || ( overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0 );
overScrollingBy( x - oldX, 0, oldX, 0, range, 0, mOverscrollDistance, 0, false );
if ( canOverscroll && mEdgeGlowLeft != null ) {
if ( x < 0 && oldX >= 0 ) {
mEdgeGlowLeft.onAbsorb( (int) mFlingRunnable.getCurrVelocity() );
} else if ( x > range && oldX <= range ) {
mEdgeGlowRight.onAbsorb( (int) mFlingRunnable.getCurrVelocity() );
}
}
}
postInvalidate();
}
}
int getScrollRange() {
if ( getChildCount() > 0 ) {
return mMaxX - mMinX;
}
return 0;
}
/** The m animation duration. */
int mAnimationDuration = 400;
/** The m child height. */
int mMaxX, mMinX, mChildHeight;
/** The m should stop fling. */
boolean mShouldStopFling;
/** The m to left. */
boolean mToLeft;
/** The m current x. */
int mCurrentX = 0;
/** The m old x. */
int mOldX = 0;
/** The m touch slop. */
int mTouchSlop;
int mEdgesHeight = -1;
int mEdgesGravityY = Gravity.CENTER;
@Override
public void scrollIntoSlots() {
if ( !mFlingRunnable.isFinished() ) {
return;
}
// boolean greater_enough = mItemCount * ( mChildWidth ) > getWidth();
if ( mCurrentX > mMaxX || mCurrentX < mMinX ) {
if ( mCurrentX > mMaxX ) {
if ( mMaxX < 0 ) {
mFlingRunnable.startUsingDistance( mCurrentX, mMinX - mCurrentX );
} else {
mFlingRunnable.startUsingDistance( mCurrentX, mMaxX - mCurrentX );
}
return;
} else {
mFlingRunnable.startUsingDistance( mCurrentX, mMinX - mCurrentX );
return;
}
}
onFinishedMovement();
}
/**
* On finished movement.
*/
protected void onFinishedMovement() {
Log.d( LOG_TAG, "onFinishedMovement" );
}
private void onItemClick( View child, int position ) {
boolean clickValid = true;
// always dispatch the item click listener
if ( mOnItemClicked != null ) {
playSoundEffect( SoundEffectConstants.CLICK );
clickValid = mOnItemClicked.onItemClick( this, child, position, mAdapter.getItemId( position ) );
}
if( clickValid ) {
// now check the selected status
if ( position != mSelectedPositionInt ) {
setSelectedItem( child, position );
if ( mOnItemSelected != null ) {
mOnItemSelected.onItemSelected( this, child, position, mAdapter.getItemId( position ) );
}
} else {
setSelectedItem( null, INVALID_POSITION );
if ( mOnItemSelected != null ) {
mOnItemSelected.onNothingSelected( this );
}
}
}
}
protected void setSelectedItem( final View newView, final int position ) {
if( mSelectedPositionView != null ) {
mSelectedPositionView.setSelected( false );
}
mSelectedPositionInt = position;
mSelectedPositionView = null;
if( newView != null ) {
mSelectedPositionView = newView;
newView.setSelected( true );
}
}
/** The m gesture listener. */
private OnGestureListener mGestureListener = new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onDoubleTap( MotionEvent e ) {
return false;
};
public boolean onSingleTapUp( MotionEvent e ) {
return onItemClick( e );
};
@Override
public boolean onDown( MotionEvent e ) {
return false;
// return HorizontalFixedListView.this.onDown( e );
};
@Override
public boolean onFling( MotionEvent e1, MotionEvent e2, float velocityX, float velocityY ) {
return false;
// return HorizontalFixedListView.this.onFling( e1, e2, velocityX, velocityY );
};
@Override
public void onLongPress( MotionEvent e ) {
HorizontalVariableListView.this.onLongPress( e );
};
@Override
public boolean onScroll( MotionEvent e1, MotionEvent e2, float distanceX, float distanceY ) {
return false;
// return HorizontalFixedListView.this.onScroll( e1, e2, distanceX, distanceY );
};
@Override
public void onShowPress( MotionEvent e ) {};
@Override
public boolean onSingleTapConfirmed( MotionEvent e ) {
return true;
}
private boolean onItemClick( MotionEvent ev ) {
if ( !mFlingRunnable.isFinished() || mWasFlinging ) return false;
Rect viewRect = new Rect();
for ( int i = 0; i < getChildCount(); i++ ) {
View child = getChildAt( i );
int left = child.getLeft();
int right = child.getWidth();
int top = child.getTop();
int bottom = child.getBottom();
viewRect.set( left, top, left + right, bottom );
viewRect.offset( -mCurrentX, 0 );
if ( viewRect.contains( (int) ev.getX(), (int) ev.getY() ) ) {
final int position = mLeftViewIndex + 1 + i;
HorizontalVariableListView.this.onItemClick( child, position );
break;
}
}
return true;
}
};
public View getChild( MotionEvent e ) {
Rect viewRect = new Rect();
for ( int i = 0; i < getChildCount(); i++ ) {
View child = getChildAt( i );
int left = child.getLeft();
int right = child.getRight();
int top = child.getTop();
int bottom = child.getBottom();
viewRect.set( left, top, right, bottom );
viewRect.offset( -mCurrentX, 0 );
if ( viewRect.contains( (int) e.getX(), (int) e.getY() ) ) {
return child;
}
}
return null;
}
@Override
public int getMinX() {
return mMinX;
}
@Override
public int getMaxX() {
return Integer.MAX_VALUE;
}
public void setDragTolerance( int value ) {
mDragTolerance = value;
}
public void setGravity( int mode ) {
mAlignMode = mode;
}
public int getGravity() {
return mAlignMode;
}
}