@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downX = tempX = (int) event.getRawX();
downY = (int) event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
int moveX = (int) event.getRawX();
int deltaX = tempX - moveX;
tempX = moveX;
if (Math.abs(moveX - downX) > mTouchSlop
&& Math.abs((int) event.getRawY() - downY) < mTouchSlop) {
isSilding = true;
if (isTouchOnAbsListView()) {
MotionEvent cancelEvent = MotionEvent.obtain(event);
cancelEvent.setAction(
MotionEvent.ACTION_CANCEL
| (event.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));
v.onTouchEvent(cancelEvent);
}
}
if (moveX - downX >= 0 && isSilding) {
mParentView.scrollBy(deltaX, 0);
if (isTouchOnScrollView() || isTouchOnAbsListView()) {
return true;
}
}
break;
case MotionEvent.ACTION_UP:
isSilding = false;
if (mParentView.getScrollX() <= -viewWidth / 2) {
isFinish = true;
scrollRight();
} else {
scrollOrigin();
isFinish = false;
}
break;
}
if (isTouchOnScrollView() || isTouchOnAbsListView()) {
return v.onTouchEvent(event);
}
return true;
}
private DropTarget findDropTarget(ViewGroup container, int x, int y, int[] dropCoordinates) {
final Rect r = mDragRect;
final int count = container.getChildCount();
final int scrolledX = x + container.getScrollX();
final int scrolledY = y + container.getScrollY();
final View ignoredDropTarget = mIgnoredDropTarget;
for (int i = count - 1; i >= 0; i--) {
final View child = container.getChildAt(i);
if (child.getVisibility() == VISIBLE && child != ignoredDropTarget) {
child.getHitRect(r);
if (r.contains(scrolledX, scrolledY)) {
DropTarget target = null;
if (child instanceof ViewGroup) {
x = scrolledX - child.getLeft();
y = scrolledY - child.getTop();
target = findDropTarget((ViewGroup) child, x, y, dropCoordinates);
}
if (target == null) {
if (child instanceof DropTarget) {
// Only consider this child if they will accept
DropTarget childTarget = (DropTarget) child;
if (childTarget.acceptDrop(mDragSource, x, y, 0, 0, mDragInfo)) {
dropCoordinates[0] = x;
dropCoordinates[1] = y;
return (DropTarget) child;
} else {
return null;
}
}
} else {
return target;
}
}
}
}
return null;
}
public static boolean isTransformedPointInView(
ViewGroup parent, View child, float x, float y, @Nullable PointF outLocalPoint) {
Util.throwIfNull(parent);
Util.throwIfNull(child);
float localX = x + parent.getScrollX() - child.getLeft();
float localY = y + parent.getScrollY() - child.getTop();
// TODO: handle transforms
/*Matrix childMatrix = child.getMatrix();
if (!childMatrix.isIdentity()) {
final float[] localXY = new float[2];
localXY[0] = localX;
localXY[1] = localY;
child.getInverseMatrix
}*/
final boolean isInView = ViewUtil.pointInView(child, localX, localY);
if (isInView && outLocalPoint != null) {
outLocalPoint.set(localX, localY);
}
return isInView;
}
private void scrollOrigin() {
int delta = mParentView.getScrollX();
mScroller.startScroll(mParentView.getScrollX(), 0, -delta, 0, Math.abs(delta));
postInvalidate();
}
private void scrollRight() {
final int delta = (viewWidth + mParentView.getScrollX());
mScroller.startScroll(mParentView.getScrollX(), 0, -delta + 1, 0, Math.abs(delta));
postInvalidate();
}