/** Call this from a drag source view. */
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (DEBUG) {
Log.d(Launcher.TAG, "DragController.onInterceptTouchEvent " + ev + " mDragging=" + mDragging);
}
final int action = ev.getAction();
if (action == MotionEvent.ACTION_DOWN) {
recordScreenSize();
}
final int screenX = clamp((int) ev.getRawX(), 0, mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0, mDisplayMetrics.heightPixels);
switch (action) {
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_DOWN:
// Remember location of down touch
mMotionDownX = screenX;
mMotionDownY = screenY;
mLastDropTarget = null;
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if (mDragging) {
drop(screenX, screenY);
}
endDrag();
break;
}
return mDragging;
}
/** Stop dragging without dropping. */
public void cancelDrag() {
if (mDragging) {
final int[] coordinates = mCoordinatesTemp;
if (mLastDropTarget != null) {
mLastDropTarget.onDragExit(
mDragSource,
coordinates[0],
coordinates[1],
(int) mTouchOffsetX,
(int) mTouchOffsetY,
mDragView,
mDragInfo);
}
mDragSource.onDropCompleted((View) mLastDropTarget, false);
}
endDrag();
}
/** Call this from a drag source view. */
public boolean onTouchEvent(MotionEvent ev) {
View scrollView = mScrollView;
if (!mDragging) {
return false;
}
final int action = ev.getAction();
final int screenX = clamp((int) ev.getRawX(), 0, mDisplayMetrics.widthPixels);
final int screenY = clamp((int) ev.getRawY(), 0, mDisplayMetrics.heightPixels);
switch (action) {
case MotionEvent.ACTION_DOWN:
// Remember where the motion event started
mMotionDownX = screenX;
mMotionDownY = screenY;
if ((screenX < SCROLL_ZONE)
|| (screenY < Launcher.mScreenHeight - Workspace.workspaceBottom)
|| (screenX > scrollView.getWidth() - SCROLL_ZONE)) {
mScrollState = SCROLL_WAITING_IN_ZONE;
mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY);
} else {
mScrollState = SCROLL_OUTSIDE_ZONE;
}
break;
case MotionEvent.ACTION_MOVE:
// Update the drag view. Don't use the clamped pos here so the
// dragging looks
// like it goes off screen a little, intead of bumping up against
// the edge.
mDragView.move((int) ev.getRawX(), (int) ev.getRawY());
// Drop on someone?
final int[] coordinates = mCoordinatesTemp;
DropTarget dropTarget = findDropTarget(screenX, screenY, coordinates);
if (dropTarget != null) {
if (mLastDropTarget == dropTarget) {
dropTarget.onDragOver(
mDragSource,
coordinates[0],
coordinates[1],
(int) mTouchOffsetX,
(int) mTouchOffsetY,
mDragView,
mDragInfo);
} else {
if (mLastDropTarget != null) {
mLastDropTarget.onDragExit(
mDragSource,
coordinates[0],
coordinates[1],
(int) mTouchOffsetX,
(int) mTouchOffsetY,
mDragView,
mDragInfo);
}
dropTarget.onDragEnter(
mDragSource,
coordinates[0],
coordinates[1],
(int) mTouchOffsetX,
(int) mTouchOffsetY,
mDragView,
mDragInfo);
}
} else {
if (mLastDropTarget != null) {
mLastDropTarget.onDragExit(
mDragSource,
coordinates[0],
coordinates[1],
(int) mTouchOffsetX,
(int) mTouchOffsetY,
mDragView,
mDragInfo);
}
}
mLastDropTarget = dropTarget;
// Scroll, maybe, but not if we're in the delete region.
boolean inDeleteRegion = false;
if (mDeleteRegion != null) {
inDeleteRegion = mDeleteRegion.contains(screenX, screenY);
}
if (!inDeleteRegion
&& screenX < SCROLL_ZONE
&& (screenY < Launcher.mScreenHeight - Workspace.workspaceBottom)) {
if (mScrollState == SCROLL_OUTSIDE_ZONE) {
mScrollState = SCROLL_WAITING_IN_ZONE;
mScrollRunnable.setDirection(SCROLL_LEFT);
mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY);
}
} else if (!inDeleteRegion
&& screenX > scrollView.getWidth() - SCROLL_ZONE
&& (screenY < Launcher.mScreenHeight - Workspace.workspaceBottom)) {
if (mScrollState == SCROLL_OUTSIDE_ZONE) {
mScrollState = SCROLL_WAITING_IN_ZONE;
mScrollRunnable.setDirection(SCROLL_RIGHT);
mHandler.postDelayed(mScrollRunnable, SCROLL_DELAY);
}
} else {
if (mScrollState == SCROLL_WAITING_IN_ZONE) {
mScrollState = SCROLL_OUTSIDE_ZONE;
mScrollRunnable.setDirection(SCROLL_RIGHT);
mHandler.removeCallbacks(mScrollRunnable);
}
}
break;
case MotionEvent.ACTION_UP:
mHandler.removeCallbacks(mScrollRunnable);
if (mDragging) {
drop(screenX, screenY);
}
endDrag();
break;
case MotionEvent.ACTION_CANCEL:
cancelDrag();
}
return true;
}