public void setDragProgressDelegate(DragProgressDelegate delegate) {
mDragProgressDelegate = delegate;
if (mDragProgressDelegate != null) {
if (!mDragProgressDelegate.progressInActionMode() && mUseAsAdapterViewChild) {
// Set a non null on long click listener to make sure
// ACTION_MOVE and ACTION_UP could be dispatched for the view
// even its parent view is a AdapterView with OnItemClickListener set
if (!mHasExtraLongClickListener) {
setDefaultOnLongClickListener(mDefaultOnLongClickListener);
}
} else if (mDragProgressDelegate.progressInActionMode()) {
// Long click gesture is used for drag detection in onTouchEvent procedure
setLongClickable(false);
// If drag progress in action mode, this view must be used as adapter view child
// Set the value in case that the maintainer of this view forget to call the setter
mUseAsAdapterViewChild = true;
}
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (KLOG) Log.i(TAG, "onTouchEvent");
if (!mDragable || mDragProgressDelegate == null) {
return super.onTouchEvent(event);
}
if (mSelectedInActionMode) {
if (KLOG) Log.i(TAG, "Drag detection procedure in action mode");
}
boolean result = super.onTouchEvent(event);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (KLOG) Log.i(TAG, "ACTION down");
mIsNewDragOp = true;
mDragging = false;
mDragCanceled = false;
if (mSelectedInActionMode || !mDragProgressDelegate.progressInActionMode()) {
mSavedDownTime = System.currentTimeMillis();
result = true;
}
break;
case MotionEvent.ACTION_MOVE:
if (KLOG)
Log.i(
TAG,
"ACTION MOVE"
+ " parent-width: "
+ this.getWidth()
+ " parent-height: "
+ this.getHeight()
+ " touch x: "
+ event.getX()
+ " touch y: "
+ event.getY());
if (mSelectedInActionMode || !mDragProgressDelegate.progressInActionMode()) {
long interval = System.currentTimeMillis() - mSavedDownTime;
if (KLOG) Log.i(TAG, "Interval is: " + interval);
if (interval > DRAG_DECISION_INTERVAL) {
if (mIsNewDragOp) {
prepareDrag();
} else {
if (mDragProgressDelegate != null) {
if (!mDragProgressDelegate.isDragOpDelegated(this)) {
if (KLOG) Log.i(TAG, "Drag is not delegated.");
if (mDragProgressDelegate.isDragPrepared(this) && !mDragging) {
if (KLOG) Log.i(TAG, "Drag is prepared, do drag!");
doDrag(mDragProgressDelegate.generateDragShadow(this));
mDragProgressDelegate.notifyAutoDragStarted(this);
}
} else {
if (KLOG) Log.i(TAG, "Drag is delegated.");
}
} else {
if (!mDragging) {
doDrag(new DragShadowBuilder(this));
}
}
}
}
result = true;
}
break;
case MotionEvent.ACTION_UP:
if (KLOG) Log.i(TAG, "ACTION up");
mIsNewDragOp = true;
if (mSelectedInActionMode || !mDragProgressDelegate.progressInActionMode()) {
long interval = System.currentTimeMillis() - mSavedDownTime;
if (KLOG) Log.i(TAG, "Interval is: " + interval);
if (interval > DRAG_DECISION_INTERVAL) {
if (mDragProgressDelegate != null) {
if (!mDragProgressDelegate.isDragPrepared(this)) {
mDragProgressDelegate.interruptDragPreparation(this);
}
mDragReady = false;
if (KLOG) Log.i(TAG, "revert drag prepartion for action up.");
mDragProgressDelegate.revertDragPreparation(this);
}
} else {
doClick(mSelectedInActionMode);
}
} else {
doClick(mSelectedInActionMode);
}
result = true;
break;
}
if (mSelectedInActionMode) {
return result;
} else {
return super.onTouchEvent(event);
}
}