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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.gecko.widget;
import android.graphics.Rect;
import android.view.MotionEvent;
import android.view.TouchDelegate;
import android.view.View;
import android.view.ViewConfiguration;
/**
* This is a copy of TouchDelegate from
* https://github.com/android/platform_frameworks_base/blob/4b1a8f46d6ec55796bf77fd8921a5a242a219278/core/java/android/view/TouchDelegate.java
* with a fix to reset mDelegateTargeted on each new gesture - the sole substantive change is a new
* else leg in the ACTION_DOWN case of onTouchEvent marked by "START|END BUG FIX" comments.
*/
/**
* Helper class to handle situations where you want a view to have a larger touch area than its
* actual view bounds. The view whose touch area is changed is called the delegate view. This
* class should be used by an ancestor of the delegate. To use a TouchDelegate, first create an
* instance that specifies the bounds that should be mapped to the delegate and the delegate
* view itself.
* <p>
* The ancestor should then forward all of its touch events received in its
* {@link android.view.View#onTouchEvent(MotionEvent)} to {@link #onTouchEvent(MotionEvent)}.
* </p>
*/
public class TouchDelegateWithReset extends TouchDelegate {
/**
* View that should receive forwarded touch events
*/
private View mDelegateView;
/**
* Bounds in local coordinates of the containing view that should be mapped to the delegate
* view. This rect is used for initial hit testing.
*/
private Rect mBounds;
/**
* mBounds inflated to include some slop. This rect is to track whether the motion events
* should be considered to be be within the delegate view.
*/
private Rect mSlopBounds;
/**
* True if the delegate had been targeted on a down event (intersected mBounds).
*/
private boolean mDelegateTargeted;
private int mSlop;
/**
* Constructor
*
* @param bounds Bounds in local coordinates of the containing view that should be mapped to
* the delegate view
* @param delegateView The view that should receive motion events
*/
public TouchDelegateWithReset(Rect bounds, View delegateView) {
super(bounds, delegateView);
mBounds = bounds;
mSlop = ViewConfiguration.get(delegateView.getContext()).getScaledTouchSlop();
mSlopBounds = new Rect(bounds);
mSlopBounds.inset(-mSlop, -mSlop);
mDelegateView = delegateView;
}
/**
* Will forward touch events to the delegate view if the event is within the bounds
* specified in the constructor.
*
* @param event The touch event to forward
* @return True if the event was forwarded to the delegate, false otherwise.
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int)event.getX();
int y = (int)event.getY();
boolean sendToDelegate = false;
boolean hit = true;
boolean handled = false;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Rect bounds = mBounds;
if (bounds.contains(x, y)) {
mDelegateTargeted = true;
sendToDelegate = true;
} /* START BUG FIX */
else {
mDelegateTargeted = false;
}
/* END BUG FIX */
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_MOVE:
sendToDelegate = mDelegateTargeted;
if (sendToDelegate) {
Rect slopBounds = mSlopBounds;
if (!slopBounds.contains(x, y)) {
hit = false;
}
}
break;
case MotionEvent.ACTION_CANCEL:
sendToDelegate = mDelegateTargeted;
mDelegateTargeted = false;
break;
}
if (sendToDelegate) {
final View delegateView = mDelegateView;
if (hit) {
// Offset event coordinates to be inside the target view
event.setLocation(delegateView.getWidth() / 2, delegateView.getHeight() / 2);
} else {
// Offset event coordinates to be outside the target view (in case it does
// something like tracking pressed state)
int slop = mSlop;
event.setLocation(-(slop * 2), -(slop * 2));
}
handled = delegateView.dispatchTouchEvent(event);
}
return handled;
}
}
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