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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3.util;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.MotionEvent;
import android.view.TouchDelegate;
import android.view.View;
/**
* This class differs from the framework {@link TouchDelegate} in that it transforms the
* coordinates of the motion event to the provided bounds.
*
* You can also modify the bounds post construction. Since the bounds are available during layout,
* this avoids new object creation during every layout.
*/
public class TransformingTouchDelegate extends TouchDelegate {
private static final Rect sTempRect = new Rect();
private final RectF mBounds;
private View mDelegateView;
private boolean mDelegateTargeted;
public TransformingTouchDelegate(View delegateView) {
super(sTempRect, delegateView);
mDelegateView = delegateView;
mBounds = new RectF();
}
public void setBounds(int left, int top, int right, int bottom) {
mBounds.set(left, top, right, bottom);
}
public void setDelegateView(View view) {
mDelegateView = view;
}
/**
* 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.
*/
public boolean onTouchEvent(MotionEvent event) {
boolean sendToDelegate = false;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
mDelegateTargeted = mBounds.contains(event.getX(), event.getY());
if (mDelegateTargeted) {
sendToDelegate = true;
}
break;
case MotionEvent.ACTION_MOVE:
sendToDelegate = mDelegateTargeted;
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
sendToDelegate = mDelegateTargeted;
mDelegateTargeted = false;
break;
}
boolean handled = false;
if (sendToDelegate) {
event.offsetLocation(-mBounds.left, -mBounds.top);
handled = mDelegateView.dispatchTouchEvent(event);
event.offsetLocation(mBounds.left, mBounds.top);
}
return handled;
}
}
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