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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.systemui.qs;
import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.ScrollView;
/**
* ScrollView that disallows intercepting for touches that can cause scrolling.
*/
public class NonInterceptingScrollView extends ScrollView {
private float mInitialY;
public NonInterceptingScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
int action = ev.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN:
mInitialY = ev.getY();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
requestDisallowInterceptTouchEvent(false);
break;
default:
if (canScrollVertically(ev.getY() > mInitialY ? -1 : 1)) {
requestDisallowInterceptTouchEvent(true);
}
break;
}
return super.onTouchEvent(ev);
}
}