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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.view.View;
import android.view.ViewConfiguration;
import android.view.ViewParent;
import android.widget.ScrollView;
/**
* ScrollView that disallows intercepting for touches that can cause scrolling.
*/
public class NonInterceptingScrollView extends ScrollView {
private final int mTouchSlop;
private float mDownY;
private boolean mScrollEnabled = true;
public NonInterceptingScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
int action = ev.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN:
if (canScrollVertically(1)) {
// If we can scroll down, make sure we're not intercepted by the parent
final ViewParent parent = getParent();
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
} else if (!canScrollVertically(-1)) {
// Don't pass on the touch to the view, because scrolling will unconditionally
// disallow interception even if we can't scroll.
// if a user can't scroll at all, we should never listen to the touch.
return false;
}
break;
}
return super.onTouchEvent(ev);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
// If there's a touch on this view and we can scroll down, we don't want to be intercepted
int action = ev.getActionMasked();
switch (action) {
case MotionEvent.ACTION_DOWN:
// If we can scroll down, make sure non of our parents intercepts us.
if (canScrollVertically(1)) {
final ViewParent parent = getParent();
if (parent != null) {
parent.requestDisallowInterceptTouchEvent(true);
}
}
mDownY = ev.getY();
break;
case MotionEvent.ACTION_MOVE: {
final int y = (int) ev.getY();
final float yDiff = y - mDownY;
if (yDiff < -mTouchSlop && !canScrollVertically(1)) {
// Don't intercept touches that are overscrolling.
return false;
}
break;
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean canScrollVertically(int direction) {
return mScrollEnabled && super.canScrollVertically(direction);
}
@Override
public boolean canScrollHorizontally(int direction) {
return mScrollEnabled && super.canScrollHorizontally(direction);
}
public int getScrollRange() {
int scrollRange = 0;
if (getChildCount() > 0) {
View child = getChildAt(0);
scrollRange = Math.max(0,
child.getHeight() - (getHeight() - mPaddingBottom - mPaddingTop));
}
return scrollRange;
}
/**
* Enable scrolling for this view. Needed because the view might be clipped but still intercepts
* touches on the lockscreen.
*/
public void setScrollingEnabled(boolean enabled) {
mScrollEnabled = enabled;
}
}
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