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/*
* Copyright (C) 2017 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.allapps;
import android.content.Context;
import android.graphics.PointF;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.ViewConfiguration;
import com.android.launcher3.touch.SwipeDetector;
import static android.view.MotionEvent.INVALID_POINTER_ID;
public class InterceptingViewPager extends ViewPager {
private final PointF mDownPos = new PointF();
private final PointF mLastPos = new PointF();
private final int mSlop;
private int mActivePointerId = INVALID_POINTER_ID;
public InterceptingViewPager(@NonNull Context context) {
super(context);
mSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
}
public InterceptingViewPager(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
mSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
boolean result = super.onInterceptTouchEvent(ev);
if (!result) {
switch (ev.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mActivePointerId = ev.getPointerId(0);
mDownPos.set(ev.getX(), ev.getY());
mLastPos.set(mDownPos);
break;
case MotionEvent.ACTION_POINTER_UP:
int ptrIdx = ev.getActionIndex();
int ptrId = ev.getPointerId(ptrIdx);
if (ptrId == mActivePointerId) {
final int newPointerIdx = ptrIdx == 0 ? 1 : 0;
mDownPos.set(
ev.getX(newPointerIdx) - (mLastPos.x - mDownPos.x),
ev.getY(newPointerIdx) - (mLastPos.y - mDownPos.y));
mLastPos.set(ev.getX(newPointerIdx), ev.getY(newPointerIdx));
mActivePointerId = ev.getPointerId(newPointerIdx);
}
break;
case MotionEvent.ACTION_MOVE:
int pointerIndex = ev.findPointerIndex(mActivePointerId);
if (pointerIndex == INVALID_POINTER_ID) {
break;
}
float deltaX = ev.getX() - mDownPos.x;
float deltaY = ev.getY() - mDownPos.y;
if (Math.abs(deltaX) > mSlop && Math.abs(deltaX) > Math.abs(deltaY)) {
return true;
}
mLastPos.set(ev.getX(pointerIndex), ev.getY(pointerIndex));
break;
default:
break;
}
}
return result;
}
}
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