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/*
* Copyright (C) 2018 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.util.AttributeSet;
import android.view.MotionEvent;
import com.android.launcher3.PagedView;
public class AllAppsPagedView extends PagedView<PersonalWorkSlidingTabStrip> {
final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
public AllAppsPagedView(Context context) {
this(context, null);
}
public AllAppsPagedView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public AllAppsPagedView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected String getCurrentPageDescription() {
// Not necessary, tab-bar already has two tabs with their own descriptions.
return "";
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
mPageIndicator.setScroll(l, mMaxScrollX);
}
@Override
protected void determineScrollingStart(MotionEvent ev) {
float absDeltaX = Math.abs(ev.getX() - getDownMotionX());
float absDeltaY = Math.abs(ev.getY() - getDownMotionY());
if (Float.compare(absDeltaX, 0f) == 0) return;
float slope = absDeltaY / absDeltaX;
float theta = (float) Math.atan(slope);
if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
cancelCurrentPageLongPress();
}
if (theta > MAX_SWIPE_ANGLE) {
return;
} else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
float extraRatio = (float)
Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
} else {
super.determineScrollingStart(ev);
}
}
@Override
public boolean hasOverlappingRendering() {
return false;
}
@Override
protected boolean isVerticalScrollable() {
return false;
}
}
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