/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.launcher3.allapps;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import com.android.launcher3.PagedView;
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public class AllAppsPagedView extends PagedView<PersonalWorkSlidingTabStrip> {
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final static float START_DAMPING_TOUCH_SLOP_ANGLE = (float) Math.PI / 6;
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final static float MAX_SWIPE_ANGLE = (float) Math.PI / 3;
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final static float TOUCH_SLOP_DAMPING_FACTOR = 4;
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public AllAppsPagedView(Context context) {
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this(context, null);
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}
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public AllAppsPagedView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public AllAppsPagedView(Context context, AttributeSet attrs, int defStyle) {
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super(context, attrs, defStyle);
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}
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@Override
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protected String getCurrentPageDescription() {
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// Not necessary, tab-bar already has two tabs with their own descriptions.
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return "";
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}
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@Override
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protected void onScrollChanged(int l, int t, int oldl, int oldt) {
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super.onScrollChanged(l, t, oldl, oldt);
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mPageIndicator.setScroll(l, mMaxScrollX);
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}
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@Override
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protected void determineScrollingStart(MotionEvent ev) {
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float absDeltaX = Math.abs(ev.getX() - getDownMotionX());
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float absDeltaY = Math.abs(ev.getY() - getDownMotionY());
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if (Float.compare(absDeltaX, 0f) == 0) return;
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float slope = absDeltaY / absDeltaX;
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float theta = (float) Math.atan(slope);
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if (absDeltaX > mTouchSlop || absDeltaY > mTouchSlop) {
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cancelCurrentPageLongPress();
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}
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if (theta > MAX_SWIPE_ANGLE) {
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return;
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} else if (theta > START_DAMPING_TOUCH_SLOP_ANGLE) {
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theta -= START_DAMPING_TOUCH_SLOP_ANGLE;
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float extraRatio = (float)
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Math.sqrt((theta / (MAX_SWIPE_ANGLE - START_DAMPING_TOUCH_SLOP_ANGLE)));
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super.determineScrollingStart(ev, 1 + TOUCH_SLOP_DAMPING_FACTOR * extraRatio);
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} else {
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super.determineScrollingStart(ev);
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}
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}
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@Override
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public boolean hasOverlappingRendering() {
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return false;
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}
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}
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