/*
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* Copyright (C) 2015 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 static android.view.View.MeasureSpec.UNSPECIFIED;
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import android.content.Context;
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import android.content.res.Resources;
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import android.graphics.Canvas;
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import android.graphics.drawable.Drawable;
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import android.util.AttributeSet;
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import android.util.SparseIntArray;
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import android.view.MotionEvent;
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import android.view.View;
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import com.android.launcher3.BaseRecyclerView;
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import com.android.launcher3.DeviceProfile;
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import com.android.launcher3.ItemInfo;
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import com.android.launcher3.Launcher;
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import com.android.launcher3.LauncherAppState;
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import com.android.launcher3.R;
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import com.android.launcher3.Utilities;
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import com.android.launcher3.compat.AccessibilityManagerCompat;
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import com.android.launcher3.logging.StatsLogUtils.LogContainerProvider;
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import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
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import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
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import com.android.launcher3.views.RecyclerViewFastScroller;
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import java.util.List;
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import androidx.recyclerview.widget.RecyclerView;
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/**
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* A RecyclerView with custom fast scroll support for the all apps view.
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*/
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public class AllAppsRecyclerView extends BaseRecyclerView implements LogContainerProvider {
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private AlphabeticalAppsList mApps;
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private AllAppsFastScrollHelper mFastScrollHelper;
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private final int mNumAppsPerRow;
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// The specific view heights that we use to calculate scroll
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private SparseIntArray mViewHeights = new SparseIntArray();
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private SparseIntArray mCachedScrollPositions = new SparseIntArray();
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// The empty-search result background
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private AllAppsBackgroundDrawable mEmptySearchBackground;
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private int mEmptySearchBackgroundTopOffset;
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public AllAppsRecyclerView(Context context) {
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this(context, null);
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}
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public AllAppsRecyclerView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public AllAppsRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) {
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this(context, attrs, defStyleAttr, 0);
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}
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public AllAppsRecyclerView(Context context, AttributeSet attrs, int defStyleAttr,
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int defStyleRes) {
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super(context, attrs, defStyleAttr);
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Resources res = getResources();
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mEmptySearchBackgroundTopOffset = res.getDimensionPixelSize(
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R.dimen.all_apps_empty_search_bg_top_offset);
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mNumAppsPerRow = LauncherAppState.getIDP(context).numColumns;
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}
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/**
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* Sets the list of apps in this view, used to determine the fastscroll position.
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*/
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public void setApps(AlphabeticalAppsList apps, boolean usingTabs) {
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mApps = apps;
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mFastScrollHelper = new AllAppsFastScrollHelper(this, apps);
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}
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public AlphabeticalAppsList getApps() {
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return mApps;
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}
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private void updatePoolSize() {
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DeviceProfile grid = Launcher.getLauncher(getContext()).getDeviceProfile();
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RecyclerView.RecycledViewPool pool = getRecycledViewPool();
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int approxRows = (int) Math.ceil(grid.availableHeightPx / grid.allAppsIconSizePx);
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pool.setMaxRecycledViews(AllAppsGridAdapter.VIEW_TYPE_EMPTY_SEARCH, 1);
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pool.setMaxRecycledViews(AllAppsGridAdapter.VIEW_TYPE_ALL_APPS_DIVIDER, 1);
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pool.setMaxRecycledViews(AllAppsGridAdapter.VIEW_TYPE_SEARCH_MARKET, 1);
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pool.setMaxRecycledViews(AllAppsGridAdapter.VIEW_TYPE_ICON, approxRows * mNumAppsPerRow);
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mViewHeights.clear();
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mViewHeights.put(AllAppsGridAdapter.VIEW_TYPE_ICON, grid.allAppsCellHeightPx);
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}
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/**
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* Scrolls this recycler view to the top.
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*/
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public void scrollToTop() {
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// Ensure we reattach the scrollbar if it was previously detached while fast-scrolling
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if (mScrollbar != null) {
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mScrollbar.reattachThumbToScroll();
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}
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scrollToPosition(0);
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}
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@Override
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public void onDraw(Canvas c) {
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// Draw the background
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if (mEmptySearchBackground != null && mEmptySearchBackground.getAlpha() > 0) {
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mEmptySearchBackground.draw(c);
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}
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super.onDraw(c);
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}
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@Override
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protected boolean verifyDrawable(Drawable who) {
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return who == mEmptySearchBackground || super.verifyDrawable(who);
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}
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@Override
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protected void onSizeChanged(int w, int h, int oldw, int oldh) {
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updateEmptySearchBackgroundBounds();
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updatePoolSize();
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}
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@Override
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public void fillInLogContainerData(View v, ItemInfo info, Target target, Target targetParent) {
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if (mApps.hasFilter()) {
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targetParent.containerType = ContainerType.SEARCHRESULT;
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} else {
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targetParent.containerType = ContainerType.ALLAPPS;
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}
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}
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public void onSearchResultsChanged() {
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// Always scroll the view to the top so the user can see the changed results
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scrollToTop();
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if (mApps.hasNoFilteredResults()) {
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if (mEmptySearchBackground == null) {
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mEmptySearchBackground = new AllAppsBackgroundDrawable(getContext());
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mEmptySearchBackground.setAlpha(0);
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mEmptySearchBackground.setCallback(this);
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updateEmptySearchBackgroundBounds();
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}
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mEmptySearchBackground.animateBgAlpha(1f, 150);
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} else if (mEmptySearchBackground != null) {
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// For the time being, we just immediately hide the background to ensure that it does
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// not overlap with the results
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mEmptySearchBackground.setBgAlpha(0f);
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}
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}
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@Override
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public boolean onInterceptTouchEvent(MotionEvent e) {
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boolean result = super.onInterceptTouchEvent(e);
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if (!result && e.getAction() == MotionEvent.ACTION_DOWN
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&& mEmptySearchBackground != null && mEmptySearchBackground.getAlpha() > 0) {
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mEmptySearchBackground.setHotspot(e.getX(), e.getY());
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}
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return result;
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}
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/**
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* Maps the touch (from 0..1) to the adapter position that should be visible.
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*/
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@Override
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public String scrollToPositionAtProgress(float touchFraction) {
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int rowCount = mApps.getNumAppRows();
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if (rowCount == 0) {
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return "";
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}
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// Stop the scroller if it is scrolling
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stopScroll();
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// Find the fastscroll section that maps to this touch fraction
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List<AlphabeticalAppsList.FastScrollSectionInfo> fastScrollSections =
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mApps.getFastScrollerSections();
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AlphabeticalAppsList.FastScrollSectionInfo lastInfo = fastScrollSections.get(0);
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for (int i = 1; i < fastScrollSections.size(); i++) {
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AlphabeticalAppsList.FastScrollSectionInfo info = fastScrollSections.get(i);
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if (info.touchFraction > touchFraction) {
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break;
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}
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lastInfo = info;
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}
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// Update the fast scroll
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int scrollY = getCurrentScrollY();
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int availableScrollHeight = getAvailableScrollHeight();
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mFastScrollHelper.smoothScrollToSection(scrollY, availableScrollHeight, lastInfo);
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return lastInfo.sectionName;
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}
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@Override
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public void onFastScrollCompleted() {
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super.onFastScrollCompleted();
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mFastScrollHelper.onFastScrollCompleted();
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}
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@Override
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public void setAdapter(Adapter adapter) {
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super.setAdapter(adapter);
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adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
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public void onChanged() {
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mCachedScrollPositions.clear();
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}
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});
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mFastScrollHelper.onSetAdapter((AllAppsGridAdapter) adapter);
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}
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@Override
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protected float getBottomFadingEdgeStrength() {
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// No bottom fading edge.
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return 0;
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}
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@Override
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protected boolean isPaddingOffsetRequired() {
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return true;
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}
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@Override
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protected int getTopPaddingOffset() {
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return -getPaddingTop();
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}
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/**
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* Updates the bounds for the scrollbar.
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*/
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@Override
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public void onUpdateScrollbar(int dy) {
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if (mApps == null) {
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return;
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}
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List<AlphabeticalAppsList.AdapterItem> items = mApps.getAdapterItems();
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// Skip early if there are no items or we haven't been measured
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if (items.isEmpty() || mNumAppsPerRow == 0) {
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mScrollbar.setThumbOffsetY(-1);
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return;
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}
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// Skip early if, there no child laid out in the container.
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int scrollY = getCurrentScrollY();
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if (scrollY < 0) {
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mScrollbar.setThumbOffsetY(-1);
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return;
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}
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// Only show the scrollbar if there is height to be scrolled
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int availableScrollBarHeight = getAvailableScrollBarHeight();
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int availableScrollHeight = getAvailableScrollHeight();
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if (availableScrollHeight <= 0) {
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mScrollbar.setThumbOffsetY(-1);
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return;
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}
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if (mScrollbar.isThumbDetached()) {
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if (!mScrollbar.isDraggingThumb()) {
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// Calculate the current scroll position, the scrollY of the recycler view accounts
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// for the view padding, while the scrollBarY is drawn right up to the background
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// padding (ignoring padding)
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int scrollBarY = (int)
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(((float) scrollY / availableScrollHeight) * availableScrollBarHeight);
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int thumbScrollY = mScrollbar.getThumbOffsetY();
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int diffScrollY = scrollBarY - thumbScrollY;
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if (diffScrollY * dy > 0f) {
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// User is scrolling in the same direction the thumb needs to catch up to the
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// current scroll position. We do this by mapping the difference in movement
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// from the original scroll bar position to the difference in movement necessary
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// in the detached thumb position to ensure that both speed towards the same
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// position at either end of the list.
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if (dy < 0) {
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int offset = (int) ((dy * thumbScrollY) / (float) scrollBarY);
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thumbScrollY += Math.max(offset, diffScrollY);
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} else {
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int offset = (int) ((dy * (availableScrollBarHeight - thumbScrollY)) /
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(float) (availableScrollBarHeight - scrollBarY));
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thumbScrollY += Math.min(offset, diffScrollY);
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}
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thumbScrollY = Math.max(0, Math.min(availableScrollBarHeight, thumbScrollY));
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mScrollbar.setThumbOffsetY(thumbScrollY);
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if (scrollBarY == thumbScrollY) {
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mScrollbar.reattachThumbToScroll();
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}
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} else {
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// User is scrolling in an opposite direction to the direction that the thumb
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// needs to catch up to the scroll position. Do nothing except for updating
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// the scroll bar x to match the thumb width.
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mScrollbar.setThumbOffsetY(thumbScrollY);
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}
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}
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} else {
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synchronizeScrollBarThumbOffsetToViewScroll(scrollY, availableScrollHeight);
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}
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}
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@Override
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public boolean supportsFastScrolling() {
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// Only allow fast scrolling when the user is not searching, since the results are not
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// grouped in a meaningful order
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return !mApps.hasFilter();
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}
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@Override
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public int getCurrentScrollY() {
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// Return early if there are no items or we haven't been measured
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List<AlphabeticalAppsList.AdapterItem> items = mApps.getAdapterItems();
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if (items.isEmpty() || mNumAppsPerRow == 0 || getChildCount() == 0) {
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return -1;
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}
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// Calculate the y and offset for the item
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View child = getChildAt(0);
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int position = getChildPosition(child);
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if (position == NO_POSITION) {
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return -1;
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}
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return getPaddingTop() +
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getCurrentScrollY(position, getLayoutManager().getDecoratedTop(child));
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}
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public int getCurrentScrollY(int position, int offset) {
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List<AlphabeticalAppsList.AdapterItem> items = mApps.getAdapterItems();
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AlphabeticalAppsList.AdapterItem posItem = position < items.size() ?
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items.get(position) : null;
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int y = mCachedScrollPositions.get(position, -1);
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if (y < 0) {
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y = 0;
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for (int i = 0; i < position; i++) {
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AlphabeticalAppsList.AdapterItem item = items.get(i);
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if (AllAppsGridAdapter.isIconViewType(item.viewType)) {
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// Break once we reach the desired row
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if (posItem != null && posItem.viewType == item.viewType &&
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posItem.rowIndex == item.rowIndex) {
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break;
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}
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// Otherwise, only account for the first icon in the row since they are the same
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// size within a row
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if (item.rowAppIndex == 0) {
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y += mViewHeights.get(item.viewType, 0);
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}
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} else {
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// Rest of the views span the full width
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int elHeight = mViewHeights.get(item.viewType);
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if (elHeight == 0) {
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ViewHolder holder = findViewHolderForAdapterPosition(i);
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if (holder == null) {
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holder = getAdapter().createViewHolder(this, item.viewType);
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getAdapter().onBindViewHolder(holder, i);
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holder.itemView.measure(UNSPECIFIED, UNSPECIFIED);
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elHeight = holder.itemView.getMeasuredHeight();
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getRecycledViewPool().putRecycledView(holder);
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} else {
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elHeight = holder.itemView.getMeasuredHeight();
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}
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}
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y += elHeight;
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}
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}
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mCachedScrollPositions.put(position, y);
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}
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return y - offset;
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}
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/**
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* Returns the available scroll height:
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* AvailableScrollHeight = Total height of the all items - last page height
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*/
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@Override
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protected int getAvailableScrollHeight() {
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return getPaddingTop() + getCurrentScrollY(getAdapter().getItemCount(), 0)
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- getHeight() + getPaddingBottom();
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}
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public int getScrollBarTop() {
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return getResources().getDimensionPixelOffset(R.dimen.all_apps_header_top_padding);
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}
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public RecyclerViewFastScroller getScrollbar() {
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return mScrollbar;
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}
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/**
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* Updates the bounds of the empty search background.
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*/
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private void updateEmptySearchBackgroundBounds() {
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if (mEmptySearchBackground == null) {
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return;
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}
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// Center the empty search background on this new view bounds
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int x = (getMeasuredWidth() - mEmptySearchBackground.getIntrinsicWidth()) / 2;
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int y = mEmptySearchBackgroundTopOffset;
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mEmptySearchBackground.setBounds(x, y,
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x + mEmptySearchBackground.getIntrinsicWidth(),
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y + mEmptySearchBackground.getIntrinsicHeight());
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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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@Override
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public void onScrollStateChanged(int state) {
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super.onScrollStateChanged(state);
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if (state == SCROLL_STATE_IDLE) {
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AccessibilityManagerCompat.sendScrollFinishedEventToTest(getContext());
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}
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}
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}
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