Stevie Kideckel
305 lines
11 KiB
Java
305 lines
11 KiB
Java
/*
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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.widget.picker;
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import android.content.Context;
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import android.graphics.Point;
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import android.util.AttributeSet;
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import android.view.MotionEvent;
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import android.view.View;
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import android.widget.TableLayout;
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import androidx.annotation.Nullable;
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import androidx.recyclerview.widget.LinearLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.RecyclerView.OnItemTouchListener;
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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.R;
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import com.android.launcher3.views.ActivityContext;
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import com.android.launcher3.widget.model.WidgetsListBaseEntry;
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import com.android.launcher3.widget.model.WidgetsListContentEntry;
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import com.android.launcher3.widget.model.WidgetsListHeaderEntry;
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import com.android.launcher3.widget.model.WidgetsListSearchHeaderEntry;
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import com.android.launcher3.widget.picker.SearchAndRecommendationsScrollController.OnContentChangeListener;
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/**
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* The widgets recycler view.
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*/
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public class WidgetsRecyclerView extends BaseRecyclerView implements OnItemTouchListener {
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private WidgetsListAdapter mAdapter;
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private final int mScrollbarTop;
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private final Point mFastScrollerOffset = new Point();
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private boolean mTouchDownOnScroller;
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private HeaderViewDimensionsProvider mHeaderViewDimensionsProvider;
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private int mLastVisibleWidgetContentTableHeight = 0;
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private int mWidgetHeaderHeight = 0;
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private final int mCollapsedHeaderBottomMarginSize;
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@Nullable private OnContentChangeListener mOnContentChangeListener;
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public WidgetsRecyclerView(Context context) {
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this(context, null);
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}
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public WidgetsRecyclerView(Context context, AttributeSet attrs) {
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this(context, attrs, 0);
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}
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public WidgetsRecyclerView(Context context, AttributeSet attrs, int defStyleAttr) {
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// API 21 and below only support 3 parameter ctor.
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super(context, attrs, defStyleAttr);
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mScrollbarTop = getResources().getDimensionPixelSize(R.dimen.dynamic_grid_edge_margin);
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addOnItemTouchListener(this);
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ActivityContext activity = ActivityContext.lookupContext(getContext());
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DeviceProfile grid = activity.getDeviceProfile();
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// The bottom margin used when the header is not expanded.
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mCollapsedHeaderBottomMarginSize =
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getResources().getDimensionPixelSize(R.dimen.widget_list_entry_bottom_margin);
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}
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@Override
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protected void onFinishInflate() {
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super.onFinishInflate();
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// create a layout manager with Launcher's context so that scroll position
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// can be preserved during screen rotation.
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WidgetsListLayoutManager layoutManager = new WidgetsListLayoutManager(getContext());
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layoutManager.setOnContentChangeListener(mOnContentChangeListener);
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setLayoutManager(layoutManager);
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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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mAdapter = (WidgetsListAdapter) adapter;
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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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// Skip early if widgets are not bound.
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if (isModelNotReady()) {
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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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int rowCount = mAdapter.getItemCount();
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float pos = rowCount * touchFraction;
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int availableScrollHeight = getAvailableScrollHeight();
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LinearLayoutManager layoutManager = ((LinearLayoutManager) getLayoutManager());
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layoutManager.scrollToPositionWithOffset(0, (int) -(availableScrollHeight * touchFraction));
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int posInt = (int) ((touchFraction == 1) ? pos - 1 : pos);
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return mAdapter.getSectionName(posInt);
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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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// Skip early if widgets are not bound.
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if (isModelNotReady()) {
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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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synchronizeScrollBarThumbOffsetToViewScroll(scrollY, getAvailableScrollHeight());
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}
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@Override
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public int getCurrentScrollY() {
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// Skip early if widgets are not bound.
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if (isModelNotReady() || getChildCount() == 0) {
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return -1;
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}
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int rowIndex = -1;
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View child = null;
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LayoutManager layoutManager = getLayoutManager();
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if (layoutManager instanceof LinearLayoutManager) {
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// Use the LayoutManager as the source of truth for visible positions. During
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// animations, the view group child may not correspond to the visible views that appear
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// at the top.
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rowIndex = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
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child = layoutManager.findViewByPosition(rowIndex);
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}
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if (child == null) {
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// If the layout manager returns null for any reason, which can happen before layout
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// has occurred for the position, then look at the child of this view as a ViewGroup.
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child = getChildAt(0);
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rowIndex = getChildPosition(child);
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}
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for (int i = 0; i < getChildCount(); i++) {
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View view = getChildAt(i);
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if (view instanceof TableLayout) {
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// This assumes there is ever only one content shown in this recycler view.
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mLastVisibleWidgetContentTableHeight = view.getMeasuredHeight();
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} else if (view instanceof WidgetsListHeader
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&& mLastVisibleWidgetContentTableHeight == 0
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&& view.getMeasuredHeight() > 0) {
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// This assumes all header views are of the same height.
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mWidgetHeaderHeight = view.getMeasuredHeight();
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}
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}
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int scrollPosition = getItemsHeight(rowIndex);
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int offset = getLayoutManager().getDecoratedTop(child);
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return getPaddingTop() + scrollPosition - offset;
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}
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/**
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* Returns the available scroll height, in pixel.
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*
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* <p>If the recycler view can't be scrolled, returns 0.
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*/
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@Override
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protected int getAvailableScrollHeight() {
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// AvailableScrollHeight = Total height of the all items - first page height
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int firstPageHeight = getMeasuredHeight() - getPaddingTop() - getPaddingBottom();
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int totalHeightOfAllItems = getItemsHeight(/* untilIndex= */ mAdapter.getItemCount());
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int availableScrollHeight = totalHeightOfAllItems - firstPageHeight;
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return Math.max(0, availableScrollHeight);
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}
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private boolean isModelNotReady() {
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return mAdapter.getItemCount() == 0;
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}
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@Override
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public int getScrollBarTop() {
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return mHeaderViewDimensionsProvider == null
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? mScrollbarTop
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: mHeaderViewDimensionsProvider.getHeaderViewHeight() + mScrollbarTop;
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}
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@Override
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public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
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if (e.getAction() == MotionEvent.ACTION_DOWN) {
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mTouchDownOnScroller =
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mScrollbar.isHitInParent(e.getX(), e.getY(), mFastScrollerOffset);
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}
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if (mTouchDownOnScroller) {
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final boolean result = mScrollbar.handleTouchEvent(e, mFastScrollerOffset);
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return result;
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}
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return false;
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}
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@Override
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public void onTouchEvent(RecyclerView rv, MotionEvent e) {
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if (mTouchDownOnScroller) {
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mScrollbar.handleTouchEvent(e, mFastScrollerOffset);
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}
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}
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@Override
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public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
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}
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public void setHeaderViewDimensionsProvider(
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HeaderViewDimensionsProvider headerViewDimensionsProvider) {
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mHeaderViewDimensionsProvider = headerViewDimensionsProvider;
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}
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@Override
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public void scrollToTop() {
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if (mScrollbar != null) {
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mScrollbar.reattachThumbToScroll();
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}
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if (getLayoutManager() instanceof LinearLayoutManager) {
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if (getCurrentScrollY() == 0) {
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// We are at the top, so don't scrollToPosition (would cause unnecessary relayout).
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return;
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}
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}
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scrollToPosition(0);
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}
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public void setOnContentChangeListener(@Nullable OnContentChangeListener listener) {
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mOnContentChangeListener = listener;
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WidgetsListLayoutManager layoutManager = (WidgetsListLayoutManager) getLayoutManager();
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if (layoutManager != null) {
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layoutManager.setOnContentChangeListener(listener);
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}
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}
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/**
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* Returns the sum of the height, in pixels, of this list adapter's items from index 0 until
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* {@code untilIndex}.
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*
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* <p>If the untilIndex is larger than the total number of items in this adapter, returns the
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* sum of all items' height.
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*/
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private int getItemsHeight(int untilIndex) {
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if (untilIndex > mAdapter.getItems().size()) {
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untilIndex = mAdapter.getItems().size();
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}
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int expandedHeaderPosition = mAdapter.getSelectedHeaderPosition().orElse(-1);
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int totalItemsHeight = 0;
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for (int i = 0; i < untilIndex; i++) {
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WidgetsListBaseEntry entry = mAdapter.getItems().get(i);
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if (entry instanceof WidgetsListHeaderEntry
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|| entry instanceof WidgetsListSearchHeaderEntry) {
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totalItemsHeight += mWidgetHeaderHeight;
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if (expandedHeaderPosition != i) {
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// If the header is collapsed, include the bottom margin it will use.
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totalItemsHeight += mCollapsedHeaderBottomMarginSize;
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}
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} else if (entry instanceof WidgetsListContentEntry) {
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totalItemsHeight += mLastVisibleWidgetContentTableHeight;
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} else {
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throw new UnsupportedOperationException("Can't estimate height for " + entry);
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}
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}
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return totalItemsHeight;
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}
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/**
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* Provides dimensions of the header view that is shown at the top of a
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* {@link WidgetsRecyclerView}.
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*/
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public interface HeaderViewDimensionsProvider {
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/**
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* Returns the height, in pixels, of the header view that is shown at the top of a
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* {@link WidgetsRecyclerView}.
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*/
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int getHeaderViewHeight();
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}
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}
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