1 /* 2 * Copyright (C) 2017 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.documentsui.selection; 17 18 import static com.android.internal.util.Preconditions.checkArgument; 19 20 import android.annotation.DrawableRes; 21 import android.graphics.Point; 22 import android.graphics.Rect; 23 import android.graphics.drawable.Drawable; 24 import android.support.v7.widget.GridLayoutManager; 25 import android.support.v7.widget.RecyclerView; 26 import android.view.View; 27 28 import com.android.documentsui.selection.BandSelectionHelper.BandHost; 29 30 /** 31 * RecyclerView backed {@link BandHost}. 32 */ 33 public final class DefaultBandHost extends BandHost { 34 35 private final RecyclerView mRecView; 36 private final Drawable mBand; 37 38 private boolean mIsOverlayShown; 39 DefaultBandHost(RecyclerView recView, @DrawableRes int bandOverlayId)40 public DefaultBandHost(RecyclerView recView, @DrawableRes int bandOverlayId) { 41 42 checkArgument(recView != null); 43 44 mRecView = recView; 45 mBand = mRecView.getContext().getTheme().getDrawable(bandOverlayId); 46 47 checkArgument(mBand != null); 48 } 49 50 @Override getAdapterPositionAt(int index)51 public int getAdapterPositionAt(int index) { 52 return mRecView.getChildAdapterPosition(mRecView.getChildAt(index)); 53 } 54 55 @Override addOnScrollListener(RecyclerView.OnScrollListener listener)56 public void addOnScrollListener(RecyclerView.OnScrollListener listener) { 57 mRecView.addOnScrollListener(listener); 58 } 59 60 @Override removeOnScrollListener(RecyclerView.OnScrollListener listener)61 public void removeOnScrollListener(RecyclerView.OnScrollListener listener) { 62 mRecView.removeOnScrollListener(listener); 63 } 64 65 @Override createAbsolutePoint(Point relativePoint)66 public Point createAbsolutePoint(Point relativePoint) { 67 return new Point(relativePoint.x + mRecView.computeHorizontalScrollOffset(), 68 relativePoint.y + mRecView.computeVerticalScrollOffset()); 69 } 70 71 @Override getAbsoluteRectForChildViewAt(int index)72 public Rect getAbsoluteRectForChildViewAt(int index) { 73 final View child = mRecView.getChildAt(index); 74 final Rect childRect = new Rect(); 75 child.getHitRect(childRect); 76 childRect.left += mRecView.computeHorizontalScrollOffset(); 77 childRect.right += mRecView.computeHorizontalScrollOffset(); 78 childRect.top += mRecView.computeVerticalScrollOffset(); 79 childRect.bottom += mRecView.computeVerticalScrollOffset(); 80 return childRect; 81 } 82 83 @Override getChildCount()84 public int getChildCount() { 85 return mRecView.getAdapter().getItemCount(); 86 } 87 88 @Override getVisibleChildCount()89 public int getVisibleChildCount() { 90 return mRecView.getChildCount(); 91 } 92 93 @Override getColumnCount()94 public int getColumnCount() { 95 RecyclerView.LayoutManager layoutManager = mRecView.getLayoutManager(); 96 if (layoutManager instanceof GridLayoutManager) { 97 return ((GridLayoutManager) layoutManager).getSpanCount(); 98 } 99 100 // Otherwise, it is a list with 1 column. 101 return 1; 102 } 103 104 @Override getHeight()105 public int getHeight() { 106 return mRecView.getHeight(); 107 } 108 109 @Override invalidateView()110 public void invalidateView() { 111 mRecView.invalidate(); 112 } 113 114 @Override runAtNextFrame(Runnable r)115 public void runAtNextFrame(Runnable r) { 116 mRecView.postOnAnimation(r); 117 } 118 119 @Override removeCallback(Runnable r)120 public void removeCallback(Runnable r) { 121 mRecView.removeCallbacks(r); 122 } 123 124 @Override scrollBy(int dy)125 public void scrollBy(int dy) { 126 mRecView.scrollBy(0, dy); 127 } 128 129 @Override showBand(Rect rect)130 public void showBand(Rect rect) { 131 mBand.setBounds(rect); 132 133 if (!mIsOverlayShown) { 134 mRecView.getOverlay().add(mBand); 135 } 136 } 137 138 @Override hideBand()139 public void hideBand() { 140 mRecView.getOverlay().remove(mBand); 141 } 142 143 @Override hasView(int pos)144 public boolean hasView(int pos) { 145 return mRecView.findViewHolderForAdapterPosition(pos) != null; 146 } 147 }