Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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 | |
| 17 | package com.android.documentsui.dirlist; |
| 18 | |
| 19 | import static com.android.internal.util.Preconditions.checkArgument; |
| 20 | |
Steve McKay | 76be620 | 2016-01-12 11:14:33 -0800 | [diff] [blame] | 21 | import android.content.Context; |
| 22 | import android.database.Cursor; |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 23 | import android.support.v7.widget.GridLayoutManager; |
| 24 | import android.support.v7.widget.RecyclerView.AdapterDataObserver; |
| 25 | import android.util.SparseArray; |
| 26 | import android.view.ViewGroup; |
Steve McKay | 76be620 | 2016-01-12 11:14:33 -0800 | [diff] [blame] | 27 | import android.widget.Space; |
| 28 | |
| 29 | import com.android.documentsui.R; |
| 30 | import com.android.documentsui.State; |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 31 | |
| 32 | import java.util.List; |
| 33 | |
| 34 | /** |
| 35 | * Adapter wrapper that inserts a sort of line break item between directories and regular files. |
| 36 | * Only needs to be used in GRID mode...at this time. |
| 37 | */ |
| 38 | final class SectionBreakDocumentsAdapterWrapper extends DocumentsAdapter { |
| 39 | |
| 40 | private static final String TAG = "SectionBreakDocumentsAdapterWrapper"; |
| 41 | private static final int ITEM_TYPE_SECTION_BREAK = Integer.MAX_VALUE; |
| 42 | |
| 43 | private final Environment mEnv; |
| 44 | private final DocumentsAdapter mDelegate; |
| 45 | |
| 46 | private int mBreakPosition = -1; |
| 47 | |
| 48 | SectionBreakDocumentsAdapterWrapper(Environment environment, DocumentsAdapter delegate) { |
| 49 | mEnv = environment; |
| 50 | mDelegate = delegate; |
| 51 | |
Steve McKay | 955e46d | 2016-01-05 12:53:35 -0800 | [diff] [blame] | 52 | // Relay events published by our delegate to our listeners (presumably RecyclerView) |
| 53 | // with adjusted positions. |
| 54 | mDelegate.registerAdapterDataObserver(new EventRelay()); |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 55 | } |
| 56 | |
| 57 | public GridLayoutManager.SpanSizeLookup createSpanSizeLookup() { |
| 58 | return new GridLayoutManager.SpanSizeLookup() { |
| 59 | @Override |
| 60 | public int getSpanSize(int position) { |
| 61 | // Make layout whitespace span the grid. This has the effect of breaking |
| 62 | // grid rows whenever layout whitespace is encountered. |
| 63 | if (getItemViewType(position) == ITEM_TYPE_SECTION_BREAK) { |
| 64 | return mEnv.getColumnCount(); |
| 65 | } else { |
| 66 | return 1; |
| 67 | } |
| 68 | } |
| 69 | }; |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public DocumentHolder onCreateViewHolder(ViewGroup parent, int viewType) { |
| 74 | if (viewType == ITEM_TYPE_SECTION_BREAK) { |
| 75 | return new EmptyDocumentHolder(mEnv.getContext()); |
| 76 | } else { |
| 77 | return mDelegate.createViewHolder(parent, viewType); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | @Override |
| 82 | public void onBindViewHolder(DocumentHolder holder, int p, List<Object> payload) { |
| 83 | if (holder.getItemViewType() != ITEM_TYPE_SECTION_BREAK) { |
| 84 | mDelegate.onBindViewHolder(holder, toDelegatePosition(p), payload); |
Ben Kwa | 90bf9f5 | 2016-01-08 13:31:11 -0800 | [diff] [blame] | 85 | } else { |
| 86 | ((EmptyDocumentHolder)holder).bind(mEnv.getDisplayState()); |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 87 | } |
| 88 | } |
| 89 | |
| 90 | @Override |
| 91 | public void onBindViewHolder(DocumentHolder holder, int p) { |
| 92 | if (holder.getItemViewType() != ITEM_TYPE_SECTION_BREAK) { |
| 93 | mDelegate.onBindViewHolder(holder, toDelegatePosition(p)); |
Ben Kwa | 90bf9f5 | 2016-01-08 13:31:11 -0800 | [diff] [blame] | 94 | } else { |
| 95 | ((EmptyDocumentHolder)holder).bind(mEnv.getDisplayState()); |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 96 | } |
| 97 | } |
| 98 | |
| 99 | @Override |
| 100 | public int getItemCount() { |
| 101 | return mBreakPosition == -1 |
| 102 | ? mDelegate.getItemCount() |
| 103 | : mDelegate.getItemCount() + 1; |
| 104 | } |
| 105 | |
| 106 | @Override |
| 107 | public void onModelUpdate(Model model) { |
| 108 | mDelegate.onModelUpdate(model); |
| 109 | mBreakPosition = -1; |
| 110 | |
| 111 | // Walk down the list of IDs till we encounter something that's not a directory, and |
| 112 | // insert a whitespace element - this introduces a visual break in the grid between |
| 113 | // folders and documents. |
| 114 | // TODO: This code makes assumptions about the model, namely, that it performs a |
| 115 | // bucketed sort where directories will always be ordered before other files. CBB. |
| 116 | List<String> modelIds = mDelegate.getModelIds(); |
| 117 | for (int i = 0; i < modelIds.size(); i++) { |
| 118 | if (!isDirectory(model, i)) { |
Ben Kwa | f5ce103 | 2016-01-08 08:41:34 -0800 | [diff] [blame] | 119 | // If the break is the first thing in the list, then there are actually no |
| 120 | // directories. In that case, don't insert a break at all. |
| 121 | if (i > 0) { |
| 122 | mBreakPosition = i; |
| 123 | } |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 124 | break; |
| 125 | } |
| 126 | } |
| 127 | } |
| 128 | |
| 129 | @Override |
| 130 | public void onModelUpdateFailed(Exception e) { |
| 131 | mDelegate.onModelUpdateFailed(e); |
| 132 | } |
| 133 | |
| 134 | @Override |
| 135 | public int getItemViewType(int p) { |
| 136 | if (p == mBreakPosition) { |
| 137 | return ITEM_TYPE_SECTION_BREAK; |
| 138 | } else { |
| 139 | return mDelegate.getItemViewType(toDelegatePosition(p)); |
| 140 | } |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Returns the position of an item in the delegate, adjusting |
| 145 | * values that are greater than the break position. |
| 146 | * |
| 147 | * @param p Position within the view |
| 148 | * @return Position within the delegate |
| 149 | */ |
| 150 | private int toDelegatePosition(int p) { |
| 151 | return (mBreakPosition != -1 && p > mBreakPosition) ? p - 1 : p; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Returns the position of an item in the view, adjusting |
| 156 | * values that are greater than the break position. |
| 157 | * |
| 158 | * @param p Position within the delegate |
| 159 | * @return Position within the view |
| 160 | */ |
| 161 | private int toViewPosition(int p) { |
| 162 | // If position is greater than or equal to the break, increase by one. |
| 163 | return (mBreakPosition != -1 && p >= mBreakPosition) ? p + 1 : p; |
| 164 | } |
| 165 | |
| 166 | @Override |
| 167 | public SparseArray<String> hide(String... ids) { |
| 168 | // NOTE: We hear about these changes and adjust break position |
| 169 | // in our AdapterDataObserver. |
| 170 | return mDelegate.hide(ids); |
| 171 | } |
| 172 | |
| 173 | @Override |
| 174 | void unhide(SparseArray<String> ids) { |
| 175 | // NOTE: We hear about these changes and adjust break position |
| 176 | // in our AdapterDataObserver. |
| 177 | mDelegate.unhide(ids); |
| 178 | } |
| 179 | |
| 180 | @Override |
| 181 | List<String> getModelIds() { |
| 182 | return mDelegate.getModelIds(); |
| 183 | } |
| 184 | |
| 185 | @Override |
| 186 | String getModelId(int p) { |
| 187 | return (p == mBreakPosition) ? null : mDelegate.getModelId(toDelegatePosition(p)); |
| 188 | } |
| 189 | |
| 190 | @Override |
Steve McKay | 955e46d | 2016-01-05 12:53:35 -0800 | [diff] [blame] | 191 | public void onItemSelectionChanged(String id) { |
| 192 | mDelegate.onItemSelectionChanged(id); |
| 193 | } |
| 194 | |
| 195 | // Listener we add to our delegate. This allows us to relay events published |
| 196 | // by the delegate to our listeners (presumably RecyclerView) with adjusted positions. |
| 197 | private final class EventRelay extends AdapterDataObserver { |
| 198 | public void onChanged() { |
| 199 | throw new UnsupportedOperationException(); |
| 200 | } |
| 201 | |
| 202 | public void onItemRangeChanged(int positionStart, int itemCount) { |
| 203 | throw new UnsupportedOperationException(); |
| 204 | } |
| 205 | |
| 206 | public void onItemRangeChanged(int positionStart, int itemCount, Object payload) { |
| 207 | checkArgument(itemCount == 1); |
| 208 | notifyItemRangeChanged(toViewPosition(positionStart), itemCount, payload); |
| 209 | } |
| 210 | |
| 211 | public void onItemRangeInserted(int positionStart, int itemCount) { |
| 212 | checkArgument(itemCount == 1); |
| 213 | if (positionStart < mBreakPosition) { |
| 214 | mBreakPosition++; |
| 215 | } |
| 216 | notifyItemRangeInserted(toViewPosition(positionStart), itemCount); |
| 217 | } |
| 218 | |
| 219 | public void onItemRangeRemoved(int positionStart, int itemCount) { |
| 220 | checkArgument(itemCount == 1); |
| 221 | if (positionStart < mBreakPosition) { |
| 222 | mBreakPosition--; |
| 223 | } |
| 224 | notifyItemRangeRemoved(toViewPosition(positionStart), itemCount); |
| 225 | } |
| 226 | |
| 227 | public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) { |
| 228 | throw new UnsupportedOperationException(); |
| 229 | } |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 230 | } |
Steve McKay | 76be620 | 2016-01-12 11:14:33 -0800 | [diff] [blame] | 231 | |
| 232 | /** |
| 233 | * The most elegant transparent blank box that spans N rows ever conceived. |
| 234 | */ |
| 235 | private static final class EmptyDocumentHolder extends DocumentHolder { |
| 236 | final int mVisibleHeight; |
| 237 | |
| 238 | public EmptyDocumentHolder(Context context) { |
| 239 | super(context, new Space(context)); |
| 240 | |
| 241 | // Per UX spec, this puts a bigger gap between the folders and documents in the grid. |
| 242 | mVisibleHeight = context.getResources().getDimensionPixelSize( |
| 243 | R.dimen.grid_item_margin); |
| 244 | } |
| 245 | |
| 246 | public void bind(State state) { |
| 247 | bind(null, null, state); |
| 248 | } |
| 249 | |
| 250 | @Override |
| 251 | public void bind(Cursor cursor, String modelId, State state) { |
| 252 | if (state.derivedMode == State.MODE_GRID) { |
| 253 | itemView.setMinimumHeight(mVisibleHeight); |
| 254 | } else { |
| 255 | itemView.setMinimumHeight(0); |
| 256 | } |
| 257 | return; |
| 258 | } |
| 259 | } |
Steve McKay | ef16f5f | 2015-12-22 18:15:31 -0800 | [diff] [blame] | 260 | } |