1/* This file is auto-generated from BaseRowFragment.java. DO NOT MODIFY. */ 2 3/* 4 * Copyright (C) 2014 The Android Open Source Project 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except 7 * in compliance with the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software distributed under the License 12 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express 13 * or implied. See the License for the specific language governing permissions and limitations under 14 * the License. 15 */ 16package android.support.v17.leanback.app; 17 18import android.support.v4.app.Fragment; 19import android.os.Bundle; 20import android.support.v17.leanback.widget.ItemBridgeAdapter; 21import android.support.v17.leanback.widget.ListRow; 22import android.support.v17.leanback.widget.ObjectAdapter; 23import android.support.v17.leanback.widget.OnChildViewHolderSelectedListener; 24import android.support.v17.leanback.widget.PresenterSelector; 25import android.support.v17.leanback.widget.Row; 26import android.support.v17.leanback.widget.VerticalGridView; 27import android.support.v7.widget.RecyclerView; 28import android.view.LayoutInflater; 29import android.view.View; 30import android.view.ViewGroup; 31 32/** 33 * An internal base class for a fragment containing a list of rows. 34 */ 35abstract class BaseRowSupportFragment extends Fragment { 36 private static final String CURRENT_SELECTED_POSITION = "currentSelectedPosition"; 37 private ObjectAdapter mAdapter; 38 VerticalGridView mVerticalGridView; 39 private PresenterSelector mPresenterSelector; 40 ItemBridgeAdapter mBridgeAdapter; 41 int mSelectedPosition = -1; 42 private boolean mPendingTransitionPrepare; 43 private LateSelectionObserver mLateSelectionObserver = new LateSelectionObserver(); 44 45 abstract int getLayoutResourceId(); 46 47 private final OnChildViewHolderSelectedListener mRowSelectedListener = 48 new OnChildViewHolderSelectedListener() { 49 @Override 50 public void onChildViewHolderSelected(RecyclerView parent, 51 RecyclerView.ViewHolder view, int position, int subposition) { 52 mSelectedPosition = position; 53 onRowSelected(parent, view, position, subposition); 54 } 55 }; 56 57 void onRowSelected(RecyclerView parent, RecyclerView.ViewHolder view, 58 int position, int subposition) { 59 } 60 61 @Override 62 public View onCreateView(LayoutInflater inflater, ViewGroup container, 63 Bundle savedInstanceState) { 64 View view = inflater.inflate(getLayoutResourceId(), container, false); 65 mVerticalGridView = findGridViewFromRoot(view); 66 if (mPendingTransitionPrepare) { 67 mPendingTransitionPrepare = false; 68 onTransitionPrepare(); 69 } 70 return view; 71 } 72 73 VerticalGridView findGridViewFromRoot(View view) { 74 return (VerticalGridView) view; 75 } 76 77 @Override 78 public void onViewCreated(View view, Bundle savedInstanceState) { 79 if (savedInstanceState != null) { 80 mSelectedPosition = savedInstanceState.getInt(CURRENT_SELECTED_POSITION, -1); 81 } 82 if (mBridgeAdapter != null) { 83 setAdapterAndSelection(); 84 } 85 mVerticalGridView.setOnChildViewHolderSelectedListener(mRowSelectedListener); 86 } 87 88 /** 89 * This class waits for the adapter to be updated before setting the selected 90 * row. 91 */ 92 private class LateSelectionObserver extends RecyclerView.AdapterDataObserver { 93 boolean mIsLateSelection = false; 94 95 LateSelectionObserver() { 96 } 97 98 @Override 99 public void onChanged() { 100 performLateSelection(); 101 } 102 103 @Override 104 public void onItemRangeInserted(int positionStart, int itemCount) { 105 performLateSelection(); 106 } 107 108 void startLateSelection() { 109 mIsLateSelection = true; 110 mBridgeAdapter.registerAdapterDataObserver(this); 111 } 112 113 void performLateSelection() { 114 clear(); 115 if (mVerticalGridView != null) { 116 mVerticalGridView.setSelectedPosition(mSelectedPosition); 117 } 118 } 119 120 void clear() { 121 if (mIsLateSelection) { 122 mIsLateSelection = false; 123 mBridgeAdapter.unregisterAdapterDataObserver(this); 124 } 125 } 126 } 127 128 void setAdapterAndSelection() { 129 mVerticalGridView.setAdapter(mBridgeAdapter); 130 // We don't set the selected position unless we've data in the adapter. 131 boolean lateSelection = mBridgeAdapter.getItemCount() == 0 && mSelectedPosition >= 0; 132 if (lateSelection) { 133 mLateSelectionObserver.startLateSelection(); 134 } else if (mSelectedPosition >= 0) { 135 mVerticalGridView.setSelectedPosition(mSelectedPosition); 136 } 137 } 138 139 @Override 140 public void onDestroyView() { 141 super.onDestroyView(); 142 mLateSelectionObserver.clear(); 143 mVerticalGridView = null; 144 } 145 146 @Override 147 public void onSaveInstanceState(Bundle outState) { 148 super.onSaveInstanceState(outState); 149 outState.putInt(CURRENT_SELECTED_POSITION, mSelectedPosition); 150 } 151 152 /** 153 * Set the presenter selector used to create and bind views. 154 */ 155 public final void setPresenterSelector(PresenterSelector presenterSelector) { 156 mPresenterSelector = presenterSelector; 157 updateAdapter(); 158 } 159 160 /** 161 * Get the presenter selector used to create and bind views. 162 */ 163 public final PresenterSelector getPresenterSelector() { 164 return mPresenterSelector; 165 } 166 167 /** 168 * Sets the adapter for the fragment. 169 */ 170 public final void setAdapter(ObjectAdapter rowsAdapter) { 171 mAdapter = rowsAdapter; 172 updateAdapter(); 173 } 174 175 /** 176 * Returns the list of rows. 177 */ 178 public final ObjectAdapter getAdapter() { 179 return mAdapter; 180 } 181 182 /** 183 * Returns the bridge adapter. 184 */ 185 final ItemBridgeAdapter getBridgeAdapter() { 186 return mBridgeAdapter; 187 } 188 189 /** 190 * Sets the selected row position with smooth animation. 191 */ 192 public void setSelectedPosition(int position) { 193 setSelectedPosition(position, true); 194 } 195 196 /** 197 * Gets position of currently selected row. 198 * @return Position of currently selected row. 199 */ 200 public int getSelectedPosition() { 201 return mSelectedPosition; 202 } 203 204 /** 205 * Sets the selected row position. 206 */ 207 public void setSelectedPosition(int position, boolean smooth) { 208 if (mSelectedPosition == position) { 209 return; 210 } 211 mSelectedPosition = position; 212 if(mVerticalGridView != null && mVerticalGridView.getAdapter() != null) { 213 if (mLateSelectionObserver.mIsLateSelection) { 214 return; 215 } 216 if (smooth) { 217 mVerticalGridView.setSelectedPositionSmooth(position); 218 } else { 219 mVerticalGridView.setSelectedPosition(position); 220 } 221 } 222 } 223 224 final VerticalGridView getVerticalGridView() { 225 return mVerticalGridView; 226 } 227 228 void updateAdapter() { 229 if (mBridgeAdapter != null) { 230 // detach observer from ObjectAdapter 231 mLateSelectionObserver.clear(); 232 mBridgeAdapter.clear(); 233 mBridgeAdapter = null; 234 } 235 236 if (mAdapter != null) { 237 // If presenter selector is null, adapter ps will be used 238 mBridgeAdapter = new ItemBridgeAdapter(mAdapter, mPresenterSelector); 239 } 240 if (mVerticalGridView != null) { 241 setAdapterAndSelection(); 242 } 243 } 244 245 Object getItem(Row row, int position) { 246 if (row instanceof ListRow) { 247 return ((ListRow) row).getAdapter().get(position); 248 } else { 249 return null; 250 } 251 } 252 253 public boolean onTransitionPrepare() { 254 if (mVerticalGridView != null) { 255 mVerticalGridView.setAnimateChildLayout(false); 256 mVerticalGridView.setScrollEnabled(false); 257 return true; 258 } 259 mPendingTransitionPrepare = true; 260 return false; 261 } 262 263 public void onTransitionStart() { 264 if (mVerticalGridView != null) { 265 mVerticalGridView.setPruneChild(false); 266 mVerticalGridView.setLayoutFrozen(true); 267 mVerticalGridView.setFocusSearchDisabled(true); 268 } 269 } 270 271 public void onTransitionEnd() { 272 // be careful that fragment might be destroyed before header transition ends. 273 if (mVerticalGridView != null) { 274 mVerticalGridView.setLayoutFrozen(false); 275 mVerticalGridView.setAnimateChildLayout(true); 276 mVerticalGridView.setPruneChild(true); 277 mVerticalGridView.setFocusSearchDisabled(false); 278 mVerticalGridView.setScrollEnabled(true); 279 } 280 } 281 282 public void setAlignment(int windowAlignOffsetTop) { 283 if (mVerticalGridView != null) { 284 // align the top edge of item 285 mVerticalGridView.setItemAlignmentOffset(0); 286 mVerticalGridView.setItemAlignmentOffsetPercent( 287 VerticalGridView.ITEM_ALIGN_OFFSET_PERCENT_DISABLED); 288 289 // align to a fixed position from top 290 mVerticalGridView.setWindowAlignmentOffset(windowAlignOffsetTop); 291 mVerticalGridView.setWindowAlignmentOffsetPercent( 292 VerticalGridView.WINDOW_ALIGN_OFFSET_PERCENT_DISABLED); 293 mVerticalGridView.setWindowAlignment(VerticalGridView.WINDOW_ALIGN_NO_EDGE); 294 } 295 } 296} 297