ListMenuPresenter.java revision da10fdd1400ecfd8d7f2e55651dd528d0614dfc5
1/* 2 * Copyright (C) 2013 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 17package android.support.v7.internal.view.menu; 18 19import android.content.Context; 20import android.database.DataSetObserver; 21import android.os.Bundle; 22import android.os.Parcelable; 23import android.support.v7.appcompat.R; 24import android.util.SparseArray; 25import android.view.ContextThemeWrapper; 26import android.view.LayoutInflater; 27import android.view.View; 28import android.view.ViewGroup; 29import android.widget.AdapterView; 30import android.widget.BaseAdapter; 31import android.widget.ListAdapter; 32 33import java.util.ArrayList; 34 35/** 36 * MenuPresenter for list-style menus. 37 */ 38public class ListMenuPresenter implements MenuPresenter, AdapterView.OnItemClickListener { 39 private static final String TAG = "ListMenuPresenter"; 40 41 Context mContext; 42 LayoutInflater mInflater; 43 MenuBuilder mMenu; 44 45 ExpandedMenuView mMenuView; 46 47 private int mItemIndexOffset; 48 int mThemeRes; 49 int mItemLayoutRes; 50 51 private Callback mCallback; 52 MenuAdapter mAdapter; 53 54 private int mId; 55 56 public static final String VIEWS_TAG = "android:menu:list"; 57 58 /** 59 * Construct a new ListMenuPresenter. 60 * @param context Context to use for theming. This will supersede the context provided 61 * to initForMenu when this presenter is added. 62 * @param itemLayoutRes Layout resource for individual item views. 63 */ 64 public ListMenuPresenter(Context context, int itemLayoutRes) { 65 this(itemLayoutRes, 0); 66 mContext = context; 67 mInflater = LayoutInflater.from(mContext); 68 } 69 70 /** 71 * Construct a new ListMenuPresenter. 72 * @param itemLayoutRes Layout resource for individual item views. 73 * @param themeRes Resource ID of a theme to use for views. 74 */ 75 public ListMenuPresenter(int itemLayoutRes, int themeRes) { 76 mItemLayoutRes = itemLayoutRes; 77 mThemeRes = themeRes; 78 } 79 80 @Override 81 public void initForMenu(Context context, MenuBuilder menu) { 82 if (mThemeRes != 0) { 83 mContext = new ContextThemeWrapper(context, mThemeRes); 84 mInflater = LayoutInflater.from(mContext); 85 } else if (mContext != null) { 86 mContext = context; 87 if (mInflater == null) { 88 mInflater = LayoutInflater.from(mContext); 89 } 90 } 91 mMenu = menu; 92 if (mAdapter != null) { 93 mAdapter.notifyDataSetChanged(); 94 } 95 } 96 97 @Override 98 public MenuView getMenuView(ViewGroup root) { 99 if (mAdapter == null) { 100 mAdapter = new MenuAdapter(); 101 } 102 103 if (!mAdapter.isEmpty()) { 104 if (mMenuView == null) { 105 mMenuView = (ExpandedMenuView) mInflater.inflate( 106 R.layout.expanded_menu_layout, root, false); 107 mMenuView.setAdapter(mAdapter); 108 mMenuView.setOnItemClickListener(this); 109 } 110 return mMenuView; 111 } 112 113 // If we reach here, the Menu is empty so we have nothing to display 114 return null; 115 } 116 117 /** 118 * Call this instead of getMenuView if you want to manage your own ListView. 119 * For proper operation, the ListView hosting this adapter should add 120 * this presenter as an OnItemClickListener. 121 * 122 * @return A ListAdapter containing the items in the menu. 123 */ 124 public ListAdapter getAdapter() { 125 if (mAdapter == null) { 126 mAdapter = new MenuAdapter(); 127 } 128 return mAdapter; 129 } 130 131 @Override 132 public void updateMenuView(boolean cleared) { 133 if (mAdapter != null) mAdapter.notifyDataSetChanged(); 134 } 135 136 @Override 137 public void setCallback(Callback cb) { 138 mCallback = cb; 139 } 140 141 @Override 142 public boolean onSubMenuSelected(SubMenuBuilder subMenu) { 143 if (!subMenu.hasVisibleItems()) return false; 144 145 // The window manager will give us a token. 146 new MenuDialogHelper(subMenu).show(null); 147 if (mCallback != null) { 148 mCallback.onOpenSubMenu(subMenu); 149 } 150 return true; 151 } 152 153 @Override 154 public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) { 155 if (mCallback != null) { 156 mCallback.onCloseMenu(menu, allMenusAreClosing); 157 } 158 } 159 160 int getItemIndexOffset() { 161 return mItemIndexOffset; 162 } 163 164 public void setItemIndexOffset(int offset) { 165 mItemIndexOffset = offset; 166 if (mMenuView != null) { 167 updateMenuView(false); 168 } 169 } 170 171 @Override 172 public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 173 mMenu.performItemAction(mAdapter.getItem(position), 0); 174 } 175 176 @Override 177 public boolean flagActionItems() { 178 return false; 179 } 180 181 public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) { 182 return false; 183 } 184 185 public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) { 186 return false; 187 } 188 189 public void saveHierarchyState(Bundle outState) { 190 SparseArray<Parcelable> viewStates = new SparseArray<Parcelable>(); 191 if (mMenuView != null) { 192 ((View) mMenuView).saveHierarchyState(viewStates); 193 } 194 outState.putSparseParcelableArray(VIEWS_TAG, viewStates); 195 } 196 197 public void restoreHierarchyState(Bundle inState) { 198 SparseArray<Parcelable> viewStates = inState.getSparseParcelableArray(VIEWS_TAG); 199 if (viewStates != null) { 200 ((View) mMenuView).restoreHierarchyState(viewStates); 201 } 202 } 203 204 public void setId(int id) { 205 mId = id; 206 } 207 208 @Override 209 public int getId() { 210 return mId; 211 } 212 213 @Override 214 public Parcelable onSaveInstanceState() { 215 if (mMenuView == null) { 216 return null; 217 } 218 219 Bundle state = new Bundle(); 220 saveHierarchyState(state); 221 return state; 222 } 223 224 @Override 225 public void onRestoreInstanceState(Parcelable state) { 226 restoreHierarchyState((Bundle) state); 227 } 228 229 private class MenuAdapter extends BaseAdapter { 230 private int mExpandedIndex = -1; 231 232 public MenuAdapter() { 233 findExpandedIndex(); 234 } 235 236 public int getCount() { 237 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 238 int count = items.size() - mItemIndexOffset; 239 if (mExpandedIndex < 0) { 240 return count; 241 } 242 return count - 1; 243 } 244 245 public MenuItemImpl getItem(int position) { 246 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 247 position += mItemIndexOffset; 248 if (mExpandedIndex >= 0 && position >= mExpandedIndex) { 249 position++; 250 } 251 return items.get(position); 252 } 253 254 public long getItemId(int position) { 255 // Since a menu item's ID is optional, we'll use the position as an 256 // ID for the item in the AdapterView 257 return position; 258 } 259 260 public View getView(int position, View convertView, ViewGroup parent) { 261 if (convertView == null) { 262 convertView = mInflater.inflate(mItemLayoutRes, parent, false); 263 } 264 265 MenuView.ItemView itemView = (MenuView.ItemView) convertView; 266 itemView.initialize(getItem(position), 0); 267 return convertView; 268 } 269 270 void findExpandedIndex() { 271 final MenuItemImpl expandedItem = mMenu.getExpandedItem(); 272 if (expandedItem != null) { 273 final ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 274 final int count = items.size(); 275 for (int i = 0; i < count; i++) { 276 final MenuItemImpl item = items.get(i); 277 if (item == expandedItem) { 278 mExpandedIndex = i; 279 return; 280 } 281 } 282 } 283 mExpandedIndex = -1; 284 } 285 286 @Override 287 public void notifyDataSetChanged() { 288 findExpandedIndex(); 289 super.notifyDataSetChanged(); 290 } 291 } 292} 293