1 /* 2 * Copyright (C) 2011 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.internal.view.menu; 18 19 import android.content.Context; 20 import android.database.DataSetObserver; 21 import android.os.Bundle; 22 import android.os.Parcelable; 23 import android.util.SparseArray; 24 import android.view.ContextThemeWrapper; 25 import android.view.LayoutInflater; 26 import android.view.View; 27 import android.view.ViewGroup; 28 import android.widget.AdapterView; 29 import android.widget.BaseAdapter; 30 import android.widget.ListAdapter; 31 32 import java.util.ArrayList; 33 34 /** 35 * MenuPresenter for list-style menus. 36 */ 37 public class ListMenuPresenter implements MenuPresenter, AdapterView.OnItemClickListener { 38 private static final String TAG = "ListMenuPresenter"; 39 40 Context mContext; 41 LayoutInflater mInflater; 42 MenuBuilder mMenu; 43 44 ExpandedMenuView mMenuView; 45 46 private int mItemIndexOffset; 47 int mThemeRes; 48 int mItemLayoutRes; 49 50 private Callback mCallback; 51 MenuAdapter mAdapter; 52 53 private int mId; 54 55 public static final String VIEWS_TAG = "android:menu:list"; 56 57 /** 58 * Construct a new ListMenuPresenter. 59 * @param context Context to use for theming. This will supersede the context provided 60 * to initForMenu when this presenter is added. 61 * @param itemLayoutRes Layout resource for individual item views. 62 */ 63 public ListMenuPresenter(Context context, int itemLayoutRes) { 64 this(itemLayoutRes, 0); 65 mContext = context; 66 mInflater = LayoutInflater.from(mContext); 67 } 68 69 /** 70 * Construct a new ListMenuPresenter. 71 * @param itemLayoutRes Layout resource for individual item views. 72 * @param themeRes Resource ID of a theme to use for views. 73 */ 74 public ListMenuPresenter(int itemLayoutRes, int themeRes) { 75 mItemLayoutRes = itemLayoutRes; 76 mThemeRes = themeRes; 77 } 78 79 @Override 80 public void initForMenu(Context context, MenuBuilder menu) { 81 if (mThemeRes != 0) { 82 mContext = new ContextThemeWrapper(context, mThemeRes); 83 mInflater = LayoutInflater.from(mContext); 84 } else if (mContext != null) { 85 mContext = context; 86 if (mInflater == null) { 87 mInflater = LayoutInflater.from(mContext); 88 } 89 } 90 mMenu = menu; 91 } 92 93 @Override 94 public MenuView getMenuView(ViewGroup root) { 95 if (mMenuView == null) { 96 mMenuView = (ExpandedMenuView) mInflater.inflate( 97 com.android.internal.R.layout.expanded_menu_layout, root, false); 98 if (mAdapter == null) { 99 mAdapter = new MenuAdapter(); 100 } 101 mMenuView.setAdapter(mAdapter); 102 mMenuView.setOnItemClickListener(this); 103 } 104 return mMenuView; 105 } 106 107 /** 108 * Call this instead of getMenuView if you want to manage your own ListView. 109 * For proper operation, the ListView hosting this adapter should add 110 * this presenter as an OnItemClickListener. 111 * 112 * @return A ListAdapter containing the items in the menu. 113 */ 114 public ListAdapter getAdapter() { 115 if (mAdapter == null) { 116 mAdapter = new MenuAdapter(); 117 } 118 return mAdapter; 119 } 120 121 @Override 122 public void updateMenuView(boolean cleared) { 123 if (mAdapter != null) mAdapter.notifyDataSetChanged(); 124 } 125 126 @Override 127 public void setCallback(Callback cb) { 128 mCallback = cb; 129 } 130 131 @Override 132 public boolean onSubMenuSelected(SubMenuBuilder subMenu) { 133 if (!subMenu.hasVisibleItems()) return false; 134 135 // The window manager will give us a token. 136 new MenuDialogHelper(subMenu).show(null); 137 if (mCallback != null) { 138 mCallback.onOpenSubMenu(subMenu); 139 } 140 return true; 141 } 142 143 @Override 144 public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) { 145 if (mCallback != null) { 146 mCallback.onCloseMenu(menu, allMenusAreClosing); 147 } 148 } 149 150 int getItemIndexOffset() { 151 return mItemIndexOffset; 152 } 153 154 public void setItemIndexOffset(int offset) { 155 mItemIndexOffset = offset; 156 if (mMenuView != null) { 157 updateMenuView(false); 158 } 159 } 160 161 @Override 162 public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 163 mMenu.performItemAction(mAdapter.getItem(position), 0); 164 } 165 166 @Override 167 public boolean flagActionItems() { 168 return false; 169 } 170 171 public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) { 172 return false; 173 } 174 175 public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) { 176 return false; 177 } 178 179 public void saveHierarchyState(Bundle outState) { 180 SparseArray<Parcelable> viewStates = new SparseArray<Parcelable>(); 181 if (mMenuView != null) { 182 ((View) mMenuView).saveHierarchyState(viewStates); 183 } 184 outState.putSparseParcelableArray(VIEWS_TAG, viewStates); 185 } 186 187 public void restoreHierarchyState(Bundle inState) { 188 SparseArray<Parcelable> viewStates = inState.getSparseParcelableArray(VIEWS_TAG); 189 if (viewStates != null) { 190 ((View) mMenuView).restoreHierarchyState(viewStates); 191 } 192 } 193 194 public void setId(int id) { 195 mId = id; 196 } 197 198 @Override 199 public int getId() { 200 return mId; 201 } 202 203 @Override 204 public Parcelable onSaveInstanceState() { 205 if (mMenuView == null) { 206 return null; 207 } 208 209 Bundle state = new Bundle(); 210 saveHierarchyState(state); 211 return state; 212 } 213 214 @Override 215 public void onRestoreInstanceState(Parcelable state) { 216 restoreHierarchyState((Bundle) state); 217 } 218 219 private class MenuAdapter extends BaseAdapter { 220 private int mExpandedIndex = -1; 221 222 public MenuAdapter() { 223 registerDataSetObserver(new ExpandedIndexObserver()); 224 findExpandedIndex(); 225 } 226 227 public int getCount() { 228 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 229 int count = items.size() - mItemIndexOffset; 230 if (mExpandedIndex < 0) { 231 return count; 232 } 233 return count - 1; 234 } 235 236 public MenuItemImpl getItem(int position) { 237 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 238 position += mItemIndexOffset; 239 if (mExpandedIndex >= 0 && position >= mExpandedIndex) { 240 position++; 241 } 242 return items.get(position); 243 } 244 245 public long getItemId(int position) { 246 // Since a menu item's ID is optional, we'll use the position as an 247 // ID for the item in the AdapterView 248 return position; 249 } 250 251 public View getView(int position, View convertView, ViewGroup parent) { 252 if (convertView == null) { 253 convertView = mInflater.inflate(mItemLayoutRes, parent, false); 254 } 255 256 MenuView.ItemView itemView = (MenuView.ItemView) convertView; 257 itemView.initialize(getItem(position), 0); 258 return convertView; 259 } 260 261 void findExpandedIndex() { 262 final MenuItemImpl expandedItem = mMenu.getExpandedItem(); 263 if (expandedItem != null) { 264 final ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 265 final int count = items.size(); 266 for (int i = 0; i < count; i++) { 267 final MenuItemImpl item = items.get(i); 268 if (item == expandedItem) { 269 mExpandedIndex = i; 270 return; 271 } 272 } 273 } 274 mExpandedIndex = -1; 275 } 276 } 277 278 private class ExpandedIndexObserver extends DataSetObserver { 279 @Override 280 public void onChanged() { 281 mAdapter.findExpandedIndex(); 282 } 283 } 284 } 285
