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.view.menu; 18 19import android.content.Context; 20import android.os.Bundle; 21import android.os.Parcelable; 22import android.support.v7.appcompat.R; 23import android.util.SparseArray; 24import android.view.ContextThemeWrapper; 25import android.view.LayoutInflater; 26import android.view.View; 27import android.view.ViewGroup; 28import android.widget.AdapterView; 29import android.widget.BaseAdapter; 30import android.widget.ListAdapter; 31 32import java.util.ArrayList; 33 34/** 35 * MenuPresenter for list-style menus. 36 * 37 * @hide 38 */ 39public class ListMenuPresenter implements MenuPresenter, AdapterView.OnItemClickListener { 40 private static final String TAG = "ListMenuPresenter"; 41 42 Context mContext; 43 LayoutInflater mInflater; 44 MenuBuilder mMenu; 45 46 ExpandedMenuView mMenuView; 47 48 private int mItemIndexOffset; 49 int mThemeRes; 50 int mItemLayoutRes; 51 52 private Callback mCallback; 53 MenuAdapter mAdapter; 54 55 private int mId; 56 57 public static final String VIEWS_TAG = "android:menu:list"; 58 59 /** 60 * Construct a new ListMenuPresenter. 61 * @param context Context to use for theming. This will supersede the context provided 62 * to initForMenu when this presenter is added. 63 * @param itemLayoutRes Layout resource for individual item views. 64 */ 65 public ListMenuPresenter(Context context, int itemLayoutRes) { 66 this(itemLayoutRes, 0); 67 mContext = context; 68 mInflater = LayoutInflater.from(mContext); 69 } 70 71 /** 72 * Construct a new ListMenuPresenter. 73 * @param itemLayoutRes Layout resource for individual item views. 74 * @param themeRes Resource ID of a theme to use for views. 75 */ 76 public ListMenuPresenter(int itemLayoutRes, int themeRes) { 77 mItemLayoutRes = itemLayoutRes; 78 mThemeRes = themeRes; 79 } 80 81 @Override 82 public void initForMenu(Context context, MenuBuilder menu) { 83 if (mThemeRes != 0) { 84 mContext = new ContextThemeWrapper(context, mThemeRes); 85 mInflater = LayoutInflater.from(mContext); 86 } else if (mContext != null) { 87 mContext = context; 88 if (mInflater == null) { 89 mInflater = LayoutInflater.from(mContext); 90 } 91 } 92 mMenu = menu; 93 if (mAdapter != null) { 94 mAdapter.notifyDataSetChanged(); 95 } 96 } 97 98 @Override 99 public MenuView getMenuView(ViewGroup root) { 100 if (mMenuView == null) { 101 mMenuView = (ExpandedMenuView) mInflater.inflate( 102 R.layout.abc_expanded_menu_layout, root, false); 103 if (mAdapter == null) { 104 mAdapter = new MenuAdapter(); 105 } 106 mMenuView.setAdapter(mAdapter); 107 mMenuView.setOnItemClickListener(this); 108 } 109 return mMenuView; 110 } 111 112 /** 113 * Call this instead of getMenuView if you want to manage your own ListView. 114 * For proper operation, the ListView hosting this adapter should add 115 * this presenter as an OnItemClickListener. 116 * 117 * @return A ListAdapter containing the items in the menu. 118 */ 119 public ListAdapter getAdapter() { 120 if (mAdapter == null) { 121 mAdapter = new MenuAdapter(); 122 } 123 return mAdapter; 124 } 125 126 @Override 127 public void updateMenuView(boolean cleared) { 128 if (mAdapter != null) mAdapter.notifyDataSetChanged(); 129 } 130 131 @Override 132 public void setCallback(Callback cb) { 133 mCallback = cb; 134 } 135 136 @Override 137 public boolean onSubMenuSelected(SubMenuBuilder subMenu) { 138 if (!subMenu.hasVisibleItems()) return false; 139 140 // The window manager will give us a token. 141 new MenuDialogHelper(subMenu).show(null); 142 if (mCallback != null) { 143 mCallback.onOpenSubMenu(subMenu); 144 } 145 return true; 146 } 147 148 @Override 149 public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) { 150 if (mCallback != null) { 151 mCallback.onCloseMenu(menu, allMenusAreClosing); 152 } 153 } 154 155 int getItemIndexOffset() { 156 return mItemIndexOffset; 157 } 158 159 public void setItemIndexOffset(int offset) { 160 mItemIndexOffset = offset; 161 if (mMenuView != null) { 162 updateMenuView(false); 163 } 164 } 165 166 @Override 167 public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 168 mMenu.performItemAction(mAdapter.getItem(position), this, 0); 169 } 170 171 @Override 172 public boolean flagActionItems() { 173 return false; 174 } 175 176 public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) { 177 return false; 178 } 179 180 public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) { 181 return false; 182 } 183 184 public void saveHierarchyState(Bundle outState) { 185 SparseArray<Parcelable> viewStates = new SparseArray<Parcelable>(); 186 if (mMenuView != null) { 187 ((View) mMenuView).saveHierarchyState(viewStates); 188 } 189 outState.putSparseParcelableArray(VIEWS_TAG, viewStates); 190 } 191 192 public void restoreHierarchyState(Bundle inState) { 193 SparseArray<Parcelable> viewStates = inState.getSparseParcelableArray(VIEWS_TAG); 194 if (viewStates != null) { 195 ((View) mMenuView).restoreHierarchyState(viewStates); 196 } 197 } 198 199 public void setId(int id) { 200 mId = id; 201 } 202 203 @Override 204 public int getId() { 205 return mId; 206 } 207 208 @Override 209 public Parcelable onSaveInstanceState() { 210 if (mMenuView == null) { 211 return null; 212 } 213 214 Bundle state = new Bundle(); 215 saveHierarchyState(state); 216 return state; 217 } 218 219 @Override 220 public void onRestoreInstanceState(Parcelable state) { 221 restoreHierarchyState((Bundle) state); 222 } 223 224 private class MenuAdapter extends BaseAdapter { 225 private int mExpandedIndex = -1; 226 227 public MenuAdapter() { 228 findExpandedIndex(); 229 } 230 231 public int getCount() { 232 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 233 int count = items.size() - mItemIndexOffset; 234 if (mExpandedIndex < 0) { 235 return count; 236 } 237 return count - 1; 238 } 239 240 public MenuItemImpl getItem(int position) { 241 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 242 position += mItemIndexOffset; 243 if (mExpandedIndex >= 0 && position >= mExpandedIndex) { 244 position++; 245 } 246 return items.get(position); 247 } 248 249 public long getItemId(int position) { 250 // Since a menu item's ID is optional, we'll use the position as an 251 // ID for the item in the AdapterView 252 return position; 253 } 254 255 public View getView(int position, View convertView, ViewGroup parent) { 256 if (convertView == null) { 257 convertView = mInflater.inflate(mItemLayoutRes, parent, false); 258 } 259 260 MenuView.ItemView itemView = (MenuView.ItemView) convertView; 261 itemView.initialize(getItem(position), 0); 262 return convertView; 263 } 264 265 void findExpandedIndex() { 266 final MenuItemImpl expandedItem = mMenu.getExpandedItem(); 267 if (expandedItem != null) { 268 final ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 269 final int count = items.size(); 270 for (int i = 0; i < count; i++) { 271 final MenuItemImpl item = items.get(i); 272 if (item == expandedItem) { 273 mExpandedIndex = i; 274 return; 275 } 276 } 277 } 278 mExpandedIndex = -1; 279 } 280 281 @Override 282 public void notifyDataSetChanged() { 283 findExpandedIndex(); 284 super.notifyDataSetChanged(); 285 } 286 } 287} 288