ListMenuPresenter.java revision 51195b56ff6d3d589abefde27f0a99b5a9a04ff8
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 17package com.android.internal.view.menu; 18 19import android.content.Context; 20import android.os.Bundle; 21import android.os.Parcelable; 22import android.util.SparseArray; 23import android.view.ContextThemeWrapper; 24import android.view.LayoutInflater; 25import android.view.View; 26import android.view.ViewGroup; 27import android.widget.AdapterView; 28import android.widget.BaseAdapter; 29import android.widget.ListAdapter; 30 31import java.util.ArrayList; 32 33/** 34 * MenuPresenter for list-style menus. 35 */ 36public class ListMenuPresenter implements MenuPresenter, AdapterView.OnItemClickListener { 37 Context mContext; 38 LayoutInflater mInflater; 39 MenuBuilder mMenu; 40 41 ExpandedMenuView mMenuView; 42 43 private int mItemIndexOffset; 44 int mThemeRes; 45 int mItemLayoutRes; 46 47 private Callback mCallback; 48 private MenuAdapter mAdapter; 49 50 public static final String VIEWS_TAG = "android:menu:list"; 51 52 /** 53 * Construct a new ListMenuPresenter. 54 * @param context Context to use for theming. This will supersede the context provided 55 * to initForMenu when this presenter is added. 56 * @param itemLayoutRes Layout resource for individual item views. 57 */ 58 public ListMenuPresenter(Context context, int itemLayoutRes) { 59 this(itemLayoutRes, 0); 60 mContext = context; 61 } 62 63 /** 64 * Construct a new ListMenuPresenter. 65 * @param itemLayoutRes Layout resource for individual item views. 66 * @param themeRes Resource ID of a theme to use for views. 67 */ 68 public ListMenuPresenter(int itemLayoutRes, int themeRes) { 69 mItemLayoutRes = itemLayoutRes; 70 mThemeRes = themeRes; 71 } 72 73 @Override 74 public void initForMenu(Context context, MenuBuilder menu) { 75 if (mThemeRes != 0) { 76 mContext = new ContextThemeWrapper(context, mThemeRes); 77 } else if (mContext == null) { 78 mContext = context; 79 } 80 mInflater = LayoutInflater.from(mContext); 81 mMenu = menu; 82 } 83 84 @Override 85 public MenuView getMenuView(ViewGroup root) { 86 if (mMenuView == null) { 87 mMenuView = (ExpandedMenuView) mInflater.inflate( 88 com.android.internal.R.layout.expanded_menu_layout, root, false); 89 if (mAdapter == null) { 90 mAdapter = new MenuAdapter(); 91 } 92 mMenuView.setAdapter(mAdapter); 93 mMenuView.setOnItemClickListener(this); 94 } 95 return mMenuView; 96 } 97 98 /** 99 * Call this instead of getMenuView if you want to manage your own ListView. 100 * For proper operation, the ListView hosting this adapter should add 101 * this presenter as an OnItemClickListener. 102 * 103 * @return A ListAdapter containing the items in the menu. 104 */ 105 public ListAdapter getAdapter() { 106 if (mAdapter == null) { 107 mAdapter = new MenuAdapter(); 108 } 109 return mAdapter; 110 } 111 112 @Override 113 public void updateMenuView(boolean cleared) { 114 if (mAdapter != null) mAdapter.notifyDataSetChanged(); 115 } 116 117 @Override 118 public void setCallback(Callback cb) { 119 mCallback = cb; 120 } 121 122 @Override 123 public boolean onSubMenuSelected(SubMenuBuilder subMenu) { 124 if (!subMenu.hasVisibleItems()) return false; 125 126 // The window manager will give us a token. 127 new MenuDialogHelper(subMenu).show(null); 128 if (mCallback != null) { 129 mCallback.onOpenSubMenu(subMenu); 130 } 131 return true; 132 } 133 134 @Override 135 public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) { 136 if (mCallback != null) { 137 mCallback.onCloseMenu(menu, allMenusAreClosing); 138 } 139 } 140 141 int getItemIndexOffset() { 142 return mItemIndexOffset; 143 } 144 145 public void setItemIndexOffset(int offset) { 146 mItemIndexOffset = offset; 147 if (mMenuView != null) { 148 updateMenuView(false); 149 } 150 } 151 152 @Override 153 public void onItemClick(AdapterView<?> parent, View view, int position, long id) { 154 mMenu.performItemAction(mAdapter.getItem(position), 0); 155 } 156 157 @Override 158 public boolean flagActionItems() { 159 return false; 160 } 161 162 public boolean expandItemActionView(MenuBuilder menu, MenuItemImpl item) { 163 return false; 164 } 165 166 public boolean collapseItemActionView(MenuBuilder menu, MenuItemImpl item) { 167 return false; 168 } 169 170 public void saveHierarchyState(Bundle outState) { 171 SparseArray<Parcelable> viewStates = new SparseArray<Parcelable>(); 172 if (mMenuView != null) { 173 ((View) mMenuView).saveHierarchyState(viewStates); 174 } 175 outState.putSparseParcelableArray(VIEWS_TAG, viewStates); 176 } 177 178 public void restoreHierarchyState(Bundle inState) { 179 SparseArray<Parcelable> viewStates = inState.getSparseParcelableArray(VIEWS_TAG); 180 if (viewStates != null) { 181 ((View) mMenuView).restoreHierarchyState(viewStates); 182 } 183 } 184 185 private class MenuAdapter extends BaseAdapter { 186 public int getCount() { 187 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 188 return items.size() - mItemIndexOffset; 189 } 190 191 public MenuItemImpl getItem(int position) { 192 ArrayList<MenuItemImpl> items = mMenu.getNonActionItems(); 193 return items.get(position + mItemIndexOffset); 194 } 195 196 public long getItemId(int position) { 197 // Since a menu item's ID is optional, we'll use the position as an 198 // ID for the item in the AdapterView 199 return position; 200 } 201 202 public View getView(int position, View convertView, ViewGroup parent) { 203 if (convertView == null) { 204 convertView = mInflater.inflate(mItemLayoutRes, parent, false); 205 } 206 207 MenuView.ItemView itemView = (MenuView.ItemView) convertView; 208 itemView.initialize(getItem(position), 0); 209 return convertView; 210 } 211 } 212} 213