MenuDialogHelper.java revision 870a2b015645ef5086af6a5de31dc482e7193214 
1/*
2 * Copyright (C) 2006 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.app.AlertDialog;
20import android.app.Dialog;
21import android.content.DialogInterface;
22import android.os.IBinder;
23import android.view.KeyEvent;
24import android.view.View;
25import android.view.WindowManager;
26import android.widget.ListAdapter;
27
28/**
29 * Helper for menus that appear as Dialogs (context and submenus).
30 *
31 * @hide
32 */
33public class MenuDialogHelper implements DialogInterface.OnKeyListener, DialogInterface.OnClickListener {
34    private MenuBuilder mMenu;
35    private ListAdapter mAdapter;
36    private AlertDialog mDialog;
37
38    public MenuDialogHelper(MenuBuilder menu) {
39        mMenu = menu;
40    }
41
42    /**
43     * Shows menu as a dialog.
44     *
45     * @param windowToken Optional token to assign to the window.
46     */
47    public void show(IBinder windowToken) {
48        // Many references to mMenu, create local reference
49        final MenuBuilder menu = mMenu;
50
51        // Get an adapter for the menu item views
52        mAdapter = menu.getMenuAdapter(MenuBuilder.TYPE_DIALOG);
53
54        // Get the builder for the dialog
55        final AlertDialog.Builder builder = new AlertDialog.Builder(menu.getContext())
56                .setAdapter(mAdapter, this);
57
58        // Set the title
59        final View headerView = menu.getHeaderView();
60        if (headerView != null) {
61            // Menu's client has given a custom header view, use it
62            builder.setCustomTitle(headerView);
63        } else {
64            // Otherwise use the (text) title and icon
65            builder.setIcon(menu.getHeaderIcon()).setTitle(menu.getHeaderTitle());
66        }
67
68        // Set the key listener
69        builder.setOnKeyListener(this);
70
71        // Since this is for a menu, disable the recycling of views
72        // This is done by the menu framework anyway
73        builder.setRecycleOnMeasureEnabled(false);
74
75        // Show the menu
76        mDialog = builder.create();
77
78        WindowManager.LayoutParams lp = mDialog.getWindow().getAttributes();
79        lp.type = WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG;
80        if (windowToken != null) {
81            lp.token = windowToken;
82        }
83        lp.flags |= WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
84
85        mDialog.show();
86    }
87
88    public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
89        /*
90         * Close menu on key down (more responsive, and there's no way to cancel
91         * a key press so no point having it on key up. Note: This is also
92         * needed because when a top-level menu item that shows a submenu is
93         * invoked by chording, this onKey method will be called with the menu
94         * up event.
95         */
96        if (event.getAction() == KeyEvent.ACTION_DOWN && (keyCode == KeyEvent.KEYCODE_MENU)
97                || (keyCode == KeyEvent.KEYCODE_BACK)) {
98            mMenu.close(true);
99            dialog.dismiss();
100            return true;
101        }
102
103        // Menu shortcut matching
104        return mMenu.performShortcut(keyCode, event, 0);
105
106    }
107
108    /**
109     * Dismisses the menu's dialog.
110     *
111     * @see Dialog#dismiss()
112     */
113    public void dismiss() {
114        if (mDialog != null) {
115            mDialog.dismiss();
116        }
117    }
118
119    public void onClick(DialogInterface dialog, int which) {
120        mMenu.performItemAction((MenuItemImpl) mAdapter.getItem(which), 0);
121    }
122
123}
124