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 
17 package com.android.internal.view.menu;
18 
19 import android.app.AlertDialog;
20 import android.app.Dialog;
21 import android.compat.annotation.UnsupportedAppUsage;
22 import android.content.DialogInterface;
23 import android.os.IBinder;
24 import android.view.KeyEvent;
25 import android.view.View;
26 import android.view.Window;
27 import android.view.WindowManager;
28 
29 /**
30  * Presents a menu as a modal dialog.
31  */
32 public class MenuDialogHelper implements MenuHelper, DialogInterface.OnKeyListener,
33         DialogInterface.OnClickListener, DialogInterface.OnDismissListener,
34         MenuPresenter.Callback {
35     private MenuBuilder mMenu;
36     private AlertDialog mDialog;
37     ListMenuPresenter mPresenter;
38     private MenuPresenter.Callback mPresenterCallback;
39 
40     @UnsupportedAppUsage
MenuDialogHelper(MenuBuilder menu)41     public MenuDialogHelper(MenuBuilder menu) {
42         mMenu = menu;
43     }
44 
45     /**
46      * Shows menu as a dialog.
47      *
48      * @param windowToken Optional token to assign to the window.
49      */
50     @UnsupportedAppUsage
show(IBinder windowToken)51     public void show(IBinder windowToken) {
52         // Many references to mMenu, create local reference
53         final MenuBuilder menu = mMenu;
54 
55         // Get the builder for the dialog
56         final AlertDialog.Builder builder = new AlertDialog.Builder(menu.getContext());
57 
58         mPresenter = new ListMenuPresenter(builder.getContext(),
59                 com.android.internal.R.layout.list_menu_item_layout);
60 
61         mPresenter.setCallback(this);
62         mMenu.addMenuPresenter(mPresenter);
63         builder.setAdapter(mPresenter.getAdapter(), this);
64 
65         // Set the title
66         final View headerView = menu.getHeaderView();
67         if (headerView != null) {
68             // Menu's client has given a custom header view, use it
69             builder.setCustomTitle(headerView);
70         } else {
71             // Otherwise use the (text) title and icon
72             builder.setIcon(menu.getHeaderIcon()).setTitle(menu.getHeaderTitle());
73         }
74 
75         // Set the key listener
76         builder.setOnKeyListener(this);
77 
78         // Show the menu
79         mDialog = builder.create();
80         mDialog.setOnDismissListener(this);
81 
82         WindowManager.LayoutParams lp = mDialog.getWindow().getAttributes();
83         lp.type = WindowManager.LayoutParams.TYPE_APPLICATION_ATTACHED_DIALOG;
84         if (windowToken != null) {
85             lp.token = windowToken;
86         }
87         lp.flags |= WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
88 
89         mDialog.show();
90     }
91 
onKey(DialogInterface dialog, int keyCode, KeyEvent event)92     public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
93         if (keyCode == KeyEvent.KEYCODE_MENU || keyCode == KeyEvent.KEYCODE_BACK) {
94             if (event.getAction() == KeyEvent.ACTION_DOWN
95                     && event.getRepeatCount() == 0) {
96                 Window win = mDialog.getWindow();
97                 if (win != null) {
98                     View decor = win.getDecorView();
99                     if (decor != null) {
100                         KeyEvent.DispatcherState ds = decor.getKeyDispatcherState();
101                         if (ds != null) {
102                             ds.startTracking(event, this);
103                             return true;
104                         }
105                     }
106                 }
107             } else if (event.getAction() == KeyEvent.ACTION_UP && !event.isCanceled()) {
108                 Window win = mDialog.getWindow();
109                 if (win != null) {
110                     View decor = win.getDecorView();
111                     if (decor != null) {
112                         KeyEvent.DispatcherState ds = decor.getKeyDispatcherState();
113                         if (ds != null && ds.isTracking(event)) {
114                             mMenu.close(true /* closeAllMenus */);
115                             dialog.dismiss();
116                             return true;
117                         }
118                     }
119                 }
120             }
121         }
122 
123         // Menu shortcut matching
124         return mMenu.performShortcut(keyCode, event, 0);
125 
126     }
127 
128     @Override
setPresenterCallback(MenuPresenter.Callback cb)129     public void setPresenterCallback(MenuPresenter.Callback cb) {
130         mPresenterCallback = cb;
131     }
132 
133     /**
134      * Dismisses the menu's dialog.
135      *
136      * @see Dialog#dismiss()
137      */
138     @UnsupportedAppUsage
139     @Override
dismiss()140     public void dismiss() {
141         if (mDialog != null) {
142             mDialog.dismiss();
143         }
144     }
145 
146     @Override
onDismiss(DialogInterface dialog)147     public void onDismiss(DialogInterface dialog) {
148         mPresenter.onCloseMenu(mMenu, true);
149     }
150 
151     @Override
onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing)152     public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
153         if (allMenusAreClosing || menu == mMenu) {
154             dismiss();
155         }
156         if (mPresenterCallback != null) {
157             mPresenterCallback.onCloseMenu(menu, allMenusAreClosing);
158         }
159     }
160 
161     @Override
onOpenSubMenu(MenuBuilder subMenu)162     public boolean onOpenSubMenu(MenuBuilder subMenu) {
163         if (mPresenterCallback != null) {
164             return mPresenterCallback.onOpenSubMenu(subMenu);
165         }
166         return false;
167     }
168 
onClick(DialogInterface dialog, int which)169     public void onClick(DialogInterface dialog, int which) {
170         mMenu.performItemAction((MenuItemImpl) mPresenter.getAdapter().getItem(which), 0);
171     }
172 }
173