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