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 * Helper for menus that appear as Dialogs (context and submenus).
30 *
31 * @hide
32 */
33public class MenuDialogHelper implements DialogInterface.OnKeyListener,
34        DialogInterface.OnClickListener,
35        DialogInterface.OnDismissListener,
36        MenuPresenter.Callback {
37    private MenuBuilder mMenu;
38    private AlertDialog mDialog;
39    ListMenuPresenter mPresenter;
40    private MenuPresenter.Callback mPresenterCallback;
41
42    public MenuDialogHelper(MenuBuilder menu) {
43        mMenu = menu;
44    }
45
46    /**
47     * Shows menu as a dialog.
48     *
49     * @param windowToken Optional token to assign to the window.
50     */
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
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);
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    public void setPresenterCallback(MenuPresenter.Callback cb) {
129        mPresenterCallback = cb;
130    }
131
132    /**
133     * Dismisses the menu's dialog.
134     *
135     * @see Dialog#dismiss()
136     */
137    public void dismiss() {
138        if (mDialog != null) {
139            mDialog.dismiss();
140        }
141    }
142
143    @Override
144    public void onDismiss(DialogInterface dialog) {
145        mPresenter.onCloseMenu(mMenu, true);
146    }
147
148    @Override
149    public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
150        if (allMenusAreClosing || menu == mMenu) {
151            dismiss();
152        }
153        if (mPresenterCallback != null) {
154            mPresenterCallback.onCloseMenu(menu, allMenusAreClosing);
155        }
156    }
157
158    @Override
159    public boolean onOpenSubMenu(MenuBuilder subMenu) {
160        if (mPresenterCallback != null) {
161            return mPresenterCallback.onOpenSubMenu(subMenu);
162        }
163        return false;
164    }
165
166    public void onClick(DialogInterface dialog, int which) {
167        mMenu.performItemAction((MenuItemImpl) mPresenter.getAdapter().getItem(which), 0);
168    }
169}
170