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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 
     17 package com.android.internal.view.menu;
     18 
     19 import android.app.AlertDialog;
     20 import android.app.Dialog;
     21 import android.content.DialogInterface;
     22 import android.os.IBinder;
     23 import android.view.KeyEvent;
     24 import android.view.View;
     25 import android.view.Window;
     26 import android.view.WindowManager;
     27 
     28 /**
     29  * Helper for menus that appear as Dialogs (context and submenus).
     30  *
     31  * @hide
     32  */
     33 public 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