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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 import android.widget.ListAdapter;
     28 
     29 /**
     30  * Helper for menus that appear as Dialogs (context and submenus).
     31  *
     32  * @hide
     33  */
     34 public class MenuDialogHelper implements DialogInterface.OnKeyListener, DialogInterface.OnClickListener {
     35     private MenuBuilder mMenu;
     36     private ListAdapter mAdapter;
     37     private AlertDialog mDialog;
     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 an adapter for the menu item views
     53         mAdapter = menu.getMenuAdapter(MenuBuilder.TYPE_DIALOG);
     54 
     55         // Get the builder for the dialog
     56         final AlertDialog.Builder builder = new AlertDialog.Builder(menu.getContext())
     57                 .setAdapter(mAdapter, this);
     58 
     59         // Set the title
     60         final View headerView = menu.getHeaderView();
     61         if (headerView != null) {
     62             // Menu's client has given a custom header view, use it
     63             builder.setCustomTitle(headerView);
     64         } else {
     65             // Otherwise use the (text) title and icon
     66             builder.setIcon(menu.getHeaderIcon()).setTitle(menu.getHeaderTitle());
     67         }
     68 
     69         // Set the key listener
     70         builder.setOnKeyListener(this);
     71 
     72         // Since this is for a menu, disable the recycling of views
     73         // This is done by the menu framework anyway
     74         builder.setRecycleOnMeasureEnabled(false);
     75 
     76         // Show the menu
     77         mDialog = builder.create();
     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);
    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     /**
    126      * Dismisses the menu's dialog.
    127      *
    128      * @see Dialog#dismiss()
    129      */
    130     public void dismiss() {
    131         if (mDialog != null) {
    132             mDialog.dismiss();
    133         }
    134     }
    135 
    136     public void onClick(DialogInterface dialog, int which) {
    137         mMenu.performItemAction((MenuItemImpl) mAdapter.getItem(which), 0);
    138     }
    139 
    140 }
    141