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      1 /*
      2  * Copyright (C) 2013 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 androidx.appcompat.view.menu;
     18 
     19 import android.app.Dialog;
     20 import android.content.DialogInterface;
     21 import android.os.IBinder;
     22 import android.view.KeyEvent;
     23 import android.view.View;
     24 import android.view.Window;
     25 import android.view.WindowManager;
     26 
     27 import androidx.appcompat.R;
     28 import androidx.appcompat.app.AlertDialog;
     29 
     30 /**
     31  * Helper for menus that appear as Dialogs (context and submenus).
     32  */
     33 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                 R.layout.abc_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     @Override
     93     public boolean onKey(DialogInterface dialog, int keyCode, KeyEvent event) {
     94         if (keyCode == KeyEvent.KEYCODE_MENU || keyCode == KeyEvent.KEYCODE_BACK) {
     95             if (event.getAction() == KeyEvent.ACTION_DOWN
     96                     && event.getRepeatCount() == 0) {
     97                 Window win = mDialog.getWindow();
     98                 if (win != null) {
     99                     View decor = win.getDecorView();
    100                     if (decor != null) {
    101                         KeyEvent.DispatcherState ds = decor.getKeyDispatcherState();
    102                         if (ds != null) {
    103                             ds.startTracking(event, this);
    104                             return true;
    105                         }
    106                     }
    107                 }
    108             } else if (event.getAction() == KeyEvent.ACTION_UP && !event.isCanceled()) {
    109                 Window win = mDialog.getWindow();
    110                 if (win != null) {
    111                     View decor = win.getDecorView();
    112                     if (decor != null) {
    113                         KeyEvent.DispatcherState ds = decor.getKeyDispatcherState();
    114                         if (ds != null && ds.isTracking(event)) {
    115                             mMenu.close(true);
    116                             dialog.dismiss();
    117                             return true;
    118                         }
    119                     }
    120                 }
    121             }
    122         }
    123 
    124         // Menu shortcut matching
    125         return mMenu.performShortcut(keyCode, event, 0);
    126 
    127     }
    128 
    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     public void dismiss() {
    139         if (mDialog != null) {
    140             mDialog.dismiss();
    141         }
    142     }
    143 
    144     @Override
    145     public void onDismiss(DialogInterface dialog) {
    146         mPresenter.onCloseMenu(mMenu, true);
    147     }
    148 
    149     @Override
    150     public void onCloseMenu(MenuBuilder menu, boolean allMenusAreClosing) {
    151         if (allMenusAreClosing || menu == mMenu) {
    152             dismiss();
    153         }
    154         if (mPresenterCallback != null) {
    155             mPresenterCallback.onCloseMenu(menu, allMenusAreClosing);
    156         }
    157     }
    158 
    159     @Override
    160     public boolean onOpenSubMenu(MenuBuilder subMenu) {
    161         if (mPresenterCallback != null) {
    162             return mPresenterCallback.onOpenSubMenu(subMenu);
    163         }
    164         return false;
    165     }
    166 
    167     @Override
    168     public void onClick(DialogInterface dialog, int which) {
    169         mMenu.performItemAction((MenuItemImpl) mPresenter.getAdapter().getItem(which), 0);
    170     }
    171 }
    172