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      1 /*
      2  * Copyright (C) 2014 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 android.view;
     18 
     19 import android.content.Context;
     20 import com.android.ide.common.rendering.api.LayoutLog;
     21 import com.android.ide.common.rendering.api.ViewInfo;
     22 import com.android.internal.view.menu.BridgeMenuItemImpl;
     23 import com.android.internal.view.menu.MenuView;
     24 import com.android.layoutlib.bridge.Bridge;
     25 import com.android.layoutlib.bridge.android.BridgeContext;
     26 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
     27 
     28 import android.util.AttributeSet;
     29 
     30 /**
     31  * Delegate used to provide new implementation of a select few methods of {@link MenuInflater}
     32  * <p/>
     33  * Through the layoutlib_create tool, the original  methods of MenuInflater have been
     34  * replaced by calls to methods of the same name in this delegate class.
     35  * <p/>
     36  * The main purpose of the class is to get the view key from the menu xml parser and add it to
     37  * the menu item. The view key is used by the IDE to match the individual view elements to the
     38  * corresponding xml tag in the menu/layout file.
     39  * <p/>
     40  * For Menus, the views may be reused and the {@link MenuItem} is a better object to hold the
     41  * view key than the {@link MenuView.ItemView}. At the time of computation of the rest of {@link
     42  * ViewInfo}, we check the corresponding view key in the menu item for the view and add it
     43  */
     44 public class MenuInflater_Delegate {
     45     @LayoutlibDelegate
     46     /*package*/ static void registerMenu(MenuInflater thisInflater, MenuItem menuItem,
     47             AttributeSet attrs) {
     48         if (menuItem instanceof BridgeMenuItemImpl) {
     49             Context context = thisInflater.getContext();
     50             context = BridgeContext.getBaseContext(context);
     51             if (context instanceof BridgeContext) {
     52                 Object viewKey = BridgeInflater.getViewKeyFromParser(
     53                         attrs, ((BridgeContext) context), null, false);
     54                 ((BridgeMenuItemImpl) menuItem).setViewCookie(viewKey);
     55                 return;
     56             }
     57         }
     58 
     59         String menuItemName = menuItem != null ? menuItem.getClass().getName() : null;
     60         if (menuItemName == null ||
     61                 !menuItemName.startsWith("android.support.") ||
     62                 !menuItemName.startsWith("androidx.")) {
     63             // This means that Bridge did not take over the instantiation of some object properly.
     64             // This is most likely a bug in the LayoutLib code.
     65             // We suppress this error for AppCompat menus since we do not support them in the menu
     66             // editor yet.
     67             Bridge.getLog().warning(LayoutLog.TAG_BROKEN,
     68                     "Action Bar Menu rendering may be incorrect.", null);
     69         }
     70 
     71     }
     72 
     73     @LayoutlibDelegate
     74     /*package*/ static void registerMenu(MenuInflater thisInflater, SubMenu subMenu,
     75             AttributeSet parser) {
     76         registerMenu(thisInflater, subMenu.getItem(), parser);
     77     }
     78 
     79 }
     80