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      1 /*
      2  * Copyright (C) 2010 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.graphics;
     18 
     19 import com.android.layoutlib.bridge.impl.DelegateManager;
     20 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
     21 
     22 import java.awt.Composite;
     23 
     24 /**
     25  * Delegate implementing the native methods of android.graphics.Xfermode
     26  *
     27  * Through the layoutlib_create tool, the original native methods of Xfermode have been replaced
     28  * by calls to methods of the same name in this delegate class.
     29  *
     30  * This class behaves like the original native implementation, but in Java, keeping previously
     31  * native data into its own objects and mapping them to int that are sent back and forth between
     32  * it and the original Xfermode class.
     33  *
     34  * This also serve as a base class for all Xfermode delegate classes.
     35  *
     36  * @see DelegateManager
     37  *
     38  */
     39 public abstract class Xfermode_Delegate {
     40 
     41     // ---- delegate manager ----
     42     protected static final DelegateManager<Xfermode_Delegate> sManager =
     43             new DelegateManager<Xfermode_Delegate>(Xfermode_Delegate.class);
     44 
     45     // ---- delegate helper data ----
     46 
     47     // ---- delegate data ----
     48 
     49     // ---- Public Helper methods ----
     50 
     51     public static Xfermode_Delegate getDelegate(long native_instance) {
     52         return sManager.getDelegate(native_instance);
     53     }
     54 
     55     public abstract Composite getComposite(int alpha);
     56     public abstract boolean isSupported();
     57     public abstract String getSupportMessage();
     58 
     59 
     60     // ---- native methods ----
     61 
     62     @LayoutlibDelegate
     63     /*package*/ static void finalizer(long native_instance) {
     64         sManager.removeJavaReferenceFor(native_instance);
     65     }
     66 
     67     // ---- Private delegate/helper methods ----
     68 
     69 }
     70