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      1 /*
      2  * Copyright (C) 2018 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.text;
     18 
     19 import com.android.layoutlib.bridge.impl.DelegateManager;
     20 import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
     21 
     22 import android.graphics.Rect;
     23 import android.graphics.text.LineBreaker_Delegate.Builder;
     24 import android.graphics.text.LineBreaker_Delegate.Run;
     25 
     26 import libcore.util.NativeAllocationRegistry_Delegate;
     27 
     28 /**
     29  * Delegate that provides implementation for native methods in
     30  * {@link android.graphics.text.MeasuredText}
     31  * <p/>
     32  * Through the layoutlib_create tool, selected methods of StaticLayout have been replaced
     33  * by calls to methods of the same name in this delegate class.
     34  *
     35  */
     36 public class MeasuredText_Delegate {
     37 
     38     // ---- Builder delegate manager ----
     39     protected static final DelegateManager<MeasuredText_Delegate> sManager =
     40             new DelegateManager<>(MeasuredText_Delegate.class);
     41     private static long sFinalizer = -1;
     42 
     43     protected long mNativeBuilderPtr;
     44 
     45     @LayoutlibDelegate
     46     /*package*/ static float nGetWidth(long nativePtr, int start, int end) {
     47         // Ignore as it is not used for the layoutlib implementation
     48         return 0.0f;
     49     }
     50 
     51     @LayoutlibDelegate
     52     /*package*/ static long nGetReleaseFunc() {
     53         synchronized (MeasuredText_Delegate.class) {
     54             if (sFinalizer == -1) {
     55                 sFinalizer = NativeAllocationRegistry_Delegate.createFinalizer(
     56                         sManager::removeJavaReferenceFor);
     57             }
     58         }
     59         return sFinalizer;
     60     }
     61 
     62     @LayoutlibDelegate
     63     /*package*/ static int nGetMemoryUsage(long nativePtr) {
     64         // Ignore as it is not used for the layoutlib implementation
     65         return 0;
     66     }
     67 
     68     @LayoutlibDelegate
     69     /*package*/ static void nGetBounds(long nativePtr, char[] buf, int start, int end, Rect rect) {
     70         // Ignore as it is not used for the layoutlib implementation
     71     }
     72 
     73     @LayoutlibDelegate
     74     /*package*/ static float nGetCharWidthAt(long nativePtr, int offset) {
     75         // Ignore as it is not used for the layoutlib implementation
     76         return 0.0f;
     77     }
     78 
     79     public static void computeRuns(long measuredTextPtr, Builder staticLayoutBuilder) {
     80         MeasuredText_Delegate delegate = sManager.getDelegate(measuredTextPtr);
     81         if (delegate == null) {
     82             return;
     83         }
     84         MeasuredText_Builder_Delegate builder =
     85                 MeasuredText_Builder_Delegate.sBuilderManager.getDelegate(delegate.mNativeBuilderPtr);
     86         if (builder == null) {
     87             return;
     88         }
     89         for (Run run: builder.mRuns) {
     90             run.addTo(staticLayoutBuilder);
     91         }
     92     }
     93 }