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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 package org.chromium.content.browser.input;
      6 
      7 import android.content.Context;
      8 import android.content.res.Resources;
      9 import android.content.res.TypedArray;
     10 import android.graphics.Bitmap;
     11 import android.graphics.BitmapFactory;
     12 import android.graphics.Canvas;
     13 import android.graphics.drawable.Drawable;
     14 
     15 import org.chromium.base.CalledByNative;
     16 import org.chromium.base.JNINamespace;
     17 
     18 /**
     19  * Helper class for retrieving resources related to selection handles.
     20  */
     21 @JNINamespace("content")
     22 public class HandleViewResources {
     23     private static final int[] LEFT_HANDLE_ATTRS = {
     24         android.R.attr.textSelectHandleLeft,
     25     };
     26 
     27     private static final int[] CENTER_HANDLE_ATTRS = {
     28         android.R.attr.textSelectHandle,
     29     };
     30 
     31     private static final int[] RIGHT_HANDLE_ATTRS = {
     32         android.R.attr.textSelectHandleRight,
     33     };
     34 
     35     public static Drawable getLeftHandleDrawable(Context context) {
     36         return getHandleDrawable(context, LEFT_HANDLE_ATTRS);
     37     }
     38 
     39     public static Drawable getCenterHandleDrawable(Context context) {
     40         return getHandleDrawable(context, CENTER_HANDLE_ATTRS);
     41     }
     42 
     43     public static Drawable getRightHandleDrawable(Context context) {
     44         return getHandleDrawable(context, RIGHT_HANDLE_ATTRS);
     45     }
     46 
     47     private static Drawable getHandleDrawable(Context context, final int[] attrs) {
     48         TypedArray a = context.getTheme().obtainStyledAttributes(attrs);
     49         Drawable drawable = a.getDrawable(0);
     50         if (drawable == null) {
     51             // If themed resource lookup fails, fall back to using the Context's
     52             // resources for attribute lookup.
     53             try {
     54                 drawable = context.getResources().getDrawable(a.getResourceId(0, 0));
     55             } catch (Resources.NotFoundException e) {
     56                 // The caller should handle the null return case appropriately.
     57             }
     58         }
     59         a.recycle();
     60         return drawable;
     61     }
     62 
     63     private static Bitmap getHandleBitmap(Context context, final int[] attrs) {
     64         // TODO(jdduke): Properly derive and apply theme color.
     65         TypedArray a = context.getTheme().obtainStyledAttributes(attrs);
     66         final int resId = a.getResourceId(a.getIndex(0), 0);
     67         final Resources res = a.getResources();
     68         a.recycle();
     69 
     70         final Bitmap.Config config = Bitmap.Config.ARGB_8888;
     71         final BitmapFactory.Options options = new BitmapFactory.Options();
     72         options.inJustDecodeBounds = false;
     73         options.inPreferredConfig = config;
     74         Bitmap bitmap = BitmapFactory.decodeResource(res, resId, options);
     75         if (bitmap != null) return bitmap;
     76 
     77         // If themed resource lookup fails, fall back to using the Context's
     78         // resources for attribute lookup.
     79         if (res != context.getResources()) {
     80             bitmap = BitmapFactory.decodeResource(context.getResources(), resId, options);
     81             if (bitmap != null) return bitmap;
     82         }
     83 
     84         Drawable drawable = getHandleDrawable(context, attrs);
     85         assert drawable != null;
     86 
     87         final int width = drawable.getIntrinsicWidth();
     88         final int height = drawable.getIntrinsicHeight();
     89         Bitmap canvasBitmap = Bitmap.createBitmap(width, height, config);
     90         Canvas canvas = new Canvas(canvasBitmap);
     91         drawable.setBounds(0, 0, width, height);
     92         drawable.draw(canvas);
     93         return canvasBitmap;
     94     }
     95 
     96     @CalledByNative
     97     private static Bitmap getLeftHandleBitmap(Context context) {
     98         return getHandleBitmap(context, LEFT_HANDLE_ATTRS);
     99     }
    100 
    101     @CalledByNative
    102     private static Bitmap getCenterHandleBitmap(Context context) {
    103         return getHandleBitmap(context, CENTER_HANDLE_ATTRS);
    104     }
    105 
    106     @CalledByNative
    107     private static Bitmap getRightHandleBitmap(Context context) {
    108         return getHandleBitmap(context, RIGHT_HANDLE_ATTRS);
    109     }
    110 }
    111