Clean up tinted ImageView subclasses

chrome/android/java/src/org/chromium/chrome/browser/widget/TintedImageView.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.widget;
 
 import android.content.Context;
 import android.content.res.ColorStateList;
-import android.content.res.TypedArray;
-import android.graphics.PorterDuff;
+import android.graphics.Canvas;
 import android.support.v7.widget.AppCompatImageView;
 import android.util.AttributeSet;
 
-import org.chromium.chrome.R;
+import org.chromium.chrome.browser.widget.ImageViewTinter.ImageViewTinterOwner;
 
 /**
- * Implementation of ImageView that allows to tint the color of the image view for all
- * image view states using chrome:chrometint attribute in XML.
+ * Implementation of ImageView that allows tinting its Drawable for all states.
+ * For usage, see {@link ImageViewTinter}.
  */
-public class TintedImageView extends AppCompatImageView {
-    private ColorStateList mTint;
+public class TintedImageView extends AppCompatImageView implements ImageViewTinterOwner {
+    private ImageViewTinter mTinter;
 
     public TintedImageView(Context context) {
-        super(context);
+        this(context, null);
     }
 
     public TintedImageView(Context context, AttributeSet attrs) {
-        super(context, attrs);
-        init(context, attrs, 0);
+        this(context, attrs, 0);
     }
 
     public TintedImageView(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs, defStyle);
-        init(context, attrs, defStyle);
-    }
-
-    private void init(Context context, AttributeSet attrs, int defStyle) {
-        TypedArray a = context.obtainStyledAttributes(
-                attrs, R.styleable.TintedImage, defStyle, 0);
-        setTintInternal(a.getColorStateList(R.styleable.TintedImage_chrometint));
-        a.recycle();
+        mTinter = new ImageViewTinter(this, attrs, defStyle);
     }
 
     @Override
-    protected void drawableStateChanged() {
+    public void drawableStateChanged() {
         super.drawableStateChanged();
-        updateTintColor();
+        mTinter.drawableStateChanged();
     }
 
-    /**
-     * Sets the tint color for the given ImageView for all view states.
-     * @param tint The set of colors to use to color the ImageView.
-     */
-    public void setTint(ColorStateList tint) {
-        if (mTint == tint) return;
-        setTintInternal(tint);
-        updateTintColor();
+    @Override
+    public void setTint(ColorStateList tintList) {
+        mTinter.setTint(tintList);
     }
 
-    private void setTintInternal(ColorStateList tint) {
-        mTint = tint;
-    }
-
-    private void updateTintColor() {
-        if (mTint == null) {
-            clearColorFilter();
-            return;
-        }
-        setColorFilter(mTint.getColorForState(getDrawableState(), 0), PorterDuff.Mode.SRC_IN);
+    @Override
+    public void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
     }
 }