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
17package android.support.v7.internal.widget;
18
19import android.content.res.ColorStateList;
20import android.graphics.Color;
21import android.graphics.PorterDuff;
22import android.graphics.PorterDuffColorFilter;
23import android.graphics.drawable.Drawable;
24
25/**
26 * A {@link DrawableWrapper} which updates it's color filter using a {@link ColorStateList}.
27 */
28class TintDrawableWrapper extends DrawableWrapper {
29
30    private final ColorStateList mTintStateList;
31    private final PorterDuff.Mode mTintMode;
32
33    private int mCurrentColor;
34
35    public TintDrawableWrapper(Drawable drawable, ColorStateList tintStateList) {
36        this(drawable, tintStateList, TintManager.DEFAULT_MODE);
37    }
38
39    public TintDrawableWrapper(Drawable drawable, ColorStateList tintStateList,
40            PorterDuff.Mode tintMode) {
41        super(drawable);
42        mTintStateList = tintStateList;
43        mTintMode = tintMode;
44    }
45
46    @Override
47    public boolean isStateful() {
48        return (mTintStateList != null && mTintStateList.isStateful()) || super.isStateful();
49    }
50
51    @Override
52    public boolean setState(int[] stateSet) {
53        boolean handled = super.setState(stateSet);
54        handled = updateTint(stateSet) || handled;
55        return handled;
56    }
57
58    private boolean updateTint(int[] state) {
59        if (mTintStateList != null) {
60            final int color = mTintStateList.getColorForState(state, mCurrentColor);
61            if (color != mCurrentColor) {
62                if (color != Color.TRANSPARENT) {
63                    setColorFilter(color, mTintMode);
64                } else {
65                    clearColorFilter();
66                }
67                mCurrentColor = color;
68                return true;
69            }
70        }
71        return false;
72    }
73
74}
75