1/*
2 * Copyright (C) 2015 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.Context;
20import android.content.res.ColorStateList;
21import android.content.res.TypedArray;
22import android.graphics.Color;
23import android.support.v4.graphics.ColorUtils;
24import android.util.TypedValue;
25
26/**
27 * @hide
28 */
29public class ThemeUtils {
30
31    private static final ThreadLocal<TypedValue> TL_TYPED_VALUE = new ThreadLocal<>();
32
33    static final int[] DISABLED_STATE_SET = new int[]{-android.R.attr.state_enabled};
34    static final int[] FOCUSED_STATE_SET = new int[]{android.R.attr.state_focused};
35    static final int[] ACTIVATED_STATE_SET = new int[]{android.R.attr.state_activated};
36    static final int[] PRESSED_STATE_SET = new int[]{android.R.attr.state_pressed};
37    static final int[] CHECKED_STATE_SET = new int[]{android.R.attr.state_checked};
38    static final int[] SELECTED_STATE_SET = new int[]{android.R.attr.state_selected};
39    static final int[] NOT_PRESSED_OR_FOCUSED_STATE_SET = new int[]{
40            -android.R.attr.state_pressed, -android.R.attr.state_focused};
41    static final int[] EMPTY_STATE_SET = new int[0];
42
43    private static final int[] TEMP_ARRAY = new int[1];
44
45    public static ColorStateList createDisabledStateList(int textColor, int disabledTextColor) {
46        // Now create a new ColorStateList with the default color, and the new disabled
47        // color
48        final int[][] states = new int[2][];
49        final int[] colors = new int[2];
50        int i = 0;
51
52        // Disabled state
53        states[i] = DISABLED_STATE_SET;
54        colors[i] = disabledTextColor;
55        i++;
56
57        // Default state
58        states[i] = EMPTY_STATE_SET;
59        colors[i] = textColor;
60        i++;
61
62        return new ColorStateList(states, colors);
63    }
64
65    public static int getThemeAttrColor(Context context, int attr) {
66        TEMP_ARRAY[0] = attr;
67        TypedArray a = context.obtainStyledAttributes(null, TEMP_ARRAY);
68        try {
69            return a.getColor(0, 0);
70        } finally {
71            a.recycle();
72        }
73    }
74
75    public static ColorStateList getThemeAttrColorStateList(Context context, int attr) {
76        TEMP_ARRAY[0] = attr;
77        TypedArray a = context.obtainStyledAttributes(null, TEMP_ARRAY);
78        try {
79            return a.getColorStateList(0);
80        } finally {
81            a.recycle();
82        }
83    }
84
85    public static int getDisabledThemeAttrColor(Context context, int attr) {
86        final ColorStateList csl = getThemeAttrColorStateList(context, attr);
87        if (csl != null && csl.isStateful()) {
88            // If the CSL is stateful, we'll assume it has a disabled state and use it
89            return csl.getColorForState(DISABLED_STATE_SET, csl.getDefaultColor());
90        } else {
91            // Else, we'll generate the color using disabledAlpha from the theme
92
93            final TypedValue tv = getTypedValue();
94            // Now retrieve the disabledAlpha value from the theme
95            context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, tv, true);
96            final float disabledAlpha = tv.getFloat();
97
98            return getThemeAttrColor(context, attr, disabledAlpha);
99        }
100    }
101
102    private static TypedValue getTypedValue() {
103        TypedValue typedValue = TL_TYPED_VALUE.get();
104        if (typedValue == null) {
105            typedValue = new TypedValue();
106            TL_TYPED_VALUE.set(typedValue);
107        }
108        return typedValue;
109    }
110
111    static int getThemeAttrColor(Context context, int attr, float alpha) {
112        final int color = getThemeAttrColor(context, attr);
113        final int originalAlpha = Color.alpha(color);
114        return ColorUtils.setAlphaComponent(color, Math.round(originalAlpha * alpha));
115    }
116
117}
118