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.widget;
18
19import android.content.Context;
20import android.content.res.ColorStateList;
21import android.graphics.Color;
22import android.support.v4.graphics.ColorUtils;
23import android.util.TypedValue;
24
25class ThemeUtils {
26
27    private static final ThreadLocal<TypedValue> TL_TYPED_VALUE = new ThreadLocal<>();
28
29    static final int[] DISABLED_STATE_SET = new int[]{-android.R.attr.state_enabled};
30    static final int[] FOCUSED_STATE_SET = new int[]{android.R.attr.state_focused};
31    static final int[] ACTIVATED_STATE_SET = new int[]{android.R.attr.state_activated};
32    static final int[] PRESSED_STATE_SET = new int[]{android.R.attr.state_pressed};
33    static final int[] CHECKED_STATE_SET = new int[]{android.R.attr.state_checked};
34    static final int[] SELECTED_STATE_SET = new int[]{android.R.attr.state_selected};
35    static final int[] NOT_PRESSED_OR_FOCUSED_STATE_SET = new int[]{
36            -android.R.attr.state_pressed, -android.R.attr.state_focused};
37    static final int[] EMPTY_STATE_SET = new int[0];
38
39    private static final int[] TEMP_ARRAY = new int[1];
40
41    public static ColorStateList createDisabledStateList(int textColor, int disabledTextColor) {
42        // Now create a new ColorStateList with the default color, and the new disabled
43        // color
44        final int[][] states = new int[2][];
45        final int[] colors = new int[2];
46        int i = 0;
47
48        // Disabled state
49        states[i] = DISABLED_STATE_SET;
50        colors[i] = disabledTextColor;
51        i++;
52
53        // Default state
54        states[i] = EMPTY_STATE_SET;
55        colors[i] = textColor;
56        i++;
57
58        return new ColorStateList(states, colors);
59    }
60
61    public static int getThemeAttrColor(Context context, int attr) {
62        TEMP_ARRAY[0] = attr;
63        TintTypedArray a = TintTypedArray.obtainStyledAttributes(context, null, TEMP_ARRAY);
64        try {
65            return a.getColor(0, 0);
66        } finally {
67            a.recycle();
68        }
69    }
70
71    public static ColorStateList getThemeAttrColorStateList(Context context, int attr) {
72        TEMP_ARRAY[0] = attr;
73        TintTypedArray a = TintTypedArray.obtainStyledAttributes(context, null, TEMP_ARRAY);
74        try {
75            return a.getColorStateList(0);
76        } finally {
77            a.recycle();
78        }
79    }
80
81    public static int getDisabledThemeAttrColor(Context context, int attr) {
82        final ColorStateList csl = getThemeAttrColorStateList(context, attr);
83        if (csl != null && csl.isStateful()) {
84            // If the CSL is stateful, we'll assume it has a disabled state and use it
85            return csl.getColorForState(DISABLED_STATE_SET, csl.getDefaultColor());
86        } else {
87            // Else, we'll generate the color using disabledAlpha from the theme
88
89            final TypedValue tv = getTypedValue();
90            // Now retrieve the disabledAlpha value from the theme
91            context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, tv, true);
92            final float disabledAlpha = tv.getFloat();
93
94            return getThemeAttrColor(context, attr, disabledAlpha);
95        }
96    }
97
98    private static TypedValue getTypedValue() {
99        TypedValue typedValue = TL_TYPED_VALUE.get();
100        if (typedValue == null) {
101            typedValue = new TypedValue();
102            TL_TYPED_VALUE.set(typedValue);
103        }
104        return typedValue;
105    }
106
107    static int getThemeAttrColor(Context context, int attr, float alpha) {
108        final int color = getThemeAttrColor(context, attr);
109        final int originalAlpha = Color.alpha(color);
110        return ColorUtils.setAlphaComponent(color, Math.round(originalAlpha * alpha));
111    }
112
113}
114