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 
17 package android.support.v7.internal.widget;
18 
19 import android.content.Context;
20 import android.content.res.ColorStateList;
21 import android.content.res.TypedArray;
22 import android.graphics.Color;
23 import android.support.v4.graphics.ColorUtils;
24 import android.util.TypedValue;
25 
26 /**
27  * @hide
28  */
29 public 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 
createDisabledStateList(int textColor, int disabledTextColor)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 
getThemeAttrColor(Context context, int attr)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 
getThemeAttrColorStateList(Context context, int attr)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 
getDisabledThemeAttrColor(Context context, int attr)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 
getTypedValue()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 
getThemeAttrColor(Context context, int attr, float alpha)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