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 androidx.appcompat.widget;
18 
19 import android.content.Context;
20 import android.content.res.ColorStateList;
21 import android.graphics.Color;
22 import android.util.TypedValue;
23 
24 import androidx.core.graphics.ColorUtils;
25 
26 class ThemeUtils {
27 
28     private static final ThreadLocal<TypedValue> TL_TYPED_VALUE = new ThreadLocal<>();
29 
30     static final int[] DISABLED_STATE_SET = new int[]{-android.R.attr.state_enabled};
31     static final int[] FOCUSED_STATE_SET = new int[]{android.R.attr.state_focused};
32     static final int[] ACTIVATED_STATE_SET = new int[]{android.R.attr.state_activated};
33     static final int[] PRESSED_STATE_SET = new int[]{android.R.attr.state_pressed};
34     static final int[] CHECKED_STATE_SET = new int[]{android.R.attr.state_checked};
35     static final int[] SELECTED_STATE_SET = new int[]{android.R.attr.state_selected};
36     static final int[] NOT_PRESSED_OR_FOCUSED_STATE_SET = new int[]{
37             -android.R.attr.state_pressed, -android.R.attr.state_focused};
38     static final int[] EMPTY_STATE_SET = new int[0];
39 
40     private static final int[] TEMP_ARRAY = new int[1];
41 
createDisabledStateList(int textColor, int disabledTextColor)42     public static ColorStateList createDisabledStateList(int textColor, int disabledTextColor) {
43         // Now create a new ColorStateList with the default color, and the new disabled
44         // color
45         final int[][] states = new int[2][];
46         final int[] colors = new int[2];
47         int i = 0;
48 
49         // Disabled state
50         states[i] = DISABLED_STATE_SET;
51         colors[i] = disabledTextColor;
52         i++;
53 
54         // Default state
55         states[i] = EMPTY_STATE_SET;
56         colors[i] = textColor;
57         i++;
58 
59         return new ColorStateList(states, colors);
60     }
61 
getThemeAttrColor(Context context, int attr)62     public static int getThemeAttrColor(Context context, int attr) {
63         TEMP_ARRAY[0] = attr;
64         TintTypedArray a = TintTypedArray.obtainStyledAttributes(context, null, TEMP_ARRAY);
65         try {
66             return a.getColor(0, 0);
67         } finally {
68             a.recycle();
69         }
70     }
71 
getThemeAttrColorStateList(Context context, int attr)72     public static ColorStateList getThemeAttrColorStateList(Context context, int attr) {
73         TEMP_ARRAY[0] = attr;
74         TintTypedArray a = TintTypedArray.obtainStyledAttributes(context, null, TEMP_ARRAY);
75         try {
76             return a.getColorStateList(0);
77         } finally {
78             a.recycle();
79         }
80     }
81 
getDisabledThemeAttrColor(Context context, int attr)82     public static int getDisabledThemeAttrColor(Context context, int attr) {
83         final ColorStateList csl = getThemeAttrColorStateList(context, attr);
84         if (csl != null && csl.isStateful()) {
85             // If the CSL is stateful, we'll assume it has a disabled state and use it
86             return csl.getColorForState(DISABLED_STATE_SET, csl.getDefaultColor());
87         } else {
88             // Else, we'll generate the color using disabledAlpha from the theme
89 
90             final TypedValue tv = getTypedValue();
91             // Now retrieve the disabledAlpha value from the theme
92             context.getTheme().resolveAttribute(android.R.attr.disabledAlpha, tv, true);
93             final float disabledAlpha = tv.getFloat();
94 
95             return getThemeAttrColor(context, attr, disabledAlpha);
96         }
97     }
98 
getTypedValue()99     private static TypedValue getTypedValue() {
100         TypedValue typedValue = TL_TYPED_VALUE.get();
101         if (typedValue == null) {
102             typedValue = new TypedValue();
103             TL_TYPED_VALUE.set(typedValue);
104         }
105         return typedValue;
106     }
107 
getThemeAttrColor(Context context, int attr, float alpha)108     static int getThemeAttrColor(Context context, int attr, float alpha) {
109         final int color = getThemeAttrColor(context, attr);
110         final int originalAlpha = Color.alpha(color);
111         return ColorUtils.setAlphaComponent(color, Math.round(originalAlpha * alpha));
112     }
113 
ThemeUtils()114     private ThemeUtils() {
115     }
116 }
117