1 /*
2  * Copyright (C) 2017 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 com.android.launcher3.util;
18 
19 import static android.app.WallpaperColors.HINT_SUPPORTS_DARK_TEXT;
20 import static android.app.WallpaperColors.HINT_SUPPORTS_DARK_THEME;
21 
22 import static com.android.launcher3.LauncherPrefs.THEMED_ICONS;
23 
24 import android.content.Context;
25 import android.content.res.TypedArray;
26 import android.graphics.Color;
27 import android.graphics.ColorMatrix;
28 import android.graphics.drawable.Drawable;
29 import android.util.AttributeSet;
30 import android.util.SparseArray;
31 import android.util.TypedValue;
32 
33 import androidx.annotation.ColorInt;
34 
35 import com.android.launcher3.LauncherPrefs;
36 import com.android.launcher3.R;
37 import com.android.launcher3.Utilities;
38 import com.android.launcher3.icons.GraphicsUtils;
39 import com.android.launcher3.views.ActivityContext;
40 
41 /**
42  * Various utility methods associated with theming.
43  */
44 @SuppressWarnings("NewApi")
45 public class Themes {
46 
47     public static final String KEY_THEMED_ICONS = "themed_icons";
48 
49     /** Gets the WallpaperColorHints and then uses those to get the correct activity theme res. */
getActivityThemeRes(Context context)50     public static int getActivityThemeRes(Context context) {
51         return getActivityThemeRes(context, WallpaperColorHints.get(context).getHints());
52     }
53 
getActivityThemeRes(Context context, int wallpaperColorHints)54     public static int getActivityThemeRes(Context context, int wallpaperColorHints) {
55         boolean supportsDarkText = Utilities.ATLEAST_S
56                 && (wallpaperColorHints & HINT_SUPPORTS_DARK_TEXT) != 0;
57         boolean isMainColorDark = Utilities.ATLEAST_S
58                 && (wallpaperColorHints & HINT_SUPPORTS_DARK_THEME) != 0;
59 
60         if (Utilities.isDarkTheme(context)) {
61             return supportsDarkText ? R.style.AppTheme_Dark_DarkText
62                     : isMainColorDark ? R.style.AppTheme_Dark_DarkMainColor : R.style.AppTheme_Dark;
63         } else {
64             return supportsDarkText ? R.style.AppTheme_DarkText
65                     : isMainColorDark ? R.style.AppTheme_DarkMainColor : R.style.AppTheme;
66         }
67     }
68 
69     /**
70      * Returns true if workspace icon theming is enabled
71      */
isThemedIconEnabled(Context context)72     public static boolean isThemedIconEnabled(Context context) {
73         return LauncherPrefs.get(context).get(THEMED_ICONS);
74     }
75 
getDefaultBodyFont(Context context)76     public static String getDefaultBodyFont(Context context) {
77         TypedArray ta = context.obtainStyledAttributes(android.R.style.TextAppearance_DeviceDefault,
78                 new int[]{android.R.attr.fontFamily});
79         String value = ta.getString(0);
80         ta.recycle();
81         return value;
82     }
83 
getDialogCornerRadius(Context context)84     public static float getDialogCornerRadius(Context context) {
85         return getDimension(context, android.R.attr.dialogCornerRadius,
86                 context.getResources().getDimension(R.dimen.default_dialog_corner_radius));
87     }
88 
getDimension(Context context, int attr, float defaultValue)89     public static float getDimension(Context context, int attr, float defaultValue) {
90         TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
91         float value = ta.getDimension(0, defaultValue);
92         ta.recycle();
93         return value;
94     }
95 
getColorAccent(Context context)96     public static int getColorAccent(Context context) {
97         return getAttrColor(context, android.R.attr.colorAccent);
98     }
99 
100     /** Returns the background color attribute. */
getColorBackground(Context context)101     public static int getColorBackground(Context context) {
102         return getAttrColor(context, android.R.attr.colorBackground);
103     }
104 
105     /** Returns the floating background color attribute. */
getColorBackgroundFloating(Context context)106     public static int getColorBackgroundFloating(Context context) {
107         return getAttrColor(context, android.R.attr.colorBackgroundFloating);
108     }
109 
getAttrColor(Context context, int attr)110     public static int getAttrColor(Context context, int attr) {
111         return GraphicsUtils.getAttrColor(context, attr);
112     }
113 
getAttrBoolean(Context context, int attr)114     public static boolean getAttrBoolean(Context context, int attr) {
115         TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
116         boolean value = ta.getBoolean(0, false);
117         ta.recycle();
118         return value;
119     }
120 
getAttrDrawable(Context context, int attr)121     public static Drawable getAttrDrawable(Context context, int attr) {
122         TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
123         Drawable value = ta.getDrawable(0);
124         ta.recycle();
125         return value;
126     }
127 
getAttrInteger(Context context, int attr)128     public static int getAttrInteger(Context context, int attr) {
129         TypedArray ta = context.obtainStyledAttributes(new int[]{attr});
130         int value = ta.getInteger(0, 0);
131         ta.recycle();
132         return value;
133     }
134 
135     /**
136      * Scales a color matrix such that, when applied to color R G B A, it produces R' G' B' A' where
137      * R' = r * R
138      * G' = g * G
139      * B' = b * B
140      * A' = a * A
141      *
142      * The matrix will, for instance, turn white into r g b a, and black will remain black.
143      *
144      * @param color The color r g b a
145      * @param target The ColorMatrix to scale
146      */
setColorScaleOnMatrix(int color, ColorMatrix target)147     public static void setColorScaleOnMatrix(int color, ColorMatrix target) {
148         target.setScale(Color.red(color) / 255f, Color.green(color) / 255f,
149                 Color.blue(color) / 255f, Color.alpha(color) / 255f);
150     }
151 
152     /**
153      * Changes a color matrix such that, when applied to srcColor, it produces dstColor.
154      *
155      * Note that values on the last column of target ColorMatrix can be negative, and may result in
156      * negative values when applied on a color. Such negative values will be automatically shifted
157      * up to 0 by the framework.
158      *
159      * @param srcColor The color to start from
160      * @param dstColor The color to create by applying target on srcColor
161      * @param target The ColorMatrix to transform the color
162      */
setColorChangeOnMatrix(int srcColor, int dstColor, ColorMatrix target)163     public static void setColorChangeOnMatrix(int srcColor, int dstColor, ColorMatrix target) {
164         target.reset();
165         target.getArray()[4] = Color.red(dstColor) - Color.red(srcColor);
166         target.getArray()[9] = Color.green(dstColor) - Color.green(srcColor);
167         target.getArray()[14] = Color.blue(dstColor) - Color.blue(srcColor);
168         target.getArray()[19] = Color.alpha(dstColor) - Color.alpha(srcColor);
169     }
170 
171     /**
172      * Creates a map for attribute-name to value for all the values in {@param attrs} which can be
173      * held in memory for later use.
174      */
createValueMap(Context context, AttributeSet attrSet, IntArray keysToIgnore)175     public static SparseArray<TypedValue> createValueMap(Context context, AttributeSet attrSet,
176             IntArray keysToIgnore) {
177         int count = attrSet.getAttributeCount();
178         IntArray attrNameArray = new IntArray(count);
179         for (int i = 0; i < count; i++) {
180             attrNameArray.add(attrSet.getAttributeNameResource(i));
181         }
182         attrNameArray.removeAllValues(keysToIgnore);
183 
184         int[] attrNames = attrNameArray.toArray();
185         SparseArray<TypedValue> result = new SparseArray<>(attrNames.length);
186         TypedArray ta = context.obtainStyledAttributes(attrSet, attrNames);
187         for (int i = 0; i < attrNames.length; i++) {
188             TypedValue tv = new TypedValue();
189             ta.getValue(i, tv);
190             result.put(attrNames[i], tv);
191         }
192 
193         return result;
194     }
195 
196     /** Returns the desired navigation bar scrim color depending on the {@code DeviceProfile}. */
197     @ColorInt
getNavBarScrimColor(T context)198     public static <T extends Context & ActivityContext> int getNavBarScrimColor(T context) {
199         return context.getDeviceProfile().isTaskbarPresent
200                 ? context.getColor(R.color.taskbar_background)
201                 : Themes.getAttrColor(context, R.attr.allAppsNavBarScrimColor);
202     }
203 }
204