1 /*
2  * Copyright (C) 2019 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.systemui
18 
19 import android.animation.ArgbEvaluator
20 import android.content.Context
21 import android.view.ContextThemeWrapper
22 import com.android.settingslib.Utils
23 
24 /**
25  * A color blender for `Theme.SystemUI` and other themes.
26  *
27  * This class is used to handle colors from themes in [Context] in the following fashion:
28  * * The theme associated has a `darkIconTheme` and a `lightIconTheme`
29  * * Each of these themes define colors for the items `singleToneColor`, `backgroundColor`,
30  * and `fillColor`.
31  *
32  * In particular, `Theme.SystemUI` is a valid [Context]. If the provided [Context] does not have
33  * the correct themes, the colors that are not found will default to black.
34  *
35  * It provides a way to obtain these colors and blends for a given background intensity.
36  */
37 class DualToneHandler(context: Context) {
38     private lateinit var darkColor: Color
39     private lateinit var lightColor: Color
40 
41     init {
42         setColorsFromContext(context)
43     }
44 
45     /**
46      * Sets the colors in this object from the given [Context]
47      *
48      * @param[context] A context with the appropriate themes to extract the colors from.
49      */
setColorsFromContextnull50     fun setColorsFromContext(context: Context) {
51         val dualToneDarkTheme = ContextThemeWrapper(context,
52                 Utils.getThemeAttr(context, R.attr.darkIconTheme))
53         val dualToneLightTheme = ContextThemeWrapper(context,
54                 Utils.getThemeAttr(context, R.attr.lightIconTheme))
55         darkColor = Color(
56                 Utils.getColorAttrDefaultColor(dualToneDarkTheme, R.attr.singleToneColor),
57                 Utils.getColorAttrDefaultColor(dualToneDarkTheme, R.attr.backgroundColor),
58                 Utils.getColorAttrDefaultColor(dualToneDarkTheme, R.attr.fillColor))
59         lightColor = Color(
60                 Utils.getColorAttrDefaultColor(dualToneLightTheme, R.attr.singleToneColor),
61                 Utils.getColorAttrDefaultColor(dualToneLightTheme, R.attr.backgroundColor),
62                 Utils.getColorAttrDefaultColor(dualToneLightTheme, R.attr.fillColor))
63     }
64 
getColorForDarkIntensitynull65     private fun getColorForDarkIntensity(darkIntensity: Float, lightColor: Int, darkColor: Int) =
66         ArgbEvaluator.getInstance().evaluate(darkIntensity, lightColor, darkColor) as Int
67 
68     /**
69      * Blends the single color associated with the light and dark theme
70      *
71      * @param[intensity] Intensity of the background. Correspond with the "percentage" of color
72      * from `darkIconTheme` to use
73      * @return The blended color
74      */
75     fun getSingleColor(intensity: Float) =
76             getColorForDarkIntensity(intensity, lightColor.single, darkColor.single)
77 
78     /**
79      * Blends the background color associated with the light and dark theme
80      *
81      * @param[intensity] Intensity of the background. Correspond with the "percentage" of color
82      * from `darkIconTheme` to use
83      * @return The blended color
84      */
85     fun getBackgroundColor(intensity: Float) =
86             getColorForDarkIntensity(intensity, lightColor.background, darkColor.background)
87 
88     /**
89      * Blends the fill color associated with the light and dark theme
90      *
91      * @param[intensity] Intensity of the background. Correspond with the "percentage" of color
92      * from `darkIconTheme` to use
93      * @return The blended color
94      */
95     fun getFillColor(intensity: Float) =
96             getColorForDarkIntensity(intensity, lightColor.fill, darkColor.fill)
97 
98     private data class Color(val single: Int, val background: Int, val fill: Int)
99 }