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      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      */
     50     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 
     65     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 }