/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License
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*/
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package com.android.systemui
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import android.animation.ArgbEvaluator
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import android.content.Context
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import android.view.ContextThemeWrapper
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import com.android.settingslib.Utils
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/**
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* A color blender for `Theme.SystemUI` and other themes.
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*
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* This class is used to handle colors from themes in [Context] in the following fashion:
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* * The theme associated has a `darkIconTheme` and a `lightIconTheme`
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* * Each of these themes define colors for the items `singleToneColor`, `backgroundColor`,
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* and `fillColor`.
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*
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* In particular, `Theme.SystemUI` is a valid [Context]. If the provided [Context] does not have
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* the correct themes, the colors that are not found will default to black.
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*
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* It provides a way to obtain these colors and blends for a given background intensity.
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*/
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class DualToneHandler(context: Context) {
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private lateinit var darkColor: Color
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private lateinit var lightColor: Color
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init {
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setColorsFromContext(context)
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}
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/**
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* Sets the colors in this object from the given [Context]
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*
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* @param[context] A context with the appropriate themes to extract the colors from.
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*/
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fun setColorsFromContext(context: Context) {
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val dualToneDarkTheme = ContextThemeWrapper(context,
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Utils.getThemeAttr(context, R.attr.darkIconTheme))
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val dualToneLightTheme = ContextThemeWrapper(context,
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Utils.getThemeAttr(context, R.attr.lightIconTheme))
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darkColor = Color(
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Utils.getColorAttrDefaultColor(dualToneDarkTheme, R.attr.singleToneColor),
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Utils.getColorAttrDefaultColor(dualToneDarkTheme, R.attr.backgroundColor),
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Utils.getColorAttrDefaultColor(dualToneDarkTheme, R.attr.fillColor))
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lightColor = Color(
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Utils.getColorAttrDefaultColor(dualToneLightTheme, R.attr.singleToneColor),
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Utils.getColorAttrDefaultColor(dualToneLightTheme, R.attr.backgroundColor),
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Utils.getColorAttrDefaultColor(dualToneLightTheme, R.attr.fillColor))
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}
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private fun getColorForDarkIntensity(darkIntensity: Float, lightColor: Int, darkColor: Int) =
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ArgbEvaluator.getInstance().evaluate(darkIntensity, lightColor, darkColor) as Int
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/**
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* Blends the single color associated with the light and dark theme
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*
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* @param[intensity] Intensity of the background. Correspond with the "percentage" of color
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* from `darkIconTheme` to use
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* @return The blended color
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*/
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fun getSingleColor(intensity: Float) =
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getColorForDarkIntensity(intensity, lightColor.single, darkColor.single)
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/**
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* Blends the background color associated with the light and dark theme
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*
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* @param[intensity] Intensity of the background. Correspond with the "percentage" of color
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* from `darkIconTheme` to use
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* @return The blended color
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*/
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fun getBackgroundColor(intensity: Float) =
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getColorForDarkIntensity(intensity, lightColor.background, darkColor.background)
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/**
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* Blends the fill color associated with the light and dark theme
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*
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* @param[intensity] Intensity of the background. Correspond with the "percentage" of color
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* from `darkIconTheme` to use
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* @return The blended color
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*/
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fun getFillColor(intensity: Float) =
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getColorForDarkIntensity(intensity, lightColor.fill, darkColor.fill)
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private data class Color(val single: Int, val background: Int, val fill: Int)
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}
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