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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.systemui.util
import android.content.pm.ActivityInfo
import android.content.res.Resources
import android.graphics.Rect
import android.graphics.drawable.Drawable
import android.graphics.drawable.DrawableWrapper
import android.graphics.drawable.InsetDrawable
/**
* [DrawableWrapper] to use in the progress of brightness slider.
*
* This drawable is used to change the bounds of the enclosed drawable depending on the level to
* simulate a sliding progress, instead of using clipping or scaling. That way, the shape of the
* edges is maintained.
*
* Meant to be used with a rounded ends background, it will also prevent deformation when the slider
* is meant to be smaller than the rounded corner. The background should have rounded corners that
* are half of the height.
*
* This class also assumes that a "thumb" icon exists within the end's edge of the progress
* drawable, and the slider's width, when interacted on, if offset by half the size of the thumb
* icon which puts the icon directly underneath the user's finger.
*/
class BrightnessProgressDrawable @JvmOverloads constructor(drawable: Drawable? = null) :
InsetDrawable(drawable, 0) {
companion object {
private const val MAX_LEVEL = 10000 // Taken from Drawable
}
override fun onLayoutDirectionChanged(layoutDirection: Int): Boolean {
onLevelChange(level)
return super.onLayoutDirectionChanged(layoutDirection)
}
override fun onBoundsChange(bounds: Rect) {
super.onBoundsChange(bounds)
onLevelChange(level)
}
override fun onLevelChange(level: Int): Boolean {
val db = drawable?.bounds!!
// The thumb offset shifts the sun icon directly under the user's thumb
val thumbOffset = bounds.height() / 2
val width = bounds.width() * level / MAX_LEVEL + thumbOffset
// On 0, the width is bounds.height (a circle), and on MAX_LEVEL, the width is bounds.width
drawable?.setBounds(
bounds.left,
db.top,
width.coerceAtMost(bounds.width()).coerceAtLeast(bounds.height()),
db.bottom
)
return super.onLevelChange(level)
}
override fun getConstantState(): ConstantState {
// This should not be null as it was created with a state in the constructor.
return RoundedCornerState(super.getConstantState()!!)
}
override fun getChangingConfigurations(): Int {
return super.getChangingConfigurations() or ActivityInfo.CONFIG_DENSITY
}
override fun canApplyTheme(): Boolean {
return (drawable?.canApplyTheme() ?: false) || super.canApplyTheme()
}
private class RoundedCornerState(private val wrappedState: ConstantState) : ConstantState() {
override fun newDrawable(): Drawable {
return newDrawable(null, null)
}
override fun newDrawable(res: Resources?, theme: Resources.Theme?): Drawable {
val wrapper = wrappedState.newDrawable(res, theme) as DrawableWrapper
return BrightnessProgressDrawable(wrapper.drawable)
}
override fun getChangingConfigurations(): Int {
return wrappedState.changingConfigurations
}
override fun canApplyTheme(): Boolean {
return true
}
}
}
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