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/*
* Copyright © 2018 The Android Open Source Project
* Copyright © 2018-2019 WireGuard LLC. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0
*/
package com.wireguard.android.widget
import android.animation.ObjectAnimator
import android.content.res.ColorStateList
import android.graphics.*
import android.graphics.drawable.Drawable
import android.os.Build
import android.util.FloatProperty
import androidx.annotation.ColorInt
import androidx.annotation.IntRange
import androidx.annotation.RequiresApi
@RequiresApi(Build.VERSION_CODES.N)
class SlashDrawable(private val mDrawable: Drawable) : Drawable() {
private val mPaint = Paint(Paint.ANTI_ALIAS_FLAG)
private val mPath = Path()
private val mSlashRect = RectF()
private var mAnimationEnabled = true
// Animate this value on change
private var mCurrentSlashLength = 0f
private var mRotation = 0f
private var mSlashed = false
override fun draw(canvas: Canvas) {
canvas.save()
val m = Matrix()
val width = bounds.width()
val height = bounds.height()
val radiusX = scale(CORNER_RADIUS, width)
val radiusY = scale(CORNER_RADIUS, height)
updateRect(
scale(LEFT, width),
scale(TOP, height),
scale(RIGHT, width),
scale(TOP + mCurrentSlashLength, height)
)
mPath.reset()
// Draw the slash vertically
mPath.addRoundRect(mSlashRect, radiusX, radiusY, Path.Direction.CW)
// Rotate -45 + desired rotation
m.setRotate(mRotation + DEFAULT_ROTATION, width / 2f, height / 2f)
mPath.transform(m)
canvas.drawPath(mPath, mPaint)
// Rotate back to vertical
m.setRotate(-mRotation - DEFAULT_ROTATION, width / 2f, height / 2f)
mPath.transform(m)
// Draw another rect right next to the first, for clipping
m.setTranslate(mSlashRect.width(), 0f)
mPath.transform(m)
mPath.addRoundRect(mSlashRect, 1f * width, 1f * height, Path.Direction.CW)
m.setRotate(mRotation + DEFAULT_ROTATION, width / 2f, height / 2f)
mPath.transform(m)
@Suppress("DEPRECATION")
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
canvas.clipPath(mPath, Region.Op.DIFFERENCE) else canvas.clipOutPath(mPath)
mDrawable.draw(canvas)
canvas.restore()
}
override fun getIntrinsicHeight() = mDrawable.intrinsicHeight
override fun getIntrinsicWidth() = mDrawable.intrinsicWidth
override fun getOpacity() = PixelFormat.OPAQUE
override fun onBoundsChange(bounds: Rect) {
super.onBoundsChange(bounds)
mDrawable.bounds = bounds
}
private fun scale(frac: Float, width: Int) = frac * width
override fun setAlpha(@IntRange(from = 0, to = 255) alpha: Int) {
mDrawable.alpha = alpha
mPaint.alpha = alpha
}
fun setAnimationEnabled(enabled: Boolean) {
mAnimationEnabled = enabled
}
override fun setColorFilter(colorFilter: ColorFilter?) {
mDrawable.colorFilter = colorFilter
mPaint.colorFilter = colorFilter
}
private fun setDrawableTintList(tint: ColorStateList?) {
mDrawable.setTintList(tint)
}
fun setRotation(rotation: Float) {
if (mRotation == rotation) return
mRotation = rotation
invalidateSelf()
}
fun setSlashed(slashed: Boolean) {
if (mSlashed == slashed) return
mSlashed = slashed
val end = if (mSlashed) SLASH_HEIGHT / SCALE else 0f
val start = if (mSlashed) 0f else SLASH_HEIGHT / SCALE
if (mAnimationEnabled) {
val anim = ObjectAnimator.ofFloat(this, mSlashLengthProp, start, end)
anim.addUpdateListener { _ -> invalidateSelf() }
anim.duration = QS_ANIM_LENGTH
anim.start()
} else {
mCurrentSlashLength = end
invalidateSelf()
}
}
override fun setTint(@ColorInt tintColor: Int) {
super.setTint(tintColor)
mDrawable.setTint(tintColor)
mPaint.color = tintColor
}
override fun setTintList(tint: ColorStateList?) {
super.setTintList(tint)
setDrawableTintList(tint)
mPaint.color = tint?.defaultColor ?: 0
invalidateSelf()
}
override fun setTintMode(tintMode: PorterDuff.Mode?) {
super.setTintMode(tintMode)
mDrawable.setTintMode(tintMode)
}
private fun updateRect(left: Float, top: Float, right: Float, bottom: Float) {
mSlashRect.left = left
mSlashRect.top = top
mSlashRect.right = right
mSlashRect.bottom = bottom
}
companion object {
private const val CENTER_X = 10.65f
private const val CENTER_Y = 11.869239f
private val CORNER_RADIUS = if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) 0f else 1f
// Draw the slash washington-monument style; rotate to no-u-turn style
private const val DEFAULT_ROTATION = -45f
private const val QS_ANIM_LENGTH: Long = 350
private const val SCALE = 24f
private const val SLASH_HEIGHT = 28f
// These values are derived in un-rotated (vertical) orientation
private const val SLASH_WIDTH = 1.8384776f
// Bottom is derived during animation
private const val LEFT = (CENTER_X - SLASH_WIDTH / 2) / SCALE
private const val RIGHT = (CENTER_X + SLASH_WIDTH / 2) / SCALE
private const val TOP = (CENTER_Y - SLASH_HEIGHT / 2) / SCALE
private val mSlashLengthProp: FloatProperty<SlashDrawable> = object : FloatProperty<SlashDrawable>("slashLength") {
override fun get(obj: SlashDrawable): Float {
return obj.mCurrentSlashLength
}
override fun setValue(obj: SlashDrawable, value: Float) {
obj.mCurrentSlashLength = value
}
}
}
}
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