DrawStyleSpan.android.kt
/*
* Copyright 2022 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 androidx.compose.ui.text.platform.style
import android.graphics.Paint
import android.text.TextPaint
import android.text.style.CharacterStyle
import android.text.style.UpdateAppearance
import androidx.compose.ui.graphics.ShaderBrush
import androidx.compose.ui.graphics.StrokeCap
import androidx.compose.ui.graphics.StrokeJoin
import androidx.compose.ui.graphics.asAndroidPathEffect
import androidx.compose.ui.graphics.drawscope.DrawStyle
import androidx.compose.ui.graphics.drawscope.Fill
import androidx.compose.ui.graphics.drawscope.Stroke
/**
* A span that applies [ShaderBrush] to TextPaint after receiving a specified size
*/
internal class DrawStyleSpan(
val drawStyle: DrawStyle
) : CharacterStyle(), UpdateAppearance {
override fun updateDrawState(textPaint: TextPaint?) {
textPaint?.run {
when (drawStyle) {
Fill -> style = Paint.Style.FILL
is Stroke -> {
style = Paint.Style.STROKE
strokeWidth = drawStyle.width
strokeMiter = drawStyle.miter
strokeJoin = drawStyle.join.toAndroidJoin()
strokeCap = drawStyle.cap.toAndroidCap()
pathEffect = drawStyle.pathEffect?.asAndroidPathEffect()
}
}
}
}
private fun StrokeJoin.toAndroidJoin(): Paint.Join {
return when (this) {
StrokeJoin.Miter -> Paint.Join.MITER
StrokeJoin.Round -> Paint.Join.ROUND
StrokeJoin.Bevel -> Paint.Join.BEVEL
else -> Paint.Join.MITER
}
}
private fun StrokeCap.toAndroidCap(): Paint.Cap {
return when (this) {
StrokeCap.Butt -> Paint.Cap.BUTT
StrokeCap.Round -> Paint.Cap.ROUND
StrokeCap.Square -> Paint.Cap.SQUARE
else -> Paint.Cap.BUTT
}
}
}