69 lines
1.6 KiB
Kotlin
69 lines
1.6 KiB
Kotlin
package jp.juggler.subwaytooter.span
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import android.graphics.Paint
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import android.graphics.Typeface
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import android.text.TextPaint
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import android.text.style.MetricAffectingSpan
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import java.lang.ref.WeakReference
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import kotlin.math.sin
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class MisskeyBigSpan (
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private val typeface : Typeface
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): MetricAffectingSpan() ,AnimatableSpan{
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private var invalidate_callback : AnimatableSpanInvalidator? = null
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private var refDrawTarget : WeakReference<Any>? = null
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override fun setInvalidateCallback(
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draw_target_tag : Any,
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invalidate_callback : AnimatableSpanInvalidator
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) {
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this.refDrawTarget = WeakReference(draw_target_tag)
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this.invalidate_callback = invalidate_callback
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}
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private val textScalingMax = 1.5f
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override fun updateMeasureState(paint : TextPaint) {
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apply(paint,bDrawing=false)
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}
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override fun updateDrawState(drawState : TextPaint) {
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apply(drawState,bDrawing=true)
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}
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private fun apply(paint : Paint, bDrawing:Boolean ) {
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val textScaling = when{
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!bDrawing -> textScalingMax
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else -> {
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invalidate_callback?.delayInvalidate(100L)
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val t = (invalidate_callback?.timeFromStart ?: 0L) /500f
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textScalingMax * ( sin(t.toDouble()).toFloat() * 0.1f + 0.9f)
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}
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}
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paint.textSize = paint.textSize * textScaling
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val oldTypeface = paint.typeface
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val oldStyle = oldTypeface?.style ?: 0
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val fakeStyle = oldStyle and typeface.style.inv()
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if(fakeStyle and Typeface.BOLD != 0) {
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paint.isFakeBoldText = true
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}
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if(fakeStyle and Typeface.ITALIC != 0) {
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paint.textSkewX = - 0.25f
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}
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paint.typeface = typeface
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}
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}
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