64 lines
1.8 KiB
Kotlin
64 lines
1.8 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 MisskeyMotionSpan(
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private val typeface: Typeface,
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) : MetricAffectingSpan(), AnimatableSpan {
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private var invalidateCallback: AnimatableSpanInvalidator? = null
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private var refDrawTarget: WeakReference<Any>? = null
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override fun setInvalidateCallback(
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drawTargetTag: Any,
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invalidateCallback: AnimatableSpanInvalidator,
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) {
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this.refDrawTarget = WeakReference(drawTargetTag)
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this.invalidateCallback = invalidateCallback
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}
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private val textScalingMax = 1.0f
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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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invalidateCallback?.delayInvalidate(100L)
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val t = (invalidateCallback?.timeFromStart ?: 0L) / 100f
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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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