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@ -2,42 +2,66 @@ package org.koitharu.kotatsu.ui.reader.wetoon
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import android.content.Context
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import android.graphics.PointF
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import android.graphics.RectF
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import android.util.AttributeSet
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import com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
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import org.koitharu.kotatsu.utils.ext.toIntUp
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class WebtoonImageView : SubsamplingScaleImageView {
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class WebtoonImageView @JvmOverloads constructor(context: Context, attr: AttributeSet? = null) :
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SubsamplingScaleImageView(context, attr) {
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constructor(context: Context?) : super(context)
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constructor(context: Context?, attr: AttributeSet?) : super(context, attr)
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private val pan = RectF()
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private val ct = PointF()
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fun dispatchVerticalScroll(dy: Int): Int {
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if (!isReady) {
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return 0
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private var scrollPos = 0
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private var scrollRange = SCROLL_UNKNOWN
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fun scrollBy(delta: Int) {
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val maxScroll = getScrollRange()
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if (maxScroll == 0) {
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return
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}
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val newScroll = scrollPos + delta
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scrollToInternal(newScroll.coerceIn(0, maxScroll))
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}
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fun scrollTo(y: Int) {
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val maxScroll = getScrollRange()
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if (maxScroll == 0) {
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return
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}
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scrollToInternal(y.coerceIn(0, maxScroll))
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}
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fun getScroll() = scrollPos
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fun getScrollRange(): Int {
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if (scrollRange == SCROLL_UNKNOWN) {
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computeScrollRange()
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}
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getPanRemaining(pan)
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// pan.offset(0f, -nonConsumedScroll.toFloat())
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ct.set(width / 2f, height / 2f)
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viewToSourceCoord(ct.x, ct.y, ct) ?: return 0
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val s = scale
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return when {
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dy > 0 -> {
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val delta = minOf(pan.bottom.toIntUp(), dy)
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ct.offset(0f, delta.toFloat() / s)
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setScaleAndCenter(s, ct)
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delta
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}
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dy < 0 -> {
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val delta = minOf(pan.top.toInt(), -dy)
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ct.offset(0f, -delta.toFloat() / s)
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setScaleAndCenter(s, ct)
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-delta
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}
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else -> 0
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return scrollRange.coerceAtLeast(0)
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}
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override fun recycle() {
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scrollRange = SCROLL_UNKNOWN
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scrollPos = 0
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super.recycle()
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}
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private fun scrollToInternal(pos: Int) {
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scrollPos = pos
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ct.set(sWidth / 2f, (height / 2f + pos.toFloat()) / minScale)
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setScaleAndCenter(minScale, ct)
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}
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private fun computeScrollRange() {
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if (!isReady) {
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return
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}
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val totalHeight = (sHeight * minScale).toIntUp()
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scrollRange = (totalHeight - height).coerceAtLeast(0)
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}
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private companion object {
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const val SCROLL_UNKNOWN = -1
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}
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}
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