75 lines
2.1 KiB
Kotlin
75 lines
2.1 KiB
Kotlin
package net.shadowfacts.phycon.client.screen
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import net.minecraft.util.Identifier
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import net.minecraft.util.math.MathHelper
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import net.shadowfacts.cacao.geometry.Point
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import net.shadowfacts.cacao.geometry.Rect
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import net.shadowfacts.cacao.util.MouseButton
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import net.shadowfacts.cacao.util.texture.Texture
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import net.shadowfacts.cacao.view.TextureView
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import net.shadowfacts.cacao.view.View
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import net.shadowfacts.phycon.PhysicalConnectivity
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/**
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* @author shadowfacts
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*/
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class ScrollTrackView(
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val scrollPositionChanged: (ScrollTrackView) -> Unit,
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): View() {
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companion object {
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private val THUMB = Texture(Identifier(PhysicalConnectivity.MODID, "textures/gui/terminal.png"), 52, 230)
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private const val THUMB_WIDTH = 12.0
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private const val THUMB_HEIGHT = 15.0
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}
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private lateinit var thumbView: TextureView
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private var grabbedY: Double? = null
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/**
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* The [0,1] normalized position of the scroll thumb.
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*/
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var scrollPosition: Double
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get() = thumbView.frame.top / (frame.height - THUMB_HEIGHT)
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set(value) {
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val newTop = MathHelper.clamp(value, 0.0, 1.0) * (frame.height - THUMB_HEIGHT)
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thumbView.frame = Rect(0.0, newTop, THUMB_WIDTH, THUMB_HEIGHT)
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}
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init {
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respondsToDragging = true
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}
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override fun wasAdded() {
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super.wasAdded()
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thumbView = addSubview(TextureView(THUMB).apply {
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usesConstraintBasedLayout = false
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frame = Rect(0.0, 0.0, THUMB_WIDTH, THUMB_HEIGHT)
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})
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}
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override fun mouseDragged(startPoint: Point, delta: Point, mouseButton: MouseButton): Boolean {
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if (grabbedY == null && startPoint !in thumbView.frame) {
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val newCenter = MathHelper.clamp(startPoint.y, THUMB_HEIGHT / 2, frame.height - THUMB_HEIGHT / 2)
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thumbView.frame = Rect(0.0, newCenter - THUMB_HEIGHT / 2, THUMB_WIDTH, THUMB_HEIGHT)
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}
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if (grabbedY == null) {
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grabbedY = startPoint.y - thumbView.frame.top
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}
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val newTop = MathHelper.clamp(startPoint.y - grabbedY!!, 0.0, frame.height - THUMB_HEIGHT)
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thumbView.frame = Rect(0.0, newTop, THUMB_WIDTH, THUMB_HEIGHT)
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scrollPositionChanged(this)
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return true
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}
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override fun mouseDragEnded(point: Point, mouseButton: MouseButton) {
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grabbedY = null
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}
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}
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