Gui window skrilling

Author: bladekt

common/src/main/kotlin/com/lambda/gui/api/GuiEvent.kt

@@ -4,6 +4,7 @@ import com.lambda.event.Event
 import com.lambda.util.KeyCode
 import com.lambda.util.Mouse
 import com.lambda.util.math.Vec2d
+import net.minecraft.world.gen.feature.DeltaFeature
 
 abstract class GuiEvent : Event {
     class Show : GuiEvent()
@@ -14,4 +15,5 @@ abstract class GuiEvent : Event {
     class CharTyped(val char: Char) : GuiEvent()
     class MouseClick(val button: Mouse.Button, val action: Mouse.Action, val mouse: Vec2d) : GuiEvent()
     class MouseMove(val mouse: Vec2d) : GuiEvent()
+    class MouseScroll(val mouse: Vec2d, val delta: Double) : GuiEvent()
 }

common/src/main/kotlin/com/lambda/gui/api/LambdaGui.kt

@@ -131,6 +131,16 @@ abstract class LambdaGui(
         onEvent(GuiEvent.MouseMove(rescaleMouse(mouseX, mouseY)))
     }
 
+    override fun mouseScrolled(
+        mouseX: Double,
+        mouseY: Double,
+        horizontalAmount: Double,
+        verticalAmount: Double
+    ): Boolean {
+        onEvent(GuiEvent.MouseScroll(rescaleMouse(mouseX, mouseY), verticalAmount))
+        return true
+    }
+
     final override fun shouldPause() = false
 
     private fun rescaleMouse(mouseX: Double, mouseY: Double): Vec2d {

common/src/main/kotlin/com/lambda/gui/api/component/ListWindow.kt

@@ -3,16 +3,39 @@ package com.lambda.gui.api.component
 import com.lambda.gui.api.GuiEvent
 import com.lambda.gui.api.component.button.ListButton
 import com.lambda.gui.impl.AbstractClickGui
+import com.lambda.module.modules.client.ClickGui
 
 abstract class ListWindow<T : ListButton>(
     owner: AbstractClickGui,
 ) : WindowComponent<T>(owner) {
+    private var scrollOffset: Double = 0.0
+    private var rubberbandRequest = 0.0
+    private var rubberbandDelta = 0.0
+
     override fun onEvent(e: GuiEvent) {
-        if (e is GuiEvent.Tick) {
-            var y = 0.0
-            contentComponents.children.forEach { button ->
-                button.heightOffset = y
-                y += button.size.y + button.listStep
+        when (e) {
+            is GuiEvent.Tick -> {
+                rubberbandDelta += rubberbandRequest
+                rubberbandRequest = 0.0
+
+                rubberbandDelta *= 0.5
+                if (rubberbandDelta < 0.05) rubberbandDelta = 0.0
+
+                var y = scrollOffset + rubberbandDelta
+                contentComponents.children.forEach { button ->
+                    button.heightOffset = y
+                    y += button.size.y + button.listStep
+                }
+            }
+            is GuiEvent.MouseScroll -> {
+                val delta = e.delta * 10.0 * ClickGui.scrollSpeed
+                scrollOffset += delta
+
+                val prevOffset = scrollOffset
+                val range = -contentComponents.children.sumOf { it.size.y + it.listStep }
+                scrollOffset = scrollOffset.coerceAtLeast(range).coerceAtMost(0.0)
+
+                rubberbandRequest += prevOffset - scrollOffset
             }
         }
 

common/src/main/kotlin/com/lambda/gui/api/component/core/list/ChildLayer.kt

@@ -28,7 +28,7 @@ open class ChildLayer<T : ChildComponent, R : IComponent>(
                         childAccessible(child) && child.rect in rect && ownerAccessible && ownerComponent.isActive
                 }
 
-                is GuiEvent.KeyPress, is GuiEvent.CharTyped -> {
+                is GuiEvent.KeyPress, is GuiEvent.CharTyped, is GuiEvent.MouseScroll -> {
                     if (!child.accessible) return@forEach
                 }
 

common/src/main/kotlin/com/lambda/module/modules/client/ClickGui.kt

@@ -26,6 +26,7 @@ object ClickGui : Module(
     // Animation
     val openSpeed by setting("Open Speed", 0.5, 0.1..1.0, 0.01)
     val closeSpeed by setting("Close Speed", 0.5, 0.1..1.0, 0.01)
+    val scrollSpeed by setting("Scroll Speed", 1.0, 0.1..10.0, 0.01)
 
     // Alignment
     val allowHAlign by setting("Allow H Docking", false)