Cacao: Add tab tooltips

src/main/kotlin/net/shadowfacts/cacao/util/RenderHelper.kt

@@ -8,6 +8,8 @@ import net.minecraft.client.render.*
 import net.minecraft.client.sound.PositionedSoundInstance
 import net.minecraft.client.util.math.MatrixStack
 import net.minecraft.sound.SoundEvent
+import net.minecraft.text.OrderedText
+import net.minecraft.text.Text
 import net.minecraft.util.math.Matrix4f
 import net.shadowfacts.cacao.geometry.Point
 import net.shadowfacts.cacao.geometry.Rect
@@ -20,7 +22,7 @@ import org.lwjgl.opengl.GL11
  *
  * @author shadowfacts
  */
-object RenderHelper {
+object RenderHelper: DrawableHelper() {
 
 	val disabled = (System.getProperty("cacao.drawing.disabled") ?: "false").toBoolean()
 
@@ -35,7 +37,7 @@ object RenderHelper {
 	 */
 	fun fill(matrixStack: MatrixStack, rect: Rect, color: Color) {
 		if (disabled) return
-		DrawableHelper.fill(matrixStack, rect.left.toInt(), rect.top.toInt(), rect.right.toInt(), rect.bottom.toInt(), color.argb)
+		fill(matrixStack, rect.left.toInt(), rect.top.toInt(), rect.right.toInt(), rect.bottom.toInt(), color.argb)
 	}
 
 	/**
@@ -85,6 +87,87 @@ object RenderHelper {
 		BufferRenderer.draw(bufferBuilder)
 	}
 
+	fun drawTooltip(matrixStack: MatrixStack, text: Text, mouse: Point) {
+		drawTooltip(matrixStack, listOf(text.asOrderedText()), mouse)
+	}
+
+	fun drawTooltip(matrixStack: MatrixStack, texts: List<Text>, mouse: Point) {
+		drawTooltip(matrixStack, texts.map(Text::asOrderedText), mouse)
+	}
+
+	// Based on Screen.renderOrderedTooltip
+	@JvmName("drawOrderedTooltip")
+	fun drawTooltip(matrixStack: MatrixStack, texts: List<OrderedText>, mouse: Point) {
+		if (disabled) return
+		if (texts.isEmpty()) return
+
+		val client = MinecraftClient.getInstance()
+		val textRenderer = client.textRenderer
+
+		val maxWidth = texts.maxOf(textRenderer::getWidth)
+
+		var x = mouse.x.toInt() + 12
+		var y = mouse.y.toInt() - 12
+		var p = 8
+		if (texts.size > 1) {
+			p += 2 + (texts.size - 1) * 8
+		}
+
+		if (x + maxWidth > client.window.scaledWidth) {
+			x -= 28 + maxWidth
+		}
+
+		if (y + p + 6 > client.window.scaledHeight) {
+			y = client.window.scaledHeight - p - 6
+		}
+
+		matrixStack.push()
+		val q = -267386864
+		val r = 1347420415
+		val s = 1344798847
+		val t = 1
+		val tessellator = Tessellator.getInstance()
+		val buffer = tessellator.buffer
+		buffer.begin(GL11.GL_QUADS, VertexFormats.POSITION_COLOR)
+		val matrix = matrixStack.peek().model
+		val z = 400
+		fillGradient(matrix, buffer, x - 3, y - 4, x + maxWidth + 3, y - 3, z, q, q)
+		fillGradient(matrix, buffer, x - 3, y + p + 3, x + maxWidth + 3, y + p + 4, z, q, q)
+		fillGradient(matrix, buffer, x - 3, y - 3, x + maxWidth + 3, y + p + 3, z, q, q)
+		fillGradient(matrix, buffer, x - 4, y - 3, x - 3, y + p + 3, z, q, q)
+		fillGradient(matrix, buffer, x + maxWidth + 3, y - 3, x + maxWidth + 4, y + p + 3, z, q, q)
+		fillGradient(matrix, buffer, x - 3, y - 3 + 1, x - 3 + 1, y + p + 3 - 1, z, r, s)
+		fillGradient(matrix, buffer, x + maxWidth + 2, y - 3 + 1, x + maxWidth + 3, y + p + 3 - 1, z, r, s)
+		fillGradient(matrix, buffer, x - 3, y - 3, x + maxWidth + 3, y - 3 + 1, z, r, r)
+		fillGradient(matrix, buffer, x - 3, y + p + 2, x + maxWidth + 3, y + p + 3, z, s, s)
+		RenderSystem.enableDepthTest()
+		RenderSystem.disableTexture()
+		RenderSystem.enableBlend()
+		RenderSystem.defaultBlendFunc()
+		RenderSystem.shadeModel(7425)
+		buffer.end()
+		BufferRenderer.draw(buffer)
+		RenderSystem.shadeModel(7424)
+		RenderSystem.disableBlend()
+		RenderSystem.enableTexture()
+		val immediate = VertexConsumerProvider.immediate(buffer)
+
+		matrixStack.translate(0.0, 0.0, 400.0)
+
+		for (i in texts.indices) {
+			val text = texts[i]
+			textRenderer.draw(text, x.toFloat(), y.toFloat(), -1, true, matrix, immediate, false, 0, 15728880)
+
+			if (i == 0) {
+				y += 2
+			}
+
+			y += 10
+		}
+
+		immediate.draw()
+		matrixStack.pop()
+	}
 
 	/**
 	 * @see org.lwjgl.opengl.GL11.glPushMatrix

src/main/kotlin/net/shadowfacts/cacao/viewcontroller/TabViewController.kt

@@ -1,5 +1,6 @@
 package net.shadowfacts.cacao.viewcontroller
 
+import net.minecraft.client.util.math.MatrixStack
 import net.minecraft.text.Text
 import net.minecraft.util.Identifier
 import net.shadowfacts.cacao.geometry.Axis
@@ -139,6 +140,14 @@ class TabViewController<T: TabViewController.Tab>(
 
 		override fun getCurrentBackground(mouse: Point) = backgroundView
 
+		override fun draw(matrixStack: MatrixStack, mouse: Point, delta: Float) {
+			super.draw(matrixStack, mouse, delta)
+
+			if (mouse in bounds && tab.tooltip != null) {
+				window!!.drawTooltip(listOf(tab.tooltip!!))
+			}
+		}
+
 		override fun mouseClicked(point: Point, mouseButton: MouseButton): Boolean {
 			if (selected) return false
 			else return super.mouseClicked(point, mouseButton)

src/main/kotlin/net/shadowfacts/cacao/window/Window.kt

@@ -1,17 +1,20 @@
 package net.shadowfacts.cacao.window
 
 import net.minecraft.client.util.math.MatrixStack
+import net.minecraft.text.Text
 import net.shadowfacts.cacao.AbstractCacaoScreen
 import net.shadowfacts.cacao.CacaoScreen
 import net.shadowfacts.cacao.Responder
 import net.shadowfacts.cacao.geometry.Point
 import net.shadowfacts.cacao.util.MouseButton
+import net.shadowfacts.cacao.util.RenderHelper
 import net.shadowfacts.cacao.view.View
 import net.shadowfacts.cacao.viewcontroller.ViewController
 import net.shadowfacts.kiwidsl.dsl
 import no.birkett.kiwi.Constraint
 import no.birkett.kiwi.Solver
 import no.birkett.kiwi.Variable
+import java.lang.RuntimeException
 
 /**
  * A Window is the object at the top of a Cacao view hierarchy. It occupies the entirety of the Minecraft screen size
@@ -88,6 +91,8 @@ open class Window(
 
 	private var currentDragReceiver: View? = null
 
+	private var currentDeferredTooltip: List<Text>? = null
+
 	init {
 		createInternalConstraints()
 	}
@@ -168,8 +173,21 @@ open class Window(
 	 * @param delta The time elapsed since the last frame.
 	 */
 	open fun draw(matrixStack: MatrixStack, mouse: Point, delta: Float) {
+		currentDeferredTooltip = null
+
 		val mouseInView = Point(mouse.x - viewController.view.frame.left, mouse.y - viewController.view.frame.top)
 		viewController.view.draw(matrixStack, mouseInView, delta)
+
+		if (currentDeferredTooltip != null) {
+			RenderHelper.drawTooltip(matrixStack, currentDeferredTooltip!!, mouse)
+		}
+	}
+
+	fun drawTooltip(text: List<Text>) {
+		if (currentDeferredTooltip != null) {
+			throw RuntimeException("Deferred tooltip already registered for current frame")
+		}
+		currentDeferredTooltip = text
 	}
 
 	/**