Add View intrinsic content size

src/main/kotlin/net/shadowfacts/asmr/TestScreen.kt

@@ -4,6 +4,7 @@ import net.shadowfacts.kiwidsl.dsl
 import net.shadowfacts.shadowui.Screen
 import net.shadowfacts.shadowui.View
 import net.shadowfacts.shadowui.Window
+import net.shadowfacts.shadowui.geometry.Size
 import net.shadowfacts.shadowui.util.Color
 
 class TestScreen: Screen() {
@@ -22,6 +23,7 @@ class TestScreen: Screen() {
 			val purple = green.addSubview(View().apply {
 				backgroundColor = Color(0x800080)
 			})
+			purple.intrinsicContentSize = Size(width = 150.0, height = 150.0)
 
 			solver.dsl {
 				red.leftAnchor equalTo 0
@@ -39,8 +41,8 @@ class TestScreen: Screen() {
 				blue.topAnchor equalTo (green.topAnchor + green.heightAnchor)
 				blue.heightAnchor equalTo 50
 
-				purple.widthAnchor equalTo 100
-				purple.heightAnchor equalTo 100
+//				purple.widthAnchor equalTo 100
+//				purple.heightAnchor equalTo 100
 				purple.centerXAnchor equalTo green.centerXAnchor
 				purple.centerYAnchor equalTo green.centerYAnchor
 			}

src/main/kotlin/net/shadowfacts/shadowui/View.kt

@@ -3,8 +3,10 @@ package net.shadowfacts.shadowui
 import com.mojang.blaze3d.platform.GlStateManager
 import net.shadowfacts.kiwidsl.dsl
 import net.shadowfacts.shadowui.geometry.Rect
+import net.shadowfacts.shadowui.geometry.Size
 import net.shadowfacts.shadowui.util.Color
 import net.shadowfacts.shadowui.util.RenderHelper
+import no.birkett.kiwi.Constraint
 import no.birkett.kiwi.Solver
 
 class View {
@@ -26,6 +28,14 @@ class View {
 	// The rectangle for this view in its own coordinate system.
 	lateinit var bounds: Rect
 
+	var intrinsicContentSize: Size? = null
+		set(value) {
+			updateIntrinsicContentSizeConstraints(intrinsicContentSize, value)
+			field = value
+		}
+	private var intrinsicContentSizeWidthConstraint: Constraint? = null
+	private var intrinsicContentSizeHeightConstraint: Constraint? = null
+
 	var backgroundColor = Color(0xff0000)
 
 	var parent: View? = null
@@ -54,6 +64,19 @@ class View {
 		}
 	}
 
+	private fun updateIntrinsicContentSizeConstraints(old: Size?, new: Size?) {
+		if (old != null) {
+			solver.removeConstraint(intrinsicContentSizeWidthConstraint!!)
+			solver.removeConstraint(intrinsicContentSizeHeightConstraint!!)
+		}
+		if (new != null) {
+			solver.dsl {
+				this@View.intrinsicContentSizeWidthConstraint = (widthAnchor.equalTo(new.width, strength = WEAK))
+				this@View.intrinsicContentSizeHeightConstraint = (heightAnchor.equalTo(new.height, strength = WEAK))
+			}
+		}
+	}
+
 	fun didLayout() {
 		subviews.forEach(View::didLayout)
 

src/main/kotlin/net/shadowfacts/shadowui/geometry/Rect.kt

@@ -2,14 +2,29 @@ package net.shadowfacts.shadowui.geometry
 
 data class Rect(val left: Double, val top: Double, val width: Double, val height: Double) {
 
-	val right: Double
-		get() = left + width
-	val bottom: Double
-		get() = top + height
+	val right: Double by lazy {
+		left + width
+	}
+	val bottom: Double by lazy {
+		top + height
+	}
 
-	val midX: Double
-		get() = left + width / 2
-	val midY: Double
-		get() = top + height / 2
+	val midX: Double by lazy {
+		left + width / 2
+	}
+	val midY: Double by lazy {
+		top + height / 2
+	}
+
+	val origin: Point by lazy {
+		Point(left, top)
+	}
+	val center: Point by lazy {
+		Point(midX, midY)
+	}
+
+	val size: Size by lazy {
+		Size(width, height)
+	}
 
 }

src/main/kotlin/net/shadowfacts/shadowui/geometry/Size.kt

@@ -0,0 +1,3 @@
+package net.shadowfacts.shadowui.geometry
+
+data class Size(val width: Double, val height: Double)