Remedy #1

containerbox.go

@@ -227,12 +227,6 @@ func (this *containerBox) notifyMinimumSizeChange (child anyBox) {
 	}
 }
 
-func (this *containerBox) boundedLayoutHints () tomo.LayoutHints {
-	hints := this.layoutHints()
-	hints.Bounds = this.ContentBounds().Add(this.InnerBounds().Min)
-	return hints
-}
-
 func (this *containerBox) layoutHints () tomo.LayoutHints {
 	return tomo.LayoutHints {
 		OverflowX: this.hOverflow,
@@ -247,7 +241,7 @@ func (this *containerBox) contentMinimum () image.Point {
 	minimum := this.box.contentMinimum()
 	if this.layout != nil {
 		layoutMinimum := this.layout.MinimumSize (
-			this.boundedLayoutHints(),
+			this.layoutHints(),
 			this.children)
 		if this.hOverflow { layoutMinimum.X = 0 }
 		if this.vOverflow { layoutMinimum.Y = 0 }
@@ -260,8 +254,8 @@ func (this *containerBox) doLayout () {
 	this.box.doLayout()
 	previousContentBounds := this.contentBounds
 
-	// by default, use innerBounds for contentBounds. if a direction
-	// overflows, use the layout's minimum size for it.
+	// by default, use innerBounds (translated to 0, 0) for contentBounds.
+	// if a direction overflows, use the layout's minimum size for it.
 	var minimum image.Point
 	if this.layout != nil {
 		minimum = this.layout.MinimumSize (
@@ -269,19 +263,33 @@ func (this *containerBox) doLayout () {
 			this.children)
 	}
 	innerBounds := this.InnerBounds()
-	this.contentBounds = innerBounds
+	this.contentBounds = innerBounds.Sub(innerBounds.Min)
 	if this.hOverflow { this.contentBounds.Max.X = this.contentBounds.Min.X + minimum.X }
 	if this.vOverflow { this.contentBounds.Max.Y = this.contentBounds.Min.Y + minimum.Y }
-
-	// offset the content bounds by the scroll so children can be positioned
-	// accordingly.
-	this.constrainScroll()
-	this.contentBounds = this.contentBounds.Add(this.scroll).Sub(innerBounds.Min)
 	
 	// arrange children
 	if this.layout != nil {
-		this.layout.Arrange(this.boundedLayoutHints(), this.children)
+		layoutHints := this.layoutHints()
+		layoutHints.Bounds = this.contentBounds
+		this.layout.Arrange(layoutHints, this.children)
 	}
+
+	// build an accurate contentBounds by unioning the bounds of all child
+	// boxes
+	this.contentBounds = image.Rectangle { }
+	for _, box := range this.children {
+		bounds := box.Bounds()
+		this.contentBounds = this.contentBounds.Union(bounds)
+	}
+
+	// constrain the scroll
+	this.constrainScroll()
+
+	// offset children and contentBounds by scroll
+	for _, box := range this.children {
+		box.SetBounds(box.Bounds().Add(this.scroll).Add(innerBounds.Min))
+	}
+	this.contentBounds = this.contentBounds.Add(this.scroll)
 	
 	if previousContentBounds != this.contentBounds {
 		this.on.contentBoundsChange.Broadcast()
@@ -321,6 +329,8 @@ func (this *containerBox) recursiveRedo () {
 }
 
 func (this *containerBox) boxUnder (point image.Point, category eventCategory) anyBox {
+	if !point.In(this.bounds) { return nil }
+
 	if !this.capture[category] {
 		for _, box := range this.children {
 			candidate := box.(anyBox).boxUnder(point, category)
@@ -328,7 +338,7 @@ func (this *containerBox) boxUnder (point image.Point, category eventCategory) a
 		}
 	}
 
-	return this.box.boxUnder(point, category)
+	return this
 }
 
 func (this *containerBox) propagate (callback func (anyBox) bool) bool {

event.go

@@ -161,16 +161,17 @@ func (window *window) handleConfigureNotify (
 	if window.root == nil { return }
 	
 	configureEvent := *event.ConfigureNotifyEvent
+	configureEvent = window.compressConfigureNotify(configureEvent)
 	
-	newWidth  := int(configureEvent.Width)
-	newHeight := int(configureEvent.Height)
-	sizeChanged :=
-		window.metrics.bounds.Dx() != newWidth ||
-		window.metrics.bounds.Dy() != newHeight
+	oldBounds := window.metrics.bounds
 	window.updateBounds()
+	newBounds := window.metrics.bounds
+
+	sizeChanged :=
+		oldBounds.Dx() != newBounds.Dx() ||
+		oldBounds.Dy() != newBounds.Dy()
 
 	if sizeChanged {
-		configureEvent = window.compressConfigureNotify(configureEvent)
 		window.reallocateCanvas()
 
 		// TODO figure out what to do with this