Container no longer embeds tomo.ContainerBox

Progress on #7

container.go

@@ -1,6 +1,8 @@
 package objects
 
+import "image"
 import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/event"
 
 // Container is an object that can contain other objects. It can be used as a
 // primitive for building more complex layouts. It has two variants: an outer
@@ -8,14 +10,14 @@ import "git.tebibyte.media/tomo/tomo"
 // its edges, whereas the inner container does not. The container will have a
 // corresponding object role variation of either "outer" or "inner".
 type Container struct {
-	tomo.ContainerBox
+	box tomo.ContainerBox
 }
 
 func newContainer (layout tomo.Layout, children ...tomo.Object) *Container {
 	this := &Container {
-		ContainerBox: tomo.NewContainerBox(),
+		box: tomo.NewContainerBox(),
 	}
-	this.SetAttr(tomo.ALayout(layout))
+	this.box.SetAttr(tomo.ALayout(layout))
 	for _, child := range children {
 		this.Add(child)
 	}
@@ -27,8 +29,8 @@ func newContainer (layout tomo.Layout, children ...tomo.Object) *Container {
 // window, tab pane, etc.
 func NewOuterContainer (layout tomo.Layout, children ...tomo.Object) *Container {
 	this := newContainer(layout, children...)
-	this.SetRole(tomo.R("objects", "Container"))
+	this.box.SetRole(tomo.R("objects", "Container"))
-	this.SetTag("outer", true)
+	this.box.SetTag("outer", true)
 	return this
 }
 
@@ -36,20 +38,87 @@ func NewOuterContainer (layout tomo.Layout, children ...tomo.Object) *Container
 // around it. It is meant to be used as a root container for a ScrollContainer.
 func NewSunkenContainer (layout tomo.Layout, children ...tomo.Object) *Container {
 	this := newContainer(layout, children...)
-	this.SetRole(tomo.R("objects", "Container"))
+	this.box.SetRole(tomo.R("objects", "Container"))
-	this.SetTag("sunken", true)
+	this.box.SetTag("sunken", true)
 	return this
 }
 
 // NewInnerContainer creates a new container that has no padding around it.
 func NewInnerContainer (layout tomo.Layout, children ...tomo.Object) *Container {
 	this := newContainer(layout, children...)
-	this.SetRole(tomo.R("objects", "Container"))
+	this.box.SetRole(tomo.R("objects", "Container"))
-	this.SetTag("inner", true)
+	this.box.SetTag("inner", true)
 	return this
 }
 
+// GetBox returns the underlying box.
+func (this *Container) GetBox () tomo.Box {
+	return this.box
+}
+
+// ContentBounds returns the bounds of the inner content of the container
+// relative to the container's InnerBounds.
+func (this *Container) ContentBounds () image.Rectangle {
+	return this.box.ContentBounds()
+}
+
+// ScrollTo shifts the origin of the container's content to the origin of the
+// container's InnerBounds, offset by the given point.
+func (this *Container) ScrollTo (position image.Point) {
+	this.box.ScrollTo(position)
+}
+
+// OnContentBoundsChange specifies a function to be called when the container's
+// ContentBounds or InnerBounds changes.
+func (this *Container) OnContentBoundsChange (callback func ()) event.Cookie {
+	return this.box.OnContentBoundsChange(callback)
+}
+
 // SetLayout sets the layout of the container.
 func (this *Container) SetLayout (layout tomo.Layout) {
-	this.SetAttr(tomo.ALayout(layout))
+	this.box.SetAttr(tomo.ALayout(layout))
+}
+
+// SetAlign sets the X and Y alignment of the container.
+func (this *Container) SetAlign (x, y tomo.Align) {
+	this.box.SetAttr(tomo.AAlign(x, y))
+}
+
+// SetOverflow sets the X and Y overflow of the container.
+func (this *Container) SetOverflow (x, y bool) {
+	this.box.SetAttr(tomo.AOverflow(x, y))
+}
+
+// Add appends a child object. If the object is already a child of another
+// object, it will be removed from that object first.
+func (this *Container) Add (object tomo.Object) {
+	this.box.Add(object)
+}
+
+// Remove removes a child object, if it is a child of this container.
+func (this *Container) Remove (object tomo.Object) {
+	this.box.Remove(object)
+}
+
+// Insert inserts a child object before a specified object. If the before object
+// is nil or is not contained within this container, the inserted object is
+// appended. If the inserted object is already a child of another object, it
+// will be removed from that object first.
+func (this *Container) Insert (child tomo.Object, before tomo.Object) {
+	this.box.Insert(child, before)
+}
+
+// Clear removes all child objects.
+func (this *Container) Clear () {
+	this.box.Clear()
+}
+
+// Len returns hte amount of child objects.
+func (this *Container) Len () int {
+	return this.box.Len()
+}
+
+// At returns the child object at the specified index.
+func (this *Container) At (index int) tomo.Object {
+	return this.box.At(index)
 }

dialog.go

@@ -16,7 +16,7 @@ type DialogKind int; const (
 // Dialog is a modal dialog window.
 type Dialog struct {
 	tomo.Window
-	controlRow tomo.ContainerBox
+	controlRow *Container
 }
 
 type clickable interface {
@@ -64,7 +64,7 @@ func NewDialog (kind DialogKind, parent tomo.Window, title, message string, opti
 		}
 	}
 	dialog.controlRow = NewInnerContainer(layouts.ContractHorizontal, options...)
-	dialog.controlRow.SetAttr(tomo.AAlign(tomo.AlignEnd, tomo.AlignEnd))
+	dialog.controlRow.SetAlign(tomo.AlignEnd, tomo.AlignEnd)
 
 	dialog.SetRoot(NewOuterContainer (
 		layouts.Column { true, false },

swatch.go

@@ -129,7 +129,7 @@ func (this *Swatch) Choose () {
 		layouts.ContractHorizontal,
 		cancelButton,
 		okButton)
-	controlRow.SetAttr(tomo.AAlign(tomo.AlignEnd, tomo.AlignMiddle))
+	controlRow.SetAlign(tomo.AlignEnd, tomo.AlignMiddle)
 	window.SetRoot(NewOuterContainer (
 		layouts.Column { true, false },
 		colorPicker,