package objects

import "image"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/event"

type abstractContainer struct {
	box tomo.ContainerBox
}

func (this *abstractContainer) init (layout tomo.Layout, children ...tomo.Object) {
	this.box = tomo.NewContainerBox()
	this.SetLayout(layout)
	for _, child := range children {
		this.Add(child)
	}
}

// GetBox returns the underlying box.
func (this *abstractContainer) 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 *abstractContainer) 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 *abstractContainer) 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 *abstractContainer) OnContentBoundsChange (callback func ()) event.Cookie {
	return this.box.OnContentBoundsChange(callback)
}

// SetLayout sets the layout of the container.
func (this *abstractContainer) SetLayout (layout tomo.Layout) {
	if layout == nil {
		this.box.UnsetAttr(tomo.AttrKindLayout)
	} else {
		this.box.SetAttr(tomo.ALayout(layout))
	}
}

// SetAlign sets the X and Y alignment of the container.
func (this *abstractContainer) SetAlign (x, y tomo.Align) {
	this.box.SetAttr(tomo.AAlign(x, y))
}

// SetOverflow sets the X and Y overflow of the container.
func (this *abstractContainer) 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 *abstractContainer) Add (object tomo.Object) {
	this.box.Add(object)
}

// Remove removes a child object, if it is a child of this container.
func (this *abstractContainer) 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 *abstractContainer) Insert (child tomo.Object, before tomo.Object) {
	this.box.Insert(child, before)
}

// Clear removes all child objects.
func (this *abstractContainer) Clear () {
	this.box.Clear()
}

// Len returns hte amount of child objects.
func (this *abstractContainer) Len () int {
	return this.box.Len()
}

// At returns the child object at the specified index.
func (this *abstractContainer) At (index int) tomo.Object {
	return this.box.At(index)
}