package objects

import "fmt"
import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/text"
import "git.tebibyte.media/tomo/tomo/event"

var _ tomo.Object = new(Heading)

// Heading is a label that denotes the start of some section of content. It can
// have a level from 0 to 2, with 0 being the most prominent and 2 being the
// most subtle.
//
// Tags:
//   - [0] The heading has a level of 0 (most prominent).
//   - [1] The heading has a level of 1.
//   - [2] The heading has a level of 2 (least prominent).
type Heading struct {
	box tomo.TextBox
}

// NewHeading creates a new section heading. The level can be from 0 to 2.
func NewHeading (level int, text string) *Heading {
	if level < 0 { level = 0 }
	if level > 2 { level = 2 }
	this := &Heading { box: tomo.NewTextBox() }
	this.box.SetRole(tomo.R("objects", "Heading"))
	this.box.SetTag(fmt.Sprint(level), true)
	this.SetText(text)
	this.box.SetSelectable(true)
	this.box.SetFocusable(true)
	return this
}

// GetBox returns the underlying box.
func (this *Heading) GetBox () tomo.Box {
	return this.box
}

// SetFocused sets whether or not this heading has keyboard focus. If set to
// true, this method will steal focus away from whichever object currently has
// focus.
func (this *Heading) SetFocused (focused bool) {
	this.box.SetFocused(focused)
}

// SetText sets the text content of the heading.
func (this *Heading) SetText (text string) {
	this.box.SetText(text)
}

// Select sets the text cursor or selection.
func (this *Heading) Select (dot text.Dot) {
	this.box.Select(dot)
}

// Dot returns the text cursor or selection.
func (this *Heading) Dot () text.Dot {
	return this.box.Dot()
}

// OnDotChange specifies a function to be called when the text cursor or
// selection changes.
func (this *Heading) OnDotChange (callback func ()) event.Cookie {
	return this.box.OnDotChange(callback)
}

// NewMenuHeading creatss a new heading for use in menus.
func NewMenuHeading (text string) *Heading {
	heading := NewHeading(0, text)
	heading.box.SetTag("menu", true)
	return heading
}