objects/menuitem.go

package objects

import "git.tebibyte.media/tomo/tomo"
import "git.tebibyte.media/tomo/tomo/input"
import "git.tebibyte.media/tomo/tomo/event"
import "git.tebibyte.media/tomo/objects/layouts"

// MenuItem is a selectable memu item.
type MenuItem struct {
	tomo.ContainerBox

	label *Label
	icon  *Icon
	labelActive bool
	
	on struct {
		click event.FuncBroadcaster
	}
}

// NewMenuItem creates a new menu item with the specified text.
func NewMenuItem (text string) *MenuItem {
	box := &MenuItem {
		ContainerBox: tomo.NewContainerBox(),
		label:        NewLabel(text),
		icon:         NewIcon("", tomo.IconSizeSmall),
	}
	box.SetRole(tomo.R("objects", "MenuItem"))
	box.label.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))
	box.SetAttr(tomo.ALayout(layouts.Row { false, true }))
	
	box.Add(box.icon)
	box.Add(box.label)
	
	box.SetInputMask(true)
	box.OnButtonDown(box.handleButtonDown)
	box.OnButtonUp(box.handleButtonUp)
	box.OnKeyDown(box.handleKeyDown)
	box.OnKeyUp(box.handleKeyUp)
	box.SetFocusable(true)
	return box
}

// SetText sets the text of the items's label.
func (this *MenuItem) SetText (text string) {
	this.label.SetText(text)
}

// SetIcon sets an icon for this item. Setting the icon to IconUnknown will
// remove it.
func (this *MenuItem) SetIcon (id tomo.Icon) {
	if this.icon != nil { this.Remove(this.icon) }
	this.Insert(NewIcon(id, tomo.IconSizeSmall), this.label)
}

// OnClick specifies a function to be called when the menu item is clicked.
func (this *MenuItem) OnClick (callback func ()) event.Cookie {
	return this.on.click.Connect(callback)
}

func (this *MenuItem) handleKeyDown (key input.Key, numberPad bool) bool {
	if key != input.KeyEnter && key != input.Key(' ') { return false }
	return true
}

func (this *MenuItem) handleKeyUp (key input.Key, numberPad bool) bool {
	if key != input.KeyEnter && key != input.Key(' ') { return false }
	this.on.click.Broadcast()
	return true
}

func (this *MenuItem) handleButtonDown (button input.Button) bool {
	if button != input.ButtonLeft { return false }
	return true
}

func (this *MenuItem) handleButtonUp (button input.Button) bool {
	if button != input.ButtonLeft { return false }
	if this.Window().MousePosition().In(this.Bounds()) {
		this.on.click.Broadcast()
	}
	return true
}