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"

var _ tomo.Object = new(MenuItem)

// MenuItem is a selectable memu item.
type MenuItem struct {
	box 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 {
	return NewIconMenuItem(tomo.IconUnknown, text)
}

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

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

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

// 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) {
	this.icon.SetIcon(id, tomo.IconSizeSmall)
}

// 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) handleMouseEnter () {
	this.SetFocused(true)
}

func (this *MenuItem) handleMouseLeave () {
	this.SetFocused(false)
}

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.box.Window().MousePosition().In(this.box.Bounds()) {
		this.on.click.Broadcast()
	}
	return true
}