objects/button.go

107 lines
2.6 KiB
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 buttonLayout = layouts.Row { true }
var iconButtonLayout = layouts.Row { true }
var bothButtonLayout = layouts.Row { false, true }
// Button is a clickable button.
type Button struct {
tomo.ContainerBox
label *Label
icon *Icon
labelActive bool
on struct {
click event.FuncBroadcaster
}
}
// NewButton creates a new button with the specified text.
func NewButton (text string) *Button {
box := &Button {
ContainerBox: tomo.NewContainerBox(),
label: NewLabel(text),
}
box.SetRole(tomo.R("objects", "Button"))
box.label.SetAttr(tomo.AAlign(tomo.AlignMiddle, tomo.AlignMiddle))
box.SetLayout(buttonLayout)
box.SetText(text)
box.CatchDND(true)
box.CatchMouse(true)
box.OnButtonDown(box.handleButtonDown)
box.OnButtonUp(box.handleButtonUp)
box.OnKeyUp(box.handleKeyUp)
box.SetFocusable(true)
return box
}
// SetText sets the text of the button's label.
func (this *Button) SetText (text string) {
this.label.SetText(text)
if this.labelActive && text == "" {
this.Remove(this.label)
this.labelActive = false
}
if !this.labelActive && text != "" {
this.Add(this.label)
this.labelActive = true
}
this.applyLayout()
}
// SetIcon sets an icon for this button. Setting the icon to IconUnknown will
// remove it.
func (this *Button) SetIcon (id tomo.Icon) {
if this.icon != nil { this.Remove(this.icon) }
var icon *Icon; if id != tomo.IconUnknown {
icon = NewIcon(id, tomo.IconSizeSmall)
}
this.icon = icon
if this.icon != nil {
this.Insert(this.icon, this.label)
}
this.applyLayout()
}
// OnClick specifies a function to be called when the button is clicked.
func (this *Button) OnClick (callback func ()) event.Cookie {
return this.on.click.Connect(callback)
}
func (this *Button) applyLayout () {
if this.labelActive && this.icon == nil {
this.SetLayout(buttonLayout)
} else if !this.labelActive && this.icon != nil {
this.SetLayout(iconButtonLayout)
} else {
this.SetLayout(bothButtonLayout)
}
}
func (this *Button) handleKeyUp (catch func (), key input.Key, numberPad bool) {
if key != input.KeyEnter && key != input.Key(' ') { return }
this.on.click.Broadcast()
}
func (this *Button) handleButtonDown (catch func (), button input.Button) {
catch()
}
func (this *Button) handleButtonUp (catch func (), button input.Button) {
catch()
if button != input.ButtonLeft { return }
if this.Window().MousePosition().In(this.Bounds()) {
this.on.click.Broadcast()
}
}