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