Dialog boxes have icons now

Closes #8

dialog.go

@@ -53,6 +53,7 @@ func NewDialog (kind DialogKind, parent tomo.Window, title, message string, opti
 	case DialogError:       iconId = tomo.IconDialogError
 	}
 	dialog.SetTitle(title)
+	dialog.SetIcon(iconId)
 	icon := NewIcon(iconId, tomo.IconSizeLarge)
 	messageText := NewLabel(message)
 	messageText.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))

labelswatch.go

@@ -24,6 +24,8 @@ func NewLabelSwatch (value color.Color, text string) *LabelSwatch {
 	box.SetRole(tomo.R("objects", "LabelSwatch"))
 	box.swatch.label = text
 	box.label.SetAttr(tomo.AAlign(tomo.AlignStart, tomo.AlignMiddle))
+	box.label.SetSelectable(false)
+	box.label.SetFocusable(false)
 	box.Add(box.swatch)
 	box.Add(box.label)
 	box.SetAttr(tomo.ALayout(layouts.Row { false, true }))
@@ -61,12 +63,12 @@ func (this *LabelSwatch) OnConfirm (callback func ()) event.Cookie {
 }
 
 func (this *LabelSwatch) handleButtonDown (button input.Button) bool {
-	if button != input.ButtonLeft { return true }
+	if !isClickingButton(button) { return true }
 	return true
 }
 
 func (this *LabelSwatch) handleButtonUp (button input.Button) bool {
-	if button != input.ButtonLeft { return true }
+	if !isClickingButton(button) { return true }
 	if this.Window().MousePosition().In(this.Bounds()) {
 		this.swatch.SetFocused(true)
 		this.swatch.Choose()

scrollbar.go

@@ -9,7 +9,7 @@ import "git.tebibyte.media/tomo/tomo/event"
 // overflowing ContainerBox.
 type Scrollbar struct {
 	tomo.ContainerBox
-	handle     *SliderHandle
+	handle     *sliderHandle
 	layout     scrollbarLayout
 	dragging   bool
 	dragOffset image.Point
@@ -24,7 +24,7 @@ type Scrollbar struct {
 func newScrollbar (orient string) *Scrollbar {
 	this := &Scrollbar {
 		ContainerBox: tomo.NewContainerBox(),
-		handle: &SliderHandle {
+		handle: &sliderHandle {
 			Box: tomo.NewBox(),
 		},
 		layout: scrollbarLayout {
@@ -43,9 +43,9 @@ func newScrollbar (orient string) *Scrollbar {
 	this.OnMouseMove(this.handleMouseMove)
 	this.OnScroll(this.handleScroll)
 	
-	this.handle.SetRole(tomo.R("objects", "SliderHandle"))
+	this.handle.SetRole(tomo.R("objects", "ScrollbarHandle"))
 	this.handle.SetTag(orient, true)
-	this.SetRole(tomo.R("objects", "Slider"))
+	this.SetRole(tomo.R("objects", "Scrollbar"))
 	this.SetTag(orient, true)
 	return this
 }

slider.go

@@ -9,7 +9,7 @@ import "git.tebibyte.media/tomo/tomo/event"
 // Slider is a control that selects a numeric value between 0 and 1.
 type Slider struct {
 	tomo.ContainerBox
-	handle     *SliderHandle
+	handle     *sliderHandle
 	layout     sliderLayout
 	dragging   bool
 	dragOffset image.Point
@@ -21,16 +21,14 @@ type Slider struct {
 	}
 }
 
-// SliderHandle is a simple object that serves as a handle for sliders and
-// scrollbars. It is completely inert.
-type SliderHandle struct {
+type sliderHandle struct {
 	tomo.Box
 }
 
 func newSlider (orient string, value float64) *Slider {
 	this := &Slider {
 		ContainerBox: tomo.NewContainerBox(),
-		handle: &SliderHandle {
+		handle: &sliderHandle {
 			Box: tomo.NewBox(),
 		},
 		layout: sliderLayout {