Added extended selection capabilities to the API

elements/basic/button.go

@@ -12,7 +12,6 @@ type Button struct {
 	
 	pressed  bool
 	enabled  bool
-	selected bool
 	onClick func ()
 
 	text   string
@@ -91,10 +90,10 @@ func (element *Button) Handle (event tomo.Event) {
 		}
 
 	case tomo.EventSelect:
-		element.selected = true
+		element.core.SetSelected(true)
 
 	case tomo.EventDeselect:
-		element.selected = false
+		element.core.SetSelected(false)
 	}
 	return
 }
@@ -103,16 +102,6 @@ func (element *Button) OnClick (callback func ()) {
 	element.onClick = callback
 }
 
-func (element *Button) AdvanceSelection (direction int) (ok bool) {
-	wasSelected := element.selected
-	element.selected = false
-	if element.core.HasImage() && wasSelected {
-		element.draw()
-		element.core.PushAll()
-	}
-	return
-}
-
 func (element *Button) Select () {
 	element.core.Select()
 }
@@ -150,7 +139,7 @@ func (element *Button) draw () {
 		theme.RaisedProfile (
 			element.pressed,
 			element.enabled,
-			element.selected),
+			element.Selected()),
 		bounds)
 		
 	innerBounds := bounds

elements/basic/container.go

@@ -13,6 +13,7 @@ type Container struct {
 	layout     tomo.Layout
 	children   []tomo.LayoutEntry
 	selectable bool
+	selected   bool
 
 	drags [10]tomo.Element
 }
@@ -183,6 +184,16 @@ func (element *Container) Handle (event tomo.Event) {
 				Y: mouseMoveEvent.Y - childPosition.Y,
 			})
 		}
+
+	case tomo.EventSelect:
+		if !element.Selectable() { break }
+		element.core.SetSelected(true)
+
+	case tomo.EventDeselect:
+		element.core.SetSelected(false)
+		// TODO: propogate deselect event to all children who report
+		// themselves as selected.
+		
 	}
 	return
 }
@@ -198,6 +209,7 @@ func (element *Container) updateSelectable () {
 		if entry.Selectable() { selectable = true }
 	}
 	element.core.SetSelectable(selectable)
+	if !selectable { element.selected = false }
 }
 
 func (element *Container) updateMinimumSize () {

elements/basic/label.go

@@ -84,10 +84,6 @@ func (element *Label) updateMinimumSize () {
 	}
 }
 
-func (element *Label) AdvanceSelection (direction int) (ok bool) {
-	return
-}
-
 func (element *Label) draw () {
 	bounds := element.core.Bounds()
 

elements/basic/test.go

@@ -3,6 +3,7 @@ package basic
 import "image"
 import "image/color"
 import "git.tebibyte.media/sashakoshka/tomo"
+import "git.tebibyte.media/sashakoshka/tomo/theme"
 import "git.tebibyte.media/sashakoshka/tomo/artist"
 import "git.tebibyte.media/sashakoshka/tomo/elements/core"
 
@@ -33,9 +34,7 @@ func (element *Test) Handle (event tomo.Event) {
 			resizeEvent.Height)
 		artist.Rectangle (
 			element.core,
-			artist.NewUniform (color.RGBA {
-				R: 0x40, G: 0x80, B: 0x90, A: 0xFF,
-			}),
+			theme.AccentImage(),
 			artist.NewUniform(color.Black),
 			1, element.Bounds())
 		artist.Line (
@@ -46,7 +45,6 @@ func (element *Test) Handle (event tomo.Event) {
 			element.core, artist.NewUniform(color.White), 1,
 			image.Pt(1, resizeEvent.Height - 2),
 			image.Pt(resizeEvent.Width - 2, 1))
-		// println(resizeEvent.Width, resizeEvent.Height)
 	
 	case tomo.EventMouseDown:
 		element.drawing = true
@@ -78,7 +76,3 @@ func (element *Test) Handle (event tomo.Event) {
 	}
 	return
 }
-
-func (element *Test) AdvanceSelection (direction int) (ok bool) {
-	return
-}