Fun and testing elements conform to new API

elements/fun/clock.go

@@ -19,17 +19,11 @@ type AnalogClock struct {
 // NewAnalogClock creates a new analog clock that displays the specified time.
 func NewAnalogClock (newTime time.Time) (element *AnalogClock) {
 	element = &AnalogClock { }
-	element.Core, element.core = core.NewCore(element)
+	element.Core, element.core = core.NewCore(element.draw)
 	element.core.SetMinimumSize(64, 64)
 	return
 }
 
-// Resize changes the size of the clock.
-func (element *AnalogClock) Resize (width, height int) {
-	element.core.AllocateCanvas(width, height)
-	element.draw()
-}
-
 // SetTime changes the time that the clock displays.
 func (element *AnalogClock) SetTime (newTime time.Time) {
 	if newTime == element.time { return }

elements/testing/artist.go

@@ -19,13 +19,12 @@ type Artist struct {
 // NewArtist creates a new artist test element.
 func NewArtist () (element *Artist) {
 	element = &Artist { }
-	element.Core, element.core = core.NewCore(element)
+	element.Core, element.core = core.NewCore(element.draw)
 	element.core.SetMinimumSize(480, 600)
 	return
 }
 
-func (element *Artist) Resize (width, height int) {
-	element.core.AllocateCanvas(width, height)
+func (element *Artist) draw () {
 	bounds := element.Bounds()
 	element.cellBounds.Max.X = bounds.Dx() / 5
 	element.cellBounds.Max.Y = (bounds.Dy() - 48) / 8

elements/testing/mouse.go

@@ -20,14 +20,13 @@ type Mouse struct {
 // NewMouse creates a new mouse test element.
 func NewMouse () (element *Mouse) {
 	element = &Mouse { }
-	element.Core, element.core = core.NewCore(element)
+	element.Core, element.core = core.NewCore(element.draw)
 	element.core.SetMinimumSize(32, 32)
 	element.color = artist.NewUniform(color.Black)
 	return
 }
 
-func (element *Mouse) Resize (width, height int) {
-	element.core.AllocateCanvas(width, height)
+func (element *Mouse) draw () {
 	bounds := element.Bounds()
 	pattern, _ := theme.AccentPattern(theme.PatternState { })
 	artist.FillRectangle(element.core, pattern, bounds)