Added a toggle button and lamp pattern

backends/x/entity.go

@@ -79,6 +79,20 @@ func (entity *entity) propagate (callback func (*entity) bool) bool {
 	return callback(entity)
 }
 
+
+func (entity *entity) propagateAlt (callback func (*entity) bool) bool {
+	if !callback(entity) {
+		return false
+	}
+	
+	for _, child := range entity.children {
+		if !child.propagate(callback) {
+			return false
+		}
+	}
+
+	return true
+}
 func (entity *entity) childAt (point image.Point) *entity {
 	for _, child := range entity.children {
 		if point.In(child.bounds) {

backends/x/system.go

@@ -76,7 +76,7 @@ func (system *system) focus (entity *entity) {
 func (system *system) focusNext () {
 	found   := system.focused == nil
 	focused := false
-	system.propagate (func (entity *entity) bool {
+	system.propagateAlt (func (entity *entity) bool {
 		if found {
 			// looking for the next element to select
 			child, ok := entity.element.(tomo.Focusable)
@@ -118,6 +118,11 @@ func (system *system) propagate (callback func (*entity) bool) {
 	system.child.propagate(callback)
 }
 
+func (system *system) propagateAlt (callback func (*entity) bool) {
+	if system.child == nil { return }
+	system.child.propagateAlt(callback)
+}
+
 func (system *system) childAt (point image.Point) *entity {
 	if system.child == nil { return nil }
 	return system.child.childAt(point)