Buttons respond to enter key, window auto-selects root child

backends/x/window.go

@@ -77,7 +77,8 @@ func (backend *Backend) NewWindow (
 
 func (window *Window) Adopt (child tomo.Element) {
 	if window.child != nil {
-		child.SetParentHooks (tomo.ParentHooks {})
+		child.SetParentHooks (tomo.ParentHooks { })
+		if child.Selectable() { child.Handle(tomo.EventDeselect { }) }
 	}
 	window.child = child
 	if child != nil {
@@ -86,6 +87,7 @@ func (window *Window) Adopt (child tomo.Element) {
 			MinimumSizeChange: window.childMinimumSizeChangeCallback,
 			SelectionRequest: window.childSelectionRequestCallback,
 		})
+		if child.Selectable() { child.Handle(tomo.EventSelect { }) }
 		window.resizeChildToFit()
 	}
 	window.childMinimumSizeChangeCallback(child.MinimumSize())

elements/basic/button.go

@@ -47,6 +47,16 @@ func (element *Button) Handle (event tomo.Event) {
 			element.core.PushAll()
 		}
 
+	case tomo.EventKeyDown:
+		keyDownEvent := event.(tomo.EventKeyDown)
+		if keyDownEvent.Key == tomo.KeyEnter {
+			element.pressed = true
+			if element.core.HasImage() {
+				element.draw()
+				element.core.PushAll()
+			}
+		}
+
 	case tomo.EventMouseUp:
 		if !element.enabled { break }
 	
@@ -65,12 +75,24 @@ func (element *Button) Handle (event tomo.Event) {
 			element.onClick()
 		}
 
+	case tomo.EventKeyUp:
+		keyDownEvent := event.(tomo.EventKeyUp)
+		if keyDownEvent.Key == tomo.KeyEnter {
+			element.pressed = false
+			if element.core.HasImage() {
+				element.draw()
+				element.core.PushAll()
+			}
+			if element.onClick != nil {
+				element.onClick()
+			}
+		}
+
 	case tomo.EventSelect:
 		element.selected = true
 
 	case tomo.EventDeselect:
 		element.selected = false
-	// TODO: handle selection events, and the enter key
 	}
 	return
 }