holy crap click handling works too

common/elements/v1/mouse/mouse.go

@@ -1,6 +1,7 @@
 package mouse
 
 import (
+	"git.vezzani.net/ben/games/common/elements/v1"
 	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 )
@@ -11,6 +12,14 @@ func (n NopHandler) HandleMouseEvent(s State) bool {
 	return false
 }
 
+type ChildrenProvider interface {
+	GetChildren() []elements.Element
+}
+
+type EventHandler interface {
+	HandleMouseEvent(s State) bool
+}
+
 type State struct {
 	X, Y                      int
 	LeftDown, RightDown       bool
@@ -19,13 +28,30 @@ type State struct {
 	Clicked                   bool
 }
 
-//func ClickHandler(e elements.Element) func() bool {
-//	newState := StateBuilder()
-//	return func() bool {
-//		_ = newState()
-//		if
-//	}
-//}
+func Handler(e elements.Element) func() bool {
+	newState := StateBuilder()
+	ms := newState()
+	return func() bool {
+		ms = newState()
+		return propagateMouse(e, ms)
+	}
+}
+
+func propagateMouse(e elements.Element, ms State) bool {
+	if p, ok := e.(ChildrenProvider); ok {
+		for _, c := range p.GetChildren() {
+			if propagateMouse(c, ms) {
+				return true
+			}
+		}
+	}
+
+	if e, ok := e.(EventHandler); ok {
+		return e.HandleMouseEvent(ms)
+	}
+
+	return false
+}
 
 func StateBuilder() func() State {
 	prevState := State{}
@@ -57,6 +83,8 @@ func StateBuilder() func() State {
 
 		state.LeftChanged = state.LeftDown != prevState.LeftDown
 		state.RightChanged = state.RightDown != prevState.RightDown
+		state.LeftClicked = state.LeftChanged && state.LeftDown
+		state.RightClicked = state.RightChanged && state.RightDown
 
 		prevState = state
 		return state