Add ui.Keys

example/blocks/game.go

@@ -70,7 +70,7 @@ func (game *Game) Update(state ui.CanvasState) {
 	if !game.isInitialized() {
 		return
 	}
-	game.input.Update(state.Keys)
+	game.input.Update(state.PressedKeys)
 	game.sceneManager.Update(&GameState{
 		SceneManager: game.sceneManager,
 		Input:        game.input,

example/blocks/input.go

@@ -22,14 +22,9 @@ func (i *Input) StateForKey(key ui.Key) int {
 	return i.states[key]
 }
 
-func (i *Input) Update(keys []ui.Key) {
+func (i *Input) Update(keys ui.Keys) {
-	pressedKeys := map[ui.Key]struct{}{}
-	for _, key := range keys {
-		pressedKeys[key] = struct{}{}
-	}
-
 	for key, _ := range i.states {
-		if _, ok := pressedKeys[key]; !ok {
+		if !keys.Includes(key) {
 			i.states[key] = 0
 			continue
 		}

ui/cocoa/game_window.go

@@ -26,11 +26,29 @@ import (
 	"unsafe"
 )
 
+type Keys map[ui.Key]struct{}
+
+func newKeys() Keys {
+	return Keys(map[ui.Key]struct{}{})
+}
+
+func (k Keys) add(key ui.Key) {
+	k[key] = struct{}{}
+}
+
+func (k Keys) remove(key ui.Key) {
+	delete(k, key)
+}
+
+func (k Keys) Includes(key ui.Key) bool {
+	_, ok := k[key]
+	return ok
+}
+
 type GameWindow struct {
 	state     ui.CanvasState
 	title     string
 	native    *C.EbitenGameWindow
-	pressedKeys map[ui.Key]struct{}
 	funcs     chan func(*opengl.Context)
 	funcsDone chan struct{}
 	closed    chan struct{}
@@ -44,7 +62,7 @@ func newGameWindow(width, height, scale int, title string) *GameWindow {
 		Width:       width,
 		Height:      height,
 		Scale:       scale,
-		Keys:     []ui.Key{},
+		PressedKeys: newKeys(),
 		MouseX:      -1,
 		MouseY:      -1,
 		IsClosed:    false,
@@ -52,7 +70,6 @@ func newGameWindow(width, height, scale int, title string) *GameWindow {
 	return &GameWindow{
 		state:     state,
 		title:     title,
-		pressedKeys: map[ui.Key]struct{}{},
 		funcs:     make(chan func(*opengl.Context)),
 		funcsDone: make(chan struct{}),
 		closed:    make(chan struct{}),
@@ -145,16 +162,10 @@ func ebiten_KeyDown(nativeWindow C.EbitenGameWindowPtr, keyCode int) {
 		return
 	}
 	w := windows[nativeWindow]
-	w.pressedKeys[key] = struct{}{}
-
-	keys := []ui.Key{}
-	for key, _ := range w.pressedKeys {
-		keys = append(keys, key)
-	}
 
 	w.Lock()
 	defer w.Unlock()
-	w.state.Keys = keys
+	w.state.PressedKeys.(Keys).add(key)
 }
 
 //export ebiten_KeyUp
@@ -164,16 +175,10 @@ func ebiten_KeyUp(nativeWindow C.EbitenGameWindowPtr, keyCode int) {
 		return
 	}
 	w := windows[nativeWindow]
-	delete(w.pressedKeys, key)
-
-	keys := []ui.Key{}
-	for key, _ := range w.pressedKeys {
-		keys = append(keys, key)
-	}
 
 	w.Lock()
 	defer w.Unlock()
-	w.state.Keys = keys
+	w.state.PressedKeys.(Keys).remove(key)
 }
 
 //export ebiten_MouseStateUpdated

ui/ui.go

@@ -22,11 +22,15 @@ type UI interface {
 	Terminate()
 }
 
+type Keys interface {
+	Includes(key Key) bool
+}
+
 type CanvasState struct {
 	Width       int
 	Height      int
 	Scale       int
-	Keys     []Key
+	PressedKeys Keys
 	MouseX      int
 	MouseY      int
 	IsClosed    bool