Scenario viewpoint, Z index management, and arrow controls

internal/ui/dialogues.go

@@ -14,6 +14,10 @@ func (d *Driver) Dialogues() []string {
 	return out
 }
 
+func (d *Driver) IsInDialogue() bool {
+	return d.activeDialogue != nil
+}
+
 func (d *Driver) ShowDialogue(locator string) error {
 	for _, dialogue := range d.dialogues {
 		if dialogue.Locator == locator {

internal/ui/window.go

@@ -37,6 +37,8 @@ type Window struct {
 	MouseWheelHandler func(float64, float64)
 	MouseClickHandler func()
 
+	WhileKeyDownHandlers map[ebiten.Key]func()
+
 	// Allow the "game" to be switched out at any time
 	game Game
 
@@ -54,13 +56,16 @@ func NewWindow(game Game, title string, xRes int, yRes int) (*Window, error) {
 	ebiten.SetRunnableInBackground(true)
 
 	return &Window{
-		Title:         title,
+		Title:    title,
+		debug:    true,
+		firstRun: true,
+		game:     game,
+		xRes:     xRes,
+		yRes:     yRes,
+
+		WhileKeyDownHandlers: make(map[ebiten.Key]func()),
+
 		KeyUpHandlers: make(map[ebiten.Key]func()),
-		debug:         true,
-		firstRun:      true,
-		game:          game,
-		xRes:          xRes,
-		yRes:          yRes,
 	}, nil
 }
 
@@ -69,6 +74,10 @@ func (w *Window) OnKeyUp(key ebiten.Key, f func()) {
 	w.KeyUpHandlers[key] = f
 }
 
+func (w *Window) WhileKeyDown(key ebiten.Key, f func()) {
+	w.WhileKeyDownHandlers[key] = f
+}
+
 func (w *Window) OnMouseWheel(f func(x, y float64)) {
 	w.MouseWheelHandler = f
 }
@@ -119,7 +128,8 @@ func (w *Window) Update(screen *ebiten.Image) (outErr error) {
 		return err
 	}
 
-	// Process keys
+	// Process keys.
+	// FIXME: : should this happen before or after update?
 	// TODO: efficient set operations
 
 	for key, cb := range w.KeyUpHandlers {
@@ -128,6 +138,12 @@ func (w *Window) Update(screen *ebiten.Image) (outErr error) {
 		}
 	}
 
+	for key, cb := range w.WhileKeyDownHandlers {
+		if ebiten.IsKeyPressed(key) {
+			cb()
+		}
+	}
+
 	if w.MouseWheelHandler != nil {
 		x, y := ebiten.Wheel()
 		if x != 0 || y != 0 {