widget manager refact

inc/widget.scene_nav.go

@@ -0,0 +1,53 @@
+package inc
+
+import (
+	inkwell "git.teletypegames.org/engines/inkwell"
+	"github.com/hajimehoshi/ebiten/v2"
+	"github.com/hajimehoshi/ebiten/v2/inpututil"
+)
+
+func init() {
+	WidgetManager.Register(&sceneNav{
+		Name: "scene_nav",
+	})
+}
+
+type sceneNav struct {
+	Name string
+}
+
+func (n *sceneNav) GetName() string                            { return n.Name }
+func (n *sceneNav) Layer() inkwell.Layer                       { return inkwell.LayerScene }
+func (n *sceneNav) Draw(dst *ebiten.Image, ctx *inkwell.UICtx) {}
+
+func (n *sceneNav) Tick(ctx *inkwell.UICtx) {
+	if !World.HUDVisible() || World.Paused() {
+		return
+	}
+	step := 0
+
+	switch {
+	case inpututil.IsKeyJustPressed(ebiten.KeyArrowRight):
+		step = 1
+	case inpututil.IsKeyJustPressed(ebiten.KeyArrowLeft):
+		step = -1
+	default:
+		return
+	}
+	if next := n.neighbour(ctx.Game, step); next != "" {
+		World.Do(inkwell.GoTo(next))
+	}
+}
+
+func (n *sceneNav) neighbour(g *inkwell.Game, step int) string {
+	deck := g.SceneManager.Names()
+	if len(deck) < 2 {
+		return ""
+	}
+	for i, name := range deck {
+		if name == World.G.CurrentScene() {
+			return deck[((i+step)%len(deck)+len(deck))%len(deck)]
+		}
+	}
+	return deck[0]
+}