remove demo game

ui.widget.go

@@ -0,0 +1,51 @@
+package pncdsl
+
+import "github.com/hajimehoshi/ebiten/v2"
+
+// Widget is the minimal surface a HUD element must implement to participate
+// in the per-frame loop. The library ships several built-in widgets
+// (VerbBar, InventoryBar, DialogBox, etc.) and the domain can register
+// arbitrary new ones — chat panels, minimaps, hotbars — as long as they
+// satisfy this interface.
+//
+// Lifecycle:
+//   - Tick runs once per frame in REVERSE registration order so the
+//     top-most widget gets a chance to consume input first via
+//     ctx.Game.Input.ConsumeLeft / ConsumeRight.
+//   - Draw runs once per frame in REGISTRATION order, so widgets
+//     registered later are painted on top.
+type Widget interface {
+	Named
+	Tick(ctx *UICtx)
+	Draw(dst *ebiten.Image, ctx *UICtx)
+}
+
+// UICtx is the per-tick context handed to widgets. Game is the root
+// aggregate; DT is seconds since the previous frame.
+type UICtx struct {
+	Game *Game
+	DT   float64
+}
+
+// MouseButton identifies which mouse button a widget binds to (e.g. the
+// RadialVerbs widget uses MouseButtonRight by default).
+type MouseButton int
+
+const (
+	MouseButtonLeft MouseButton = iota
+	MouseButtonRight
+)
+
+// Size is a {Width, Height} pair in screen-space pixels.
+type Size struct {
+	W, H int
+}
+
+// Align controls horizontal text alignment for widgets that draw a single line.
+type Align int
+
+const (
+	AlignLeft Align = iota
+	AlignCenter
+	AlignRight
+)