Implement the main menu for the ordoor binary

In this commit, we also remove code that doesn't properly belong in
view-menu

internal/ui/interface.go

@@ -20,6 +20,7 @@ import (
 // mind. The interface transparently scales them all to the current screen size
 // to compensate.
 type Interface struct {
+	Name    string
 	menu    *assetstore.Menu
 	static  []*assetstore.Sprite // Static elements in the interface
 	ticks   int
@@ -28,6 +29,8 @@ type Interface struct {
 
 func NewInterface(menu *assetstore.Menu) (*Interface, error) {
 	iface := &Interface{
+		Name: menu.Name,
+
 		menu: menu,
 	}
 
@@ -59,6 +62,10 @@ func (i *Interface) Update(screenX, screenY int) error {
 
 	// Iterate through all widgets, update mouse state
 	for _, widget := range i.widgets {
+		if widget.disabled {
+			continue // No activity for disabled widgets
+		}
+
 		mouseIsOver := mousePos.In(widget.Bounds)
 		widget.hovering(mouseIsOver)
 		widget.mouseButton(mouseIsOver && ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft))
@@ -188,11 +195,17 @@ func (i *Interface) widgetFromRecord(record *menus.Record) (*Widget, error) {
 		}
 		widget.hoverAnimation = hovers
 
-		sprite, err := i.menu.Sprite(record.Share + 1)
+		pressed, err := i.menu.Sprite(record.Share + 1)
 		if err != nil {
 			return nil, err
 		}
-		widget.mouseButtonDownImage = sprite.Image
+		widget.mouseButtonDownImage = pressed.Image
+
+		disabled, err := i.menu.Sprite(record.Share + 2)
+		if err != nil {
+			return nil, err
+		}
+		widget.disabledImage = disabled.Image
 	}
 
 	return widget, nil