Allow dialogues to be hidden or shown

To do this, MENU and SUBMENU are split into two types (at last), and
a Widget type is introduced. This should allow lots of code to be
removed at some point.

internal/ui/inventory_select.go

@@ -4,10 +4,6 @@ import (
 	"code.ur.gs/lupine/ordoor/internal/menus"
 )
 
-func init() {
-	registerBuilder(menus.TypeInventorySelect, ownedByMenu)
-}
-
 // An inventory select is a sort of radio button. If 2 share the same menu,
 // selecting one deselects the other. Otherwise, they act like checkboxes.
 //
@@ -20,33 +16,18 @@ type inventorySelect struct {
 }
 
 // Called from the menu, which fills "others" for us
-func registerInventorySelect(d *Driver, r *menus.Record) (*inventorySelect, error) {
-	sprites, err := d.menu.Sprites(r.ObjectIdx, r.Share, 3) // unchecked, checked, disabled
+func (d *Driver) buildInventorySelect(p *menus.Properties) (*inventorySelect, *Widget, error) {
+	c, widget, err := d.buildCheckbox(p)
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 
-	element := &inventorySelect{
-		checkbox: checkbox{
-			button: button{
-				path:      r.Path(),
-				baseSpr:   sprites[0], // unchecked
-				clickSpr:  sprites[1], // checked
-				frozenSpr: sprites[2], // disabled
-				hoverImpl: hoverImpl{text: r.Text},
-			},
+	// In an inventorySelect, the frozen and click sprites are reversed
+	c.clickSpr, c.frozenSpr = c.frozenSpr, c.clickSpr
 
-			valueImpl: valueImpl{str: "0"},
-		},
-	}
+	element := &inventorySelect{checkbox: *c}
 
-	d.clickables = append(d.clickables, element)
-	d.freezables = append(d.freezables, element)
-	d.hoverables = append(d.hoverables, element)
-	d.paintables = append(d.paintables, element)
-	d.valueables = append(d.valueables, element)
-
-	return element, nil
+	return element, widget, nil
 }
 
 func (i *inventorySelect) registerMouseClick() {