gizmo: add Disabled

Gizmo.go

@@ -67,6 +67,7 @@ type GizmoWidget struct {
 	view       *ViewMatrix
 	projection *ProjectionMatrix
 	id         ID
+	disabled   bool
 }
 
 // Gizmo creates a new GizmoWidget.
@@ -76,6 +77,7 @@ func Gizmo(view *ViewMatrix, projection *ProjectionMatrix) *GizmoWidget {
 		view:       view,
 		projection: projection,
 		id:         GenAutoID("gizmo"),
+		disabled:   false,
 	}
 }
 
@@ -85,6 +87,12 @@ func (g *GizmoWidget) ID(id ID) *GizmoWidget {
 	return g
 }
 
+// Disable disables the GizmoWidget.
+func (g *GizmoWidget) Disabled(b bool) *GizmoWidget {
+	g.disabled = b
+	return g
+}
+
 // Gizmos adds GizmoI elements to the GizmoWidget area.
 func (g *GizmoWidget) Gizmos(gizmos ...GizmoI) *GizmoWidget {
 	g.gizmos = append(g.gizmos, gizmos...)
@@ -95,6 +103,7 @@ func (g *GizmoWidget) Gizmos(gizmos ...GizmoI) *GizmoWidget {
 // Just to separate Global() and Build() methods.
 func (g *GizmoWidget) build() {
 	imguizmo.PushIDStr(string(g.id))
+	imguizmo.Enable(!g.disabled)
 
 	for _, gizmo := range g.gizmos {
 		gizmo.Gizmo(g.view, g.projection)