package uix import ( "errors" "git.kirsle.net/apps/doodle/pkg/shmem" ) // LinkStart initializes the Link tool. func (w *Canvas) LinkStart() { w.Tool = LinkTool w.linkFirst = nil } // LinkAdd adds an actor to be linked in the Link tool. func (w *Canvas) LinkAdd(a *Actor) error { if w.linkFirst == nil { // First click, hold onto this actor. w.linkFirst = a shmem.Flash("Doodad '%s' selected, click the next Doodad to link it to", a.Doodad.Title, ) } else { // Second click, call the OnLinkActors handler with the two actors. if w.OnLinkActors != nil { w.OnLinkActors(w.linkFirst, a) } else { return errors.New("Canvas.LinkAdd: no OnLinkActors handler is ready") } // Reset the link state. w.linkFirst = nil } return nil }