Many moons ago I built a UI using a fairly basic UI toolkit (X/Motif) so I had to handle all the state of the UI menus and dialogs along with the status of the

Many moons ago I built a UI using a fairly basic UI toolkit (X/Motif) so I had to handle all the state of the UI menus and dialogs along with the status of the current file (new/saved/unsaved/etc). In the end when it was all working I thought to myself that I should have used a state machine.