


One issue which I haven't yet decided how to handle is transitions. Should I allow multiple transitions to be moved next to each other on the timeline? What would that mean? I don't think there's a use case for multiple transitions in between two clips. If I'm not to allow multiple transitions, then I have to think of a way to prevent them from stacking against each other, which could get hairy.
Currently I have a SimpleTimeline which derives from Canvas(). This in turn uses a more general HList(), which I had hoped to make as general as possible. However, I think my goal of having a generic, re-orderable list class is not going to work. There is too much application-specific behavior in the timeline. Tomorrow, I'm going copy the list code directly into the SimpleTimeline class, which already implements the re-orderable portion of the list anyways.
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