rick@jessica.Stanford.EDU (Rick Wong) (08/10/90)
I'm writing a custom window definition proc in which I'd like to have another widget (like the close box and zoom box) in the title bar. Has Apple defined any protocol for assigning values to custom message selectors and window part codes? Is it safe, for example, to use values >= 1000? Also, I noticed that the part code returned by FindWindow is not equal to the value returned by the WDEF's hit routine. Rather, FindWindow adds 2 to it, provided it is >= 2. (This maps wInDrag -> inDrag, wInGrow -> inGrow, etc.) Consequently, if my hit routine returns 1000, FindWindow returns 1002. Is this behavior etched in ROM forever and ever, never to be changed even if Apple realizes how dumb it is? Finally, if I pass the custom part code returned by FindWindow back to TrackBox, is it safe to assume that it will call the WDEF's draw routine with "param" equal to the part code mapped back to the original value that the hit routine returned (thus indicating that I should xor the widget)? It certainly seems TrackBox was designed to handle custom widgets (note that it isn't named "TrackZoomBox"), and this is indeed how it behaves currently. As always, many thanks for any Information. Rick Wong rick@jessica.stanford.edu