objective c - How to prevent the user from choosing some file types? -

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i want prevent user choose file types when opens nsopenpanel. can @ moment preventing him accessing files , allow want allow files except some.

nsopenpanel*openpane = [nsopenpanl openpanel]; [openpanel setallowfiletypes(nsarray*)];

but want user choose files except files not choose files out of files.

implement delegate panel. nsopenpanel inherits delegate property superclass nssavepanel.

in delegate, implement either:

- (bool) panel:(id)sender shouldenableurl:(nsurl*)url;

or:

- (bool) panel:(id)sender validateurl:(nsurl*)url error:(nserror**)outerror;

you should use first 1 if can decide whether given url should enabled , efficiently. called frequently. controls whether or not given url selectable in panel.

you should use second 1 if decision slow or requires significant cpu or i/o. called when user clicks open button. that's not best user experience. it's better prevent user making bad choice let them make bad choice , reject @ last moment.

all of said, it's kind of weird allow user select any kind of file except mp3s. there no other restriction?


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