Trouble with dragging and file promises
Trouble with dragging and file promises
- Subject: Trouble with dragging and file promises
- From: Dave DeLong <email@hidden>
- Date: Thu, 07 Jan 2010 13:43:00 -0700
Hi everyone,
I'm trying to figure out how file promises work, and I've hit an impasse. Here's what I've got set up:
I have a simple item-based NSBrowser that's displaying my hard drive hierarchy. When I drag something out of the browser, I'd like to create a simple text file at the drop location that contains the full path of the item I'm dragging. Pretty simple; I'm just trying to figure out how this all works before doing more complex stuff.
In my NSBrowser delegate, I'm doing a simple:
- (BOOL)browser:(NSBrowser *)browser writeRowsWithIndexes:(NSIndexSet *)rowIndexes inColumn:(NSInteger)column toPasteboard:(NSPasteboard *)pasteboard {
[pasteboard declareTypes:[NSArray arrayWithObject:(NSString *)kPasteboardTypeFileURLPromise] owner:self];
[pasteboard setPropertyList:[NSArray arrayWithObject:@"txt"] forType:(NSString *)kPasteboardTypeFileURLPromise];
return YES;
}
(The idea of including the file extension came from the DragNDropOutlineView source)
From there, I'm implementing my "browser:namesOfPromisedFilesDroppedAtDestination:forDraggedRowsWithIndexes:inColumn:" method, but it's never getting called. When I drag an item from my browser, it drags and I get the green "+" icon when I drag to the desktop, but when I release nothing happens. I've tried setting the pasteboard owner to the browser (instead of the browser datasource), I've tried overriding respondsToSelector: to figure out if I'm supposed to be implementing anything else, I've been searching CocoaBuilder, StackOverflow, CocoaDev, Google, sample code, etc, but I can't find anything to clarify what's supposed to be going on. Most of the stuff I'm finding is from the pre-Leopard years, or references stuff like "dragImage:at:offset:event:pasteboard:source:slideBack:" (which would seem to imply I have to subclass NSBrowser to get this to work?!). The Drag and Drop programming topics guide in the documentation hasn't been updated since 2006, and again only talks about the "dragImage:at:offset:event:pasteboard:source:slideBack:" approach.
In a nutshell, what am I doing wrong, and where is the clear documentation?
Thanks!
Dave DeLongAttachment:
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