Hi, everyone.
Currently I am working on a project which uses the NSOutlineview heavily. I
thought the drag and drop functions are very important, so I am trying to
implement that.
However, after refer to some tutorials, I still can't make it work... My
steps are :
1. create a controller to manage the outlineview, set the controller to the
datasouce and delegate for the outlineview.
2. register the outineview with the following code in the awakeFromNib
method:
[_outlineView registerForDraggedTypes:
[NSArray arrayWithObject:MyPrivateTableViewDataType]];
3. implement the following methods:
- (BOOL)outlineView:(NSOutlineView *)ov
writeItems:(NSArray *)items
toPasteboard:(NSPasteboard *)pboard
{
draggedNodes = items;
NSlog(@"In the outlinew writeItems method!");
[pboard declareTypes:[NSArray
arrayWithObject:MyPrivateTableViewDataType] owner:self];
[pboard setData:[NSData data] forType:MyPrivateTableViewDataType];
return YES;
}
- (NSDragOperation)outlineView:(NSOutlineView*)ov
validateDrop:(id <NSDraggingInfo>)info
proposedItem:(id)item
proposedChildIndex:(NSInteger)childIndex{
NSLog(@"Return the NSDragOperation");
draggedNodes = [[[info draggingSource] dataSource] draggedNodes];
return NSDragOperationGeneric;
}
- (BOOL)outlineView:(NSOutlineView *)ov
acceptDrop:(id <NSDraggingInfo>)info
item:(id)item
childIndex:(NSInteger)childIndex
{
NSLog(@"should we return the accetpDrop?");
return YES;
}
After compiled the application and set it up, I had no chance to
successfully get anything from the console although there are so many output
statements when I drag and drop items repeatly.
Can anyone here give me some help or guidance about this issue?
Thank you very much for any help. Good luck.
--
Best regards.
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