NSOutlineView Drag-n-Drop - objective-c

Question

In my application, NSOutlineView used as below,
1 -- Using CustomOutlineView because i want to control NSOutlineView Background,
2 -- Using CustomeCell, becuase i need to have customize Cell
Header File : MyListView.h
/*
MyUICustomView is the Subclass from NSView and this is i need to have
for some other my application purpose
*/
#interface MyListView : MyUICustomView<NSOutlineViewDataSource>
{
// MyCustomOutlineview because, i need to override DrawRect Method to have
// customized background
MyCustomOutlineView *pMyOutlineView;
}
#property(nonatomic,retain)MyCustomOutlineView *pMyOutlineView;
and also i should be able to drag-n-drop within Outline view,
for having drag-n-drop i have done following,
-(void)InitOutlineView{
// Creating outline view
NSRect scrollFrame = [self bounds];
NSScrollView* scrollView = [[[NSScrollView alloc] initWithFrame:scrollFrame] autorelease];
[scrollView setBorderType:NSNoBorder];
[scrollView setHasVerticalScroller:YES];
[scrollView setHasHorizontalScroller:NO];
[scrollView setAutohidesScrollers:YES];
[scrollView setDrawsBackground: NO];
NSRect clipViewBounds = [[scrollView contentView] bounds];
pMyOutlineView = [[[MyCustomOutlineView alloc] initWithFrame:clipViewBounds] autorelease];
NSTableColumn* firstColumn = [[[NSTableColumn alloc] initWithIdentifier:#"firstColumn"] autorelease];
#ifdef ENABLE_CUSTOM_CELL
// Becuase cell should have Image, Header Info and brief detail in small font,
// so i need to have custom cell
ImageTextCell *pCell = [[ImageTextCell alloc]init];
[firstColumn setDataCell:pCell];
// SO i can fill the data
[pCell setDataDelegate:self];
# endif
[pMyOutlineView setDataSource:self];
/* This is to tell MyCustomOutlineView to handle the context menu */
[pMyOutlineView setDataDelegate:self];
[scrollView setDocumentView:pCTOutlineView];
[pMyOutlineView addTableColumn:firstColumn];
[pMyOutlineView registerForDraggedTypes:
[NSArray arrayWithObjects:OutlinePrivateTableViewDataType,nil]];
[pMyOutlineView setDraggingSourceOperationMask:NSDragOperationEvery forLocal:YES];**
}
and to Support drag-n-drop Implemented following method
- (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pboard{
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:items];
[pboard declareTypes:[NSArray arrayWithObject:OutlinePrivateTableViewDataType] owner:self];
[pboard setData:data forType:OutlinePrivateTableViewDataType];
return YES;
}
- (NSDragOperation)outlineView:(NSOutlineView *)outlineView validateDrop:(id < NSDraggingInfo >)info proposedItem:(id)item proposedChildIndex:(NSInteger)index{
// Add code here to validate the drop
NSLog(#"validate Drop");
return NSDragOperationEvery;
}
- (BOOL)outlineView:(NSOutlineView *)outlineView acceptDrop:(id < NSDraggingInfo >)info item:(id)item childIndex:(NSInteger)index{
NSLog(#"validate Drop");
}
but still when i try to drag the row of NSOutlineView nothing is happening, even i tried to debug via NSLog but i couldn't see any log from above function,
Am i missing any important method ?
to support Drag-n-drop

Answer 1

Based on your code, it looks like you're not returning anything for the ...writeItems... method. This method is supposed to return a BOOL (whether the items were successfully written or you're denying the drag). Returning nothing should be giving you a compiler warning ...

Answer 2

HI,
FInally got able to rid of this,
The problem is
[firstColumn setWidth:25];
So drag was working only upto 25 pixel form the left, and i commented this, then its working time, but strange to see, my outline view has only one column , for drawing, its not checking the restriction but for drag-n-drop its checking,
Thanks Joshua