You need to subclass NSMatrix, and implement the following selectors.
Note, this code is taken from a matrix that is used within an
NSBrowser, but there is no reason this shouldn't work that I know of.
Let me know if this works for you.
Cheers,
tim
- (void)mouseDown:(NSEvent *)event
{
// need to override this because NSMatrix eats drag events
int row, col;
if ([self getRow: &row column: &col
forPoint:[self convertPoint:[event locationInWindow]
fromView: nil]]) {
[self selectCellAtRow: row column: col];
[self sendAction];
// this is used to deal with NSBrowser issues
[[self window] makeFirstResponder:self];
} else {
[super mouseDown: event];
}
}
- (void)mouseDragged:(NSEvent *)event
{
NSPasteboard *pb = [NSPasteboard pasteboardWithName: NSDragPboard];
NSPoint dragPoint;
int row, col;
NSImage *image = [self imageForString:@"SOME STRING"];
[self getRow:&row column:&col
forPoint: [self convertPoint:[event locationInWindow]
fromView:nil]];
dragPoint = [self convertPoint: [event locationInWindow]
fromView:nil];
dragPoint.x -= ([image size].width * 0.5);
dragPoint.y += ([image size].height * 0.5);
[pb declareTypes: [NSArray arrayWithObjects: NSStringPboardType,
nil]
owner: self];
[pb setString:@"SOME STRING" forType:NSStringPboardType];
[self dragImage: image
at:dragPoint
offset: NSZeroSize
event: event
pasteboard: pb
source: self
slideBack: YES];
}
- (unsigned int)draggingSourceOperationMaskForLocal:(BOOL)isLocal
{
return NSDragOperationCopy;
}
- (NSImage *) imageForString:(NSString*)aString {
NSImage *image = nil;
NSBitmapImageRep *bits = nil;
NSRect textFrame;
NSCell *cell = [[NSCell alloc] initTextCell:aString];
textFrame.size = [cell cellSize];
textFrame.origin = NSZeroPoint;
image = [[NSImage alloc] initWithSize: textFrame.size];
[image setBackgroundColor:[NSColor blueColor]];
[image lockFocus];
[cell drawInteriorWithFrame: textFrame inView: [NSView focusView]];
bits = [[NSBitmapImageRep alloc] initWithFocusedViewRect:
textFrame];
[image unlockFocus];
[bits release];
return [image autorelease];
}
On Dec 15, 2003, at 1:33 AM, Lee Morgan wrote:
> Hi all, I'm working on a thumbnail matrix using a (you guessed it)
> NSMatrix. I've got the matrix working fine with NSImageCell and now
> I'm wanting to add in drag and drop support to allow the user to
> rearrange the contents of the matrix. While I've used drag and drop
> support in a NSTableView (which was nice and simple mind you) I don't
> see any such easy way to add in the support to my NSMatrix. The code I
> used in the table view (such as
> -(BOOL)tableView:(NSTableView*)inTableView writeRows:(NSArray*)inRows
> toPasteboard:(NSPasteboard*)inPasteboard) doesn't seem to exist in any
> form for a matrix.
> Does NSMatrix not support drag and drop like a table view?
> And does anyone know where I can find some sample code for handling
> drag and drop within a matrix and from a matrix to a table view?
>
> Thanks,
> Lee Morgan
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