Re: NSCell subclasses

FROM : Timothy Ritchey
DATE : Wed Jan 29 19:51:34 2003

Just wanted to point out you are using %d in your log - that is for
integers. coordinates are floats, so if you want to see the right
numbers, use %f.

- tim

On Wednesday, January 29, 2003, at 10:03  PM, Mark Trombino wrote:

> Hello,
>
> I'm trying to subclass NSCell and I've ran into a bit of a problem
> when trying to draw the cells.  Essentially, nothing gets drawn!  My
> cells are used with an NSMatrix subclass.  I'm overriding
> drawInteriorWithFrame:inView: but I get crazy frame values whenever
> this method gets called.  My implementation:
>
> - (void)drawInteriorWithFrame:(NSRect)cellFrame inView:(NSView
> *)controlView
> {
>    if([[self path] length])
>    {
>        NSImage *displayImage = [self _displayImageForPath:[self path]
> withSize:cellFrame.size];
>
>        if(inDragLoop)
>            [displayImage compositeToPoint:cellFrame.origin
> operation:NSCompositeSourceOver fraction:.5];
>        else
>            [displayImage compositeToPoint:cellFrame.origin
> operation:NSCompositeSourceOver];
>
>    }
>    NSLog(@"%@: drawInteriorWithFrame:(%d, %d)", self,
> cellFrame.origin.x, cellFrame.origin.y);
> }
>
>
> This generates the following for a 3 x 3 matrix:
>
> 2003-01-29 10:50:17.178 DragTest[16407] <MTFileMatrixCell: 0xc2990>:
> drawInteriorWithFrame:(0, 0)
> 2003-01-29 10:50:17.179 DragTest[16407] <MTFileMatrixCell: 0xc2a50>:
> drawInteriorWithFrame:(1079279616, 0)
> 2003-01-29 10:50:17.179 DragTest[16407] <MTFileMatrixCell: 0x23e450>:
> drawInteriorWithFrame:(1080328192, 0)
> 2003-01-29 10:50:17.180 DragTest[16407] <MTFileMatrixCell: 0x23e4f0>:
> drawInteriorWithFrame:(0, 0)
> 2003-01-29 10:50:17.181 DragTest[16407] <MTFileMatrixCell: 0x23e590>:
> drawInteriorWithFrame:(1079279616, 0)
> 2003-01-29 10:50:17.181 DragTest[16407] <MTFileMatrixCell: 0x23e660>:
> drawInteriorWithFrame:(1080328192, 0)
> 2003-01-29 10:50:17.181 DragTest[16407] <MTFileMatrixCell: 0x23e700>:
> drawInteriorWithFrame:(0, 0)
> 2003-01-29 10:50:17.182 DragTest[16407] <MTFileMatrixCell: 0x23e7a0>:
> drawInteriorWithFrame:(1079279616, 0)
> 2003-01-29 10:50:17.182 DragTest[16407] <MTFileMatrixCell: 0x23e840>:
> drawInteriorWithFrame:(1080328192, 0)
>
> I guess what I'm wondering is whether or not I have to do some sort of
> conversion on cellFrame before using it?  Is it supposed to be in the
> NSControl's coordinate system?  To be clear, I'm not getting sent my
> bounds, but the frame of my cell in the NSControl's coordinate system,
> yes?
>
> Can cells know their frame other than by the cellFrame parameter?  I
> don't see a frame instance variable in the header file for NSCell so
> I'm guessing not.  I imagine that cells probably shouldn't need to
> know their frame...
>
> Really, all I want is something similar to a NSButtonCell that I can
> drag and drop file images to and from.  Perhaps I should subclass that
> rather than NSActionCell?
>
> This is a bit daunting to me, subclassing NSCell and trying to get it
> to work with NSMatrix.  If anyone has any pointers or good places for
> info on the subject please let me know ;-)
>
> Thank you!
>
> Mark Trombino
> <email_removed>
>
> _______________________________________________
> MacOSX-dev mailing list
> <email_removed>
> http://www.omnigroup.com/mailman/listinfo/macosx-dev
>