Re: NSTableView NSTrackingArea and mouse clicks

FROM : kvictor@pobox.com
DATE : Fri Jul 25 22:19:45 2008

corbin,
thanx for the reply. i was pretty sure it wasn't my drawing code and
after some more "playing around" i'm convinced of that.

i've narrowed down my problem (and i can reproduce it in the
PhotoSearch demo -- see below).

the -[NSCell setHighlighted:] message does NOT get sent to a cell if
a click occurs inside an NSTrackingArea for the cell/view.

to see this problem in the PhotoSearch demo app, add the following 3
lines to the bottom of -[ImagePreviewCell
addTrackingAreasForView:inRect:withUserInfo:mouseLocation:] :

   cellFrame.size.width /=  2;
   NSTrackingArea *area2 = [[NSTrackingArea alloc]
initWithRect:cellFrame options:options owner:controlView
userInfo:userInfo];
   [controlView addTrackingArea:area2];
   [area2 release];

also add an override of setHighlighted as follows:

- (void) setHighlighted: (BOOL) value
{
NSLog(@"%s:  %d", __func__, value);

   [super setHighlighted: value];
}

you can verify that the new tracking area is working because if you
move the mouse into it, the info button changes. but if u click in
this second tracking area, your override of setHighlighted does NOT
get called.

offhand, i would say that this doesn't sound like a bug in
PhotoSearch, but rather a bug in the toolbox. would you agree? if you
think this is a bug in PhotoSearch, can you suggest a solution? if
this is in fact a toolbox bug, let me know and i'll report in radar;
and also, could you suggest a work-around?

thanx,
ken




At 7:44 AM -0700 7/25/08, Corbin Dunn wrote:
>On Jul 24, 2008, at 6:16 PM, <email_removed> wrote:
>

>>i have an NSTableView that uses a data source (no bindings, but i
>>don't think this is relevant). one column uses a custom cell that
>>is actually a subclass of NSTokenFieldCell (but i don't think this
>>is relevant either). i draw this cell differently depending on
>>whether or not the row it is in is the table's selected row. (and i
>>only allow one row at a time to be selected.)
>>
>>if i don't use any NSTrackingAreas, everything works as i want/expect.
>>
>>however, if i set up some tracking rects for my custom cell, then
>>things don't work properly. i am using the techniques from the
>>sample PhotoSearch app. by "don't work properly," what i mean is
>>that if i select a row by clicking in one of the NSTrackingAreas,
>>the cell draws as if the row isn't selected. if i don't click
>>inside one of the tracking rects, but click elsewhere in the row,
>>then my custom cell draws properly, ie in its highlighted state.
>>
>>since this is my first use of NSTrackingArea, i wouldn't be
>>surprised if its something i'm doing. are there known interactions
>>between NSTrackingArea a clicks in the tracking area? can anyone
>>suggest how i can proceed?

>
>No; none --- it is probably something wrong with your cell drawing
>code. Can you post it here? I'll take a look at it.
>
>corbin (I wrote that demo -- note, I think there are a few bugs in
>the tracking area code of the demo that I need to fix up, but this
>isn't one of them)