On Oct 20, 2008, at 6:23 AM, Ricky Sharp wrote:
This is actually quite difficult. I can send you details later
today. In my case, I needed accessibility and mimic the Aqua radio
buttons in terms of all their behaviors.
I ended up subclassing NSMatrix and NSActionCell. I could not get a
subclass of NSButtonCell in an NSMatrix to work completely.
I originally attempted to create a custom radio button control around
Nov 2004. You can search the archives for a thread back then titled
"Tracking behavior of cells in NSMatrix".
There seemed to be some special code going on between NSMatrix and
NSButtonCell that I could not duplicate. There are probably many
private methods at work.
Anyhow, my final solution was to do this:
subclass NSMatrix (this will be your "radio button group")
In that subclass, I implemented mouseDown: to do the following:
- call convertPoint:fromView: to get the view's point that was clicked
- call getRow:column:forPoint: to see if point clicked any cells
- if it did, call cellAtRow:column: to get the cell instance.
Then it got tricky...
if the matrix didn't yet have a keyCell, I set the key cell to the one
just clicked
I then fell into a local tracking loop by sending
trackMouse:inRect:ofView:untilMouseUp: to the cell.
If the mouse was released inside the bounds of the cell being tracked...
- set the state of the original cell to NSOffsate and set the state of
the tracked cell to NSOnState.
else...
- set the key cell to the original key cell before tracking was started.
Then, in a subclass of NSActionCell, I implemented:
trackMouse:inRect:ofView:untilMouseUp:
I maintained a flag in that class so I could query if the mouse was
released in its bounds or not (used by the matrix's mouseDown: code
above).
The subclass of NSActionCell of course handled all custom drawing too
depending on state.
This implementation (plus more code not shown) gave me:
- custom drawing
- exact Aqua behaviors when dealing with mouse or full keyboard access
- bindings integration (e.g. selectedRadioTag)
- accessibility hooks
___________________________________________________________
Ricky A. Sharp mailto:[EMAIL PROTECTED]
Instant Interactive(tm) http://www.instantinteractive.com
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