Re: Questions about NSPopupButtonCell and NSBrowser
Re: Questions about NSPopupButtonCell and NSBrowser
- Subject: Re: Questions about NSPopupButtonCell and NSBrowser
- From: Graham Cox <email@hidden>
- Date: Thu, 04 Jun 2015 09:39:50 +1000
> On 4 Jun 2015, at 7:29 am, Frank D. Engel, Jr. <email@hidden> wrote:
>
> Now what I am hoping is the simpler one:
>
> I have a custom subclass of NSTextFieldCell which I am using to show an icon in an NSBrowser. The icon image is being generated dynamically by a method in my subclass and I want it to change more or less in "real time" as a bound value changes. I have that almost working, but the one problem is that it doesn't refresh when I need it to.
>
> Is there some way I can "force" a browser cell to redraw its image, short of redrawing the entire browser or window? The text isn't changing, just the icon, but I'd settle for redrawing the cell...
>
> I've tried a number of things to get this working and it seems I keep coming up short.
NSBrowser normally uses NSBrowserCell to draw its content. That class has a -setImage: method which presumably knows how to mark the correct part of its host view as needing display.
If you have to use a different cell class, then you’ll need to figure out how to do the same. The cell is part of a 1-column NSMatrix which has methods to return the rect occupied by a given row, so given that you can call -setNeedsDisplayInRect: on the matrix itself. Useful methods there are -[NSMatrix getRow:column:ofCell:] and -[NSMatrix cellFrameAtRow:column:];
hth,
—Graham
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