Re: - outlineView:willDisplayCell:forTableColumn:item: and selected item
Re: - outlineView:willDisplayCell:forTableColumn:item: and selected item
- Subject: Re: - outlineView:willDisplayCell:forTableColumn:item: and selected item
- From: "Ken Ferry" <email@hidden>
- Date: Tue, 26 Feb 2008 14:43:16 -0800
No, you'd draw whatever you feel like drawing, possibly after
processing it. You'd use methods from NSStringDrawing. It's also
sometimes convenient to delegate drawing to what you think of as a
subcell - I'd try to do that before pulling tricks like temporarily
modifying self across a call to a superclass method.
This would opt you out of NSCell's built-in processing, so you'd at
least want to limit it to older OSes, and may have other bad aspects
to it. I'm not really advocating this path, this is more or less just
an FYI as to how the framework works.
-Ken
On Tue, Feb 26, 2008 at 1:26 PM, John Stiles <email@hidden> wrote:
> What would I do in my override? Temporarily set the text color, call
> super, and then revert it back?
>
>
>
>
> Ken Ferry wrote:
> > The way NSCell deals with this is that the white color is never part
> > of the value data itself, it's thought of as a draw-time visual
> > effect.
> >
> > That is, rather than calling setTextColor, you could override
> > -drawInteriorWithFrame:inView:.
> >
> > -Ken
> >
> > On Tue, Feb 26, 2008 at 11:35 AM, John Stiles <email@hidden> wrote:
> >
> >> Actually, for what it's worth, I did just hit one snag. If you attempt to
> >> edit the cell, the field editor inherits the white color! This makes it
> >> pretty difficult to see what you're doing ;)
> >>
> >> I have a custom field editor anyway and have lots of control over how the
> >> edit process gets started, so it was no problem to force the field editor to
> >> use the actual item color, but I figured this was worth mentioning, for the
> >> archives if nothing else.
> >>
> >>
> >>
> >>
> >> John Stiles wrote:
> >> Six of one and a half dozen of the other? :)
> >> Anyway, it looks like this does the trick:
> >> ([cell isHighlighted] && [[outlineView window] isKeyWindow] &&
> >> [[outlineView window] firstResponder] == outlineView)
> >>
> >> Not quite as clean and nice as "backgroundStyle" but it will have to do for
> >> now :)
> >>
> >> Ken Ferry wrote:
> >> Also, I'd be pretty surprised if this actually showed up in perf
> >> profiling. Do you mean 'heavyweight', or annoying? :-)
> >>
> >>
> >>
> >> > but it seems a lot more heavyweight. You have to do:
> >> >
> >> > [[outlineView selectedRowIndexes] containsIndex:[outlineView
> >> rowForItem:item]]
> >>
> >> -Ken
> >>
> >> On Mon, Feb 25, 2008 at 6:26 PM, Ken Ferry <email@hidden> wrote:
> >>
> >>
> >> The pre-leopard code isn't pretty. The AppKit relnotes give the old
> >> path while motivating the backgroundStyle API. I'm not sure if this
> >> is 100% complete..
> >>
> >> > Prior to Leopard, you may have noticed that text turns white in selected
> >> table view rows. The
> >> > mechanism that controlled this behavior, unfortunately, was arcane. The
> >> table would set the
> >> > highlight color of the cell to the alternateSelectedControlColor and set
> >> the cell to be highlighted.
> >> > The cell would then introspect its highlight color, and use white text if
> >> the color was the
> >> > alternateSelectedControlColor.
> >>
> >> You probably have a constrained case, so it may suffice to check
> >> -isHighlighted.
> >>
> >> It'd be nice if you could use the Leopard API on Leopard or later, as
> >> we might try to be a little bit more clever about when the text
> >> actually turns white. Ideally the text wouldn't turn white if the
> >> user's chosen selection color was sufficiently light. There's scope
> >> for making that work in the backgroundStyle API.
> >>
> >> -Ken
> >>
> >>
> >>
> >>
> >> On Mon, Feb 25, 2008 at 5:12 PM, John Stiles <email@hidden> wrote:
> >> > In my outline view, I'm using an NSTextFieldCell and setting the item's
> >> > color via setTextColor:.
> >> >
> >> > This works fine, but for some colors, it's almost impossible to see when
> >> > the item is selected. I'd like to always make the text white if the item
> >> > is selected.
> >> >
> >> > In Leopard, I know I can use [cell backgroundStyle] ==
> >> > NSBackgroundStyleDark to check this, but I was wondering if there is any
> >> > easy check for Tiger and below. I can actually go through the
> >> > machinations of asking the outline view if the item is selected, but it
> >> > seems a lot more heavyweight. You have to do:
> >> >
> >> > [[outlineView selectedRowIndexes] containsIndex:[outlineView
> >> > rowForItem:item]]
> >> >
> >> > And I'm not sure just how fast that is, but it can't be as fast as just
> >> > asking the cell "are you selected" :)
> >> >
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> >>
> >>
> >>
>
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