[news.eclipse.platform] Re: How to get default font in Table

[Tom Schindl <tom.schindl@xxxxxxxxxxxxxxx>]

Ed,

Would you mind filing a bug against platform/ui and CC me to see whether 
we have ideas to provide something in 3.4?

Ed Merks schrieb:
> Tom,
>
> It's easy, though not self evident.  I suppose it's documented somewhere 
> in that documentation I never read.  :-)
>
> It also seems a little dangerous to use a global registry for a 
> particular column viewer.  You'd certainly need to be careful to create 

Certainly right. I most of the time work only with the standard fonts 
and set them up when my plugin-starts using the global-registry but the 
key is prefixed with my own plugin-id :-)

> a key that's unique to this particular column viewer wouldn't you?  
> (Especially for code that might be reused a lot and have different fonts 
> in different places.)  And then I'm not certain if this registry gets 
> cleaned up when my viewer is deleted, so it might accumulate 
> viewer-specific garbage.

No. A registry is cleared only when the display is closed. You can clear 
viewer resources in IBaseLabelProvider#dispose() which is called when a 
Viewer is disposed or in 3.3 the ViewerColumn it is attached to.

> I'll bet there isn't a single IFontLabelProvider implementation that 
> doesn't need to keep track of the default font for what it's viewing, so 
> I would have hoped for something more "built-in".  One problem I see in 
> this regard is that while an IContentProvider has an inputChanged so it 
> knows the viewer that's using it, the ILabelProvider has no such 
> mechanism (that I know of).

Well the new JFace-API for Viewers knows exactly for which Viewer it's 
working because it gets passes a ViewerCell which holds all informations 
about the control its working for see CellLabelProvider#update(ViewerCell)

Tom