Icon parameters in *.desktop files

[stanley peng]

James Richard Tyrer 提到:

> I believe that I mentioned this before, but it was suggested to me 
> that I propose this as a change to the standard.
>
> I originally suggested this as a solution to the issue of generic vs. 
> specific icons, but it might have other uses as well.  Specifically, 
> it might be useful with icon themes.
>
> My suggestion is that the "Icon" key be allowed to have a list of 
> icons rather than just one.  For example:
>
>     Icon=kate,editor,text-editor
>
>     Icon=svg,vectorgfx,image
>
> The icon loader would search for the icons in order, first in the 
> user's selected theme, then in any inherited themes, and finally in 
> HiColor. So, if a specific icon existed in that theme, it would be 
> used.  If not, the icon loader would look for the listed more generic 
> icons.


wow, good~, I prefer to it.

>
> The first question I have is what happens if the user selects an icon 
> with a GUI dialog.  Obviously, the whole line is going to be 
> overwritten and the information about the generic icons would be 
> lost.  This appears to be satisfactory -- if the user selects an icon, 
> it is going to be one  which exists and there is no need for 
> alternatives.
>
> But, if this is considered to be a problem, it would also be possible 
> to add an additional key.  For example:
>
>     Icon=kate
>     GenericIcons=editor,text-editor
>
>     Icon=svg
>     GenericIcons=vectorgfx,image
>
> then if the user changed the icon with a GUI dialog, the list of other 
> possible substitute icons wouldn't be lost.  The icon loader would 
> first look for the icon specified by "Icon" and if not found would 
> look for the icons in the "GenericIcons" list.  This might also be 
> better for backward compatibility.
>
> Either way, this also has advantages when running an application on 
> another desktop.  In the first example, if Kate (a KDE application) is 
> run on GNOME, then if there is no "kate" icon because GNOME doesn't 
> use the KDE default theme, it would use the GNOME HiColor icon 
> "text-editor" icon.
>