Re: Conditional themes?

["Dr. Tilmann Bubeck" <t.bubeck@reinform.de>]

Hello!

 > You can make your theme dynamic by using percentages in your theme.txt

Yes, this is right, but sometimes not enough. If you think of a 640x480 
screen and compare its theme with a 1200x800 screen, than you see, that 
totally different themes are needed. Its not only percentage. You may 
decide to put more information into the boot screen or add more 
graphics, which is simply not possible on smaller screens.

Sure, we can offer two independent themes and switch them statically. 
But I think of a generic solution having a bundle of themes, which get 
selected automatically depending on resolution or other stuff.

 > videoinfo --show-width --set width

Your above suggestion is a third method to get the width. We now have:

1. ${gfxwidth}
    A variable getting its value automatically.

2. videoinfo --show-width --set width
    Extend videoinfo to offer "--show-width" and "--set"
    to set the value to a variable.

3. $(videoinfo --show-width)
    Extend videoinfo to offer "--show-width" and implement
    shell backticks to get that value

Its a matter of taste, so I ask you, the GRUB developers, what you like 
more. Number 3 is most generic and most useful for other similar things 
and number 1 is the most easiest to implement.

Thanks for any feedback.

Till


Am 04.10.2012 16:09, schrieb Dr. Tilmann Bubeck:
> Hello GRUB,
>
> are there plans to make theming conditional, depending on screen
> resolution? Today you have one theme, which is used for all screen
> resolutions from 320x200 up to 1600x800. When using "gfxmode=auto" you
> do not really know, which resolution you get. The theme may look ugly or
> may be completly unusable (see
> https://bugzilla.redhat.com/show_bug.cgi?id=850783).
>
> I could think of some application logic in grub.cfg, e.g.
>
> if [ "${gfxwidth}" -lt 800 ]; then
>    theme=${root}/grub2/themes/small
> else
>    theme=${root}/grub2/themes/large
> fi
>
> What do you think about that?
>
> An even more general idea would be to implement a shellish backticks
> operator $() and extend some commands to print out information (here
> "videoinfo"), like:
>
> width=$(videoinfo --show-width)
> if [ "${width}" -lt 800 ]; then
>    theme=${root}/grub2/themes/small
> else
>    theme=${root}/grub2/themes/large
> fi
>
> Any comments?
>
> Kind regards,
>   Tilmann
>
> +-------+-------------------------------------------------------------+
> |       | dr. tilmann bubeck               reinform medien- und       |
> |       |                                  informationstechnologie AG |
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> |       | handelsregister stuttgart, HRB 23001                        |
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> |       | aufsichtsrat: frank stege (vorsitz)                         |
> +-------+-------------------------------------------------------------+


-- 
+-------+-------------------------------------------------------------+
|       | dr. tilmann bubeck               reinform medien- und       |
|       |                                  informationstechnologie AG |
| rein  | fon  : +49 (711) 7 82 76-52      loeffelstr. 40             |
| form  | fax  : +49 (711) 7 82 76-46      70597 stuttgart / germany  |
|    AG | cell.: +49 (172) 8 84 29 72      fon: +49 (711) 75 86 56-10 |
|       | email: t.bubeck@reinform.de      http://www.reinform.de     |
|       +-------------------------------------------------------------+
|       | pflichtangaben nach paragraph 80, AktG:                     |
|       | reinform medien- und informationstechnologie AG, stuttgart  |
|       | handelsregister stuttgart, HRB 23001                        |
|       | vorstand:     dr. tilmann bubeck (vorsitz)                  |
|       | aufsichtsrat: frank stege (vorsitz)                         |
+-------+-------------------------------------------------------------+