What we call "System" theme should have very minimal edits over the
actual system theme. So let's drop all the "font-size" properties (one
"larger" one, but especially the many "smaller" ones).
This means that the "Default" theme also will keep system font size.
This is as discussed with Ville and Liam, the later saying he can barely
read dockable texts because of this.
On the other hand, we use "small" font size as a general rule in the
"Compact" theme, which is especially meant for people who want a compact
theme.
The Default theme may have been a bit too dark. Instead let's have it a
tiny bit lighter (and also foreground color a bit less white).
For now, the old "Default" dark theme doesn't disappear totally and is
moved to a "Darker" theme as we have been discussing and wondering on
whether this is prefered by some people (it is). Aryeom also thought a
darker theme may be a good idea.
Moreover Liam actually thought that losing some of the contrast
(especially with the text a tiny bit less white now) is not desired in
his case where eyes may not be as sharp as they used to. Therefore a
"High Contrast" theme may be needed.
Aryeom also suggested that sliders to choose colors could be a much more
generic solution, which might be possible yet would require more ugly
hacks generating on-the-fly theme changes (we do something similar for
dark theme choice already).
This is all work-in-progress and a result from Wilber Week 2023 work.
It seems I had forgotten some hardcoded color in there. I didn't notice it until
now, because it was not that bad in the few instances where it was shown (for
instance the comment field in export plug-ins), but I really realized there was
a problem with the Python console which was not too practical (white writing on
kinda light background).
I noticed some buttons had a bluish border, showing the system theme leaking
over our default theme. So I'm just overriding this with a grayscale color.
These 2 new rules are especially useful in dialogs so that you know what happens
when you hit "Enter". The "default" action (.suggested-action in GTK CSS) is the
action we set to be the active one by default. E.g. if you open a dialog and hit
Enter immediately, without touching any widget focus, this is what will be
activated.
The GTK CSS .default action on the other hand seems to simply be the button with
focus right now, which can be changed through Tab or other ways. If both types
of styles are visible, the .default one is the actually activated action (not
.suggested-action), which is why I make its style a bit stronger (solid rather
than dotted and a bit more opaque).
Also I discover the shade() function to reuse a color and adding it
transparency!
Checked buttons had a background using the @selected-color. This was because of
a too broad rule on `.text-button:checked`. Basically it looks like the broad
rules are not good because they sometimes override more accurate rules for
specific widgets.
I also make a few more rules a bit more accurate. Also I extend some CSS rules
for check and radio buttons.
We had some concept of slightly more extreme theme colors (i.e. darker in dark
themes) to color differently in some widget-in-widget cases.
For instance, we use this in the treeview list to separate it better from nearby
interface. But this extreme dark background may have been a bit "too dark", as
reported by Jacob. The goal is for this list to stand out, but maybe it was
standing out too much. Hopefully it's better now.
As a side change, I also add some borders to the top icon header (with "eye" and
"lock" icons) just above the list. I think it better explain the separation.
Just use an inverted logic for the selected text (i.e. white on black in light
mode, or black on white in dark mode). This is the usual logic for rendering
selected text anyway (except that we don't use non-grayscale colors, e.g. blue
background is common in system themes).
This was massively breaking GtkScale rendering. Or at least the marks (and mark
texts) added by gtk_scale_add_mark() were simply invisible.
I tried to figure why, staring at the GTK inspector and testing various CSS
rules to fix it without removing this line, but just couldn't make sense of it.
In the end, I'll just remove this line. It looks like in CSS (or just GTK CSS?),
it might be better to set rules on accurate widgets rather than too broad rules. 🤷
So what we read on the topic is to use (as base color) the gray which is
perceptually half-way between black and white. Unfortunately it can mean
different colors. For instance if using the sRGB TRC, the #808080 color is
sometimes cited.
Instead I went with the color LCH (50, 0, 0), i.e. with half perceptual
lightness in "CIE LCH(ab) float" babl space, i.e. #777777 in sRGB. It
corresponds to the 18.42% gray which is often refered to, so it seemed a fine
choice.
This replaces proposal in !683 because the contributor is not responding
anymore, and also it uses the common theme base CSS files used by all other
official themes.
This linear gradient really doesn't render any feeling of "background"
IMO. I only initially implemented it this way because the underlying
theme seemed to use such gradient effect on headerbar for background
dialogs, so I wanted to test this.
Anyway simply using the "disabled" color seem to work well. After all,
the semantic is similar too (if it's in the background, a dialog can be
considered inactive in some way). In any case, the meaning definitely
comes across now.
Don't use it only on menus. For instance, there were disabled checkboxes
(and their label) in plug-ins which were not showing different at all,
and it's confusing. Now both menu items, and other type of settings will
show similar "disabled" style.
Something which is regularly asked is to use smaller icons. We used to
have a "Small" theme in 2.8, which got away in 2.10 with icon sizing (cf
issue #6121).
This is a revival of such a theme (except I call it "Compact" because it
feels more appropriate than "Small"). The theme is basically the same as
"Default" (through an include), just tweaking some size related CSS
rules.
… variant.
Now with my recent code, instead of creating 2 different themes, I make
it a single theme containing both a Light and Dark variant.
I move all semantic logic into common.css which will be included by both
variants after they set up their color definitions.
For choosing the basic gray to use for the dark variant, I first looked
up what is usually recommended. Most articles on the web about dark
themes would cite some "Material design" project (apparently originated
from Google) which makes guidelines for Android/iOS/Flutter and web
applications. Their guidelines recommend #121212 ("Dark Grey") as
background color. I tried, it's **really** dark. Maybe I'm just not used
to it, but it feels like it might be OK for small phone "apps" which
people might want to watch in the dark, but possibly not for a full
grown desktop software. I don't really know, I might be wrong and some
people might want to edit their pictures with such dark GUI.
Anyway for now, I settled for a base background #303030, which is
already quite dark, darker than Adwaita dark or than our 2.10 dark
variant, but at least doesn't feel like a black hole.
Instead of hardcoding the colors in CSS rules, make variables of them,
with meaningful semantic names. It will help with making consistent
design where a color means something and is reused in several places
(e.g. a color for "hovering" or "selecting").
I add some variants but not too much (e.g. treeviews had even lighter
background, with an inversion of logic, where selected items are on
darker background instead of lighter).
Colors in this theme are mostly the same before and after this commit,
except for a few parts where I felt that having more variants was
detrimental for consistency and maintenance.
As part of the changed colors:
- check and radio buttons' background just reuse the lighter background
color (as used e.g. in treeviews and entries).
- menus also use this lighter background color with the color inversion
(same as treeviews) for hovered items.
This commit also brings some improvements to disabled cases:
- Stylize also disabled tree view items (e.g. disabled actions in action
search were styled the same way as runnable actions).
- Stylize the same way disabled buttons drawn directly or with an image
widget.
The last use for this change is that it will help to create a dark
variant for the same theme using nearly the same code, hence get
consistent styling.
- Indent all rules in Light theme with the same number of spaces for
style consistency.
- When GIMP was set in "Prefer dark variant", spin buttons and other
entries had too dark borders. Fix this.
- Fix the spinbutton entry's border radius which was at 0, but since the
buttons of the spin button are themselves rounded, it looks weird only
on the top and bottom left corners. So apply a 3px radius. I did this
in the System theme.
Makes the following changes:
*Toolbox Wilber is now visible
*Large black border removed from ScrolledWindow
*"Duplicate text" effect removed from labels
*Toolbox tabs are now stationary when changing selection
*"Add Tabs" menu background color changed to match Light theme
*Unnecessary border around Check Updates box removed
These are issues which appeared to me only when GIMP was set to use the
dark theme variant. In such a case, I guess we see quite well CSS rules
coming from parent themes, such as the globally set system theme.
* Remove any background image (which may come from the system theme?) on
buttons.
* The headerbar was dark and when in the background, it had a dark
linear gradient (probably coming from my system theme). So make sure
the background color is right as a general rule, and add back a
(small) light gradient to indicate the background state.
* GtkListBox had a dark background. We don't have a lot of usage for
this widget yet, but a few (for instance in icon theme settings, or in
the modifiers editor).
* The GtkSwitch buttons were dark on dark. Set a light background. Also
when the switch is ON, I add a bit of color, not too strong, but
enough to indicate the checked status, because I find this widget
design not so obvious. Since I don't think we use switch buttons
anywhere else but in Preferences, this is probably not a big problem
as it should not affect color perception when working on the canvas.
There were some complaint about the height of these scale.
The min-height was clearly too high. I also made the buttons a bit more
compact by removing a bit of padding.
Finally I add a CSS name to the class, in order to avoid using the
parent class name ("spinbutton"). This makes for clearer and more
customizable themes (ability to style the GimpSpinScale without styling
GtkSpinButton too).
In gimp.css, don't set a minimum height for GimpDisplayShell
statusbars. Instead, in GimpStatusbar, set the widget's minimum
height to the maximum of its children's natural heights. Note that
we have to do this manually, instead of using a size group, since
GtkSizeGroup::ignore-hidden is deprecated (and nonfunctional) in
GTK3.
Align GimpSpinScale with gimp-2-10, by modifying its appearance and
behavior to match the 2.10 compact style, fixing interaction along
the way. Unlike 2.10, there is no option to revert to the old
style.
- remove redundant frames, 3d-frames are gone anyway, so no need to
keep double out/in frames around
- give all color selector classes CSS names
- add/fix some theme CSS styles
Excluding them from becoming smaller by selecting
"GimpDock :not(toolpalette) button" doesn't work, so
make them large again using "GimpDock toolpalette button", I
have no idea why...
This is a first step to make our 2 symbolic themes into one and properly
"announce" them as symbolic through icon naming (which will allow
recoloring according to style colors).
With this CSS style, GTK+ widgets will search for symbolic icon variants
when using the generic name (with "*-symbolic" suffix).
Michael Natterer