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gtk: Do not override window background colour when using a dark theme

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When the user chooses a global dark theme, the window background will
be dark and the default text colour light.  Overriding the window
background to be light grey can make the menu and status bars
unreadable.  In case a dark theme is used, only set the background
colour for the content area.

References: https://bugs.debian.org/944237
This commit is contained in:
Ben Hutchings
2022-02-13 22:23:31 +01:00
committed by Simon Tatham
parent 4c1e47b272
commit 3d0c734e43
1 changed files with 30 additions and 6 deletions
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28
gtk.c
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@ -2,6 +2,10 @@
* gtk.c: GTK front end for my puzzle collection.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1 /* for strcasestr */
#endif
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
@ -389,6 +393,21 @@ static void print_set_colour(frontend *fe, int colour)
static void set_window_background(frontend *fe, int colour)
{
#if GTK_CHECK_VERSION(3,0,0)
/* In case the user's chosen theme is dark, we should not override
* the background colour for the whole window as this makes the
* menu and status bars unreadable. This might be visible through
* the gtk-application-prefer-dark-theme flag or else we have to
* work it out from the name. */
gboolean dark_theme = FALSE;
char *theme_name = NULL;
g_object_get(gtk_settings_get_default(),
"gtk-application-prefer-dark-theme", &dark_theme,
"gtk-theme-name", &theme_name,
NULL);
if (theme_name && strcasestr(theme_name, "-dark"))
dark_theme = TRUE;
g_free(theme_name);
#if GTK_CHECK_VERSION(3,20,0)
char css_buf[512];
sprintf(css_buf, ".background { "
@ -401,22 +420,27 @@ static void set_window_background(frontend *fe, int colour)
if (!gtk_css_provider_load_from_data(
GTK_CSS_PROVIDER(fe->css_provider), css_buf, -1, NULL))
assert(0 && "Couldn't load CSS");
if (!dark_theme) {
gtk_style_context_add_provider(
gtk_widget_get_style_context(fe->window),
GTK_STYLE_PROVIDER(fe->css_provider),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
}
gtk_style_context_add_provider(
gtk_widget_get_style_context(fe->area),
GTK_STYLE_PROVIDER(fe->css_provider),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
#elif GTK_CHECK_VERSION(3,0,0)
#else
GdkRGBA rgba;
rgba.red = fe->colours[3*colour + 0];
rgba.green = fe->colours[3*colour + 1];
rgba.blue = fe->colours[3*colour + 2];
rgba.alpha = 1.0;
gdk_window_set_background_rgba(gtk_widget_get_window(fe->area), &rgba);
gdk_window_set_background_rgba(gtk_widget_get_window(fe->window), &rgba);
if (!dark_theme)
gdk_window_set_background_rgba(gtk_widget_get_window(fe->window),
&rgba);
#endif
#else
GdkColormap *colmap;