On Thu, Nov 7, 2013 at 7:06 PM, Mahesh Chaudhari
<mahesh.chaudh...@ymail.com> wrote:
> On Thursday, 7 November 2013 10:46 AM, Andrew Potter <agpot...@gmail.com>
> wrote:
> On Thu, Nov 7, 2013 at 4:10 AM, Mahesh Chaudhari
> <mahesh.chaudh...@ymail.com> wrote:
>> Also (unsuccessfully) tried :
>> void enter_button1(GtkWidget *widget, gpointer data)
>> {
>> GtkStyle *style;
>> style = gtk_widget_get_style(button1);
>> style->bg[GTK_STATE_PRELIGHT] = style->bg[GTK_STATE_NORMAL];
>> gtk_widget_set_style(button1, style);
>> }
>
> This may not have worked because the theme style may be being applied
> after you call this function.
Actually the reason is may be that your theme is not setting the
background color, but is instead setting a _background image_.
What I found is that on my installation, a background image was being
set for the default button image, the image being a gradient from top
to bottom of a darker shade of gray. On hover, this gradient was not
drawn.
The example program below prevents my global theme from setting any
background image by default by overwriting it with a completely
transparent image of my own. This may or may not be what you want.
The question becomes, "How do I set a theme selector to use a
different, possibly defined elsewhere, selector?" e.g. set
GtkButton:hover to look the same as the standard GtkButton, whatever
it is.
I don't know.
#include <gtk/gtk.h>
const gchar my_style[] = "GtkButton:hover,\
GtkButton:prelight, \
GtkButton \
{ \
background-image: -gtk-gradient(linear, center top, center bottom,
from(rgba(0,0,255,0)), to (rgba(0,0,255,0))); \
}";
void on_realize(GtkWidget *widget, gpointer user_data) {
GError *error = NULL;
GdkScreen *screen = gtk_widget_get_screen(widget);
GtkCssProvider *provider = gtk_css_provider_get_default();
gtk_css_provider_load_from_data(provider, my_style,
G_N_ELEMENTS(my_style), &error);
if (error) {
fprintf(stderr, "Error loading CSS Theme: %s\n", error->message);
g_error_free(error);
} else {
gtk_style_context_add_provider_for_screen(screen,
GTK_STYLE_PROVIDER(provider),
GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
}
}
int main(int argc, char *argv[]) {
gtk_init(&argc, &argv);
GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
GtkWidget *grid = gtk_grid_new();
GtkWidget *button = gtk_button_new_with_label("Button!");
gtk_container_add(GTK_CONTAINER(grid), gtk_label_new("Label 1"));
gtk_container_add(GTK_CONTAINER(grid), button);
gtk_container_add(GTK_CONTAINER(grid), gtk_label_new("Label 2"));
gtk_container_add(GTK_CONTAINER(window), grid);
g_signal_connect(window, "realize", G_CALLBACK(on_realize), NULL);
g_signal_connect(window, "hide", G_CALLBACK(gtk_main_quit), NULL);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
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