GTK+ Forums

Dear forum,

I'm working on a small visualization. I want to have a toggle button for "online" and "offline". One time the button should be green, one time red. After reading a lot of manuals and tutorials, it seems to me, that it is not possible to set the color of the button manually. Is there a way?

Thanks for reading and maybe a hint :-)

Michael

There is but you wont find it in the API for GtkButton.
The class system in gtk works by inheritance, with GtkToggleButton inheriting from GtkButton, etc. If you can't find a function you want directly from the particular widget used you may find it from those it inherits from. Colour is quite a general property so you find it quite high up the inheritance tree under GtkWidget.
The function that should do it is: gtk_widget_modify_bg
An example of its use that can be readily adapted to your needs is given in: http://stackoverflow.com/questions/9948 ... get-in-gtk

Hello Paul,

first of all, thanks for your help :-)



I have compiled the example:

---------- SNIP ----------
#include <gtk/gtk.h>

static void on_destroy(GtkWidget* widget, gpointer data)
{
gtk_main_quit ();
}

int main (int argc, char* argv[])
{
GtkWidget* window;
GtkWidget* button;

gtk_init(&argc, &argv);
window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
g_signal_connect(G_OBJECT (window), "destroy",
G_CALLBACK (on_destroy), NULL);
button = gtk_button_new_with_label("Hello world!");
GdkColor red = {0, 0xffff, 0x0000, 0x0000};
GdkColor green = {0, 0x0000, 0xffff, 0x0000};
GdkColor blue = {0, 0x0000, 0x0000, 0xffff};
gtk_widget_modify_bg(button, GTK_STATE_NORMAL, &red);
gtk_widget_modify_bg(button, GTK_STATE_PRELIGHT, &green);
gtk_widget_modify_bg(button, GTK_STATE_ACTIVE, &blue);
gtk_container_add(GTK_CONTAINER(window), button);
gtk_widget_show_all(window);
gtk_main();
return 0;
}
---------- SNIP ----------

But the color of the button is not changing. It is still a gray button, and if I press them, it is a bit light blue, like all the other buttons in the system (by other programs).

What is wrong with my system, that I cannot overwrite the color?

Michael