GTK+ 2.8.17 and background colours
- From: Francesco Montorsi <f18m_cpp217828 yahoo it>
- To: gtk-devel-list gnome org
- Subject: GTK+ 2.8.17 and background colours
- Date: Fri, 21 Apr 2006 17:25:57 +0200
Hi,
I'm struggling with my GTK+ (2.8.17 - coming with ubuntu dapper) to
be able to set the background colour of a button.
I've googled and searched the archives of this mailing list and I have
found exactly same questions with attached test programs.
I'm attaching two short, simple test programs which *should* be able to
set the background colour of a button to a different colour from the
standard one.
Unfortunately running them I don't see any difference with a standard
GtkButton: i.e. the calls to gtk_widget_modify_bg and
gtk_widget_modify_fg seems not to have any effect !
Could anyone more expert try to compile those files and run them to see
if they get standard colours or not ?
(to compile them I usually place them in the gtk\examples\helloworld
folder and rename them to helloworld.c ;))
This seems like a GTK+ bug to me...
Thanks a lot,
Francesco
#include <gtk/gtk.h>
int main( int argc, char *argv[] )
{
GtkWidget *window;
GtkWidget *button;
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
button = gtk_button_new_with_label ("Hello World");
gtk_container_add (GTK_CONTAINER (window), button);
GdkColor color;
color.red = 65535;
color.blue = 0;
color.green = 65535;
gtk_widget_modify_bg ( button, GTK_STATE_NORMAL, &color );
GtkWidget *child_label;
child_label = gtk_bin_get_child (GTK_BIN (button) );
color.red = 0;
color.blue = 65535;
color.green = 0;
gtk_widget_modify_fg ( child_label, GTK_STATE_NORMAL, &color );
/* reuse text foreground color for window background */
gtk_widget_modify_bg ( window, GTK_STATE_NORMAL, &color );
gtk_widget_show (button);
gtk_widget_show (window);
gtk_main ();
return 0;
}
#include <stdlib.h> /* Needed for "exit" */
#include <gtk/gtk.h>
/* This is a callback function. The data arguments are ignored
* in this example. More on callbacks below. */
void hello( GtkWidget *widget,
gpointer data )
{
g_print ("Hello World\n");
}
gint delete_event( GtkWidget *widget,
GdkEvent *event,
gpointer data )
{
/* If you return FALSE in the "delete_event" signal handler,
* GTK will emit the "destroy" signal. Returning TRUE means
* you don't want the window to be destroyed.
* This is useful for popping up 'are you sure you want to quit?'
* type dialogs. */
g_print ("delete event occurred\n");
/* Change TRUE to FALSE and the main window will be destroyed with
* a "delete_event". */
return TRUE;
}
/* Another callback */
void destroy( GtkWidget *widget,
gpointer data )
{
gtk_main_quit ();
}
int main( int argc,
char *argv[] )
{
/* GtkWidget is the storage type for widgets */
GtkWidget *window;
GtkWidget *button;
/* This is called in all GTK applications. Arguments are parsed
* from the command line and are returned to the application. */
gtk_init (&argc, &argv);
/* create a new window */
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
/* When the window is given the "delete_event" signal (this is given
* by the window manager, usually by the "close" option, or on the
* titlebar), we ask it to call the delete_event () function
* as defined above. The data passed to the callback
* function is NULL and is ignored in the callback function. */
g_signal_connect (G_OBJECT (window), "delete_event",
G_CALLBACK (delete_event), NULL);
/* Here we connect the "destroy" event to a signal handler.
* This event occurs when we call gtk_widget_destroy() on the window,
* or if we return FALSE in the "delete_event" callback. */
g_signal_connect (G_OBJECT (window), "destroy",
G_CALLBACK (destroy), NULL);
/* Sets the border width of the window. */
gtk_container_set_border_width (GTK_CONTAINER (window), 10);
/* Creates a new button with the label "Hello World". */
button = gtk_button_new_with_label ("Hello World");
/* When the button receives the "clicked" signal, it will call the
* function hello() passing it NULL as its argument. The hello()
* function is defined above. */
g_signal_connect (G_OBJECT (button), "clicked",
G_CALLBACK (hello), NULL);
/* This will cause the window to be destroyed by calling
* gtk_widget_destroy(window) when "clicked". Again, the destroy
* signal could come from here, or the window manager. */
g_signal_connect_swapped (G_OBJECT (button), "clicked",
G_CALLBACK (gtk_widget_destroy),
G_OBJECT (window));
/* This packs the button into the window (a gtk container). */
gtk_container_add (GTK_CONTAINER (window), button);
/* New code to change the color of a button*/
GdkColor color;
/* Define the color for the button's background */
color.red = 65535;
color.blue = 0;
color.green = 65535;
/* Change the color of the button's background */
gtk_widget_modify_bg ( button, GTK_STATE_NORMAL, &color );
/* Get the pointer to the child widget */
GtkWidget *child_label;
child_label = gtk_bin_get_child (GTK_BIN (button) );
if (! child_label)
{
g_print ( "Label widget not defined\n" );
exit (1);
}
/* Define the color for the label's text */
color.red = 0;
color.blue = 65535;
color.green = 0;
gtk_widget_modify_fg ( child_label, GTK_STATE_NORMAL, &color );
/* End of new code */
/* The final step is to display this newly created widget. */
gtk_widget_show (button);
/* and the window */
gtk_widget_show (window);
/* All GTK applications must have a gtk_main(). Control ends here
* and waits for an event to occur (like a key press or
* mouse event). */
gtk_main ();
return 0;
}
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