GTK+ Forums

Discussion forum for GTK+ and Programming. Ask questions, troubleshoot problems, view and post example code, or express your opinions.
It is currently Sun Nov 23, 2014 2:16 am

All times are UTC

Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: To change default background color in scribble-simple.c
PostPosted: Wed Dec 20, 2006 7:51 am 
Familiar Face

Joined: Fri Dec 08, 2006 6:44 am
Posts: 11
Hi All,

here is one simple GTK example scribble-simple.c, when I'm running it over DirectFB the default background of the screen is dark blue , I want to change it some other color ... Any idea where and what modifications should I do..

#include <stdlib.h>
#include <gtk/gtk.h>

/* Backing pixmap for drawing area */
static GdkPixmap *pixmap = NULL;

/* Create a new backing pixmap of the appropriate size */
static gboolean configure_event( GtkWidget *widget,
GdkEventConfigure *event )
if (pixmap)
g_object_unref (pixmap);

pixmap = gdk_pixmap_new (widget->window,
gdk_draw_rectangle (pixmap,
50, 50,

return TRUE;

/* Redraw the screen from the backing pixmap */
static gboolean expose_event( GtkWidget *widget,
GdkEventExpose *event )
gdk_draw_drawable (widget->window,
widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
event->area.x, event->area.y,
event->area.x, event->area.y,
event->area.width, event->area.height);

return FALSE;

/* Draw a rectangle on the screen */
static void draw_brush( GtkWidget *widget,
gdouble x,
gdouble y)
GdkRectangle update_rect;

update_rect.x = x - 5;
update_rect.y = y - 5;
update_rect.width = 10;
update_rect.height = 10;
gdk_draw_rectangle (pixmap,
update_rect.x, update_rect.y,
update_rect.width, update_rect.height);
gtk_widget_queue_draw_area (widget,
update_rect.x, update_rect.y,
update_rect.width, update_rect.height);

static gboolean button_press_event( GtkWidget *widget,
GdkEventButton *event )
if (event->button == 1 && pixmap != NULL)
draw_brush (widget, event->x, event->y);

return TRUE;

static gboolean motion_notify_event( GtkWidget *widget,
GdkEventMotion *event )
int x, y;
GdkModifierType state;

if (event->is_hint)
gdk_window_get_pointer (event->window, &x, &y, &state);
x = event->x;
y = event->y;
state = event->state;

if (state & GDK_BUTTON1_MASK && pixmap != NULL)
draw_brush (widget, x, y);

return TRUE;

void quit ()
exit (0);

int main( int argc,
char *argv[] )
GtkWidget *window;
GtkWidget *drawing_area;
GtkWidget *vbox;

GtkWidget *button;

gtk_init (&argc, &argv);

window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
gtk_widget_set_name (window, "Test Input");

vbox = gtk_vbox_new (FALSE, 0);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show (vbox);

g_signal_connect (G_OBJECT (window), "destroy",

/* Create the drawing area */

drawing_area = gtk_drawing_area_new ();
gtk_widget_set_size_request (GTK_WIDGET (drawing_area), 200, 200);
gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0);

gtk_widget_show (drawing_area);

/* Signals used to handle backing pixmap */

g_signal_connect (G_OBJECT (drawing_area), "expose_event",
G_CALLBACK (expose_event), NULL);
g_signal_connect (G_OBJECT (drawing_area),"configure_event",
G_CALLBACK (configure_event), NULL);

/* Event signals */

g_signal_connect (G_OBJECT (drawing_area), "motion_notify_event",
G_CALLBACK (motion_notify_event), NULL);
g_signal_connect (G_OBJECT (drawing_area), "button_press_event",
G_CALLBACK (button_press_event), NULL);

gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK

/* .. And a quit button */
button = gtk_button_new_with_label ("Quit");
gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);

g_signal_connect_swapped (G_OBJECT (button), "clicked",
G_CALLBACK (gtk_widget_destroy),
G_OBJECT (window));
gtk_widget_show (button);

gtk_widget_show (window);

gtk_main ();

return 0;

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC

Who is online

Users browsing this forum: Google [Bot], Yahoo [Bot] and 1 guest

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group