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#define WIDTH 500
#define HEIGHT 300
static GdkPixmap *pixmap = NULL;
void refresh_cb(GtkWidget *draw_area, gpointer data)
{
if (pixmap == NULL)
{
pixmap = gdk_pixmap_new(draw_area->window, 500, HEIGHT, -1);
gdk_draw_rectangle(pixmap, draw_area->style->white_gc, TRUE, 0, 0, WIDTH, HEIGHT);
}
gdk_draw_pixmap(draw_area->window, draw_area->style->black_gc, pixmap, 0,0,0,0, WIDTH, HEIGHT);
}
int main(int argc, char **argv)
{
GtkWidget *pWin;
GtkWidget *pDrawArea;
GtkWidget *pVBox;
gtk_init(&argc, &argv);
pWin = gtk_window_new(GTK_WINDOW_TOPLEVEL);
gtk_window_set_default_size(GTK_WINDOW(pWin), WIDTH, HEIGHT);
g_signal_connect(G_OBJECT(pWin), "destroy", G_CALLBACK(gtk_main_quit), NULL);
pVBox = gtk_vbox_new(FALSE, 4);
gtk_container_add(GTK_CONTAINER(pWin), pVBox);
pDrawArea = gtk_drawing_area_new ();
gtk_widget_set_size_request (pDrawArea, WIDTH, HEIGHT);
g_signal_connect(G_OBJECT(pDrawArea),"event",G_CALLBACK(refresh_cb), NULL);
gtk_box_pack_start(GTK_BOX(pVBox), pDrawArea, TRUE, TRUE, 0);
gtk_window_set_title(GTK_WINDOW(pWin), "GTK-Win");
gtk_widget_show_all(pWin);
gtk_main();
return EXIT_SUCCESS;
} |
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