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Dear Gnome.
I got a prablem about programming in Gtk+. The following program creat a 'Button'.But there is a problem with the 'static void callback( GtkWidget *widget, gpointer data )'. In this part of the program ,i want to change the cursor before the program executing the for-loop. Here is the problem.In this program ,it always execute the for-loop first and then change the cursor.I do not understand what happen. Could you tell what's wrong with my program and how to fix it.Thanks. Gordon #include <unistd.h> #include <stdlib.h> #include <gtk/gtk.h> #include <pthread.h> /* Create a new hbox with an image and a label packed into it * and return the box. */ static GtkWidget *xpm_label_box( gchar *xpm_filename, gchar *label_text ) { GtkWidget *box; GtkWidget *label; GtkWidget *image; /* Create box for image and label */ box = gtk_hbox_new (FALSE, 0); gtk_container_set_border_width (GTK_CONTAINER (box), 2); /* Now on to the image stuff */ image = gtk_image_new_from_file (xpm_filename); /* Create a label for the button */ label = gtk_label_new (label_text); /* Pack the image and label into the box */ gtk_box_pack_start (GTK_BOX (box), image, FALSE, FALSE, 3); gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 3); gtk_widget_show (image); gtk_widget_show (label); return box; } static int cursor_change(gpointer data_pass) { GtkWidget *window = (GtkWidget *) data_pass; gdk_threads_enter(); GThread *gthread; g_thread_set_priority(gthread, G_THREAD_PRIORITY_URGENT); g_thread_self(); { //Set A Cursor GdkCursor *new_cursor; new_cursor=gdk_cursor_new(GDK_WATCH); g_print ("I make it!"); gdk_window_set_cursor(window->window, new_cursor); gdk_cursor_destroy(new_cursor); } gdk_threads_leave(); return 0; } /* Our usual callback function */ static void callback( GtkWidget *widget, gpointer data ) { gint ptimer; ptimer=g_timeout_add(1, (GtkFunction)cursor_change, data); //ptimer=gdk_threads_add_timeout(100, (GtkFunction)cursor_change, data); sleep(1); int i,j; for(i=0;i<100;i++) { g_print ("Hello again - %s was pressed %d\n", (char *) data,i); } /* GdkCursor *renew_cursor; renew_cursor=gdk_cursor_new(GDK_PENCIL); gdk_window_set_cursor(window->window, renew_cursor); gdk_cursor_destroy(renew_cursor);* */ } int main( int argc, char *argv[] ) { /* GtkWidget is the storage type for widgets */ GtkWidget *window; GtkWidget *button; GtkWidget *box; gtk_init (&argc, &argv); /* // set foreground color is different from color key { GdkColor color; GdkColormap *map; memset(&color, 0, sizeof(color)); color.blue = 10000; map = gdk_colormap_get_system(); gdk_color_alloc(map, &color); gdk_gc_set_foreground(window->style->black_gc, &color); }*/ gtk_rc_parse("/vpon/gui.rc"); /* Create a new window */ window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Pixmap'd Buttons!"); /* It's a good idea to do this for all windows. */ g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (gtk_main_quit), NULL); g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (gtk_main_quit), NULL); /* Sets the border width of the window. */ gtk_container_set_border_width (GTK_CONTAINER (window), 10); /* Create a new button */ button = gtk_button_new (); /* Connect the "clicked" signal of the
button to our callback */
g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (callback), (gpointer) window); /* This calls our box creating function */ box = xpm_label_box ("info.xpm", "cool button"); /* Pack and show all our widgets */ gtk_widget_show (box); gtk_container_add (GTK_CONTAINER (button), box); gtk_widget_show (button); gtk_container_add (GTK_CONTAINER (window), button); gtk_widget_show (window); /* Rest in gtk_main and wait for the fun to begin! */ gtk_main (); return 0; } |