Ma lin wrote:
> thanks for you help, before the description is not very accurate,
>
> gtk: gtk+-2.10.14
> directfb : DirectFB-1.0.0 (with intel gdl as gfxdriver)
> cairo: cairo-1.4.2
> pango: pango-1.16.2
> cpu: intel Olo
>
> I used gtk_label_set_label to change my label text in my button click
> callback,
> but string(old one) not clear , so new one was over old one.
> and I found that new one just cover old one if font width not change,
> otherwise, old one could be show ether.
>
> I have no ideal ,it's pango layout bugs or something else?
> thanks for help
The code appears to function without problem on GTK/X11. Must be a
problem specific to pango on directfb. I'm preserving the code below,
so that the other people on the list might take a look.
Michael
> example code:
>
> #include <gtk/gtk.h>
>
> GtkWidget *label;
> static void hello( GtkWidget *widget,
> gpointer data )
> {
> gchar buffer[10] = {'\0'};
> static int index=0;
> index ++;
> switch (index)
> {
> case 1:
> strcpy (buffer, "really");
> break;
> case 2:
> strcpy (buffer, "cover");
> break;
> case 3:
> strcpy (buffer, "right");
> break;
> default:
> break;
> }
> if (index >=3)
> index = 0;
> gtk_label_set_text (GTK_LABEL(label), buffer);
> g_print ("Hello World\n");
> }
>
> static gboolean delete_event( GtkWidget *widget,
> GdkEvent *event,
> gpointer data )
> {
> g_print ("delete event occurred\n");
>
> return FALSE;
> }
>
> static void destroy( GtkWidget *widget,
> gpointer data )
> {
> gtk_main_quit ();
> }
>
> int main( int argc,
> char *argv[] )
> {
> GtkWidget *window;
> GtkWidget *button;
> GtkWidget *box;
>
> gtk_init (&argc, &argv);
>
> window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
> gtk_widget_set_size_request (window, 485, 108);
>
> g_signal_connect (G_OBJECT (window), "delete_event",
> G_CALLBACK (delete_event), NULL);
>
> g_signal_connect (G_OBJECT (window), "destroy",
> G_CALLBACK (destroy), NULL);
>
> gtk_container_set_border_width (GTK_CONTAINER (window), 10);
>
> box = gtk_hbox_new (TRUE, 0);
>
> button = gtk_button_new_with_label ("Hello World");
>
> g_signal_connect (G_OBJECT (button), "clicked",
> G_CALLBACK (hello), NULL);
>
> gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 0);
>
> label = gtk_label_new ("hello world");
> gtk_box_pack_start (GTK_BOX (box), label, FALSE, FALSE, 0);
>
> gtk_container_add (GTK_CONTAINER (window), box);
>
> gtk_widget_show_all (window);
>
> gtk_main ();
>
> return 0;
> }
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