Pileus Git - ~andy/gtk/blob - examples/selection/setselection.c

   1
   2 #include <stdlib.h>
   3 #include <gtk/gtk.h>
   4 #include <time.h>
   5 #include <string.h>
   6
   7 GtkWidget *selection_button;
   8 GtkWidget *selection_widget;
   9
  10 /* Callback when the user toggles the selection */
  11 static void selection_toggled( GtkWidget *widget,
  12                                gint      *have_selection )
  13 {
  14   if (GTK_TOGGLE_BUTTON (widget)->active)
  15     {
  16       *have_selection = gtk_selection_owner_set (selection_widget,
  17                                                  GDK_SELECTION_PRIMARY,
  18                                                  GDK_CURRENT_TIME);
  19       /* if claiming the selection failed, we return the button to
  20          the out state */
  21       if (!*have_selection)
  22         gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (widget), FALSE);
  23     }
  24   else
  25     {
  26       if (*have_selection)
  27         {
  28           /* Before clearing the selection by setting the owner to NULL,
  29              we check if we are the actual owner */
  30           if (gdk_selection_owner_get (GDK_SELECTION_PRIMARY) == widget->window)
  31             gtk_selection_owner_set (NULL, GDK_SELECTION_PRIMARY,
  32                                      GDK_CURRENT_TIME);
  33           *have_selection = FALSE;
  34         }
  35     }
  36 }
  37
  38 /* Called when another application claims the selection */
  39 static gboolean selection_clear( GtkWidget         *widget,
  40                                  GdkEventSelection *event,
  41                                  gint              *have_selection )
  42 {
  43   *have_selection = FALSE;
  44   gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (selection_button), FALSE);
  45
  46   return TRUE;
  47 }
  48
  49 /* Supplies the current time as the selection. */
  50 static void selection_handle( GtkWidget        *widget,
  51                               GtkSelectionData *selection_data,
  52                               guint             info,
  53                               guint             time_stamp,
  54                               gpointer          data )
  55 {
  56   gchar *timestr;
  57   time_t current_time;
  58
  59   current_time = time (NULL);
  60   timestr = asctime (localtime (&current_time));
  61   /* When we return a single string, it should not be null terminated.
  62      That will be done for us */
  63
  64   gtk_selection_data_set (selection_data, GDK_SELECTION_TYPE_STRING,
  65                           8, timestr, strlen (timestr));
  66 }
  67
  68 int main( int   argc,
  69           char *argv[] )
  70 {
  71   GtkWidget *window;
  72
  73   static int have_selection = FALSE;
  74
  75   gtk_init (&argc, &argv);
  76
  77   /* Create the toplevel window */
  78
  79   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  80   gtk_window_set_title (GTK_WINDOW (window), "Event Box");
  81   gtk_container_set_border_width (GTK_CONTAINER (window), 10);
  82
  83   g_signal_connect (window, "destroy",
  84                     G_CALLBACK (exit), NULL);
  85
  86   /* Create a toggle button to act as the selection */
  87
  88   selection_widget = gtk_invisible_new ();
  89   selection_button = gtk_toggle_button_new_with_label ("Claim Selection");
  90   gtk_container_add (GTK_CONTAINER (window), selection_button);
  91   gtk_widget_show (selection_button);
  92
  93   g_signal_connect (selection_button, "toggled",
  94                     G_CALLBACK (selection_toggled), &have_selection);
  95   g_signal_connect (selection_widget, "selection-clear-event",
  96                     G_CALLBACK (selection_clear), &have_selection);
  97
  98   gtk_selection_add_target (selection_widget,
  99                             GDK_SELECTION_PRIMARY,
 100                             GDK_SELECTION_TYPE_STRING,
 101                             1);
 102   g_signal_connect (selection_widget, "selection-get",
 103                     G_CALLBACK (selection_handle), &have_selection);
 104
 105   gtk_widget_show (selection_button);
 106   gtk_widget_show (window);
 107
 108   gtk_main ();
 109
 110   return 0;
 111 }