Syntax Window: Dynamically set paste sensitivity

Set the sensitivity of the paste action according to
whether there is anything to be pasted in the clipboard.

diff --git a/src/ui/gui/psppire-syntax-window.c b/src/ui/gui/psppire-syntax-window.c
index 77d20ab2bb3860c65114eda1b367d95772dfd235..058e27c505982d1728c5076c2b5dc0f3f183163d 100644 (file)
--- a/src/ui/gui/psppire-syntax-window.c
+++ b/src/ui/gui/psppire-syntax-window.c
@@ -271,7 +271,7 @@ contents_received_callback (GtkClipboard *clipboard,
 
 }
 
-void
+static void
 on_edit_paste (PsppireSyntaxWindow *sw)
 {
   GdkDisplay *display = gtk_widget_get_display (GTK_WIDGET (sw));
@@ -284,6 +284,26 @@ on_edit_paste (PsppireSyntaxWindow *sw)
                                  sw);
 }
 
+static void
+on_owner_change (GtkClipboard *clip, GdkEventOwnerChange *event, gpointer data)
+{
+  gint i;
+  gboolean compatible_target = FALSE;
+  PsppireSyntaxWindow *sw = PSPPIRE_SYNTAX_WINDOW (data);
+
+  for (i = 0 ; i < sizeof (targets) / sizeof (targets[0]) ; ++i)
+    {
+      GdkAtom atom = gdk_atom_intern (targets[i].target, TRUE);
+      if ( gtk_clipboard_wait_is_target_available (clip, atom))
+       {
+         compatible_target = TRUE;
+         break;
+       }
+    }
+
+  gtk_action_set_sensitive (sw->edit_paste, compatible_target);
+}
+
 
 \f
 
@@ -552,11 +572,12 @@ psppire_syntax_window_init (PsppireSyntaxWindow *window)
 
   GtkWidget *text_view = get_widget_assert (xml, "syntax_text_view");
 
+  GtkClipboard *clip_selection = gtk_widget_get_clipboard (GTK_WIDGET (window), GDK_SELECTION_CLIPBOARD);
+  GtkClipboard *clip_primary =   gtk_widget_get_clipboard (GTK_WIDGET (window), GDK_SELECTION_PRIMARY);
 
-  GtkClipboard *clipboard =
-    gtk_widget_get_clipboard (GTK_WIDGET (window), GDK_SELECTION_PRIMARY);
+  g_signal_connect_swapped (clip_primary, "owner-change", G_CALLBACK (selection_changed), window);
 
-  g_signal_connect_swapped (clipboard, "owner-change", G_CALLBACK (selection_changed), window);
+  g_signal_connect (clip_selection, "owner-change", G_CALLBACK (on_owner_change), window);
 
   window->cliptext = NULL;
 
@@ -565,8 +586,6 @@ psppire_syntax_window_init (PsppireSyntaxWindow *window)
   window->edit_cut = get_action_assert (xml, "edit_cut");
   window->edit_paste = get_action_assert (xml, "edit_paste");
 
-gtk_action_set_sensitive (window->edit_paste, TRUE);
-
   window->buffer = gtk_text_view_get_buffer (GTK_TEXT_VIEW (text_view));
   window->lexer = lex_create (the_source_stream);