+static gboolean
+is_all_selected (GtkWidget *widget)
+{
+ GtkEntryBuffer *buffer;
+ gint start_pos, end_pos;
+
+ if (!GTK_IS_ENTRY (widget))
+ return FALSE;
+
+ buffer = gtk_entry_get_buffer (GTK_ENTRY (widget));
+ return (gtk_editable_get_selection_bounds (GTK_EDITABLE (widget),
+ &start_pos, &end_pos)
+ && start_pos == 0
+ && end_pos == gtk_entry_buffer_get_length (buffer));
+}
+
+static gboolean
+is_at_left (GtkWidget *widget)
+{
+ return (GTK_IS_ENTRY (widget)
+ && gtk_editable_get_position (GTK_EDITABLE (widget)) == 0);
+}
+
+static gboolean
+is_at_right (GtkWidget *widget)
+{
+ GtkEntryBuffer *buffer;
+ gint length;
+
+ if (!GTK_IS_ENTRY (widget))
+ return FALSE;
+
+ buffer = gtk_entry_get_buffer (GTK_ENTRY (widget));
+ length = gtk_entry_buffer_get_length (buffer);
+ return gtk_editable_get_position (GTK_EDITABLE (widget)) == length;
+}
+
+static gboolean
+pspp_sheet_view_event (GtkWidget *widget,
+ GdkEventKey *event,
+ PsppSheetView *tree_view)
+{
+ PsppSheetViewColumn *column;
+ GtkTreePath *path;
+ gboolean handled;
+ gboolean cancel;
+ guint keyval;
+ guint state;
+ gint row;
+
+ /* Intercept only key press events.
+ It would make sense to use "key-press-event" instead of "event", but
+ GtkEntry attaches its own signal handler to "key-press-event" that runs
+ before ours and overrides our desired behavior for GDK_Up and GDK_Down.
+ */
+ if (event->type != GDK_KEY_PRESS)
+ return FALSE;
+
+ if (event->state & (GDK_CONTROL_MASK | GDK_SHIFT_MASK | GDK_MOD1_MASK))
+ {
+ /* Pass through most keys that include modifiers. */
+ if ((event->keyval == GDK_Tab || event->keyval == GDK_ISO_Left_Tab)
+ && !(event->state & (GDK_CONTROL_MASK | GDK_MOD1_MASK)))
+ {
+ /* Special case for Shift-Tab. */
+ }
+ else
+ return FALSE;
+ }
+
+ keyval = event->keyval;
+ state = event->state & ~(GDK_CONTROL_MASK | GDK_SHIFT_MASK | GDK_MOD1_MASK);
+ cancel = FALSE;
+ switch (event->keyval)
+ {
+ case GDK_Left: case GDK_KP_Left:
+ if (!is_all_selected (widget) && !is_at_left (widget))
+ return FALSE;
+ break;
+
+ case GDK_Right: case GDK_KP_Right:
+ if (!is_all_selected (widget) && !is_at_right (widget))
+ return FALSE;
+ break;
+
+ case GDK_Up: case GDK_KP_Up:
+ case GDK_Down: case GDK_KP_Down:
+ break;
+
+ case GDK_Page_Up: case GDK_KP_Page_Up:
+ case GDK_Page_Down: case GDK_KP_Page_Down:
+ break;
+
+ case GDK_Escape:
+ cancel = TRUE;
+ break;
+
+ case GDK_Return:
+ keyval = GDK_Down;
+ break;
+
+ case GDK_Tab:
+ case GDK_ISO_Left_Tab:
+ keyval = event->state & GDK_SHIFT_MASK ? GDK_Left : GDK_Right;
+ break;
+
+ default:
+ return FALSE;
+ }
+
+ row = tree_view->priv->edited_row;
+ column = tree_view->priv->edited_column;
+ path = gtk_tree_path_new_from_indices (row, -1);
+
+ pspp_sheet_view_stop_editing (tree_view, cancel);
+ gtk_widget_grab_focus (GTK_WIDGET (tree_view));
+
+ pspp_sheet_view_set_cursor (tree_view, path, column, FALSE);
+ gtk_tree_path_free (path);
+
+ handled = gtk_binding_set_activate (edit_bindings, keyval, state,
+ GTK_OBJECT (tree_view));
+ if (handled)
+ g_signal_stop_emission_by_name (widget, "event");
+
+ pspp_sheet_view_get_cursor (tree_view, &path, NULL);
+ pspp_sheet_view_start_editing (tree_view, path);
+ gtk_tree_path_free (path);
+
+ return handled;
+}
+
+static void
+pspp_sheet_view_override_cell_keypresses (GtkWidget *widget,
+ gpointer data)
+{
+ PsppSheetView *sheet_view = data;
+
+ g_signal_connect (widget, "event",
+ G_CALLBACK (pspp_sheet_view_event),
+ sheet_view);
+
+ if (GTK_IS_CONTAINER (widget))
+ gtk_container_foreach (GTK_CONTAINER (widget),
+ pspp_sheet_view_override_cell_keypresses,
+ data);
+}
+