+ if (_vlabel.get_parent()) {
+ _vbox.remove (_vlabel);
+ }
+
+ /* The list with the most channels goes on left or right, so that the most channel
+ names are printed horizontally and hence more readable. However we also
+ maintain notional `signal flow' vaguely from left to right. Subclasses
+ should choose where to put ports based on signal flowing from _ports[0]
+ to _ports[1] */
+
+ if (N[0] > N[1]) {
+
+ _row_index = 0;
+ _column_index = 1;
+ _arrangement = LEFT_TO_BOTTOM;
+ _vlabel.set_label (_("<b>Sources</b>"));
+ _hlabel.set_label (_("<b>Destinations</b>"));
+ _vlabel.set_angle (90);
+
+ _vbox.pack_end (_vlabel, false, false);
+ _vbox.pack_end (_vnotebook, false, false);
+ _vbox.pack_end (_vspacer, true, true);
+
+#define REMOVE_FROM_GTK_PARENT(WGT) if ((WGT).get_parent()) { (WGT).get_parent()->remove(WGT);}
+ REMOVE_FROM_GTK_PARENT(*_body)
+ REMOVE_FROM_GTK_PARENT(_vscroll)
+ REMOVE_FROM_GTK_PARENT(_hscroll)
+ REMOVE_FROM_GTK_PARENT(_vbox)
+ REMOVE_FROM_GTK_PARENT(_hbox)
+
+ attach (*_body, 2, 3, 1, 2, FILL | EXPAND, FILL | EXPAND);
+ attach (_vscroll, 3, 4, 1, 2, SHRINK);
+ attach (_hscroll, 2, 3, 3, 4, FILL | EXPAND, SHRINK);
+ attach (_vbox, 1, 2, 1, 2, SHRINK);
+ attach (_hbox, 2, 3, 2, 3, FILL | EXPAND, SHRINK);
+
+ } else {
+
+ _row_index = 1;
+ _column_index = 0;
+ _arrangement = TOP_TO_RIGHT;
+ _hlabel.set_label (_("<b>Sources</b>"));
+ _vlabel.set_label (_("<b>Destinations</b>"));
+ _vlabel.set_angle (-90);
+
+ _vbox.pack_end (_vspacer, true, true);
+ _vbox.pack_end (_vnotebook, false, false);
+ _vbox.pack_end (_vlabel, false, false);
+
+ REMOVE_FROM_GTK_PARENT(*_body)
+ REMOVE_FROM_GTK_PARENT(_vscroll)
+ REMOVE_FROM_GTK_PARENT(_hscroll)
+ REMOVE_FROM_GTK_PARENT(_vbox)
+ REMOVE_FROM_GTK_PARENT(_hbox)
+
+ attach (*_body, 1, 2, 2, 3, FILL | EXPAND, FILL | EXPAND);
+ attach (_vscroll, 3, 4, 2, 3, SHRINK);
+ attach (_hscroll, 1, 2, 3, 4, FILL | EXPAND, SHRINK);
+ attach (_vbox, 2, 3, 2, 3, SHRINK);
+ attach (_hbox, 1, 2, 1, 2, FILL | EXPAND, SHRINK);