use signal/slot for updating workspace instead of using event listener * main-window.h, main-window.cc: Clean up list of include files. (main_window::prepare_to_exit): Rename from prepare_to_quit. Change all uses. (main_window::update_workspace): Delete. (main_window::construct): Don't connect _octave_qt_event_listener:update_workspace_signal to main_window::update_workspace. (main_window::construct_octave_qt_link): Connect _octave_qt_link::set_workspace_signal to _workspace_model::set_workspace. Connect _octave_qt_link::clear_workspace_signal to _workspace_model::clear_workspace. * symbol-information.h, symbol-information.cc: Delete * libgui/src/module.mk (noinst_HEADERS, src_libgui_src_la_SOURCES): Remove them from the lists. * octave-qt-link.h, octave-qt-link.cc: Don't use symbol_information to store workspace info. (octave_qt_link::do_update_workspace): Delete. (octave_qt_link::do_set_workspace, octave_qt_link::do_clear_workspace): New functions. (octave_qt_link::do_pre_input_event): Don't call do_update_workspace. (octave_qt_link::set_workspace_signal, octave_qt_link::clear_workspace_signal): New signals. * workspace-model.h, workspace-model.cc: Don't use symbol_information to store workspace info. Accept workspace info through a signal/slot combination, not by asking the symbol table. (workspace_model::request_update_workspace, (workspace_model::update_workspace_callback): Delete. (workspace_model::set_workspace, workspace_model::clear_workspace, workspace_model::clear_data, workspace_model::clear_tree, workspace_model::update_tree, workspace_model::append_tree): New functions. * workspace-view.h, workspace-view.cc (workspace_view::model_changed): Don't call update_workspace_callback. The model now signals the view when it has changed. * input.cc (octave_base_reader::octave_gets, get_debug_input): Call octave_link::set_workspace just prior to prompting for input. * workspace-element.h: New file. * libinterp/interpfcn/module.mk (INTERPFCN_INC): Include it in the list. * octave-link.cc: Don't include symtab.h. * octave-link.h (octave_link::update_workspace): Delete. (octave_link::set_workspace, octave_link::do_set_workspace, * octave_link::clear_workspace, octave_link::do_clear_workspace): New functions. * symtab.h, symtab.cc (symbol_table::workspace_info, symbol_table::do_workspace_info): New functions. * ov.h (octave_value::short_disp): New function. * ov-base.h, ov-base.cc (octave_base_value::short_disp): New function. * ov-base-scalar.h, ov-base-scalar.cc (octave_base_scalar<ST>::short_disp): New function. * ov-range.h, ov-range.cc (octave_range::short_disp): New function.

--- a/libgui/src/octave-qt-link.cc	Sat Apr 06 18:08:08 2013 +0100
+++ b/libgui/src/octave-qt-link.cc	Mon Apr 08 12:01:24 2013 -0400
@@ -30,6 +30,8 @@
 
 #include "str-vec.h"
 
+#include "workspace-element.h"
+
 #include "octave-qt-link.h"
 
 octave_qt_link::octave_qt_link (void)
@@ -58,14 +60,31 @@
 }
 
 void
-octave_qt_link::do_update_workspace (void)
+octave_qt_link::do_set_workspace (const std::list<workspace_element>& ws)
 {
-  if (event_listener)
+  QString scopes;
+  QStringList symbols;
+  QStringList class_names;
+  QStringList dimensions;
+  QStringList values;
+
+  for (std::list<workspace_element>::const_iterator it = ws.begin ();
+       it != ws.end (); it++)
     {
-      event_listener->update_workspace ();
+      scopes.append (it->scope ());
+      symbols.append (QString::fromStdString (it->symbol ()));
+      class_names.append (QString::fromStdString (it->class_name ()));
+      dimensions.append (QString::fromStdString (it->dimension ()));
+      values.append (QString::fromStdString (it->value ()));
+    }
 
-      do_process_events ();
-    }
+  emit set_workspace_signal (scopes, symbols, class_names, dimensions, values);
+}
+
+void
+octave_qt_link::do_clear_workspace (void)
+{
+  emit clear_workspace_signal ();
 }
 
 void
@@ -94,7 +113,6 @@
 void
 octave_qt_link::do_pre_input_event (void)
 {
-  do_update_workspace ();
 }
 
 void