refactor GUI event handling to use new event_queue class * octave-link.h, octave-link.cc (event_queue): Delete. (gui_event_queue): New event_queue variable. Change all uses of event_queue to user gui_event_queue instead. (octave_link::handle_event): Delete. (octave_link::post_event, octave_link::do_post_event): Provide methods that work directly with member functions pointers and data. * octave-event.h, octave-event.cc, octave-event-observer.h: Delete. Delete all uses. * libgui/src/module.mk (noinst_HEADERS): Delete octave-event.h and octave-event-observer.h from the list. (src_libgui_src_la_SOURCES): Delete octave-event.cc from the list. * workspace-view.h, history-dockwidget.h, main-window.h: Don't include octave-link.h. * history-dockwidget.cc (history_dock_widget::handle_event): Delete. (history_dock_widget::handle_event): New function adapted from handle_event. (history_dock_widget::request_history_model_update): Update for new event callback mechanism. * history-dockwidget.h: Update decls. * file-editor-tab.cc (file_editor_tab::handle_event): Delete. (file_editor_tab::run_file_callback, file_editor_tab::add_breakpoint_callback, file_editor_tab::remove_breakpoint_callback, file_editor_tab::remove_all_breakpoints_callback): New functions adapted from handle_event and corresponding octave_event classes. (file_editor_tab::request_add_breakpoint, file_editor_tab::request_remove_breakpoint, file_editor_tab::remove_all_breakpoints, file_editor_tab::run_file): Update for new event callback mechanism. * file-editor-tab.h: Update decls. (file_editor_tab::bp_info): New nested struct. * main-window.cc (main_window::handle_event): Delete. (main_window::save_workspace_callback, main_window::load_workspace_callback, main_window::clear_workspace_callback, main_window::clear_history_callback, main_window::change_directory_callback, main_window::debug_continue_callback, main_window::debug_step_into_callback, main_window::debug_step_over_callback, main_window::debug_step_out_callback, main_window::debug_quit_callback, main_window::exit_callback): New functions. (main_window::handle_save_workspace_request, main_window::handle_load_workspace_request, main_window::handle_clear_workspace_request, main_window::handle_clear_history_request, main_window::change_current_working_directory, main_window::set_current_working_directory, main_window::debug_continue, main_window::debug_step_into, main_window::debug_step_over, main_window::debug_step_out, main_window::debug_quit): Update for new event callback mechanism. * main-window.h: Update decls. * workspace-model.cc (workspace_model::handle_event): Delete. (workspace_model::update_workspace_callback): New function. (workspace_model::request_update_workspace): Update for new event callback mechanism. * workspace-model.h: Update decls.

--- a/libgui/src/workspace-model.h
+++ b/libgui/src/workspace-model.h
@@ -30,7 +30,6 @@
 #include <QTimer>
 
 #include "symbol-information.h"
-#include "octave-event-observer.h"
 
 class tree_item
 {
@@ -112,7 +111,7 @@
 };
 
 class workspace_model
-  : public QAbstractItemModel, public octave_event_observer
+  : public QAbstractItemModel
 {
   Q_OBJECT
 
@@ -120,8 +119,6 @@
   workspace_model (QObject *parent = 0);
   ~workspace_model ();
 
-  void handle_event (octave_event *e, bool accept);
-
   QVariant data (const QModelIndex &index, int role) const;
   Qt::ItemFlags flags (const QModelIndex &index) const;
   QVariant headerData (int section, Qt::Orientation orientation,
@@ -142,6 +139,9 @@
   void model_changed ();
 
 private:
+
+  void update_workspace_callback (void);
+
   /** Timer for periodically updating the workspace model from the current
    * symbol information. */
   QTimer _update_workspace_model_timer;