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/m-editor/file-editor-tab.h
+++ b/libgui/src/m-editor/file-editor-tab.h
@@ -27,18 +27,15 @@
 #include <QWidget>
 #include <QCloseEvent>
 #include <QFileSystemWatcher>
-#include "octave-event-observer.h"
 
 class file_editor;
-class file_editor_tab : public QWidget, public octave_event_observer
+class file_editor_tab : public QWidget
 {
   Q_OBJECT
   public:
   file_editor_tab (file_editor *fileEditor);
   bool copy_available ();
 
-  void handle_event (octave_event *e, bool accept);
-
 public slots:
   void update_window_title(bool modified);
   void handle_copy_available(bool enableCopy);
@@ -87,6 +84,18 @@
   void set_file_name (const QString& fileName);
 
 private:
+
+  struct bp_info
+  {
+    bp_info (const QString& p, const QString& fn, int l)
+      : path (p.toStdString ()), function_name (fn.toStdString ()), line (l)
+    { }
+
+    std::string path;
+    std::string function_name;
+    int line;
+  };
+
   void update_lexer ();
   void request_add_breakpoint (int line);
   void request_remove_breakpoint (int line);
@@ -95,6 +104,11 @@
   int check_file_modified (const QString& msg, int cancelButton);
   void do_comment_selected_text (bool comment);
 
+  void run_file_callback (void);
+  void add_breakpoint_callback (const bp_info& info);
+  void remove_breakpoint_callback (const bp_info& info);
+  void remove_all_breakpoints_callback (const bp_info& info);
+
   file_editor *         _file_editor;
   QsciScintilla *       _edit_area;