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.

/*

Copyright (C) 2012-2013 Richard Crozier

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if !defined (octave_dock_widget_h)
#define octave_dock_widget_h 1

#include <QDockWidget>

class octave_dock_widget : public QDockWidget
{
  Q_OBJECT

public:

  octave_dock_widget (QWidget *p)
    : QDockWidget (p)
  {
    connect (this, SIGNAL (visibilityChanged (bool)),
             this, SLOT (handle_visibility_changed (bool)));

    connect (this, SIGNAL (topLevelChanged (bool)),
             this, SLOT (top_level_changed (bool)));
  }

  virtual ~octave_dock_widget () { }

  virtual void connect_visibility_changed (void)
  {
    connect (this, SIGNAL (visibilityChanged (bool)),
             this, SLOT (handle_visibility (bool)));
  }

signals:

  /** Custom signal that tells whether a user has clicked away
   *  that dock widget, i.e the active dock widget has
   *  changed. */
  void active_changed (bool active);

protected:

  virtual void closeEvent (QCloseEvent *e)
  {
    emit active_changed (false);
    QDockWidget::closeEvent (e);
  }

public slots:

  virtual void focus (void)
  {
    if (! isVisible ())
      setVisible (true);

    setFocus ();
    activateWindow ();
    raise ();
  }

  virtual void handle_visibility (bool visible)
  {
    if (visible && ! isFloating ())
      focus ();
  }

protected slots:

  /** Slot to steer changing visibility from outside. */
  virtual void handle_visibility_changed (bool visible)
  {
    if (visible)
      emit active_changed (true);
  }

  /** Slot when floating property changes */
  virtual void top_level_changed (bool floating)
  {
    if (floating)
      {
        // Make a window from the widget when floating and make it
        // visible again since setWindowFlags hides it.
        setWindowFlags (Qt::Window);
        show();
      }
  }
};

#endif