allow most dock widgets to be used from command line This change is an initial attempt to allow the documentation, file, history, variable editor, and workspace widgets to be opened from the command line. While running in command line mode, some connections between those widgets and the interpreter or between two widgets may be missing. The aim is to eventually make those work but this is a good start. These dock widgets are now owned by the base_qobject object and shared with the main_window object. If they exist when the main_window is created (possible if using the new terminal widget) then a pointer to the main_window object is passed to the dock_widget so that they may be docked there. If the desktop is closed and control returns to the command line, undocked widgets remain available. * octave-qobject.h, octave-qobject.cc (base_qobject::m_documentation_widget, base_qobject::m_file_browser_widget, base_qobject::m_history_widget, base_qobject::m_workspace_widget, base_qobject::m_editor_widget, base_qobject::m_variable_editor_widget): New data members. (base_qobject::documentation_widget, base_qobject::file_browser_widget, base_qobject::history_widget, base_qobject::workspace_widget, base_qobject::editor_widget, base_qobject::variable_editor_widget): New functions to create dock widgets as needed. (base_qobject::show_documentation_window, base_qobject::show_file_browser_window, base_qobject::show_command_history_window, base_qobject::show_workspace_window, base_qobject::edit_variable, base_qobject::handle_variable_editor_update): New functions. Make signal slot connections that do not require the main window here, not in main_window::construct_octave_qt_link. * files-dock-widget.cc (files_dock_widget::files_dock_widget): If no parent, call make_window. * documentation-dock-widget.cc (documentation_dock_widget::documentation_dock_widget): Likewise. * history-dock-widget.cc (history_dock_widget::history_dock_widget): Likewise. * workspace-view.cc (workspace_view::workspace_view): Likewise. * doc.m: Always give the event manager a chance to display the documentation, not just if the GUI is running. * documentation.cc (documentation::documentation): Make sub-objects children of the documentation object, not children of the parent of the documentation object. * main-window.h, main-window.cc (main_window::m_command_window, main_window::m_history_window, main_window::m_file_browser_window, main_window::m_doc_browser_window, main_window::m_editor_window, main_window::m_workspace_window, main_window::m_variable_editor_window): Manage objects with QPointer. (main_window::main_window): Acquire m_doc_browser_window, m_history_window, m_workspace_window, and m_variable_editor_window from octave_qobj. * octave-dock-widget.cc (octave_dock_widget::octave_dock_widget): Don't reference m_parent if it is nullptr. (octave_dock_widget::handle_settings): Likewise. Return immediately if settings is nullptr. (octave_dock_widget::set_main_window): New function. * variable-editor.h, variable-editor.cc (variable_editor::~variable_editor): Explicitly delete m_tool_bar and set it to nullptr. (variable_editor::edit_variable, variable_editor::notice_settings, variable_editor::variable_destroyed): Avoid referencing m_tool_bar if it is nullptr. * qt-interpreter-events.h, qt-interpreter-events.cc (qt_interpreter_events::show_documentation): Rename from show_doc. Change all uses. (qt_interpreter_events::register_documentation): Rename from register_doc. Change all uses. (qt_interpreter_events::unregister_documentation): Rename from unregister_doc. Change all uses. (qt_interpreter_events::show_file_browser, qt_interpreter_events::show_command_history, qt_interpreter_events::show_workspace): New functions. (qt_interpreter_events::show_documentation_signal): Rename from show_doc_signal. Change all uses. qt_interpreter_events::register_documentation_signal): Rename from register_doc_signal. Change all uses. qt_interpreter_events::unregister_documentation_signal): Rename from unregister_doc_signal. Change all uses. (qt_interpreter_events::show_file_browser_signal, qt_interpreter_events::show_command_history_signal, qt_interpreter_events::show_workspace_signal): New signals. * event-manager.h, event-manager.cc (F__event_manager_show_file_browser__, F__event_manager_show_command_history__, F__event_manager_show_workspace__): New functions. (F__event_manager_show_documentation__): Rename from __event_manager_show_doc__. Change all uses. (F__event_manager_register_documentation__): Rename from F__event_manager_register_doc__. Change all uses. (F__event_manager_unregister_documentation__): Rename from F__event_manager_unregister_doc__. Change all uses. (Fopenvar): Don't require GUI to be running. (interpreter_events::show_documentation): Rename from show_doc. Change all uses. (interpreter_events::register_documentation): Rename from register_doc. Change all uses. (interpreter_events::unregister_documentation): Rename from unregister_doc. Change all uses. (interpreter_events::show_file_browser, interpreter_events::show_command_history, interpreter_events::show_workspace): New functions. (event_manager::show_documentation): Rename from show_doc. Change all uses. (event_manager::register_documentation): Rename from register_doc. Change all uses. (event_manager::register_documentation): Rename from unregister_doc. Change all uses.

////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2011-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_file_editor_interface_h)
#define octave_file_editor_interface_h 1

#include <QMenu>
#include <QMenuBar>
#include <QToolBar>

#include "gui-settings.h"
#include "octave-dock-widget.h"

namespace octave
{
  class base_qobject;

  class file_editor_interface : public octave_dock_widget
  {
    Q_OBJECT

  public:

    file_editor_interface (QWidget *p, base_qobject& oct_qobj)
      : octave_dock_widget ("FileEditor", p, oct_qobj)
    { }

    virtual ~file_editor_interface (void) = default;

    virtual QMenu * get_mru_menu (void) = 0;
    virtual QMenu * debug_menu (void) = 0;
    virtual QToolBar * toolbar (void) = 0;
    virtual QMenuBar * menubar (void) = 0;

    virtual void insert_global_actions (QList<QAction*>) = 0;
    virtual void handle_enter_debug_mode (void) = 0;
    virtual void handle_exit_debug_mode (void) = 0;

    virtual void
    handle_insert_debugger_pointer_request (const QString& file, int line) = 0;

    virtual void
    handle_delete_debugger_pointer_request (const QString& file, int line) = 0;

    virtual void
    handle_update_breakpoint_marker_request (bool insert, const QString& file,
                                             int line, const QString& cond) = 0;

    virtual void handle_edit_file_request (const QString& file) = 0;

    virtual bool check_closing (void) = 0;

    virtual void empty_script (bool, bool) = 0;

    virtual void restore_session (gui_settings *) = 0;

    virtual void enable_menu_shortcuts (bool enable) = 0;

  public slots:

    virtual void toplevel_change (bool) = 0;

    virtual void handle_file_remove (const QString& o, const QString& n) = 0;

    virtual void request_new_file (const QString& command = QString ()) = 0;

    virtual void request_open_file (const QString& openFileName,
                                    const QString& encoding = QString (),
                                    int line = -1,
                                    bool debug_pointer = false,
                                    bool breakpoint_marker = false,
                                    bool insert = true,
                                    const QString& cond = "",
                                    int index = -1) = 0;
  };
}

#endif