Redo portions of file editor to use more signals/slots rather than casting. * file-editor-tab.cc, file-editor-tab.h (file_editor_tab::~file_editor_tab): Add. Delete lexer to prevent memory leak. Delete _edit_area to prevent memory leak. (file_editor_tab::conditional_close): Add. Simple slot that uses QWidget pointer as unique ID, not for function call. (file_editor_tab::file_name_query): Add. Simple slot that signals file name to whomever is connected. (file_editor_tab::find, file_editor_tab : public QWidget): Removed use of exec() and keep a pointer to the find_dialog as a member. Toggle hide()/show() via a connected slot to toggle visibility as desired. * file-editor.cc, file-editor.h, file-editor-tab.cc file-editor-tab.h (file_editor : public file_editor_interface, file_editor_tab : public QWidget, file_editor_tab::file_editor_tab, file_editor_tab::closeEvent, file_editor_tab::load_file, file_editor_tab::new_file, file_editor_tab::run_file): Remove _file_editor pointer member from file_editor_tab and rid file_editor::get_main_window from file_editor. There should be no need for such information about higher-level hierarchy inside lower-level objects. (file_editor::request_open_file, file_editor_tab::open_file): Move QFileDialog to file_editor::request_open_file and delete file_editor_tab::open_file since most of the remaining functionality is in file_editor_tab::load_file. (file_editor::active_editor_tab): Deleted. (file_editor::fetab_change_request, file_editor_tab::change_editor_state): Added to initiate a request for the editor tab to change focus. (file_editor_tab::editor_state_changed): Added arguments to pass the copy status and the directory path so that editor doesn't have to call functions for such information. (file_editor::handle_editor_state_changed): Add copying directory of the file_editor_tab to the current editing directory. (file_editor::check_conflict_save, file_editor_tab::editor_check_conflict_save, file_editor_tab::save_file_as, file_editor_tab::handle_save_file_as_answer): Moved a portion of the save-file-as dialog mechanism to the file_editor where all file names can be obtained to check for conflict with already open files. The new signal indicates to the editor that a name check be done, and in turn the editor signals the tab to save the file. * main-window.cc, file-editor.cc, file-editor.h, file-editor-interface.h (file_editor::terminal, file_editor : public file_editor_interface, file_editor_interface : public QDockWidget): Since file_editor_tab no longer looks up to main_window, remove _main_window and _terminal from file_editor and file_editor_interface, as well as file_editor::terminal. * file-editor-tab.cc (file_editor_tab::file_has_changed): Make the dialog boxes non-modal and use slots to handle user answers. (file_editor_tab::closeEvent): Remove portion that accesses upper hierarchy member functions, can find better approaches. (file_editor_tab::file_editor_tab): Make there no parent for QsciScintilla so that window modality can be set to individual editor. * file-editor-tab.cc, file-editor.cc (file_editor_tab::load_file): Use show() member rather than exec() and set modality to window so that rest of application may function. Return a QString with message rather than a boolean. * file-editor-tab.cc, (file_editor_tab::file_has_changed): Remove static variable alreadyAsking. Multiple file_editor_tabs are using this code so do not want to block recognition of multiple file having changed on disk (bug #37406). Instead, simply stop tracking via the file watcher. (file_editor_tab::save_file, file_editor_tab::save_file_as, file_editor_tab::handle_save_file_as_answer, file_editor_tab::handle_save_file_as_answer_close): Added a remove_on_success variable. Changed the QFileDialog to WindowModal and created slots to handle file selected signal and finished signal. Signal/slot connects vary based upon remove_on_success setting. (file_editor_tab::check_file_modified): Changed the QFileDialog to NonModal and attach some slots. Editor tab can't be parent in case deleted, so use read-only state of the editor area. * file-editor-tab.h (file_editor_tab : public QWidget): New signals for file_editor for tab and file name management. (file_editor_tab::get_file_name): Delete. * file-editor.h (file_editor : public file_editor_interface): Make QStringList sessionFileNames a member of file_editor so that it can retain data between file_editor_tab signals. Also can be used for checking precense of filenames and prevent opening multiple copies (bug #36869) Added signals for file editor tabs--settings_changed, fetab_close_request, and query_file_name. Three new slots for tab and file name management. * file-editor-interface.h, file-editor.h (file_editor_interface::add_file_editor_tab, file_editor::add_file_editor_tab): Made the text name for the tab an input variable. * file-editor.cc (file_editor::~file_editor): Replace dynamic_cast with simple signal querying all file editor tabs for file names which end up in savedSessionTabs. (file_editor::handle_file_name_changed): Dynamic cast not necessary since QObject and QWidget are compatible. (file_editor::handle_tab_close_request): Replace dynamic_cast with signal to request file_editor_tab with associated tabID tag should close. (file_editor::handle_tab_remove_request): Rename of handle_tab_close_request. Instead of dynamic cast, loop through pointers comparing QWidget* to QObject*, if same tag remove tab via index and also delete which fixes a memory leak. (file_editor::handle_add_filename_to_list): Simple slot that uses append() of the list member functions. (file_editor::notice_settings): Rather than dynamic cast, emit signal for the file_editor_tabs. (file_editor::add_file_editor_tab): New variety of connections for improved flow. (file_editor::request_open_file): Given error messages are made WindowModal, the tab shouldn't be delete if file open is not successful. The file_editor_tab takes care of that. (file_editor::request_open_file): Added check and message box for the requested file already open in editor. For the non-interactive overloaded version, open a message dialog box to tell the user file not found, e.g., could not find file in the settings when launched. (file_editor::request_open_file): Inquire file names and update list before checking for existence of files. Supply empty title to editor tab then have file_editor_tab update name. * file-editor-tab.h, file-editor-tab.cc, file-editor.cc (file_editor_tab::run_file): New signal process_octave_code. (file_editor::add_file_editor_tab): Connect signal process_octave_code to file_editor's parent's slot handle_command_double_clicked.

## Copyright (C) 2010-2012 Kai Habel
##
## 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/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {[@var{fname}, @var{fpath}, @var{fltidx}] =} uiputfile ()
## @deftypefnx {Function File} {[@var{fname}, @var{fpath}, @var{fltidx}] =} uiputfile (@var{flt})
## @deftypefnx {Function File} {[@var{fname}, @var{fpath}, @var{fltidx}] =} uiputfile (@var{flt}, @var{dialog_name})
## @deftypefnx {Function File} {[@var{fname}, @var{fpath}, @var{fltidx}] =} uiputfile (@var{flt}, @var{dialog_name}, @var{default_file})
## Open a GUI dialog for selecting a file.  @var{flt} contains a (list of) file
## filter string(s) in one of the following formats:
##
## @table @code
## @item "/path/to/filename.ext"
## If a filename is given the file extension is
## extracted and used as filter.
## In addition the path is selected as current path and the filename is selected
## as default file.
## Example: uiputfile ("myfun.m");
##
## @item "*.ext"
## A single file extension.
## Example: uiputfile ("*.ext");
##
## @item @{"*.ext","My Description"@}
## A 2-column cell array containing the file extension in the 1st column and
## a brief description in the 2nd column.
## Example: uiputfile (@{"*.ext","My Description";"*.xyz","XYZ-Format"@});
## @end table
##
## The filter string can also contain a semicolon separated list of filter
## extensions.
## Example: uiputfile (@{"*.gif;*.png;*.jpg", "Supported Picture Formats"@});
##
## @var{dialog_name} can be used to customize the dialog title.
## If @var{default_file} is given it is preselected in the GUI dialog.
## If, in addition, a path is given it is also used as current path.
## @seealso{uigetfile, uigetdir}
## @end deftypefn

## Author: Kai Habel

function [retfile, retpath, retindex] = uiputfile (varargin)

  defaulttoolkit = get (0, "defaultfigure__graphics_toolkit__");
  funcname = ["__uiputfile_", defaulttoolkit, "__"];
  functype = exist (funcname);
  if (! __is_function__ (funcname))
    funcname = "__uiputfile_fltk__";
    if (! __is_function__ (funcname))
      error ("uiputfile: fltk graphics toolkit required");
    elseif (! strcmp (defaulttoolkit, "gnuplot"))
      warning ("uiputfile: no implementation for toolkit '%s', using 'fltk' instead",
               defaulttoolkit);
    endif
  endif

  if (nargin > 3)
    print_usage ();
  endif

  defaultvals = {cell(0, 2),     # File Filter
                 "Save File",    # Dialog Title
                 "",             # Default file name
                 [240, 120],     # Dialog Position (pixel x/y)
                 "create",
                 pwd};           # Default directory

  outargs = cell (6, 1);
  for i = 1 : 6
    outargs{i} = defaultvals{i};
  endfor

  if (nargin > 0)
    file_filter = varargin{1};
    [outargs{1}, outargs{3}, defdir] = __file_filter__ (file_filter);
    if (length (defdir) > 0)
      outargs{6} = defdir;
    endif
  else
    outargs{1} = __file_filter__ (outargs{1});
  endif

  if (nargin > 1)
    if (ischar (varargin{2}))
      outargs{2} = varargin{2};
    elseif (! isempty (varargin{2}))
      print_usage ();
    endif
  endif

  if (nargin > 2)
    if (ischar (varargin{3}))
      [fdir, fname, fext] = fileparts (varargin{3});
      if (! isempty (fdir))
        outargs{6} = fdir;
      endif
      if (! isempty (fname) || ! isempty (fext))
        outargs{3} = strcat (fname, fext);
      endif
    elseif (! isempty (varargin{3}))
      print_usage ();
    endif
  endif

  [retfile, retpath, retindex] = feval (funcname, outargs{:});

endfunction


%!demo
%! uiputfile ({'*.gif;*.png;*.jpg', 'Supported Picture Formats'});

## Remove from test statistics.  No real tests possible.
%!assert (1)