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) 2007-2012 John W. Eaton
##
## 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{azimuth}, @var{elevation}] =} view ()
## @deftypefnx {Function File} {} view (@var{azimuth}, @var{elevation})
## @deftypefnx {Function File} {} view ([@var{azimuth} @var{elevation}])
## @deftypefnx {Function File} {} view ([@var{x} @var{y} @var{z}])
## @deftypefnx {Function File} {} view (@var{dims})
## @deftypefnx {Function File} {} view (@var{ax}, @dots{})
## Query or set the viewpoint for the current axes.  The parameters
## @var{azimuth} and @var{elevation} can be given as two arguments or as
## 2-element vector.
## The viewpoint can also be given with Cartesian coordinates @var{x},
## @var{y}, and @var{z}.
## The call @code{view (2)} sets the viewpoint to @var{azimuth} = 0
## and @var{elevation} = 90, which is the default for 2-D graphs.
## The call @code{view (3)} sets the viewpoint to @var{azimuth} = -37.5
## and @var{elevation} = 30, which is the default for 3-D graphs.
## If @var{ax} is given, the viewpoint is set for this axes, otherwise
## it is set for the current axes.
## @end deftypefn

## Author: jwe

function [azimuth, elevation] = view (varargin)

  if (nargin < 4)
    if (nargin == 0)
      args = {get(gca (), "view")};
    else
      ax = varargin{1};
      if (ishandle (ax) && strcmp (get (ax, "type"), "axes"))
        args = varargin(2:end);
      else
        ax = gca;
        args = varargin;
      endif
    endif
    if (length (args) == 1)
      x = args{1};
      if (length (x) == 2)
        az = x(1);
        el = x(2);
      elseif (length (x) == 3)
        [az, el] = cart2sph (x(1), x(2), x(3));
        az *= 180/pi;
        az += 90;
        el *= 180/pi;
      elseif (x == 2)
        az = 0;
        el = 90;
      elseif (x == 3)
        az = -37.5;
        el = 30;
      else
        print_usage ();
      endif
    elseif (length (args) == 2)
      az = args{1};
      el = args{2};
    endif

    if (nargin > 0)
      set (ax, "view", [az, el]);
    endif

    if (nargout == 1)
      error ("view: T = view () not implemented");
    endif

    if (nargout == 2)
      azimuth = az;
      elevation = el;
    endif
  else
    print_usage ();
  endif

endfunction


%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%!   plot3 ([0,1], [0,1], [0,1]);
%!   [az, el] = view;
%!   assert ([az, el], [-37.5, 30], eps);
%!   view (2);
%!   [az, el] = view;
%!   assert ([az, el], [0, 90], eps);
%!   view ([1 1 0]);
%!   [az, el] = view;
%!   assert ([az, el], [135, 0], eps);
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect

%!test
%! hf = figure ("visible", "off");
%! unwind_protect
%!   line;
%!   [az, el] = view;
%!   assert ([az, el], [0, 90], eps);
%!   view (3);
%!   [az, el] = view;
%!   assert ([az, el], [-37.5, 30], eps);
%! unwind_protect_cleanup
%!   close (hf);
%! end_unwind_protect