Add questdlg dialog function and fix variety of dialog bugs. * octave-qt-link.cc (octave_qt_link::do_message_dialog): Change initializer from QString to QString::fromStdString(dlg). (octave_qt_link::do_question_dialog): New function. Make all buttons AcceptRole. Signal dialog creation. Go to wait state. Get dialog button result when awakened. (octave_qt_link::do_list_dialog): Change std string 'prompt_string' to std list of std string 'prompt'. Use make_qstring_list(prompt). (octave_qt_link::do_input_dialog): Change 'nr' and 'nc' to std list of float. Use QFloatList::fromStdList(nc). * octave-qt-link.h (octave_qt_link : QObject, public octave_link): Add member do_question_dialog. (octave_qt_link::do_list_dialog): Use std list of std string for prompt. (octave_qt_link::do_input_dialog): Change 'nr' and 'nc' to std list of float. * octave-link.cc (__octave_link_question_dialog__): New builtin. Translate args to inputs of octave_link::question_dialog function. (__octave_link_list_dialog__): Retain prompt string cell list as a std list of std string. (__octave_link_input_dialog__): Make 'nr' and 'nc' std list of float. * octave-link.h (octave_link::question_dialog, octave_link::do_question_dialog): Add. (octave_link::list_dialog, octave_link::do_list_dialog): Change prompt to std list of std string. (octave_link::input_dialog, octave_link::do_input_dialog): Change 'nr' and 'nc' to std list of float. * errordlg.m (errordlg): Make retval return variable. Add "error" icon as message_dialog input. * helpdlg.m (helpdlg): Make retval return variable. Add "help" icon as message_dialog input. * warndlg.m (warndlg): Add "warn" icon as message_dialog input. * message_dialog.m (message_dialog): Define default icon "none". Use dlg variable with icon variable as input to __octave_link_message_dialog__. Use __octave_link_enabled__ rather than return value. * inputdlg.m (inputdlg): Round up rowscols to integer. Replace iscell(cstr) with __octave_link_enabled__. * listdlg.m (listdlg): Correct indentation. Change default selmode from "multiple" to "Multiple". Make default prompt {}. Check valid selmode entry. Use __octave_link_enabled__ rather than ok return value. Remove FIXME note. Use Rich Text in prompt of demo. Add demo using ListSize. * questdlg.m (questdlg): Add case 0 to switch. Add error message for default button not matching options. In all cases, check that default button matches an button option. Add __octave_link_question_dialog__ call conditioned under __octave_link_enabled__. Add three demos. * dialog.cc (QUIWidgetCreator::dialog_finished): Remove. (QUIWidgetCreator::dialog_button_clicked): Test that button pointer is nonzero. Move dialog_result assignment and waitcondition.wakeAll here. (MessageDialog::MessageDialog): If title "", change to " ". Reverse order that buttons are installed. Remove signal 'finished' connection. (ListDialog::ListDialog): Change prompt from QString to QStringList. Make list items noneditable. Add Rich Text support to prompt, place RT <br> between prompt list lines. Use label for prompt. Disable select_all button if not "Multiple". Remove horizontal group box. If title "", change to " ". (InputDialog::InputDialog): Change 'nr' and 'nc' to QFloatList. Define pre-processor variables, then undefine. If title "", change to " ". * dialog.h (QUIWidgetCreator::signal_listviewQUI, WidgetCreator::create_listview): Change QString 'prompt_string' to QStringList 'prompt'. (QUIWidgetCreator::signal_inputlayout, QUIWidgetCreator::create_inputlayout): Use QFloatList for 'nr' and 'nc'. (QUIWidgetCreator::dialog_finished): Remove. (MessageDialog::closeEvent): New override, emitting buttonClicked(0). (ListDialog::ListDialog): Change QString 'prompt_string' to QStringList 'prompt'. (InputDialog::InputDialog): Use QFloatList for 'nr' and 'nc'. * main_window.cc, main_window.h: Make function call changes that match dialog.h changes. (main_window::find_files_finished): Remove unused 'button' variable.

--- a/libinterp/interpfcn/octave-link.cc	Mon Apr 22 11:50:40 2013 -0400
+++ b/libinterp/interpfcn/octave-link.cc	Mon Apr 22 15:07:13 2013 -0400
@@ -154,6 +154,36 @@
   return retval;
 }
 
+DEFUN (__octave_link_question_dialog__, args, ,
+  "-*- texinfo -*-\n\
+@deftypefn {Built-in Function} {} __octave_link_question_dialog__ (@var{msg}, @var{title}, @var{btn1}, @var{btn2}, @var{btn3}, @var{default})\n\
+Undocumented internal function.\n\
+@end deftypefn")
+{
+  octave_value retval;
+
+  if (args.length () == 6)
+    {
+      std::string msg = args(0).string_value ();
+      std::string title = args(1).string_value ();
+      std::string btn1 = args(2).string_value ();
+      std::string btn2 = args(3).string_value ();
+      std::string btn3 = args(4).string_value ();
+      std::string btndef = args(5).string_value ();
+
+      if (! error_state)
+        {
+          flush_octave_stdout ();
+
+          retval = octave_link::question_dialog (msg, title, btn1, btn2, btn3, btndef);
+        }
+      else
+        error ("invalid arguments");
+    }
+
+  return retval;
+}
+
 DEFUN (__octave_link_list_dialog__, args, ,
   "-*- texinfo -*-\n\
 @deftypefn {Built-in Function} {} __octave_link_list_dialog__ (@var{list}, @var{mode}, @var{size}, @var{intial}, @var{name}, @var{prompt}, @var{ok_string}, @var{cancel_string})\n\
@@ -165,7 +195,7 @@
   if (args.length () == 8)
     {
       Cell list = args(0).cell_value ();
-      const Array<std::string> tlist= list.cellstr_value ();
+      const Array<std::string> tlist = list.cellstr_value ();
       octave_idx_type nel = tlist.numel ();
       std::list<std::string> list_lst;
       for (octave_idx_type i = 0; i < nel; i++)
@@ -184,7 +214,12 @@
         initial_lst.push_back (initial_matrix(i));
 
       std::string name = args(4).string_value ();
-      std::string prompt_string = args(5).string_value ();
+      list = args(5).cell_value ();
+      const Array<std::string> plist = list.cellstr_value ();
+      nel = plist.numel ();
+      std::list<std::string> prompt_lst;
+      for (octave_idx_type i = 0; i < nel; i++)
+        prompt_lst.push_back (plist(i));
       std::string ok_string = args(6).string_value ();
       std::string cancel_string = args(7).string_value ();
 
@@ -194,7 +229,7 @@
 
           std::pair<std::list<int>, int> result
             = octave_link::list_dialog (list_lst, mode, width, height,
-                                        initial_lst, name, prompt_string,
+                                        initial_lst, name, prompt_lst,
                                         ok_string, cancel_string);
 
           std::list<int> items_lst = result.first;
@@ -238,8 +273,8 @@
 
       Matrix rc = args(2).matrix_value ();
       nel = rc.rows ();
-      std::list<int> nr;
-      std::list<int> nc;
+      std::list<float> nr;
+      std::list<float> nc;
       for (octave_idx_type i = 0; i < nel; i++)
         {
           nr.push_back (rc(i,0));