add new QtFileDialog to avoid using Nasal in file selectors

(and hence avoid applying Nasal security rules to them)

src/GUI/CMakeLists.txt

@@ -106,6 +106,8 @@ if (HAVE_QT)
                             LocationWidget.hxx
                             QtMessageBox.cxx
                             QtMessageBox.hxx
+                            QtFileDialog.cxx
+                            QtFileDialog.hxx
                             ${uic_sources}
                             ${qrc_sources})
 

src/GUI/FileDialog.cxx

@@ -41,6 +41,9 @@
 #if defined(SG_WINDOWS)
     #include "WindowsFileDialog.hxx"
 #endif
+#if defined(HAVE_QT)
+    #include "QtFileDialog.hxx"
+#endif
 
 FGFileDialog::FGFileDialog(Usage use) :
     _usage(use),
@@ -148,6 +151,8 @@ static naRef f_createFileDialog(const nasal::CallContext& ctx)
     FileDialogPtr fd(new CocoaFileDialog(usage));
 #elif defined(SG_WINDOWS)
 	FileDialogPtr fd(new WindowsFileDialog(usage));
+#elif defined(HAVE_QT)
+    FileDialogPtr fd(new QtFileDialog(usage));
 #else
     FileDialogPtr fd(new PUIFileDialog(usage));
 #endif

src/GUI/QtFileDialog.cxx

@@ -0,0 +1,79 @@
+// QtFileDialog.cxx - Qt5 implementation of FGFileDialog
+//
+// Written by Rebecca Palmer, started February 2016.
+//
+// Copyright (C) 2015 Rebecca Palmer <rebecca_palmer@zoho.com>
+//
+// This program 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 2 of the
+// License, or (at your option) any later version.
+//
+// This program 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 this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#include "QtFileDialog.hxx"
+#include "QtLauncher.hxx"
+#include <simgear/debug/logstream.hxx>
+
+// Qt
+#include <QFileDialog>
+#include <QString>
+#include <QStringList>
+
+QtFileDialog::QtFileDialog(FGFileDialog::Usage use) :
+    FGFileDialog(use)
+{
+
+}
+
+QtFileDialog::~QtFileDialog() {}
+
+void QtFileDialog::exec()
+{
+    int fakeargc = 1;
+    static char fakeargv0[] = "fgfs";
+    static char * fakeargv[2] = {fakeargv0, 0};
+    // This does nothing if it has already been run, so the fake argc/argv
+    // are only used if run without launcher
+    flightgear::initApp(fakeargc, fakeargv);
+    
+    // concatenate filter patterns, as Qt uses a single string
+    std::string filter="";
+    for( string_list::const_iterator it = _filterPatterns.begin(); it != _filterPatterns.end();++it ) {
+        if(!filter.empty()){
+            filter=filter+" ";
+        }
+        filter=filter+*it;
+    }
+    QFileDialog dlg(0,QString::fromStdString(_title),QString::fromStdString(_initialPath.str()),QString::fromStdString(filter));
+    if (_usage==USE_SAVE_FILE) {
+        dlg.setAcceptMode(QFileDialog::AcceptSave);
+    }
+    if (_usage==USE_CHOOSE_DIR) {
+        dlg.setFileMode(QFileDialog::Directory);
+    }
+    if (_usage==USE_OPEN_FILE) {
+        dlg.setFileMode(QFileDialog::ExistingFile);
+    }
+    dlg.setLabelText(QFileDialog::Accept,QString::fromStdString(_buttonText));
+    dlg.selectFile(QString::fromStdString(_placeholder));
+    if(_showHidden){
+        SG_LOG(SG_GENERAL, SG_ALERT, "QtFileDialog: can't show hidden files in Qt");
+    }
+    if(dlg.exec()){
+        QStringList result = dlg.selectedFiles();
+        if(!(result.isEmpty())){
+            _callback->onFileDialogDone(this, SGPath(result[0].toStdString()));
+        }
+    }
+}
+
+void QtFileDialog::close(){}
+

src/GUI/QtFileDialog.hxx

@@ -0,0 +1,16 @@
+#ifndef FG_QT_FILE_DIALOG_HXX
+#define FG_QT_FILE_DIALOG_HXX 1
+
+#include <GUI/FileDialog.hxx>
+
+class QtFileDialog : public FGFileDialog
+{
+public:
+    QtFileDialog(FGFileDialog::Usage use);
+
+    virtual ~QtFileDialog();
+    
+    virtual void exec();
+    virtual void close();
+};
+#endif