Smarter strategy for selecting initial import/export/open/save direct…

…ories for #360

src/main/MainDirectoryPersist.cpp

@@ -7,7 +7,8 @@
 #include "MainDirectoryPersist.h"
 #include <QFileInfo>
 
-// QDir::current() gives "working directory" consistent with setting in qtcreator
+bool MainDirectoryPersist::m_setExportSave = false;
+bool MainDirectoryPersist::m_setImportOpen = false;
 QDir MainDirectoryPersist::m_directoryExportSave = QDir::current();
 QDir MainDirectoryPersist::m_directoryImportOpen = QDir::current();
 
@@ -27,10 +28,28 @@ QDir MainDirectoryPersist::getDirectoryImportOpen() const
 
 void MainDirectoryPersist::setDirectoryExportSaveFromFilename(const QString &fileName)
 {
+  m_setExportSave = true;
   m_directoryExportSave = QFileInfo(fileName).dir();
+
+  if (!m_setImportOpen) {
+
+    // Use the export directory for import since no better alternative is available
+    m_setImportOpen = true;
+    m_directoryImportOpen = m_directoryExportSave;
+
+  }
 }
 
 void MainDirectoryPersist::setDirectoryImportOpenFromFilename(const QString &fileName)
 {
+  m_setImportOpen = true;
   m_directoryImportOpen = QFileInfo(fileName).dir();
+
+  if (!m_setExportSave) {
+
+    // Use the import directory for export since no better alternative is available
+    m_setExportSave = true;
+    m_directoryExportSave = m_directoryImportOpen;
+
+  }
 }

src/main/MainDirectoryPersist.h

@@ -35,6 +35,8 @@ class MainDirectoryPersist
 private:
 
   // The directories are static so all instances of this class share the same values
+  static bool m_setExportSave;
+  static bool m_setImportOpen;
   static QDir m_directoryExportSave;
   static QDir m_directoryImportOpen;