split switcher and traverser to prepare for shuffle mode

src/pathtraverser.cpp

@@ -0,0 +1,55 @@
+#include "pathtraverser.h"
+#include "mainwindow.h"
+#include <QDirIterator>
+#include <QTimer>
+#include <QApplication>
+#include <QDir>
+#include <iostream>
+#include <stdlib.h>     /* srand, rand */
+
+PathTraverser::PathTraverser(const std::string path):
+  path(path)
+{}
+
+PathTraverser::~PathTraverser() {}
+
+RecursivePathTraverser::RecursivePathTraverser(const std::string path):
+  PathTraverser(path)
+{}
+
+RecursivePathTraverser::~RecursivePathTraverser() {}
+
+
+QStringList RecursivePathTraverser::getImages() const
+{
+    QDirIterator it(QString(path.c_str()), QStringList() << "*.jpg" << "*.JPG", QDir::Files, QDirIterator::Subdirectories);
+    QStringList files;
+    while (it.hasNext())
+    {
+       files.append(it.next());
+    }
+    return files;
+}
+
+const std::string RecursivePathTraverser::getImagePath(const std::string image) const
+{
+  return image;
+}
+
+DefaultPathTraverser::DefaultPathTraverser(const std::string path):
+  PathTraverser(path),
+  directory(path.c_str())
+{}
+
+DefaultPathTraverser::~DefaultPathTraverser() {}
+
+
+QStringList DefaultPathTraverser::getImages() const
+{
+  return directory.entryList(QStringList() << "*.jpg" << "*.JPG", QDir::Files);
+}
+
+const std::string DefaultPathTraverser::getImagePath(const std::string image) const
+{
+  return directory.filePath(QString(image.c_str())).toStdString();
+}