added directory browsing and icon size slider

ui/sourceiconview.cpp

@@ -0,0 +1,17 @@
+#include "sourceiconview.h"
+
+#include "panels/project.h"
+#include "project/media.h"
+#include "debug.h"
+
+SourceIconView::SourceIconView(QWidget *parent) : QListView(parent) {}
+
+void SourceIconView::mouseDoubleClickEvent(QMouseEvent *event) {
+    if (selectedIndexes().size() == 1) {
+        Media* m = project_parent->item_to_media(selectedIndexes().at(0));
+        if (m->get_type() == MEDIA_TYPE_FOLDER) {
+            setRootIndex(selectedIndexes().at(0));
+            emit changed_root();
+        }
+    }
+}

ui/sourceiconview.h

@@ -0,0 +1,18 @@
+#ifndef SOURCEICONVIEW_H
+#define SOURCEICONVIEW_H
+
+#include <QListView>
+
+class Project;
+
+class SourceIconView : public QListView {
+    Q_OBJECT
+public:
+    SourceIconView(QWidget* parent = 0);
+    Project* project_parent;
+    void mouseDoubleClickEvent(QMouseEvent *event);
+signals:
+    void changed_root();
+};
+
+#endif // SOURCEICONVIEW_H