gui: add basic gui code.

Util/Util.h

@@ -2,6 +2,7 @@
 #define UTIL_H
 
 #include <QObject>
+#include <InfoDirFile.h>
 
 class Util : public QObject
 {
@@ -14,4 +15,25 @@ public:
     static void ConsoleMsgHander(QtMsgType type, const QMessageLogContext& context, const QString& msg);
 };
 
+class DirFileHelper
+{
+public:
+    DirFileHelper() = default;
+    virtual ~DirFileHelper() = default;
+
+public:
+    QString GetErr() const;
+    void registerPathCall(const std::function<void(const QString& path)>& call);
+    void registerFileCall(const std::function<void(const DirFileInfoVec& vec)>& call);
+
+protected:
+    QString err_;
+    std::function<void(const QString& path)> pathCall_;
+    std::function<void(const DirFileInfoVec& info)> fileCall_;
+
+public:
+    virtual bool GetHome() = 0;
+    virtual bool GetDirFile(const QString& dir) = 0;
+};
+
 #endif   // UTIL_H