gui: add basic gui code.

Gui/GuiUtil/Public.cpp

@@ -0,0 +1,42 @@
+#include "Public.h"
+
+#include <QFileDialog>
+#include <QMessageBox>
+
+void FTCommon::msg(QWidget* parent, const QString& content)
+{
+    QMessageBox::information(parent, QObject::tr("prompt"), content);
+}
+
+bool FTCommon::affirm(QWidget* parent, const QString& titile, const QString& content)
+{
+    QMessageBox questionBox(parent);
+    questionBox.setText(content);
+    questionBox.setWindowTitle(titile);
+    questionBox.setIcon(QMessageBox::Question);
+    questionBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
+    int result = questionBox.exec();
+    if (result != QMessageBox::Yes) {
+        return false;
+    } else {
+        return true;
+    }
+}
+
+QString FTCommon::select_file(QWidget* parent, const QString& info, const QString& filter)
+{
+    QString filePath = QFileDialog::getOpenFileName(parent, info, QDir::homePath(), filter);
+    return filePath;
+}
+
+QString FTCommon::GetAppPath()
+{
+    QString home = QDir::homePath();
+    QDir dir(home);
+    auto ret_path = dir.absoluteFilePath(".config/frelayGUI");
+    QDir d(ret_path);
+    if (!d.exists()) {
+        d.mkpath(ret_path);
+    }
+    return ret_path;
+}