Refractoring code and adding memory management

KeyManagementWindow.h

@@ -6,6 +6,8 @@
 #include<QHBoxLayout>
 #include<QComboBox>
 #include<QLineEdit>
+#include<QPushButton>
+#include<memory>
 
 class QHBoxLayout;
 class QVBoxLayout;
@@ -13,23 +15,28 @@ class QComboBox;
 class QLineEdit;
 class QPushButton;
 
+using std::unique_ptr;
+
 class KeyManagementWindow : public QDialog
 {
 	Q_OBJECT
 public:
 	KeyManagementWindow(QWidget* parent = 0);
-	~KeyManagementWindow();
+	~KeyManagementWindow() = default;
 
 	void setContentsOfComboBox();
 private slots:	
 	void test();
 	void generation();
 private:	
-	QHBoxLayout* hBox{};
-	QVBoxLayout* vBox{};
-	QComboBox* comboBoxOfKeys{};
-	QLineEdit* valueOfKey{};
-	QPushButton* generateNewDefaultKeys;
+	unique_ptr<QHBoxLayout> hBox;
+	unique_ptr<QHBoxLayout> hBox2;
+	unique_ptr<QVBoxLayout> vBox;
+	unique_ptr<QComboBox> comboBoxOfKeys;
+	unique_ptr<QLineEdit> valueOfKey;
+	unique_ptr<QPushButton> generateNewDefaultKeys;
+	int windowWidth{400};
+	int windowHeight{400};
 };
 
 #endif