init commit

mainwindow.h

@@ -0,0 +1,39 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class MainWindow; }
+
+class QPropertyAnimation;
+QT_END_NAMESPACE
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow() override;
+
+protected:
+    void closeEvent(QCloseEvent *) override;
+    void paintEvent(QPaintEvent *e) override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+
+private slots:
+    void on_closeWindowBtn_clicked();
+
+private:
+    QPoint m_oldMousePos;
+    bool m_clickedOnWindow = false;
+    QLinearGradient m_bgLinearGradient;
+
+    Ui::MainWindow *ui;
+
+    QPropertyAnimation *m_fadeOutAnimation;
+};
+#endif // MAINWINDOW_H