Store MainWindow instance in itself

agui2/src/MainWindow.cpp

@@ -19,11 +19,16 @@
 #include <Models/AlgorithmModelBox.hpp>
 #include <Models/OutputModelBox.hpp>
+MainWindow* MainWindow::instance = nullptr;
+
 MainWindow::MainWindow()
     : ui(new Ui::MainWindow)
     , scene(new GraphicsScene(this))
     , algorithmModel(std::make_unique<QStandardItemModel>())
 {
+    Q_ASSERT(MainWindow::instance == nullptr);
+    MainWindow::instance = this;
+
     ui->setupUi(this);
     ui->graphicsView->setScene(this->scene.get());
@@ -68,3 +73,7 @@ void MainWindow::on_AddInputBtn_clicked()
     qreal y = qrand() % 4 * 100;
     this->scene->addItem(new InputGraphicsBox(std::make_unique<InputModelBox>(), {0, y}));
 }
+
+MainWindow* MainWindow::getInstance() {
+    return instance;
+}

agui2/src/MainWindow.hpp

@@ -20,6 +20,8 @@ class MainWindow : public QMainWindow
 public:
     explicit MainWindow();
+    static MainWindow* getInstance();
+
 private:
     void displayError(const QString& text) const;
@@ -32,6 +34,8 @@ private:
     std::unique_ptr<GraphicsScene> scene;
     std::unique_ptr<QStandardItemModel> algorithmModel;
     GraphicsBox* outputBox;
+
+    static MainWindow* instance;
 };