private void createCodeArea(final TabPane tabPane, final RailroadScrollPane<RailroadCodeArea> scrollPane,
        final File file) {
    if (file != null) {
        if (tabPane.getParent() == null && scrollPane.getRealParent() instanceof SplitPane
                && scrollPane.getRealParent().getParent() instanceof AnchorPane) {
            final var parent = (SplitPane) scrollPane.getRealParent();
            final var scrollPaneIndex = parent.getItems().indexOf(scrollPane);
            parent.getItems().remove(scrollPaneIndex);
            if (tabPane.getTabs().isEmpty()) {
                tabPane.getTabs().add(new Tab(file.getName(), scrollPane));
                scrollPane.setRealParent(tabPane);
                scrollPane.getContent().setFile(file);
                if (this.fileControllers.isEmpty()) {
                    this.fileControllers.add(new SimpleFileEditorController());
                }
                this.fileControllers.get(0).textArea = scrollPane.getContent();
            } else {
                final var controller = new SimpleFileEditorController();
                this.fileControllers.add(controller);
                final var newCodeArea = this.codeEditor.createCodeArea();
                controller.textArea = newCodeArea;
                final var newScrollPane = new RailroadScrollPane<>(newCodeArea);
                tabPane.getTabs().add(new Tab(file.getName(), newScrollPane));
                newScrollPane.setRealParent(tabPane);
                newCodeArea.setFile(file);
            }
            parent.getItems().add(scrollPaneIndex, tabPane);
        } else if (tabPane.getParent() != null && tabPane.getTabs().isEmpty()) {
            final var parent = (SplitPane) tabPane.getParent();
            final var tabPaneIndex = parent.getItems().indexOf(tabPane);
            parent.getItems().remove(tabPaneIndex);
            parent.getItems().add(tabPaneIndex, scrollPane);
            scrollPane.setRealParent(parent);
            scrollPane.getContent().setFile(file);
            if (this.fileControllers.isEmpty()) {
                this.fileControllers.add(new SimpleFileEditorController());
            }
            this.fileControllers.get(0).textArea = scrollPane.getContent();
        } else if (!tabPane.getTabs().isEmpty()) {
            final var controller = new SimpleFileEditorController();
            this.fileControllers.add(controller);
            final var newCodeArea = this.codeEditor.createCodeArea();
            controller.textArea = newCodeArea;
            final var newScrollPane = new RailroadScrollPane<>(newCodeArea);
            tabPane.getTabs().add(new Tab(file.getName(), newScrollPane));
            newScrollPane.setRealParent(tabPane);
            newCodeArea.setFile(file);
        }
    }
}