DatabaseWindow has no knowledge more of the existence of QueryTab but user can still create and use them within that window.

pglab/plugin_support/LMainWindow.h

@@ -0,0 +1,58 @@
+#ifndef LMAINWINDOW_H
+#define LMAINWINDOW_H
+
+#include <QMainWindow>
+
+class IPluginContentWidgetContext;
+class MenuAction;
+class PluginContentWidget;
+
+namespace LMainWindow_details {
+	class LMainWindowContentContext;
+}
+
+class LMainWindow : public QMainWindow {
+	Q_OBJECT
+public:
+
+	LMainWindow(QWidget *parent = nullptr);
+	~LMainWindow();
+
+	void initModuleMenus();
+	void setTabCaptionForWidget(QWidget *widget, const QString &caption, const QString &hint);
+	void setTabIcon(QWidget *widget, const QString &iconname);
+
+	/// Called when a newly created page is added to the QTabWidget
+	void addPage(PluginContentWidget* page, QString caption);
+
+	IPluginContentWidgetContext* context();
+protected:
+	QTabWidget *m_tabWidget = nullptr;
+	QToolBar *m_mainToolBar = nullptr;
+
+	// Standard menu's
+	QMenu *m_fileMenu = nullptr;
+
+	// Standard actions
+	QAction *m_closeAction = nullptr;
+
+
+	void addModuleMenuActions();
+
+	void addToolBarButtonsForPage(PluginContentWidget *page);
+	void removeToolBarButtonsForPage(PluginContentWidget *page);
+private:
+	LMainWindow_details::LMainWindowContentContext *m_context;
+	PluginContentWidget *m_previousPage = nullptr; ///< tracks which pages buttons were previously being displayed
+
+	void createActions();
+	void addMenuAction(const MenuAction &ma);
+
+private slots:
+	void actionClose_triggered();
+	void tabWidget_tabCloseRequested(int index);
+	void tabWidget_currentChanged(int index);
+};
+
+
+#endif // LMAINWINDOW_H