wallet/frame.h

#pragma once
template  <typename handler_class>
//	This class exists to record the needed to unbind a drop down menu action and delete
//	the corresponding item from the drop down menu when the handler is destroyed. 
//	(Because the handler is a method of an object that is about to be destroyed.)
//	Also avoids the need for manually creating a new windowid to link each additional bind
//	to each menu item, thus avoids the likelihood of mismatching binds and menu entries.
class MenuLink {
	void (handler_class::* m_method)(wxCommandEvent&);
	int m_winid;
	handler_class* m_handler = nullptr;
	wxMenu* m_menu =nullptr;
	wxMenuItem* m_menuItem = nullptr;;
public:
	MenuLink(
		void (handler_class::* method)(wxCommandEvent&)) : m_method{ method }, m_winid{ wxWindow::NewControlId()} {}
	MenuLink(
		void (handler_class::* method)(wxCommandEvent&), MyIDs winid) : m_method{ method }, m_winid{ winid } {}
	~MenuLink() {
		if (m_menu != nullptr) {
			m_menu->Unbind(wxEVT_MENU, m_method, m_handler, m_winid);
			m_menu->Destroy(m_menuItem);
		}
	}
	auto Append(
		wxMenu* menu,
		handler_class* handler,
		const wxString& item = wxEmptyString,
		const wxString& helpString = wxEmptyString
	) {
		m_menu = menu;
		m_handler = handler;
		m_menuItem = menu->Append(m_winid, item, helpString);
		menu->Bind(wxEVT_MENU, m_method, handler, m_winid);
		return m_menuItem;
	}
	void queue_event() {
		if (m_menu != nullptr) {
			auto event = new wxCommandEvent(wxEVT_MENU, m_winid);
			wxQueueEvent(m_menu, event);
		}
		else throw MyException("Event sent to uninitialized Menu item");
	}
};

class Frame : public wxFrame
{
public:
	wxLogWindow*m_pLogWindow{ nullptr };
	std::unique_ptr<wxLogNull>m_pLogNull{ nullptr };
	Frame(wxString);
	~Frame();
	wxFileName m_LastUsedSqlite;
private:
	typedef MenuLink<Frame> MenuLink;
	wxPanel* m_panel;	//The once current child panel.
	void StorePositionToConfig(void);
	void RestorePositionFromConfig(const wxSize&);
	void OnExit(wxCommandEvent&);
	void OnClose(wxCloseEvent&);
	void OnAbout(wxCommandEvent&);
	void OnDeleteConfiguration(wxCommandEvent&);
public:
	void OnSaveNew(wxCommandEvent&);
	void NewWalletNewSecret(wxCommandEvent&);
	void RecreateWalletFromExistingSecret(wxCommandEvent&);
	void OnFileOpen(wxCommandEvent&);
private:
	void OnDelete(wxCommandEvent&);
	void OnMenuOpen(wxMenuEvent&);
	void OnDeleteSubwindow(wxCommandEvent&);
	MenuLink menu_OnDeleteSubwindow =
		MenuLink(&Frame::OnDeleteSubwindow);
	void OnDeleteLastSubwindow(wxCommandEvent&);
	void OnAddSubwindow(wxCommandEvent&);
public:
	void OnFirstUse(wxCommandEvent&);

public:
//	MenuLink menu_OnFirstUse =
//		MenuLink(&Frame::OnFirstUse, myID_WELCOME_TO_ROCOIN);
};
inline Frame* singletonFrame(nullptr);