wallet/frame.h

#pragma once
template  <typename T>
//	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 {
	typedef void (T::* method_handler)(wxCommandEvent&);
	// (thing.*p)(args) is how you use a pointer to method
	T* m_handler = nullptr;
	method_handler m_method;
	int m_winid;
	wxMenu* m_menu = nullptr;
	wxMenuItem* m_menuItem = nullptr;
public:
	MenuLink() = delete;
	MenuLink(const MenuLink&) = default;
	MenuLink(const MenuLink&&) = delete;
	MenuLink& operator=(const MenuLink&) = delete;
	MenuLink& operator=(MenuLink&) = delete;
	MenuLink(T* handler, method_handler method) :
		m_handler(handler), m_method{ method }, m_winid{ wxWindow::NewControlId() }{}
	MenuLink(T* handler, method_handler method, MyIDs winid) :
		m_handler(handler), 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);
		}
	}
	wxMenuItem* Insert(
		wxMenu* menu,
		size_t pos,
		const wxString& item,
		const wxString& help = wxEmptyString
	) {
		if (m_menu == nullptr) m_menu = menu;
		else {
			assert(false);
			throw MyException("Reinsertion of menu item");
		}
		m_menuItem = menu->Insert(pos, m_winid, item, help);
		menu->Bind(wxEVT_MENU, m_method, m_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 {
			assert(false);
			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;
	wxPanel* m_panel{nullptr};	//The once current child panel.
private:
	typedef MenuLink<Frame> MenuLink;
	void StorePositionToConfig(void);
	void RestorePositionFromConfig(const wxSize&);
	void OnExit(wxCommandEvent&);
	void OnClose(wxCloseEvent&);
	void OnAbout(wxCommandEvent&);
	void OnDeleteConfiguration(wxCommandEvent&);
	void OnMyCloseMpanel(wxCommandEvent&);

public:
	void OnSaveNew(wxCommandEvent&);
	void NewWalletNewSecret(wxCommandEvent&);
	void RecreateWalletFromExistingSecret(wxCommandEvent&);
	void OnFileOpen(wxCommandEvent&);

private:
	void OnDelete(wxCommandEvent&);
	void OnMenuOpen(wxMenuEvent&);
public:
	void OnFirstUse(wxCommandEvent&);

public:
//	MenuLink menu_OnFirstUse =
//		MenuLink(&Frame::OnFirstUse, myID_WELCOME_TO_ROCOIN);
};

extern Frame* singletonFrame;