#ifndef TSELECTION_H
#define TSELECTION_H

#include "menubarcommand.h"
#include "tcommon.h"

#undef DVAPI
#undef DVVAR
#ifdef TOONZQT_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

class QMenu;
class QWidget;

//=============================================================================
// TSelection
//-----------------------------------------------------------------------------

class DVAPI TSelection
{
public:
	class View
	{
	public:
		virtual ~View(){};

		virtual void onSelectionChanged() = 0;
		virtual void enableCommands() {}
	};

public:
	TSelection();
	virtual ~TSelection();

	// override this to define selection related commands
	virtual void enableCommands()
	{
		if (m_view)
			m_view->enableCommands();
	}

	// call selection handler enableCommand()
	void enableCommand(CommandId cmdId, CommandHandlerInterface *handler);

	// overridden enableCommands() will call enableCommand()
	template <class T>
	inline void enableCommand(T *target, CommandId cmdId, void (T::*method)())
	{
		enableCommand(cmdId, new CommandHandlerHelper<T>(target, method));
	}

	template <class T, typename R>
	inline void enableCommand(T *target, CommandId cmdId, void (T::*method)(R), R value)
	{
		enableCommand(cmdId, new CommandHandlerHelper2<T, R>(target, method, value));
	}

	void makeCurrent();
	void makeNotCurrent();
	static TSelection *getCurrent();
	static void setCurrent(TSelection *selection);

	virtual bool isEmpty() const = 0;
	virtual void selectNone() = 0;

	virtual bool addMenuActions(QMenu *menu) { return false; }
	void addMenuAction(QMenu *menu, CommandId cmdId);

	void setView(View *view) { m_view = view; }
	View *getView() const { return m_view; }

	void notifyView();

private:
	View *m_view;
};

#endif //TSELECTION_H