// -*- C++ -*-
/**
 * \file QDialogView.h
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Angus Leeming
 *
 * Full author contact details are available in file CREDITS.
 */

#ifndef QDIALOGVIEW_H
#define QDIALOGVIEW_H

#include "Dialog.h"

#include <boost/scoped_ptr.hpp>

#include <QApplication>
#include <QDialog>
#include <QObject>

namespace lyx {
namespace frontend {

class Qt2BC;

/** This class is an Qt2 GUI base class.
 */
class QDialogView : public QObject, public Dialog::View {
	Q_OBJECT
public:
	///
	QDialogView(Dialog &, docstring const &);
	///
	virtual ~QDialogView() {}
	///
	bool readOnly() const;

	/// the dialog has changed contents
	virtual void changed();

	///
	Qt2BC & bcview();

protected:
	/// build the actual dialog
	virtual void build_dialog() = 0;
	///
	virtual void build() = 0;
	/// Hide the dialog.
	virtual void hide();
	/// Create the dialog if necessary, update it and display it.
	virtual void show();
	/// update the dialog's contents
	virtual void update_contents() = 0;
	///
	virtual bool isVisible() const;

	/// is the dialog currently valid ?
	virtual bool isValid();

	/// are we updating ?
	bool updating_;

public Q_SLOTS:
	// dialog closed from WM
	void slotWMHide();

	// Restore button clicked
	void slotRestore();

	// OK button clicked
	void slotOK();

	// Apply button clicked
	void slotApply();

	// Close button clicked
	void slotClose();
private:
	/// Pointer to the actual instantiation of the Qt dialog
	virtual QDialog * form() const = 0;
};


template <class GUIDialog>
class QView: public QDialogView {
protected:
	QView(Dialog &, docstring const &);

	/// update the dialog
	virtual void update();

	/// Build the dialog
	virtual void build();

	/// Pointer to the actual instantiation of the Qt dialog
	virtual QDialog * form() const;

	/// Real GUI implementation.
	boost::scoped_ptr<GUIDialog> dialog_;

};


template <class GUIDialog>
QView<GUIDialog>::QView(Dialog & p, docstring const & t)
	: QDialogView(p, t)
{}


template <class GUIDialog>
QDialog * QView<GUIDialog>::form() const
{
	/* Brain dead MSVC compiler wants to know the class hierarchy at the
	   definition site of the template, rather than the instantation point
	   to downcast correctly. So, rather than including all dialogs to
	   provide that, we just cast it with the ugly hammer. */
	return (QDialog *) dialog_.get();
}


template <class GUIDialog>
void QView<GUIDialog>::update()
{
	form()->setUpdatesEnabled(false);

	// protect the BC from unwarranted state transitions

	updating_ = true;
	update_contents();
	updating_ = false;

	form()->setUpdatesEnabled(true);
	form()->update();
}


template <class GUIDialog>
void QView<GUIDialog>::build()
{
	// protect the BC from unwarranted state transitions

	updating_ = true;
	build_dialog();
	updating_ = false;
}


template <class Controller, class Base>
class QController: public Base
{
protected:
	///
	QController(Dialog &, docstring const &);
public:
	/// The parent controller
	Controller & controller();
	/// The parent controller
	Controller const & controller() const;
};


template <class Controller, class Base>
QController<Controller, Base>::QController(Dialog & p, docstring const & t)
	: Base(p, t)
{}


template <class Controller, class Base>
Controller & QController<Controller, Base>::controller()
{
	return static_cast<Controller &>(this->getController());
}


template <class Controller, class Base>
Controller const & QController<Controller, Base>::controller() const
{
	return static_cast<Controller const &>(this->getController());
}

} // namespace frontend
} // namespace lyx

#endif // QDIALOGVIEW_H