lyx_mirror/src/frontends/qt2/qscreen.h

// -*- C++ -*-
/**
 * \file qscreen.h
 * Copyright 2002 the LyX Team
 * Read the file COPYING
 *
 * \author John Levon <moz@compsoc.man.ac.uk>
 */

#ifndef QSCREEN_H
#define QSCREEN_H

#ifdef __GNUG__
#pragma interface
#endif

#include <boost/smart_ptr.hpp>
 
#include "screen.h"
#include "QWorkArea.h"
 
#include <qrect.h>
 
/**
 * Qt implementation of toolkit-specific parts of LyXScreen.
 */
class QScreen : public LyXScreen {
public:
	QScreen(QWorkArea &);

	virtual ~QScreen();

	/**
	 * draw the screen from a given position
	 * @param y the text position to draw from
	 *
	 * Uses as much of the already printed pixmap as possible 
	 */
	virtual void draw(LyXText *, BufferView *, unsigned int y);
 
	/**
	 * showManualCursor - display the caret on the work area
	 * @param text the lyx text containing the cursor
	 * @param x the x position of the cursor
	 * @param y the y position of the row's baseline
	 * @param asc ascent of the row
	 * @param desc descent of the row
	 * @param shape the current shape
	 */
	virtual void showManualCursor(LyXText const *, int x, int y,
			      int asc, int desc,
			      Cursor_Shape shape);
	
	/// unpaint the cursor painted by showManualCursor()
	virtual void hideCursor();
 
protected:
	/// get the work area
	virtual WorkArea & workarea() const { return owner_; }
 
	/// copies specified area of pixmap to screen
	virtual void expose(int x, int y, int exp_width, int exp_height); 

private:
	/// our owning widget
	QWorkArea & owner_;
 
	/// the mini-pixmap used for backing store for the blinking cursor
	boost::scoped_ptr<QPixmap> nocursor_pixmap_;

	//{@ the cursor pixmap position/size
	int cursor_x_;
	int cursor_y_;
	int cursor_w_;
	int cursor_h_;
	//@}
};

#endif // QSCREEN_H