/**
 * \file qscreen.C
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author John Levon
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "debug.h"
#include "QWorkArea.h"
#include "qscreen.h"
#include "LColor.h"

#include <qapplication.h>

using std::endl;


namespace {

/// copy some horizontal regions about inside a pixmap
void copyInPixmap(QPixmap * p, int dest_y, int src_y, int src_w, int src_h)
{
	// bitBlt(dest, dest_x, dest_y, source, src_x, src_y, src_w, src_h)
	bitBlt(p, 0, dest_y, p, 0, src_y, src_w, src_h);
}

} // namespace anon


QScreen::QScreen(QWorkArea & o)
	: LyXScreen(), owner_(o)
{
}


QScreen::~QScreen()
{
}


WorkArea & QScreen::workarea() const
{
	return owner_;
}


void QScreen::repaint()
{
	QWidget * content = owner_.getContent();
	content->repaint(0, 0, content->width(), content->height());
}


void QScreen::expose(int x, int y, int w, int h)
{
	lyxerr[Debug::GUI] << "expose " << w << 'x' << h
		<< '+' << x << '+' << y << endl;

	owner_.getContent()->update(x, y, w, h);
}


void QScreen::showCursor(int x, int y, int h, Cursor_Shape shape)
{
	cursor_x_ = x;
	cursor_y_ = y;
	cursor_h_ = h;

	switch (shape) {
		case BAR_SHAPE:
			cursor_w_ = 1;
			break;
		case L_SHAPE:
			cursor_w_ = cursor_h_ / 3;
			break;
		case REVERSED_L_SHAPE:
			cursor_w_ = cursor_h_ / 3;
			cursor_x_ = x - cursor_w_ + 1;
			break;
	}

	if (!nocursor_pixmap_.get()
		|| cursor_w_ != nocursor_pixmap_->width()
		|| cursor_h_ != nocursor_pixmap_->height()) {
		nocursor_pixmap_.reset(new QPixmap(cursor_w_, cursor_h_));
	}

	if (!qApp->focusWidget())
		return;

	// save old area
	bitBlt(nocursor_pixmap_.get(), 0, 0, owner_.getPixmap(),
		cursor_x_, cursor_y_, cursor_w_, cursor_h_);

	Painter & pain(owner_.getPainter());
	pain.start();
	pain.line(x, y, x, y + h - 1, LColor::cursor);

	switch (shape) {
		case BAR_SHAPE:
			break;
		case REVERSED_L_SHAPE:
		case L_SHAPE:
			pain.line(cursor_x_, y + h - 1, cursor_x_ + cursor_w_ - 1,
				y + h - 1, LColor::cursor);
			break;
	}

	pain.end();

	owner_.getContent()->repaint(
		cursor_x_, cursor_y_,
		cursor_w_, cursor_h_);
}


void QScreen::removeCursor()
{
	// before first showCursor
	if (!nocursor_pixmap_.get())
		return;

	bitBlt(owner_.getPixmap(), cursor_x_, cursor_y_,
		nocursor_pixmap_.get(), 0, 0, cursor_w_, cursor_h_);

	owner_.getContent()->repaint(
		cursor_x_, cursor_y_,
		cursor_w_, cursor_h_);
}