koffice/kexi/widget/utils/kexiarrowtip.cpp

/* This file is part of the KDE project
   Copyright (C) 2006 Jaroslaw Staniek <js@iidea.pl>

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this program; see the file COPYING.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/

#include "kexiarrowtip.h"

#include <qpixmap.h>
#include <qbitmap.h>
#include <qpainter.h>
#include <qimage.h>
#include <qtooltip.h>
#include <qfont.h>
#include <qfontmetrics.h>
#include <qtimer.h>

#include <kexiutils/utils.h>

KexiArrowTip::KexiArrowTip(const QString& text, QWidget* parent)
 : KexiToolTip(text, parent)
 , m_opacity(0.0)
{
	QPalette pal( palette() );
	QColorGroup cg(pal.active());
	cg.setColor(QColorGroup::Foreground, Qt::red);
	pal.setActive(cg);
	setPalette(pal);

	QFontMetrics fm(font());
	QSize sz(fm.boundingRect(m_value.toString()).size());
	sz += QSize(14, 10); //+margins
	m_arrowHeight = sz.height()/2;
	sz += QSize(0, m_arrowHeight); //+arrow height
	resize(sz);

	setAutoMask( false );

	//generate mask
	QPixmap maskPm(size());
	maskPm.fill( black );
	QPainter maskPainter(&maskPm);
	drawFrame(maskPainter);
	QImage maskImg( maskPm.convertToImage() );
	QBitmap bm;
	bm = maskImg.createHeuristicMask();
	setMask( bm );
}

KexiArrowTip::~KexiArrowTip()
{
}

void KexiArrowTip::show()
{
	if (isVisible())
		return;

	m_opacity = 0.0;
	setWindowOpacity(0.0);
	KexiToolTip::show();
	increaseOpacity();
}

void KexiArrowTip::hide()
{
	if (!isVisible())
		return;

	decreaseOpacity();
}

void KexiArrowTip::increaseOpacity()
{
	m_opacity += 0.10;
	setWindowOpacity(m_opacity);
	if (m_opacity < 1.0)
		QTimer::singleShot(25, this, SLOT(increaseOpacity()));
}

void KexiArrowTip::decreaseOpacity()
{
	if (m_opacity<=0.0) {
		KexiToolTip::close();
		m_opacity = 0.0;
		return;
	}
	m_opacity -= 0.10;
	setWindowOpacity(m_opacity);
	QTimer::singleShot(25, this, SLOT(decreaseOpacity()));
}

bool KexiArrowTip::close ( bool alsoDelete )
{
	if (!isVisible()) {
		return KexiToolTip::close(alsoDelete);
	}
	if (m_opacity>0.0)
		decreaseOpacity();
	else
		return KexiToolTip::close(alsoDelete);
	return m_opacity<=0.0;
}

void KexiArrowTip::drawContents(QPainter& p)
{
	p.setPen( QPen(palette().active().foreground(), 1) );
	p.drawText(QRect(0,m_arrowHeight,width(),height()-m_arrowHeight), 
		Qt::AlignCenter, m_value.toString());
}

void KexiArrowTip::drawFrame(QPainter& p)
{
	QPen pen(palette().active().foreground(), 1, Qt::SolidLine, Qt::SquareCap, Qt::MiterJoin);
	p.setPen( pen );
	/*
	   /\
	 +-  -----+
	 |  text  |
	 +--------+
	*/
	//1st line
	const int arrowOffset = 5; //5 pixels to right
	QPointArray pa(8);
	pa.setPoint(0, 0, m_arrowHeight-1);
	pa.setPoint(1, 0, height()-1);
	pa.setPoint(2, width()-1, height()-1);
	pa.setPoint(3, width()-1, m_arrowHeight-1);
	pa.setPoint(4, arrowOffset+m_arrowHeight+m_arrowHeight-2, m_arrowHeight-1);
	pa.setPoint(5, arrowOffset+m_arrowHeight-1, 0);
	pa.setPoint(6, arrowOffset, m_arrowHeight-1);
	pa.setPoint(7, 0, m_arrowHeight-1);
	p.drawPolyline(pa);
	//-2nd, internal line
	pa.resize(12);
	pa.setPoint(0, 1, m_arrowHeight);
	pa.setPoint(1, 1, height()-2);
	pa.setPoint(2, width()-2, height()-2);
	pa.setPoint(3, width()-2, m_arrowHeight);
	pa.setPoint(4, arrowOffset+m_arrowHeight+m_arrowHeight-2, m_arrowHeight);
	pa.setPoint(5, arrowOffset+m_arrowHeight-1, 1);
	pa.setPoint(6, arrowOffset, m_arrowHeight);
	pa.setPoint(7, 0, m_arrowHeight);
	pa.setPoint(8, arrowOffset+1, m_arrowHeight);
	pa.setPoint(9, arrowOffset+m_arrowHeight-1, 2);
	pa.setPoint(10, arrowOffset+m_arrowHeight+m_arrowHeight-3, m_arrowHeight);
	pa.setPoint(11, width()-2, m_arrowHeight);
	p.drawPolyline(pa);
}

#include "kexiarrowtip.moc"