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rationalwidget.cpp

/***************************************************************************
                          rationalwidget.h  -  paint a rational number
                             -------------------
    begin                : 2004/06/04
    copyright            : (C) 2004 by Sebastian Stein
    email                : seb.kde@hpfsc.de

    copyright            : (C) 2008 by Tadeu Araujo, tadeu.araujo@ltia.fc.unesp.br
    copyright            : (C) 2008 by Danilo Balzaque, danilo.balzaque@ltia.fc.unesp.br
    copyright            : (C) 2008 by Tiago Porangaba, tiago.porangaba@ltia.fc.unesp.br
 ***************************************************************************/

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

#include "rationalwidget.h"
#include "rationalwidget.moc"

/* these includes are needed for KDE support */
#include <kglobal.h>
#include <klocale.h>

/* these includes are needed for Qt support */
#include <qpainter.h>
#include <qstring.h>
//Added by qt3to4:
#include <QPaintEvent>

00035 RationalWidget::RationalWidget (QWidget * parent, const QString &pnumber, const int pperiodStart, const int pperiodLength) :
    FractionBaseWidget (parent), m_number (pnumber),
    m_periodStart (pperiodStart), m_periodLength (pperiodLength)
{
#ifdef DEBUG
    kDebug() << "constructor RationalWidget";
#endif
}

00044 RationalWidget::~RationalWidget()
{
#ifdef DEBUG
    kDebug() << "destructor RationalWidget";
#endif
}

00051 void RationalWidget::setRational (const QString &pnumber, const int pperiodStart, const int pperiodLength)
{
    m_number = KGlobal::locale()->formatNumber (pnumber, false, -1);
    m_periodStart = pperiodStart;
    m_periodLength = pperiodLength;

    update();

    return;
}

00062 void RationalWidget::paintEvent (QPaintEvent* /* p_paintEvent */)
{
    // our x position, we paint from left to right;
    // we don't want to start directly on the border, so add the margin
    int x_pos = _MARGIN_X;
    int y_pos = 0;
    int x_startPos = _MARGIN_X;
    bool tmp_painting = false;

    // start the painter
    QPainter paint (this);

    // ratios and operation signs are painted with the same font
    paint.setFont (m_font);

    // set the pen for painting
    QPen pen (Qt::SolidLine);
    pen.setWidth (0);
    paint.setPen (pen);

    // get the font height; the font height doesn't change while painting
    QFontMetrics fm (paint.fontMetrics());
    int fontHeight = fm.lineSpacing(); // get the font height

    // now we can correctly set the height of the widget
    setMinimumHeight (2 * fontHeight + 10);
    setMaximumHeight (2 * fontHeight + 10);

    // paint each char one by one
    for (int stringPos = 0; stringPos < m_number.length(); stringPos++) {
        // check if the period line starts over the current number
        if (m_periodLength > 0 && stringPos == m_periodStart && tmp_painting == false) {
            x_startPos = x_pos;
            tmp_painting = true;
        }

        // paint the current number (or comma)
        paintMiddle (paint, QString (m_number[stringPos]), x_pos, y_pos, fm, m_colorNumber, false);

        // check if the period line ends over the current number; in this case
        // draw the period line
        if (tmp_painting == true && m_periodStart + m_periodLength - 1 == stringPos) {
            tmp_painting = false;

            // paint the period line above the numbers
            paint.fillRect (x_startPos, fontHeight / 2, x_pos - x_startPos, 1, m_colorNumber);
        }
    }

    // paint a = at the end
    x_pos += _MARGIN_X;
    paintMiddle (paint, "=", x_pos, y_pos, fm, m_colorOperation);

    // stop the painter
    paint.end();

    // the space we needed for painting is the minimum width of the widget
    setMinimumWidth (x_pos);

    return;
}

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