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taskwidget.cpp

/***************************************************************************
                          taskwidget.cpp  -  paint a task
                             -------------------
    begin                : 2004/05/30
    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
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 "taskwidget.h"
#include "taskwidget.moc"

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

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

00033 TaskWidget::TaskWidget (QWidget * parent = 0,
                        const task para_task = task()) :
    FractionBaseWidget (parent), m_task (para_task)
{
#ifdef DEBUG
    kDebug() << "constructor TaskWidget";
#endif
}

00042 TaskWidget::~TaskWidget()
{
#ifdef DEBUG
    kDebug() << "destructor TaskWidget";
#endif
}

00049 void TaskWidget::setTask (const task para_task)
{
    m_task = para_task;
    update();
}

void TaskWidget::setQuestionMixed (bool value)
{
    m_questionMixed = value;
    update();
}

00061 void TaskWidget::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 old_x = _MARGIN_X;
    int old_y = 0;

    // strings holding numerator, denominator and the operation sign
    QString str_numerator, str_denominator, str_operation;

    // operation sign as number
    short tmp_operation;

    // 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());

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

    // loop through all ratios and paint them
    for (unsigned short tmp_counter = 0; tmp_counter < m_task.getNumberOfRatios(); tmp_counter++) {
        // get the current ratio and paint it
        paintRatio (paint, m_task.get_ratio_n (tmp_counter), old_x, old_y, fm, m_questionMixed);

        // now check if we have another operation to show
        // if not we will stop showing ratios as well
        if (tmp_counter < m_task.getNumberOfOperations()) {
            // get the operation sign
            tmp_operation = m_task.get_op_n (tmp_counter);

            // we have to convert the operation sign into a string
            switch (tmp_operation) {
            case ADD :
                str_operation = "+";
                break;
            case SUB :
                str_operation = "-";
                break;
            case MUL :
                str_operation = "x";
                break;
            case DIV :
                // there seems to be different division signs around the world
                // so please translate it to the right one for your country
                str_operation = i18nc ("division symbol", "/");
                break;
            } /* switch (operation) */

            // paint the operation
            paintMiddle (paint, str_operation, old_x, old_y, fm, m_colorOperation);

        } else {
            // no further operations to show, so we always show the = sign at the
            // end of a task
            paintMiddle (paint, "=", old_x, old_y, fm, m_colorOperation);

            break;
        } // if (tmp_counter < m_task.getNumberOfOperations())
    }

    // stop the painter
    paint.end();

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

    return;
}

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