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115 lines
3.6 KiB
115 lines
3.6 KiB
/***************************************************************************
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rationalwidget.h - paint a rational number
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-------------------
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begin : 2004/06/04
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copyright : (C) 2004 by Sebastian Stein
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email : seb.kde@hpfsc.de
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "rationalwidget.h"
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#include "rationalwidget.moc"
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/* these includes are needed for TQt support */
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#include <tqpainter.h>
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#include <tqstring.h>
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RationalWidget::RationalWidget(TQWidget * parent, const char * name, const TQString pnumber, const uint pperiodStart, const uint pperiodLength):
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FractionBaseWidget(parent, name), m_number(pnumber),
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m_periodStart(pperiodStart), m_periodLength(pperiodLength)
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{
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#ifdef DEBUG
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kdDebug() << "constructor RationalWidget" << endl;
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#endif
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}
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RationalWidget::~RationalWidget()
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{
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#ifdef DEBUG
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kdDebug() << "destructor RationalWidget" << endl;
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#endif
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}
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void RationalWidget::setRational(const TQString pnumber, const uint pperiodStart, const uint pperiodLength)
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{
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m_number = pnumber;
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m_periodStart = pperiodStart;
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m_periodLength = pperiodLength;
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update();
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return;
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}
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void RationalWidget::paintEvent(TQPaintEvent* /* p_paintEvent */)
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{
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// our x position, we paint from left to right;
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// we don't want to start directly on the border, so add the margin
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int x_pos = _MARGIN_X;
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int x_startPos = _MARGIN_X;
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bool tmp_painting = false;
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// start the painter
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TQPainter paint(this);
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// ratios and operation signs are painted with the same font
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paint.setFont(m_font);
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// set the pen for painting
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TQPen pen(TQt::SolidLine);
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pen.setWidth(0);
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paint.setPen(pen);
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// get the font height; the font height doesn't change while painting
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TQFontMetrics fm(paint.fontMetrics());
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int fontHeight = fm.lineSpacing(); // get the font height
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// now we can correctly set the height of the widget
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setMinimumHeight(2 * fontHeight + 10);
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setMaximumHeight(2 * fontHeight + 10);
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// paint each char one by one
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for (uint stringPos = 0; stringPos < m_number.length(); stringPos++)
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{
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// check if the period line starts over the current number
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if (m_periodLength > 0 && stringPos == m_periodStart && tmp_painting == false)
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{
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x_startPos = x_pos;
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tmp_painting = true;
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}
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// paint the current number (or comma)
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paintMiddle(paint, TQString(m_number[stringPos]), x_pos, fm, m_colorNumber, false);
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// check if the period line ends over the current number; in this case
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// draw the period line
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if (tmp_painting == true && m_periodStart + m_periodLength - 1 == stringPos)
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{
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tmp_painting = false;
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// paint the period line above the numbers
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paint.fillRect(x_startPos, fontHeight - 3, x_pos - x_startPos, 1, m_colorNumber);
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}
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}
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// paint a = at the end
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x_pos += _MARGIN_X;
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paintMiddle(paint, "=", x_pos, fm, m_colorOperation);
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// stop the painter
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paint.end();
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// the space we needed for painting is the minimum width of the widget
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setMinimumWidth(x_pos);
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return;
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}
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