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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commitce599e4f9f94b4eb00c1b5edb85bce5431ab3df2 (patch)
treed3bb9f5d25a2dc09ca81adecf39621d871534297 /kbruch/src/rationalwidget.cpp
downloadtdeedu-ce599e4f9f94b4eb00c1b5edb85bce5431ab3df2.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdeedu@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+/***************************************************************************
+ rationalwidget.h - paint a rational number
+ -------------------
+ begin : 2004/06/04
+ copyright : (C) 2004 by Sebastian Stein
+ email : seb.kde@hpfsc.de
+ ***************************************************************************/
+
+/***************************************************************************
+ * *
+ * 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 Qt support */
+#include <qpainter.h>
+#include <qstring.h>
+
+RationalWidget::RationalWidget(QWidget * parent, const char * name, const QString pnumber, const uint pperiodStart, const uint pperiodLength):
+ FractionBaseWidget(parent, name), m_number(pnumber),
+ m_periodStart(pperiodStart), m_periodLength(pperiodLength)
+{
+#ifdef DEBUG
+ kdDebug() << "constructor RationalWidget" << endl;
+#endif
+}
+
+RationalWidget::~RationalWidget()
+{
+#ifdef DEBUG
+ kdDebug() << "destructor RationalWidget" << endl;
+#endif
+}
+
+void RationalWidget::setRational(const QString pnumber, const uint pperiodStart, const uint pperiodLength)
+{
+ m_number = pnumber;
+ m_periodStart = pperiodStart;
+ m_periodLength = pperiodLength;
+
+ update();
+
+ return;
+}
+
+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 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 (uint 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, 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 - 3, x_pos - x_startPos, 1, m_colorNumber);
+ }
+ }
+
+ // paint a = at the end
+ x_pos += _MARGIN_X;
+ paintMiddle(paint, "=", x_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;
+}