File indexing completed on 2022-12-06 18:52:33

0001 /*
0002     KBruch - line edit used for entering prime factors
0003     SPDX-FileCopyrightText: 2011 Sebastian Stein <seb.kde@hpfsc.de>
0004 
0005     SPDX-License-Identifier: GPL-2.0-or-later
0006 */
0007 
0008 #include "PrimeFactorsLineEdit.h"
0009 
0010 #ifdef DEBUG
0011 #include <QDebug>
0012 #endif
0013 
0014 /* constructor */
0015 PrimeFactorsLineEdit::PrimeFactorsLineEdit(QWidget * parent)
0016     : QLineEdit(parent)
0017 {
0018 #ifdef DEBUG
0019     qDebug() << QStringLiteral("constructor PrimeFactorsLineEdit");
0020 #endif
0021     m_usedFactors << QStringLiteral("2") << QStringLiteral("3") << QStringLiteral("5") << QStringLiteral("7") << QStringLiteral("11") << QStringLiteral("13") << QStringLiteral("17") << QStringLiteral("19");
0022     // I need this so dead keys go trough keyPressEvent
0023     setAttribute(Qt::WA_InputMethodEnabled, false);
0024     connect(this, &PrimeFactorsLineEdit::textEdited, this, &PrimeFactorsLineEdit::textHasChanged);
0025 }
0026 
0027 /* destructor */
0028 PrimeFactorsLineEdit::~PrimeFactorsLineEdit()
0029 {
0030 #ifdef DEBUG
0031     qDebug() << QStringLiteral("destructor PrimeFactorsLineEdit");
0032 #endif
0033 }
0034 
0035 void PrimeFactorsLineEdit::textHasChanged(const QString &text)
0036 {
0037     QPalette palette;
0038 
0039     if (!checkCorrectness(text)) {
0040         palette.setColor(QPalette::Base, Qt::red);
0041         setPalette(palette);
0042         Q_EMIT contentIsRight(false);
0043     } else {
0044         palette.setColor(QPalette::Base, Qt::white);
0045         setPalette(palette);
0046         Q_EMIT contentIsRight(true);
0047     }
0048 }
0049 
0050 bool PrimeFactorsLineEdit::checkCorrectness(const QString& theText)
0051 {
0052     QString auxStr = theText;
0053     QString noSpaces = auxStr.remove(QStringLiteral(" "));
0054     QStringList terms = noSpaces.split(QLatin1Char('x'));
0055 
0056     return (areFactors(terms) || text().isEmpty());
0057 }
0058 
0059 bool PrimeFactorsLineEdit::areFactors(const QStringList& factors)
0060 {
0061     m_theFactors.clear();
0062     for (const QString & str : factors) {
0063         bool found = false;
0064         for (const QString & aux : qAsConst(m_usedFactors)) {
0065             if (str.compare(str, aux) == 0) {
0066                 found = true;
0067                 m_theFactors.append(str);
0068                 break;
0069             }
0070         }
0071         if (!found) {
0072             return false;
0073         }
0074     }
0075 
0076     return true;
0077 }
0078 
0079 QStringList PrimeFactorsLineEdit::getFactors() const
0080 {
0081     return m_theFactors;
0082 }
0083 
0084 void PrimeFactorsLineEdit::keyPressEvent(QKeyEvent * event)
0085 {
0086     QString allowedChars = QStringLiteral("123579xX*");
0087     QString allowedDigits = QStringLiteral("123579");
0088     QString symbols = QStringLiteral("xX*");
0089     bool backspaceKey = (event->key() == Qt::Key_Backspace);
0090     bool returnKey = (event->key() == Qt::Key_Return
0091                       || event->key() == Qt::Key_Enter);
0092 
0093     setCursorPosition(text().length());
0094 
0095     if (allowedChars.contains(event->text()) || backspaceKey || returnKey) {
0096         QString lastFactor;
0097         QString ch = QStringLiteral("#");
0098         QString factor;
0099         if (!event->text().isEmpty()) {
0100             ch = event->text().at(0);
0101         }
0102         if (!text().isEmpty()) {
0103             lastFactor = text().section(QLatin1Char('x'), -1);
0104             factor = lastFactor + ch;
0105         } else {
0106             factor = ch;
0107         }
0108 
0109         if (allowedChars.contains(ch) || backspaceKey || returnKey) {
0110             // turns '*' and 'X' into 'x' to avoid mixed symbols
0111             // and to make easier to split the text later
0112             if (!event->text().isEmpty() && (symbols.indexOf(ch) != -1) && (factor.compare(QLatin1String("x")) != 0) && !lastFactor.isEmpty() && lastFactor.compare(QLatin1String("1")) != 0) {
0113                 QKeyEvent myKeyEvent(QKeyEvent::KeyPress, Qt::Key_X, Qt::NoModifier, QStringLiteral("x"), false, 0);
0114                 QLineEdit::keyPressEvent(&myKeyEvent);
0115             }
0116 
0117             if ((m_usedFactors.indexOf(factor) == -1)
0118                     && (factor.compare(QStringLiteral("1")) != 0) && !backspaceKey &&
0119                     !returnKey) {
0120                 return;
0121             }
0122 
0123             QLineEdit::keyPressEvent(event);
0124         }
0125     }
0126 }