File indexing completed on 2024-05-12 15:28:15

 /***************************************************************************
     File                 : ConstantsWidget.cc
     Project              : LabPlot
     Description          : widget for selecting constants
     --------------------------------------------------------------------
     Copyright            : (C) 2014 Alexander Semke (alexander.semke@web.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.                                    *
  *                                                                         *
  *  This program is distributed in the hope that it will be useful,        *
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
  *  GNU General Public License for more details.                           *
  *                                                                         *
  *   You should have received a copy of the GNU General Public License     *
  *   along with this program; if not, write to the Free Software           *
  *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
  *   Boston, MA  02110-1301  USA                                           *
  *                                                                         *
  ***************************************************************************/
 #include "ConstantsWidget.h"
 #include "backend/gsl/ExpressionParser.h"
 #include <QTimer>
 
 /*!
     \class ConstantsWidget
     \brief Widget for selecting supported mathematical and physical constants
     that can be used in expressions in \c ExpressionTextEdit.
 
     \ingroup kdefrontend
  */
 ConstantsWidget::ConstantsWidget(QWidget* parent) : QWidget(parent) {
     ui.setupUi(this);
     ui.bInsert->setIcon(QIcon::fromTheme("edit-paste"));
     ui.bCancel->setIcon(QIcon::fromTheme("dialog-cancel"));
     m_expressionParser = ExpressionParser::getInstance();
     ui.cbGroup->addItems(m_expressionParser->constantsGroups());
 
     //SLOTS
     connect(ui.leFilter, &QLineEdit::textChanged, this, &ConstantsWidget::filterChanged);
     connect(ui.cbGroup, QOverload<int>::of(&QComboBox::currentIndexChanged), this, &ConstantsWidget::groupChanged );
     connect(ui.lwConstants, &QListWidget::currentTextChanged, this, &ConstantsWidget::constantChanged);
     connect(ui.bInsert, &QPushButton::clicked, this, &ConstantsWidget::insertClicked);
     connect(ui.bCancel, &QPushButton::clicked, this, &ConstantsWidget::canceled);
     connect(ui.lwConstants, &QListWidget::itemDoubleClicked, this, &ConstantsWidget::insertClicked);
 
     //set the focus to the search field and select the first group after the widget is shown
     QTimer::singleShot(0, this, [=] () { ui.leFilter->setFocus(); this->groupChanged(0); });
 }
 
 /*!
  * shows all constants of the selected group and selects the first one in the QStringList
  */
 void ConstantsWidget::groupChanged(int index) {
     static const QStringList& constants = m_expressionParser->constants();
     static const QStringList& names = m_expressionParser->constantsNames();
     static const QVector<int>& indices = m_expressionParser->constantsGroupIndices();
 
     ui.lwConstants->clear();
     for (int i = 0; i < names.size(); ++i) {
         if (indices.at(i) == index)
             ui.lwConstants->addItem( names.at(i) + " (" + constants.at(i) + ')' );
     }
     ui.lwConstants->setCurrentRow(0);
 }
 
 void ConstantsWidget::filterChanged(const QString& filter) {
     if ( !filter.isEmpty() ) {
         ui.cbGroup->setEnabled(false);
 
         static const QStringList& names = m_expressionParser->constantsNames();
         static const QStringList& constants = m_expressionParser->constants();
         ui.lwConstants->clear();
         for (int i = 0; i < names.size(); ++i) {
             if (names.at(i).contains(filter, Qt::CaseInsensitive) || constants.at(i).contains(filter, Qt::CaseInsensitive))
                 ui.lwConstants->addItem( names.at(i) + " (" + constants.at(i) + ')' );
         }
 
         if (ui.lwConstants->count()) {
             ui.lwConstants->setCurrentRow(0);
             ui.bInsert->setEnabled(true);
         } else {
             ui.leValue->setText(QString());
             ui.lUnit->setText(QString());
             ui.bInsert->setEnabled(false);
         }
     } else {
         ui.cbGroup->setEnabled(true);
         groupChanged(ui.cbGroup->currentIndex());
     }
 }
 
 void ConstantsWidget::constantChanged(const QString& text) {
     static const QStringList& names = m_expressionParser->constantsNames();
     static const QStringList& values = m_expressionParser->constantsValues();
     static const QStringList& units = m_expressionParser->constantsUnits();
 
     QString name = text.left( text.indexOf(" (") );
     int index = names.indexOf(name);
     if (index != -1) {
         ui.leValue->setText(values.at(index));
         ui.leValue->setCursorPosition(0);
         ui.lUnit->setText(units.at(index));
     }
 }
 
 void ConstantsWidget::insertClicked() {
     static const QStringList& constants = m_expressionParser->constants();
     static const QStringList& names = m_expressionParser->constantsNames();
 
     //determine the currently selected constant
     const QString& text = ui.lwConstants->currentItem()->text();
     const QString& name = text.left( text.indexOf(" (") );
     int index = names.indexOf(name);
     const QString& constant = constants.at(index);
 
     emit constantSelected(constant);
 }