Qt 4.8: stationdialog.cpp Example File (xmlpatterns/trafficinfo/stationdialog.cpp)

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# stationdialog.cpp Example File

xmlpatterns/trafficinfo/stationdialog.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
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     **
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     ** modification, are permitted provided that the following conditions are
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     **     notice, this list of conditions and the following disclaimer in
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     **     distribution.
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     **     from this software without specific prior written permission.
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     #include "stationdialog.h"
     #include "ui_stationdialog.h"

     #include <QtCore/QAbstractListModel>

     class StationModel : public QAbstractListModel
     {
         public:
             enum Role
             {
                 StationIdRole = Qt::UserRole + 1,
                 StationNameRole
             };

             StationModel(QObject *parent = 0)
                 : QAbstractListModel(parent)
             {
             }

             void setStations(const StationInformation::List &list)
             {
                 m_stations = list;
                 layoutChanged();
             }

             virtual int rowCount(const QModelIndex &parent = QModelIndex()) const
             {
                 if (!parent.isValid())
                     return m_stations.count();
                 else
                     return 0;
             }

             virtual int columnCount(const QModelIndex &parent = QModelIndex()) const
             {
                 if (!parent.isValid())
                     return 1;
                 else
                     return 0;
             }

             virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const
             {
                 if (!index.isValid())
                     return QVariant();

                 if (index.column() > 1 || index.row() >= m_stations.count())
                     return QVariant();

                 const StationInformation info = m_stations.at(index.row());
                 if (role == Qt::DisplayRole || role == StationNameRole)
                     return info.name();
                 else if (role == StationIdRole)
                     return info.id();

                 return QVariant();
             }

         private:
             StationInformation::List m_stations;
     };

     StationDialog::StationDialog(const QString &name, const QStringList &lineNumbers, QWidget *parent)
         : QDialog(parent)
     {
         m_ui.setupUi(this);

         connect(m_ui.m_searchButton, SIGNAL(clicked()), this, SLOT(searchStations()));

         m_ui.m_searchButton->setDefault(true);
         m_ui.m_input->setText(name);

         m_model = new StationModel(this);
         m_ui.m_view->setModel(m_model);

         for (int i = 0; i < lineNumbers.count(); ++i) {
             if (i == 0)
                 m_ui.m_line1->setText(lineNumbers.at(i));
             else if (i == 1)
                 m_ui.m_line2->setText(lineNumbers.at(i));
             else if (i == 2)
                 m_ui.m_line3->setText(lineNumbers.at(i));
             else if (i == 3)
                 m_ui.m_line4->setText(lineNumbers.at(i));
         }

         QMetaObject::invokeMethod(this, SLOT(searchStations()), Qt::QueuedConnection);
     }

     StationInformation StationDialog::selectedStation() const
     {
         const QModelIndex index = m_ui.m_view->currentIndex();

         if (!index.isValid())
             return StationInformation();

         return StationInformation(index.data(StationModel::StationIdRole).toString(),
                                   index.data(StationModel::StationNameRole).toString());
     }

     QStringList StationDialog::lineNumbers() const
     {
         QStringList lines;

         if (!m_ui.m_line1->text().simplified().isEmpty())
             lines.append(m_ui.m_line1->text().simplified());
         if (!m_ui.m_line2->text().simplified().isEmpty())
             lines.append(m_ui.m_line2->text().simplified());
         if (!m_ui.m_line3->text().simplified().isEmpty())
             lines.append(m_ui.m_line3->text().simplified());
         if (!m_ui.m_line4->text().simplified().isEmpty())
             lines.append(m_ui.m_line4->text().simplified());

         return lines;
     }

     void StationDialog::searchStations()
     {
         m_model->setStations(StationQuery::query(m_ui.m_input->text()));
         m_ui.m_view->keyboardSearch(m_ui.m_input->text());
     }