Qt 4.8: csvview.cpp Example File (webkit/webplugin/csvview.cpp)

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# csvview.cpp Example File

webkit/webplugin/csvview.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #include <QtGui>
     #include <QtNetwork>
     #include "csvview.h"

     CSVView::CSVView(const QString &mimeType, QWidget *parent)
         : QTableView(parent)
     {
         this->mimeType = mimeType;

         setEditTriggers(NoEditTriggers);
         setSelectionBehavior(SelectRows);
         setSelectionMode(SingleSelection);
     }

     void CSVView::updateModel()
     {
         QNetworkReply *reply = static_cast<QNetworkReply *>(sender());

         if (reply->error() != QNetworkReply::NoError)
             return;

         bool hasHeader = false;
         QString charset = "latin1";

         foreach (QString piece, mimeType.split(";")) {
             piece = piece.trimmed();
             if (piece.contains("=")) {
                 int index = piece.indexOf("=");
                 QString left = piece.left(index).trimmed();
                 QString right = piece.mid(index + 1).trimmed();
                 if (left == "header")
                     hasHeader = (right == "present");
                 else if (left == "charset")
                     charset = right;
             }
         }

         QTextStream stream(reply);
         stream.setCodec(QTextCodec::codecForName(charset.toLatin1()));

         QStandardItemModel *model = new QStandardItemModel(this);
         QList<QStandardItem *> items;
         bool firstLine = hasHeader;
         bool wasQuote = false;
         bool wasCR = false;
         bool quoted = false;
         QString text;

         while (!stream.atEnd()) {

             QString ch = stream.read(1);

             if (wasQuote) {
                 if (ch == "\"") {
                     if (quoted) {
                         text += ch;         // quoted "" are inserted as "
                         wasQuote = false;   // no quotes are pending
                     } else {
                         quoted = true;      // unquoted "" starts quoting
                         wasQuote = true;    // with a pending quote
                     }
                     continue;               // process the next character

                 } else {
                     quoted = !quoted;       // process the pending quote
                     wasQuote = false;       // no quotes are pending
                 }                           // process the current character

             } else if (wasCR) {
                 wasCR = false;

                 if (ch == "\n") {           // CR LF represents the end of a row
                     if (!text.isEmpty())
                         items.append(new QStandardItem(QString(text)));

                     addRow(firstLine, model, items);
                     items.clear();
                     text = "";
                     firstLine = false;
                     continue;               // process the next character
                 } else
                     text += "\r";           // CR on its own is inserted
             }                               // process the current character

             // wasQuote is never true here.
             // wasCR is never true here.

             if (ch == "\"")
                 wasQuote = true;            // handle the pending quote later

             else if (ch == ",") {
                 if (quoted)
                     text += ch;
                 else {
                     items.append(new QStandardItem(QString(text)));
                     text = "";
                 }
             }

             else if (ch == "\r") {
                 if (!quoted)
                     wasCR = true;
                 else
                     text += ch;
             }

             else if (ch == "\n")
                 text += ch;
             else
                 text += ch;

         }

         if (items.count() > 0)
             addRow(firstLine, model, items);

         reply->close();

         setModel(model);

         connect(selectionModel(),
                 SIGNAL(currentChanged(const QModelIndex &, const QModelIndex &)),
                 this, SLOT(exportRow(const QModelIndex &)));

         resizeColumnsToContents();
         horizontalHeader()->setStretchLastSection(true);
     }

     void CSVView::addRow(bool firstLine, QStandardItemModel *model,
                          const QList<QStandardItem *> &items)
     {
         if (firstLine) {
             for (int j = 0; j < items.count(); ++j)
                 model->setHorizontalHeaderItem(j, items[j]);
         } else
             model->appendRow(items);
     }

     void CSVView::exportRow(const QModelIndex &current)
     {
         QString name = model()->index(current.row(), 0).data().toString();
         QString address = model()->index(current.row(), 1).data().toString();
         QString quantity = model()->index(current.row(), 2).data().toString();

         emit rowSelected(name, address, quantity);
     }