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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
commite5fcad302d86d316390c6b0f62759a067313e8a9 (patch)
treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /examples/xml/rsslisting
downloadQt-e5fcad302d86d316390c6b0f62759a067313e8a9.zip
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Long live Qt 4.5!
Diffstat (limited to 'examples/xml/rsslisting')
-rw-r--r--examples/xml/rsslisting/main.cpp64
-rw-r--r--examples/xml/rsslisting/rsslisting.cpp239
-rw-r--r--examples/xml/rsslisting/rsslisting.h87
-rw-r--r--examples/xml/rsslisting/rsslisting.pro10
4 files changed, 400 insertions, 0 deletions
diff --git a/examples/xml/rsslisting/main.cpp b/examples/xml/rsslisting/main.cpp
new file mode 100644
index 0000000..0c9b275
--- /dev/null
+++ b/examples/xml/rsslisting/main.cpp
@@ -0,0 +1,64 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+main.cpp
+
+Provides the main function for the RSS news reader example.
+*/
+
+#include <QtGui>
+
+#include "rsslisting.h"
+
+/*!
+ Create an application and a main widget. Open the main widget for
+ user input, and exit with an appropriate return value when it is
+ closed.
+*/
+
+int main(int argc, char **argv)
+{
+ QApplication app(argc, argv);
+ RSSListing *rsslisting = new RSSListing;
+ rsslisting->show();
+ return app.exec();
+}
diff --git a/examples/xml/rsslisting/rsslisting.cpp b/examples/xml/rsslisting/rsslisting.cpp
new file mode 100644
index 0000000..9212c11
--- /dev/null
+++ b/examples/xml/rsslisting/rsslisting.cpp
@@ -0,0 +1,239 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*
+rsslisting.cpp
+
+Provides a widget for displaying news items from RDF news sources.
+RDF is an XML-based format for storing items of information (see
+http://www.w3.org/RDF/ for details).
+
+The widget itself provides a simple user interface for specifying
+the URL of a news source, and controlling the downloading of news.
+
+The widget downloads and parses the XML asynchronously, feeding the
+data to an XML reader in pieces. This allows the user to interrupt
+its operation, and also allows very large data sources to be read.
+*/
+
+
+#include <QtCore>
+#include <QtGui>
+#include <QtNetwork>
+
+#include "rsslisting.h"
+
+
+/*
+ Constructs an RSSListing widget with a simple user interface, and sets
+ up the XML reader to use a custom handler class.
+
+ The user interface consists of a line edit, two push buttons, and a
+ list view widget. The line edit is used for entering the URLs of news
+ sources; the push buttons start and abort the process of reading the
+ news.
+*/
+
+RSSListing::RSSListing(QWidget *parent)
+ : QWidget(parent)
+{
+ lineEdit = new QLineEdit(this);
+ lineEdit->setText("http://labs.trolltech.com/blogs/feed");
+
+ fetchButton = new QPushButton(tr("Fetch"), this);
+ abortButton = new QPushButton(tr("Abort"), this);
+ abortButton->setEnabled(false);
+
+ treeWidget = new QTreeWidget(this);
+ connect(treeWidget, SIGNAL(itemActivated(QTreeWidgetItem*, int)),
+ this, SLOT(itemActivated(QTreeWidgetItem*)));
+ QStringList headerLabels;
+ headerLabels << tr("Title") << tr("Link");
+ treeWidget->setHeaderLabels(headerLabels);
+ treeWidget->header()->setResizeMode(QHeaderView::ResizeToContents);
+
+ connect(&http, SIGNAL(readyRead(const QHttpResponseHeader &)),
+ this, SLOT(readData(const QHttpResponseHeader &)));
+
+ connect(&http, SIGNAL(requestFinished(int, bool)),
+ this, SLOT(finished(int, bool)));
+
+ connect(lineEdit, SIGNAL(returnPressed()), this, SLOT(fetch()));
+ connect(fetchButton, SIGNAL(clicked()), this, SLOT(fetch()));
+ connect(abortButton, SIGNAL(clicked()), &http, SLOT(abort()));
+
+ QVBoxLayout *layout = new QVBoxLayout(this);
+
+ QHBoxLayout *hboxLayout = new QHBoxLayout;
+
+ hboxLayout->addWidget(lineEdit);
+ hboxLayout->addWidget(fetchButton);
+ hboxLayout->addWidget(abortButton);
+
+ layout->addLayout(hboxLayout);
+ layout->addWidget(treeWidget);
+
+ setWindowTitle(tr("RSS listing example"));
+ resize(640,480);
+}
+
+/*
+ Starts fetching data from a news source specified in the line
+ edit widget.
+
+ The line edit is made read only to prevent the user from modifying its
+ contents during the fetch; this is only for cosmetic purposes.
+ The fetch button is disabled, and the abort button is enabled to allow
+ the user to interrupt processing. The list view is cleared, and we
+ define the last list view item to be 0, meaning that there are no
+ existing items in the list.
+
+ The HTTP handler is supplied with the raw contents of the line edit and
+ a fetch is initiated. We keep the ID value returned by the HTTP handler
+ for future reference.
+*/
+
+void RSSListing::fetch()
+{
+ lineEdit->setReadOnly(true);
+ fetchButton->setEnabled(false);
+ abortButton->setEnabled(true);
+ treeWidget->clear();
+
+ xml.clear();
+
+ QUrl url(lineEdit->text());
+
+ http.setHost(url.host());
+ connectionId = http.get(url.path());
+}
+
+/*
+ Reads data received from the RDF source.
+
+ We read all the available data, and pass it to the XML
+ stream reader. Then we call the XML parsing function.
+
+ If parsing fails for any reason, we abort the fetch.
+*/
+
+void RSSListing::readData(const QHttpResponseHeader &resp)
+{
+ if (resp.statusCode() != 200)
+ http.abort();
+ else {
+ xml.addData(http.readAll());
+ parseXml();
+ }
+}
+
+/*
+ Finishes processing an HTTP request.
+
+ The default behavior is to keep the text edit read only.
+
+ If an error has occurred, the user interface is made available
+ to the user for further input, allowing a new fetch to be
+ started.
+
+ If the HTTP get request has finished, we make the
+ user interface available to the user for further input.
+*/
+
+void RSSListing::finished(int id, bool error)
+{
+ if (error) {
+ qWarning("Received error during HTTP fetch.");
+ lineEdit->setReadOnly(false);
+ abortButton->setEnabled(false);
+ fetchButton->setEnabled(true);
+ }
+ else if (id == connectionId) {
+ lineEdit->setReadOnly(false);
+ abortButton->setEnabled(false);
+ fetchButton->setEnabled(true);
+ }
+}
+
+
+/*
+ Parses the XML data and creates treeWidget items accordingly.
+*/
+void RSSListing::parseXml()
+{
+ while (!xml.atEnd()) {
+ xml.readNext();
+ if (xml.isStartElement()) {
+ if (xml.name() == "item")
+ linkString = xml.attributes().value("rss:about").toString();
+ currentTag = xml.name().toString();
+ } else if (xml.isEndElement()) {
+ if (xml.name() == "item") {
+
+ QTreeWidgetItem *item = new QTreeWidgetItem;
+ item->setText(0, titleString);
+ item->setText(1, linkString);
+ treeWidget->addTopLevelItem(item);
+
+ titleString.clear();
+ linkString.clear();
+ }
+
+ } else if (xml.isCharacters() && !xml.isWhitespace()) {
+ if (currentTag == "title")
+ titleString += xml.text().toString();
+ else if (currentTag == "link")
+ linkString += xml.text().toString();
+ }
+ }
+ if (xml.error() && xml.error() != QXmlStreamReader::PrematureEndOfDocumentError) {
+ qWarning() << "XML ERROR:" << xml.lineNumber() << ": " << xml.errorString();
+ http.abort();
+ }
+}
+
+/*
+ Open the link in the browser
+*/
+void RSSListing::itemActivated(QTreeWidgetItem * item)
+{
+ QDesktopServices::openUrl(QUrl(item->text(1)));
+}
diff --git a/examples/xml/rsslisting/rsslisting.h b/examples/xml/rsslisting/rsslisting.h
new file mode 100644
index 0000000..f0007de
--- /dev/null
+++ b/examples/xml/rsslisting/rsslisting.h
@@ -0,0 +1,87 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef RSSLISTING_H
+#define RSSLISTING_H
+
+#include <QHttp>
+#include <QWidget>
+#include <QBuffer>
+#include <QXmlStreamReader>
+
+QT_BEGIN_NAMESPACE
+class QLineEdit;
+class QTreeWidget;
+class QTreeWidgetItem;
+class QPushButton;
+QT_END_NAMESPACE
+
+class RSSListing : public QWidget
+{
+ Q_OBJECT
+public:
+ RSSListing(QWidget *widget = 0);
+
+public slots:
+ void fetch();
+ void finished(int id, bool error);
+ void readData(const QHttpResponseHeader &);
+ void itemActivated(QTreeWidgetItem * item);
+
+private:
+ void parseXml();
+
+ QXmlStreamReader xml;
+ QString currentTag;
+ QString linkString;
+ QString titleString;
+
+ QHttp http;
+ int connectionId;
+
+ QLineEdit *lineEdit;
+ QTreeWidget *treeWidget;
+ QPushButton *abortButton;
+ QPushButton *fetchButton;
+};
+
+#endif
+
diff --git a/examples/xml/rsslisting/rsslisting.pro b/examples/xml/rsslisting/rsslisting.pro
new file mode 100644
index 0000000..95a23e9
--- /dev/null
+++ b/examples/xml/rsslisting/rsslisting.pro
@@ -0,0 +1,10 @@
+HEADERS += rsslisting.h
+SOURCES += main.cpp rsslisting.cpp
+QT += network xml
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/xml/rsslisting
+sources.files = $$SOURCES $$HEADERS $$RESOURCES $$FORMS rsslisting.pro
+sources.path = $$[QT_INSTALL_EXAMPLES]/xml/rsslisting
+INSTALLS += target sources
+