examples/RSSListing.qs

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2008 Trolltech ASA. All rights reserved.
   4 **
   5 ** This file is part of the Qt Script Generator project on Trolltech Labs.
   6 **
   7 ** This file may be used under the terms of the GNU General Public
   8 ** License version 2.0 as published by the Free Software Foundation
   9 ** and appearing in the file LICENSE.GPL included in the packaging of
  10 ** this file.  Please review the following information to ensure GNU
  11 ** General Public Licensing requirements will be met:
  12 ** http://www.trolltech.com/products/qt/opensource.html
  13 **
  14 ** If you are unsure which license is appropriate for your use, please
  15 ** review the following information:
  16 ** http://www.trolltech.com/products/qt/licensing.html or contact the
  17 ** sales department at sales@trolltech.com.
  18 **
  19 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
  20 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  21 **
  22 ****************************************************************************/
  23
  24 function tr(s) { return s; }
  25
  26
  27 function RSSListing(parent)
  28 {
  29     QWidget.call(this, parent);
  30
  31     this.xml = new QXmlStreamReader();
  32     this.currentTag = "";
  33     this.linkString = "";
  34     this.titleString = "";
  35     this.connectionId = -1;
  36
  37     this.lineEdit = new QLineEdit(this);
  38     this.lineEdit.text = "http://labs.trolltech.com/blogs/feed";
  39
  40     this.fetchButton = new QPushButton(tr("Fetch"), this);
  41     this.abortButton = new QPushButton(tr("Abort"), this);
  42     this.abortButton.enabled = false;
  43
  44     this.treeWidget = new QTreeWidget(this);
  45     this.treeWidget["itemActivated(QTreeWidgetItem*, int)"].connect(
  46         this, this.itemActivated);
  47     var headerLabels = new Array();
  48     headerLabels.push(tr("Title"));
  49     headerLabels.push(tr("Link"));
  50     this.treeWidget.setHeaderLabels(headerLabels);
  51     this.treeWidget.header().setResizeMode(QHeaderView.ResizeToContents);
  52
  53     this.http = new QHttp(this);
  54     this.http.readyRead.connect(this, this.readData);
  55     this.http.requestFinished.connect(this, this.finished);
  56
  57     this.lineEdit.returnPressed.connect(this, this.fetch);
  58     this.fetchButton.clicked.connect(this, this.fetch);
  59     this.abortButton.clicked.connect(this.http, this.http.abort);
  60
  61     var layout = new QVBoxLayout(this);
  62
  63     var hboxLayout = new QHBoxLayout();
  64
  65     // ### working around problem with addWidget() binding
  66     hboxLayout.addWidget(this.lineEdit, 0, Qt.AlignLeft);
  67     hboxLayout.addWidget(this.fetchButton, 0, Qt.AlignLeft);
  68     hboxLayout.addWidget(this.abortButton, 0, Qt.AlignLeft);
  69
  70     layout.addLayout(hboxLayout);
  71     layout.addWidget(this.treeWidget, 0, Qt.AlignLeft);
  72
  73     this.windowTitle = tr("RSS listing example");
  74     this.resize(640,480);
  75 }
  76
  77 RSSListing.prototype = new QWidget();
  78
  79 RSSListing.prototype.fetch = function()
  80 {
  81     this.lineEdit.readOnly = true;
  82     this.fetchButton.enabled = false;
  83     this.abortButton.enabled = true;
  84     this.treeWidget.clear();
  85
  86     this.xml.clear();
  87
  88     var url = new QUrl(this.lineEdit.text);
  89
  90     this.http.setHost(url.host());
  91     this.connectionId = this.http.get(url.path());
  92 }
  93
  94 RSSListing.prototype.readData = function(resp)
  95 {
  96     if (resp.statusCode() != 200)
  97         this.http.abort();
  98     else {
  99         this.xml.addData(this.http.readAll());
 100         this.parseXml();
 101     }
 102 }
 103
 104 RSSListing.prototype.finished = function(id, error)
 105 {
 106     if (error) {
 107         print("Received error during HTTP fetch."); // ### qWarning()
 108         this.lineEdit.readOnly = false;
 109         this.abortButton.enabled = false;
 110         this.fetchButton.enabled = true;
 111     } else if (id == this.connectionId) {
 112         this.lineEdit.readOnly = false;
 113         this.abortButton.enabled = false;
 114         this.fetchButton.enabled = true;
 115     }
 116 }
 117
 118 RSSListing.prototype.parseXml = function()
 119 {
 120     while (!this.xml.atEnd()) {
 121         this.xml.readNext();
 122         if (this.xml.isStartElement()) {
 123             if (this.xml.name() == "item")
 124                 this.linkString = this.xml.attributes().value("rss:about").toString();
 125             this.currentTag = this.xml.name().toString();
 126         } else if (this.xml.isEndElement()) {
 127             if (this.xml.name() == "item") {
 128
 129                 var item = new QTreeWidgetItem();
 130                 item.setText(0, this.titleString);
 131                 item.setText(1, this.linkString);
 132                 this.treeWidget.addTopLevelItem(item);
 133
 134                 this.titleString = "";
 135                 this.linkString = "";
 136             }
 137
 138         } else if (this.xml.isCharacters() && !this.xml.isWhitespace()) {
 139             if (this.currentTag == "title")
 140                 this.titleString += this.xml.text().toString();
 141             else if (this.currentTag == "link")
 142                 this.linkString += this.xml.text().toString();
 143         }
 144     }
 145     if (this.xml.hasError() && (this.xml.error() != QXmlStreamReader.PrematureEndOfDocumentError)) {
 146         print("XML ERROR:", this.xml.lineNumber() + ":", this.xml.errorString());
 147         this.http.abort();
 148     }
 149 }
 150
 151 RSSListing.prototype.itemActivated = function(item)
 152 {
 153     QDesktopServices.openUrl(new QUrl(item.text(1)));
 154 }
 155
 156
 157 var rsslisting = new RSSListing();
 158 rsslisting.show();
 159 QCoreApplication.exec();