Add Google Suggest as a new network example

Reviewed-by: Simon Hausmann <simon.hausmann@nokia.com>

1 files changed, 223 insertions, 0 deletions

diff --git a/examples/network/googlesuggest/googlesuggest.cpp b/examples/network/googlesuggest/googlesuggest.cpp
new file mode 100644
index 0000000..285a018
--- /dev/null
+++ b/examples/network/googlesuggest/googlesuggest.cpp
@@ -0,0 +1,223 @@
+/****************************************************************************
+**
+** 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.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore>
+#include <QtGui>
+#include <QtNetwork>
+
+#include "googlesuggest.h"
+
+#define GSUGGEST_URL "http://google.com/complete/search?output=toolbar&q=%1"
+
+GSuggestCompletion::GSuggestCompletion(QLineEdit *parent): QObject(parent), editor(parent)
+{
+    popup = new QTreeWidget;
+    popup->setColumnCount(2);
+    popup->setUniformRowHeights(true);
+    popup->setRootIsDecorated(false);
+    popup->setEditTriggers(QTreeWidget::NoEditTriggers);
+    popup->setSelectionBehavior(QTreeWidget::SelectRows);
+    popup->setFrameStyle(QFrame::Box | QFrame::Plain);
+    popup->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+
+    popup->header()->hide();
+    popup->installEventFilter(this);
+    popup->setMouseTracking(true);
+
+    connect(popup, SIGNAL(itemClicked(QTreeWidgetItem*, int)),
+            SLOT(doneCompletion()));
+
+    popup->setWindowFlags(Qt::Popup);
+    popup->setFocusPolicy(Qt::NoFocus);
+    popup->setFocusProxy(parent);
+
+    timer = new QTimer(this);
+    timer->setSingleShot(true);
+    timer->setInterval(500);
+    connect(timer, SIGNAL(timeout()), SLOT(autoSuggest()));
+    connect(editor, SIGNAL(textEdited(QString)), timer, SLOT(start()));
+
+    connect(&networkManager, SIGNAL(finished(QNetworkReply*)),
+            this, SLOT(handleNetworkData(QNetworkReply*)));
+
+}
+
+GSuggestCompletion::~GSuggestCompletion()
+{
+    delete popup;
+}
+
+bool GSuggestCompletion::eventFilter(QObject *obj, QEvent *ev)
+{
+    if (obj != popup)
+        return false;
+
+    if (ev->type() == QEvent::MouseButtonPress) {
+        popup->hide();
+        editor->setFocus();
+        return true;
+    }
+
+    if (ev->type() == QEvent::KeyPress) {
+
+        bool consumed = false;
+        int key = static_cast<QKeyEvent*>(ev)->key();
+        switch (key) {
+        case Qt::Key_Enter:
+        case Qt::Key_Return:
+            doneCompletion();
+            consumed = true;
+
+        case Qt::Key_Escape:
+            editor->setFocus();
+            popup->hide();
+            consumed = true;
+
+        case Qt::Key_Up:
+        case Qt::Key_Down:
+        case Qt::Key_Home:
+        case Qt::Key_End:
+        case Qt::Key_PageUp:
+        case Qt::Key_PageDown:
+            break;
+
+        default:
+            editor->setFocus();
+            editor->event(ev);
+            popup->hide();
+            break;
+        }
+
+        return consumed;
+    }
+
+    return false;
+}
+
+void GSuggestCompletion::showCompletion(const QStringList &choices, const QStringList &hits)
+{
+
+    if (choices.isEmpty() || choices.count() != hits.count())
+        return;
+
+    const QPalette &pal = editor->palette();
+    QColor color = pal.color(QPalette::Disabled, QPalette::WindowText);
+
+    popup->setUpdatesEnabled(false);
+    popup->clear();
+    for (int i = 0; i < choices.count(); ++i) {
+        QTreeWidgetItem * item;
+        item = new QTreeWidgetItem(popup);
+        item->setText(0, choices[i]);
+        item->setText(1, hits[i]);
+        item->setTextAlignment(1, Qt::AlignRight);
+        item->setTextColor(1, color);
+    }
+    popup->setCurrentItem(popup->topLevelItem(0));
+    popup->resizeColumnToContents(0);
+    popup->resizeColumnToContents(1);
+    popup->adjustSize();
+    popup->setUpdatesEnabled(true);
+
+    int h = popup->sizeHintForRow(0) * qMin(7, choices.count()) + 3;
+    popup->resize(popup->width(), h);
+
+    popup->move(editor->mapToGlobal(QPoint(0, editor->height())));
+    popup->setFocus();
+    popup->show();
+}
+
+void GSuggestCompletion::doneCompletion()
+{
+    timer->stop();
+    popup->hide();
+    editor->setFocus();
+    QTreeWidgetItem *item = popup->currentItem();
+    if (item) {
+        editor->setText(item->text(0));
+        QKeyEvent *e;
+        e = new QKeyEvent(QEvent::KeyPress, Qt::Key_Enter, Qt::NoModifier);
+        QApplication::postEvent(editor, e);
+        e = new QKeyEvent(QEvent::KeyRelease, Qt::Key_Enter, Qt::NoModifier);
+        QApplication::postEvent(editor, e);
+    }
+}
+
+void GSuggestCompletion::preventSuggest()
+{
+    timer->stop();
+}
+
+void GSuggestCompletion::autoSuggest()
+{
+    QString str = editor->text();
+    QString url = QString(GSUGGEST_URL).arg(str);
+    networkManager.get(QNetworkRequest(QString(url)));
+}
+
+void GSuggestCompletion::handleNetworkData(QNetworkReply *networkReply)
+{
+    QUrl url = networkReply->url();
+    if (!networkReply->error()) {
+        QStringList choices;
+        QStringList hits;
+
+        QString response(networkReply->readAll());
+        QXmlStreamReader xml(response);
+        while (!xml.atEnd()) {
+            xml.readNext();
+            if (xml.tokenType() == QXmlStreamReader::StartElement)
+                if (xml.name() == "suggestion") {
+                    QStringRef str = xml.attributes().value("data");
+                    choices << str.toString();
+                }
+            if (xml.tokenType() == QXmlStreamReader::StartElement)
+                if (xml.name() == "num_queries") {
+                    QStringRef str = xml.attributes().value("int");
+                    hits << str.toString();
+                }
+        }
+
+        showCompletion(choices, hits);
+    }
+
+    networkReply->deleteLater();
+}