QNetworkAccessManager based google suggest
/**************************************************************************** ** ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** 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 1.1, 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 have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/ #ifndef GOOGLESUGGEST_H #define GOOGLESUGGEST_H #include <QObject> #include <QNetworkAccessManager> QT_BEGIN_NAMESPACE class QLineEdit; class QNetworkReply; class QTimer; class QTreeWidget; QT_END_NAMESPACE class GSuggestCompletion : public QObject { Q_OBJECT public: GSuggestCompletion(QLineEdit *parent = 0); ~GSuggestCompletion(); bool eventFilter(QObject *obj, QEvent *ev); void showCompletion(const QStringList &choices, const QStringList &hits); public slots: void doneCompletion(); void preventSuggest(); void autoSuggest(); void handleNetworkData(QNetworkReply *networkReply); private: QLineEdit *editor; QTreeWidget *popup; QTimer *timer; QNetworkAccessManager networkManager; }; #endif // GOOGLESUGGEST_H #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(); } #ifndef SEARCHBOX_H #define SEARCHBOX_H #include <QLineEdit> class GSuggestCompletion; class SearchBox: public QLineEdit { Q_OBJECT public: SearchBox(QWidget *parent = 0); protected slots: void doSearch(); private: GSuggestCompletion *completer; }; #endif // SEARCHBOX_H #include <QDesktopServices> #include <QUrl> #include "searchbox.h" #include "googlesuggest.h" #define GSEARCH_URL "http://www.google.com/search?q=%1" SearchBox::SearchBox(QWidget *parent): QLineEdit(parent) { completer = new GSuggestCompletion(this); connect(this, SIGNAL(returnPressed()), SLOT(doSearch())); setWindowTitle("Search with Google"); adjustSize(); resize(400, height()); setFocus(); } void SearchBox::doSearch() { completer->preventSuggest(); QString url = QString(GSEARCH_URL).arg(text()); QDesktopServices::openUrl(QUrl(url)); } #include <QApplication> #include "searchbox.h" int main(int argc, char * argv[]) { QApplication app(argc, argv); SearchBox *searchEdit = new SearchBox; searchEdit->show(); return app.exec(); }
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