googlesuggest.cpp Example File

googlesuggest/googlesuggest.cpp
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#include "googlesuggest.h" const QString gsuggestUrl(QStringLiteral("http://google.com/complete/search?output=toolbar&q=%1")); GSuggestCompletion::GSuggestCompletion(QLineEdit *parent): QObject(parent), editor(parent) { popup = new QTreeWidget; popup->setWindowFlags(Qt::Popup); popup->setFocusPolicy(Qt::NoFocus); popup->setFocusProxy(parent); popup->setMouseTracking(true); popup->setColumnCount(1); 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); connect(popup, SIGNAL(itemClicked(QTreeWidgetItem*,int)), SLOT(doneCompletion())); 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; break; case Qt::Key_Escape: editor->setFocus(); popup->hide(); consumed = true; break; 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 QVector<QString> &choices) { if (choices.isEmpty()) return; const QPalette &pal = editor->palette(); QColor color = pal.color(QPalette::Disabled, QPalette::WindowText); popup->setUpdatesEnabled(false); popup->clear(); for (const auto &choice : choices) { auto item = new QTreeWidgetItem(popup); item->setText(0, choice); item->setTextColor(0, color); } popup->setCurrentItem(popup->topLevelItem(0)); popup->resizeColumnToContents(0); popup->setUpdatesEnabled(true); 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)); QMetaObject::invokeMethod(editor, "returnPressed"); } } void GSuggestCompletion::autoSuggest() { QString str = editor->text(); QString url = gsuggestUrl.arg(str); networkManager.get(QNetworkRequest(url)); } void GSuggestCompletion::preventSuggest() { timer.stop(); } void GSuggestCompletion::handleNetworkData(QNetworkReply *networkReply) { QUrl url = networkReply->url(); if (networkReply->error() == QNetworkReply::NoError) { QVector<QString> choices; QByteArray 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(); } } showCompletion(choices); } networkReply->deleteLater(); }