e85de7d787
Cleanup network examples: - use nullptr - use member-init - adjust includes - use new-style connects Change-Id: I80aa230168e5aec88a1bc93bbf49a471bfc30e7b Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
232 lines
6.7 KiB
C++
232 lines
6.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** BSD License Usage
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** Alternatively, you may use this file under the terms of the BSD license
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** as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "googlesuggest.h"
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//! [1]
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const QString gsuggestUrl(QStringLiteral("http://google.com/complete/search?output=toolbar&q=%1"));
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//! [1]
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//! [2]
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GSuggestCompletion::GSuggestCompletion(QLineEdit *parent): QObject(parent), editor(parent)
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{
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popup = new QTreeWidget;
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popup->setWindowFlags(Qt::Popup);
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popup->setFocusPolicy(Qt::NoFocus);
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popup->setFocusProxy(parent);
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popup->setMouseTracking(true);
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popup->setColumnCount(1);
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popup->setUniformRowHeights(true);
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popup->setRootIsDecorated(false);
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popup->setEditTriggers(QTreeWidget::NoEditTriggers);
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popup->setSelectionBehavior(QTreeWidget::SelectRows);
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popup->setFrameStyle(QFrame::Box | QFrame::Plain);
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popup->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
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popup->header()->hide();
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popup->installEventFilter(this);
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connect(popup, &QTreeWidget::itemClicked,
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this, &GSuggestCompletion::doneCompletion);
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timer.setSingleShot(true);
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timer.setInterval(500);
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connect(&timer, &QTimer::timeout,
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this, &GSuggestCompletion::autoSuggest);
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connect(editor, &QLineEdit::textEdited,
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&timer, QOverload<>::of(&QTimer::start));
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connect(&networkManager, &QNetworkAccessManager::finished,
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this, &GSuggestCompletion::handleNetworkData);
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}
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//! [2]
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//! [3]
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GSuggestCompletion::~GSuggestCompletion()
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{
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delete popup;
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}
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//! [3]
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//! [4]
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bool GSuggestCompletion::eventFilter(QObject *obj, QEvent *ev)
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{
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if (obj != popup)
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return false;
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if (ev->type() == QEvent::MouseButtonPress) {
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popup->hide();
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editor->setFocus();
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return true;
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}
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if (ev->type() == QEvent::KeyPress) {
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bool consumed = false;
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int key = static_cast<QKeyEvent*>(ev)->key();
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switch (key) {
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case Qt::Key_Enter:
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case Qt::Key_Return:
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doneCompletion();
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consumed = true;
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break;
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case Qt::Key_Escape:
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editor->setFocus();
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popup->hide();
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consumed = true;
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break;
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case Qt::Key_Up:
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case Qt::Key_Down:
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case Qt::Key_Home:
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case Qt::Key_End:
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case Qt::Key_PageUp:
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case Qt::Key_PageDown:
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break;
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default:
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editor->setFocus();
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editor->event(ev);
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popup->hide();
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break;
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}
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return consumed;
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}
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return false;
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}
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//! [4]
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//! [5]
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void GSuggestCompletion::showCompletion(const QVector<QString> &choices)
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{
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if (choices.isEmpty())
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return;
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const QPalette &pal = editor->palette();
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QColor color = pal.color(QPalette::Disabled, QPalette::WindowText);
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popup->setUpdatesEnabled(false);
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popup->clear();
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for (const auto &choice : choices) {
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auto item = new QTreeWidgetItem(popup);
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item->setText(0, choice);
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item->setForeground(0, color);
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}
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popup->setCurrentItem(popup->topLevelItem(0));
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popup->resizeColumnToContents(0);
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popup->setUpdatesEnabled(true);
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popup->move(editor->mapToGlobal(QPoint(0, editor->height())));
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popup->setFocus();
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popup->show();
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}
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//! [5]
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//! [6]
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void GSuggestCompletion::doneCompletion()
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{
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timer.stop();
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popup->hide();
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editor->setFocus();
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QTreeWidgetItem *item = popup->currentItem();
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if (item) {
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editor->setText(item->text(0));
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QMetaObject::invokeMethod(editor, "returnPressed");
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}
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}
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//! [6]
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//! [7]
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void GSuggestCompletion::autoSuggest()
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{
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QString str = editor->text();
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QString url = gsuggestUrl.arg(str);
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networkManager.get(QNetworkRequest(url));
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}
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//! [7]
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//! [8]
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void GSuggestCompletion::preventSuggest()
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{
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timer.stop();
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}
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//! [8]
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//! [9]
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void GSuggestCompletion::handleNetworkData(QNetworkReply *networkReply)
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{
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QUrl url = networkReply->url();
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if (networkReply->error() == QNetworkReply::NoError) {
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QVector<QString> choices;
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QByteArray response(networkReply->readAll());
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QXmlStreamReader xml(response);
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while (!xml.atEnd()) {
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xml.readNext();
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if (xml.tokenType() == QXmlStreamReader::StartElement)
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if (xml.name() == "suggestion") {
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QStringRef str = xml.attributes().value("data");
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choices << str.toString();
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}
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}
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showCompletion(choices);
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}
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networkReply->deleteLater();
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}
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//! [9]
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