<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>googlesuggest.cpp Example File | Qt Network 5.12.6</title> <link rel="stylesheet" type="text/css" href="style/offline-simple.css" /> <script type="text/javascript"> document.getElementsByTagName("link").item(0).setAttribute("href", "style/offline.css"); // loading style sheet breaks anchors that were jumped to before // so force jumping to anchor again setTimeout(function() { var anchor = location.hash; // need to jump to different anchor first (e.g. none) location.hash = "#"; setTimeout(function() { location.hash = anchor; }, 0); }, 0); </script> </head> <body> <div class="header" id="qtdocheader"> <div class="main"> <div class="main-rounded"> <div class="navigationbar"> <table><tr> <td >Qt 5.12</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-googlesuggest-example.html">Google Suggest Example</a></td><td >googlesuggest.cpp Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtnetwork-index.html">Qt 5.12.6 Reference Documentation</a></td> </tr></table> </div> </div> <div class="content"> <div class="line"> <div class="content mainContent"> <div class="sidebar"><div class="sidebar-content" id="sidebar-content"></div></div> <h1 class="title">googlesuggest.cpp Example File</h1> <span class="subtitle">googlesuggest/googlesuggest.cpp</span> <!-- $$$googlesuggest/googlesuggest.cpp-description --> <div class="descr"> <a name="details"></a> <pre class="cpp"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2016 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:BSD$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** BSD License Usage ** Alternatively, you may use this file under the terms of the BSD license ** as follows: ** ** "Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions are ** met: ** * Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** * Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in ** the documentation and/or other materials provided with the ** distribution. ** * Neither the name of The Qt Company Ltd nor the names of its ** contributors may be used to endorse or promote products derived ** from this software without specific prior written permission. ** ** ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." ** ** $QT_END_LICENSE$ ** ****************************************************************************/</span> <span class="preprocessor">#include "googlesuggest.h"</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> gsuggestUrl(<span class="type"><a href="../qtcore/qstring.html#QStringLiteral">QStringLiteral</a></span>(<span class="string">"http://google.com/complete/search?output=toolbar&q=%1"</span>)); GSuggestCompletion<span class="operator">::</span>GSuggestCompletion(<span class="type">QLineEdit</span> <span class="operator">*</span>parent): <span class="type"><a href="../qtcore/qobject.html">QObject</a></span>(parent)<span class="operator">,</span> editor(parent) { popup <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QTreeWidget</span>; popup<span class="operator">-</span><span class="operator">></span>setWindowFlags(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Popup); popup<span class="operator">-</span><span class="operator">></span>setFocusPolicy(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoFocus); popup<span class="operator">-</span><span class="operator">></span>setFocusProxy(parent); popup<span class="operator">-</span><span class="operator">></span>setMouseTracking(<span class="keyword">true</span>); popup<span class="operator">-</span><span class="operator">></span>setColumnCount(<span class="number">1</span>); popup<span class="operator">-</span><span class="operator">></span>setUniformRowHeights(<span class="keyword">true</span>); popup<span class="operator">-</span><span class="operator">></span>setRootIsDecorated(<span class="keyword">false</span>); popup<span class="operator">-</span><span class="operator">></span>setEditTriggers(<span class="type">QTreeWidget</span><span class="operator">::</span>NoEditTriggers); popup<span class="operator">-</span><span class="operator">></span>setSelectionBehavior(<span class="type">QTreeWidget</span><span class="operator">::</span>SelectRows); popup<span class="operator">-</span><span class="operator">></span>setFrameStyle(<span class="type">QFrame</span><span class="operator">::</span>Box <span class="operator">|</span> <span class="type">QFrame</span><span class="operator">::</span>Plain); popup<span class="operator">-</span><span class="operator">></span>setHorizontalScrollBarPolicy(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ScrollBarAlwaysOff); popup<span class="operator">-</span><span class="operator">></span>header()<span class="operator">-</span><span class="operator">></span>hide(); popup<span class="operator">-</span><span class="operator">></span>installEventFilter(<span class="keyword">this</span>); connect(popup<span class="operator">,</span> SIGNAL(itemClicked(<span class="type">QTreeWidgetItem</span><span class="operator">*</span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span> SLOT(doneCompletion())); timer<span class="operator">.</span>setSingleShot(<span class="keyword">true</span>); timer<span class="operator">.</span>setInterval(<span class="number">500</span>); connect(<span class="operator">&</span>timer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> SLOT(autoSuggest())); connect(editor<span class="operator">,</span> SIGNAL(textEdited(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>))<span class="operator">,</span> <span class="operator">&</span>timer<span class="operator">,</span> SLOT(start())); connect(<span class="operator">&</span>networkManager<span class="operator">,</span> SIGNAL(finished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(handleNetworkData(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>))); } GSuggestCompletion<span class="operator">::</span><span class="operator">~</span>GSuggestCompletion() { <span class="keyword">delete</span> popup; } bool GSuggestCompletion<span class="operator">::</span>eventFilter(<span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>obj<span class="operator">,</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>ev) { <span class="keyword">if</span> (obj <span class="operator">!</span><span class="operator">=</span> popup) <span class="keyword">return</span> <span class="keyword">false</span>; <span class="keyword">if</span> (ev<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>MouseButtonPress) { popup<span class="operator">-</span><span class="operator">></span>hide(); editor<span class="operator">-</span><span class="operator">></span>setFocus(); <span class="keyword">return</span> <span class="keyword">true</span>; } <span class="keyword">if</span> (ev<span class="operator">-</span><span class="operator">></span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>KeyPress) { bool consumed <span class="operator">=</span> <span class="keyword">false</span>; <span class="type">int</span> key <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtgui/qkeyevent.html">QKeyEvent</a></span><span class="operator">*</span><span class="operator">></span>(ev)<span class="operator">-</span><span class="operator">></span>key(); <span class="keyword">switch</span> (key) { <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Enter: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Return: doneCompletion(); consumed <span class="operator">=</span> <span class="keyword">true</span>; <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Escape: editor<span class="operator">-</span><span class="operator">></span>setFocus(); popup<span class="operator">-</span><span class="operator">></span>hide(); consumed <span class="operator">=</span> <span class="keyword">true</span>; <span class="keyword">break</span>; <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Up: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Down: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_Home: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_End: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_PageUp: <span class="keyword">case</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>Key_PageDown: <span class="keyword">break</span>; <span class="keyword">default</span>: editor<span class="operator">-</span><span class="operator">></span>setFocus(); editor<span class="operator">-</span><span class="operator">></span>event(ev); popup<span class="operator">-</span><span class="operator">></span>hide(); <span class="keyword">break</span>; } <span class="keyword">return</span> consumed; } <span class="keyword">return</span> <span class="keyword">false</span>; } <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>showCompletion(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">></span> <span class="operator">&</span>choices) { <span class="keyword">if</span> (choices<span class="operator">.</span>isEmpty()) <span class="keyword">return</span>; <span class="keyword">const</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span> <span class="operator">&</span>pal <span class="operator">=</span> editor<span class="operator">-</span><span class="operator">></span>palette(); <span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> color <span class="operator">=</span> pal<span class="operator">.</span>color(<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Disabled<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>WindowText); popup<span class="operator">-</span><span class="operator">></span>setUpdatesEnabled(<span class="keyword">false</span>); popup<span class="operator">-</span><span class="operator">></span>clear(); <span class="keyword">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> <span class="operator">&</span>choice : choices) { <span class="keyword">auto</span> item <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QTreeWidgetItem</span>(popup); item<span class="operator">-</span><span class="operator">></span>setText(<span class="number">0</span><span class="operator">,</span> choice); item<span class="operator">-</span><span class="operator">></span>setTextColor(<span class="number">0</span><span class="operator">,</span> color); } popup<span class="operator">-</span><span class="operator">></span>setCurrentItem(popup<span class="operator">-</span><span class="operator">></span>topLevelItem(<span class="number">0</span>)); popup<span class="operator">-</span><span class="operator">></span>resizeColumnToContents(<span class="number">0</span>); popup<span class="operator">-</span><span class="operator">></span>setUpdatesEnabled(<span class="keyword">true</span>); popup<span class="operator">-</span><span class="operator">></span>move(editor<span class="operator">-</span><span class="operator">></span>mapToGlobal(<span class="type"><a href="../qtcore/qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> editor<span class="operator">-</span><span class="operator">></span>height()))); popup<span class="operator">-</span><span class="operator">></span>setFocus(); popup<span class="operator">-</span><span class="operator">></span>show(); } <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>doneCompletion() { timer<span class="operator">.</span>stop(); popup<span class="operator">-</span><span class="operator">></span>hide(); editor<span class="operator">-</span><span class="operator">></span>setFocus(); <span class="type">QTreeWidgetItem</span> <span class="operator">*</span>item <span class="operator">=</span> popup<span class="operator">-</span><span class="operator">></span>currentItem(); <span class="keyword">if</span> (item) { editor<span class="operator">-</span><span class="operator">></span>setText(item<span class="operator">-</span><span class="operator">></span>text(<span class="number">0</span>)); <span class="type"><a href="../qtcore/qmetaobject.html">QMetaObject</a></span><span class="operator">::</span>invokeMethod(editor<span class="operator">,</span> <span class="string">"returnPressed"</span>); } } <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>autoSuggest() { <span class="type"><a href="../qtcore/qstring.html">QString</a></span> str <span class="operator">=</span> editor<span class="operator">-</span><span class="operator">></span>text(); <span class="type"><a href="../qtcore/qstring.html">QString</a></span> url <span class="operator">=</span> gsuggestUrl<span class="operator">.</span>arg(str); networkManager<span class="operator">.</span>get(<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span>(url)); } <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>preventSuggest() { timer<span class="operator">.</span>stop(); } <span class="type">void</span> GSuggestCompletion<span class="operator">::</span>handleNetworkData(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>networkReply) { <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> url <span class="operator">=</span> networkReply<span class="operator">-</span><span class="operator">></span>url(); <span class="keyword">if</span> (networkReply<span class="operator">-</span><span class="operator">></span>error() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">::</span>NoError) { <span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator"><</span><span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">></span> choices; <span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span> response(networkReply<span class="operator">-</span><span class="operator">></span>readAll()); <span class="type"><a href="../qtcore/qxmlstreamreader.html">QXmlStreamReader</a></span> xml(response); <span class="keyword">while</span> (<span class="operator">!</span>xml<span class="operator">.</span>atEnd()) { xml<span class="operator">.</span>readNext(); <span class="keyword">if</span> (xml<span class="operator">.</span>tokenType() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qxmlstreamreader.html">QXmlStreamReader</a></span><span class="operator">::</span>StartElement) <span class="keyword">if</span> (xml<span class="operator">.</span>name() <span class="operator">=</span><span class="operator">=</span> <span class="string">"suggestion"</span>) { <span class="type"><a href="../qtcore/qstringref.html">QStringRef</a></span> str <span class="operator">=</span> xml<span class="operator">.</span>attributes()<span class="operator">.</span>value(<span class="string">"data"</span>); choices <span class="operator"><</span><span class="operator"><</span> str<span class="operator">.</span>toString(); } } showCompletion(choices); } networkReply<span class="operator">-</span><span class="operator">></span>deleteLater(); } </pre> </div> <!-- @@@googlesuggest/googlesuggest.cpp --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2019 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners.<br/> The documentation provided herein is licensed under the terms of the <a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation License version 1.3</a> as published by the Free Software Foundation.<br/> Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. </p> </div> </body> </html>