<?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>calculator.js Example File | Qt Quick 5.9</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 5.9</td><td ><a href="qtquick-index.html">Qt Quick</a></td><td ><a href="qtquick-demos-calqlatr-example.html">Qt Quick Demo - Calqlatr</a></td><td >calculator.js Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</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">calculator.js Example File</h1> <span class="subtitle">demos/calqlatr/content/calculator.js</span> <!-- $$$demos/calqlatr/content/calculator.js-description --> <div class="descr"> <a name="details"></a> <pre class="js"> <span class="comment">/**************************************************************************** ** ** Copyright (C) 2017 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> var <span class="name">curVal</span> = <span class="number">0</span> var <span class="name">memory</span> = <span class="number">0</span> var <span class="name">lastOp</span> = <span class="string">""</span> var <span class="name">previousOperator</span> = <span class="string">""</span> var <span class="name">digits</span> = <span class="string">""</span> <span class="keyword">function</span> <span class="name">disabled</span>(<span class="name">op</span>) { <span class="keyword">if</span> (<span class="name">digits</span> <span class="operator">==</span> <span class="string">""</span> <span class="operator">&&</span> !((<span class="name">op</span> <span class="operator">>=</span> <span class="string">"0"</span> <span class="operator">&&</span> <span class="name">op</span> <span class="operator"><=</span> <span class="string">"9"</span>) <span class="operator">||</span> <span class="name">op</span> <span class="operator">==</span> <span class="string">"."</span>)) <span class="keyword">return</span> <span class="number">true</span> <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">'='</span> <span class="operator">&&</span> <span class="name">previousOperator</span>.<span class="name">length</span> <span class="operator">!=</span> <span class="number">1</span>) <span class="keyword">return</span> <span class="number">true</span> <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"."</span> <span class="operator">&&</span> <span class="name">digits</span>.<span class="name">toString</span>().<span class="name">search</span>(/\./) <span class="operator">!=</span> -<span class="number">1</span>) { <span class="keyword">return</span> <span class="number">true</span> } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"���"</span> <span class="operator">&&</span> <span class="name">digits</span>.<span class="name">toString</span>().<span class="name">search</span>(/-/) <span class="operator">!=</span> -<span class="number">1</span>) { <span class="keyword">return</span> <span class="number">true</span> } <span class="keyword">else</span> { <span class="keyword">return</span> <span class="number">false</span> } } <span class="keyword">function</span> <span class="name">digitPressed</span>(<span class="name">op</span>) { <span class="keyword">if</span> (<span class="name">disabled</span>(<span class="name">op</span>)) <span class="keyword">return</span> <span class="keyword">if</span> (<span class="name">digits</span>.<span class="name">toString</span>().<span class="name">length</span> <span class="operator">>=</span> <span class="name">display</span>.<span class="name">maxDigits</span>) <span class="keyword">return</span> <span class="keyword">if</span> (<span class="name">lastOp</span>.<span class="name">toString</span>().<span class="name">length</span> <span class="operator">==</span> <span class="number">1</span> <span class="operator">&&</span> ((<span class="name">lastOp</span> <span class="operator">>=</span> <span class="string">"0"</span> <span class="operator">&&</span> <span class="name">lastOp</span> <span class="operator"><=</span> <span class="string">"9"</span>) <span class="operator">||</span> <span class="name">lastOp</span> <span class="operator">==</span> <span class="string">"."</span>) ) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">digits</span> <span class="operator">+</span> <span class="name">op</span>.<span class="name">toString</span>() <span class="name">display</span>.<span class="name">appendDigit</span>(<span class="name">op</span>.<span class="name">toString</span>()) } <span class="keyword">else</span> { <span class="name">digits</span> <span class="operator">=</span> <span class="name">op</span> <span class="name">display</span>.<span class="name">appendDigit</span>(<span class="name">op</span>.<span class="name">toString</span>()) } <span class="name">lastOp</span> <span class="operator">=</span> <span class="name">op</span> } <span class="keyword">function</span> <span class="name">operatorPressed</span>(<span class="name">op</span>) { <span class="keyword">if</span> (<span class="name">disabled</span>(<span class="name">op</span>)) <span class="keyword">return</span> <span class="name">lastOp</span> <span class="operator">=</span> <span class="name">op</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"��"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">digits</span>.<span class="name">valueOf</span>() <span class="operator">*</span> -<span class="number">1</span>) <span class="name">display</span>.<span class="name">setDigit</span>(<span class="name">display</span>.<span class="name">displayNumber</span>(<span class="name">digits</span>)) <span class="keyword">return</span> } <span class="keyword">if</span> (<span class="name">previousOperator</span> <span class="operator">==</span> <span class="string">"+"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">digits</span>.<span class="name">valueOf</span>()) <span class="operator">+</span> <span class="name">Number</span>(<span class="name">curVal</span>.<span class="name">valueOf</span>()) } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">previousOperator</span> <span class="operator">==</span> <span class="string">"���"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">curVal</span>.<span class="name">valueOf</span>()) <span class="operator">-</span> <span class="name">Number</span>(<span class="name">digits</span>.<span class="name">valueOf</span>()) } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">previousOperator</span> <span class="operator">==</span> <span class="string">"��"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">curVal</span>) <span class="operator">*</span> <span class="name">Number</span>(<span class="name">digits</span>.<span class="name">valueOf</span>()) } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">previousOperator</span> <span class="operator">==</span> <span class="string">"��"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">curVal</span>) <span class="operator">/</span> <span class="name">Number</span>(<span class="name">digits</span>.<span class="name">valueOf</span>()) } <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"+"</span> <span class="operator">||</span> <span class="name">op</span> <span class="operator">==</span> <span class="string">"���"</span> <span class="operator">||</span> <span class="name">op</span> <span class="operator">==</span> <span class="string">"��"</span> <span class="operator">||</span> <span class="name">op</span> <span class="operator">==</span> <span class="string">"��"</span>) { <span class="name">previousOperator</span> <span class="operator">=</span> <span class="name">op</span> <span class="name">curVal</span> <span class="operator">=</span> <span class="name">digits</span>.<span class="name">valueOf</span>() <span class="name">digits</span> <span class="operator">=</span> <span class="string">""</span> <span class="name">display</span>.<span class="name">displayOperator</span>(<span class="name">previousOperator</span>) <span class="keyword">return</span> } <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"="</span>) { <span class="name">display</span>.<span class="name">newLine</span>(<span class="string">"="</span>, <span class="name">digits</span>.<span class="name">valueOf</span>()) } <span class="name">curVal</span> <span class="operator">=</span> <span class="number">0</span> <span class="name">previousOperator</span> <span class="operator">=</span> <span class="string">""</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"1/x"</span>) { <span class="name">digits</span> <span class="operator">=</span> (<span class="number">1</span> <span class="operator">/</span> <span class="name">digits</span>.<span class="name">valueOf</span>()).<span class="name">toString</span>() } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"x^2"</span>) { <span class="name">digits</span> <span class="operator">=</span> (<span class="name">digits</span>.<span class="name">valueOf</span>() <span class="operator">*</span> <span class="name">digits</span>.<span class="name">valueOf</span>()).<span class="name">toString</span>() } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"Abs"</span>) { <span class="name">digits</span> <span class="operator">=</span> (<span class="name">Math</span>.<span class="name">abs</span>(<span class="name">digits</span>.<span class="name">valueOf</span>())).<span class="name">toString</span>() } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"Int"</span>) { <span class="name">digits</span> <span class="operator">=</span> (<span class="name">Math</span>.<span class="name">floor</span>(<span class="name">digits</span>.<span class="name">valueOf</span>())).<span class="name">toString</span>() } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"���"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">Number</span>(<span class="name">Math</span>.<span class="name">sqrt</span>(<span class="name">digits</span>.<span class="name">valueOf</span>())) <span class="name">display</span>.<span class="name">newLine</span>(<span class="string">"���"</span>, <span class="name">digits</span>.<span class="name">valueOf</span>()) } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"mc"</span>) { <span class="name">memory</span> <span class="operator">=</span> <span class="number">0</span>; } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"m+"</span>) { <span class="name">memory</span> <span class="operator">+=</span> <span class="name">digits</span>.<span class="name">valueOf</span>() } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"mr"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">memory</span>.<span class="name">toString</span>() } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"m-"</span>) { <span class="name">memory</span> <span class="operator">=</span> <span class="name">digits</span>.<span class="name">valueOf</span>() } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"backspace"</span>) { <span class="name">digits</span> <span class="operator">=</span> <span class="name">digits</span>.<span class="name">toString</span>().<span class="name">slice</span>(<span class="number">0</span>, -<span class="number">1</span>) <span class="name">display</span>.<span class="name">clear</span>() <span class="name">display</span>.<span class="name">appendDigit</span>(<span class="name">digits</span>) } <span class="keyword">else</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"Off"</span>) { <span class="name">Qt</span>.<span class="name">quit</span>(); } <span class="comment">// Reset the state on 'C' operator or after</span> <span class="comment">// an error occurred</span> <span class="keyword">if</span> (<span class="name">op</span> <span class="operator">==</span> <span class="string">"C"</span> <span class="operator">||</span> <span class="name">display</span>.<span class="name">isError</span>) { <span class="name">display</span>.<span class="name">clear</span>() <span class="name">curVal</span> <span class="operator">=</span> <span class="number">0</span> <span class="name">memory</span> <span class="operator">=</span> <span class="number">0</span> <span class="name">lastOp</span> <span class="operator">=</span> <span class="string">""</span> <span class="name">digits</span> <span class="operator">=</span> <span class="string">""</span> } } </pre> </div> <!-- @@@demos/calqlatr/content/calculator.js --> </div> </div> </div> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2017 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>