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<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."
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** $QT_END_LICENSE$
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****************************************************************************/</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>
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<!-- @@@demos/calqlatr/content/calculator.js -->
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<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
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distrib
>
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x86_64
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media
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core-updates
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by-pkgid
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1184
