<?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>Display.qml 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 >Display.qml 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">Display.qml Example File</h1> <span class="subtitle">demos/calqlatr/content/Display.qml</span> <!-- $$$demos/calqlatr/content/Display.qml-description --> <div class="descr"> <a name="details"></a> <pre class="qml"> <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> import QtQuick 2.0 import QtQuick.Window 2.0 <span class="type"><a href="qml-qtquick-item.html">Item</a></span> { <span class="name">id</span>: <span class="name">display</span> property <span class="type">real</span> <span class="name">fontSize</span>: <span class="name">Math</span>.<span class="name">floor</span>(<span class="name">Screen</span>.<span class="name">pixelDensity</span> <span class="operator">*</span> <span class="number">5.0</span>) property <span class="type">bool</span> <span class="name">enteringDigits</span>: <span class="number">false</span> property <span class="type">int</span> <span class="name">maxDigits</span>: (<span class="name">width</span> <span class="operator">/</span> <span class="name">fontSize</span>) <span class="operator">+</span> <span class="number">1</span> property <span class="type">string</span> <span class="name">displayedOperand</span> property <span class="type">string</span> <span class="name">errorString</span>: <span class="name">qsTr</span>(<span class="string">"ERROR"</span>) property <span class="type">bool</span> <span class="name">isError</span>: <span class="name">displayedOperand</span> <span class="operator">===</span> <span class="name">errorString</span> <span class="keyword">function</span> <span class="name">displayOperator</span>(<span class="name">operator</span>) { <span class="name">listView</span>.<span class="name">model</span>.<span class="name">append</span>({ "operator": <span class="name">operator</span>, "operand": <span class="string">""</span> }) <span class="name">enteringDigits</span> <span class="operator">=</span> <span class="number">true</span> <span class="name">listView</span>.<span class="name">positionViewAtEnd</span>() } <span class="keyword">function</span> <span class="name">newLine</span>(<span class="name">operator</span>, operand) { <span class="name">displayedOperand</span> <span class="operator">=</span> <span class="name">displayNumber</span>(<span class="name">operand</span>) <span class="name">listView</span>.<span class="name">model</span>.<span class="name">append</span>({ "operator": <span class="name">operator</span>, "operand": <span class="name">displayedOperand</span> }) <span class="name">enteringDigits</span> <span class="operator">=</span> <span class="number">false</span> <span class="name">listView</span>.<span class="name">positionViewAtEnd</span>() } <span class="keyword">function</span> <span class="name">appendDigit</span>(<span class="name">digit</span>) { <span class="keyword">if</span> (!<span class="name">enteringDigits</span>) <span class="name">listView</span>.<span class="name">model</span>.<span class="name">append</span>({ "operator": <span class="string">""</span>, "operand": <span class="string">""</span> }) var <span class="name">i</span> = <span class="name">listView</span>.<span class="name">model</span>.<span class="name">count</span> <span class="operator">-</span> <span class="number">1</span>; <span class="name">listView</span>.<span class="name">model</span>.<span class="name">get</span>(<span class="name">i</span>).<span class="name">operand</span> <span class="operator">=</span> <span class="name">listView</span>.<span class="name">model</span>.<span class="name">get</span>(<span class="name">i</span>).<span class="name">operand</span> <span class="operator">+</span> <span class="name">digit</span>; <span class="name">enteringDigits</span> <span class="operator">=</span> <span class="number">true</span> <span class="name">listView</span>.<span class="name">positionViewAtEnd</span>() } <span class="keyword">function</span> <span class="name">setDigit</span>(<span class="name">digit</span>) { var <span class="name">i</span> = <span class="name">listView</span>.<span class="name">model</span>.<span class="name">count</span> <span class="operator">-</span> <span class="number">1</span>; <span class="name">listView</span>.<span class="name">model</span>.<span class="name">get</span>(<span class="name">i</span>).<span class="name">operand</span> <span class="operator">=</span> <span class="name">digit</span>; <span class="name">listView</span>.<span class="name">positionViewAtEnd</span>() } <span class="keyword">function</span> <span class="name">clear</span>() { <span class="name">displayedOperand</span> <span class="operator">=</span> <span class="string">""</span> <span class="keyword">if</span> (<span class="name">enteringDigits</span>) { var <span class="name">i</span> = <span class="name">listView</span>.<span class="name">model</span>.<span class="name">count</span> <span class="operator">-</span> <span class="number">1</span> <span class="keyword">if</span> (<span class="name">i</span> <span class="operator">>=</span> <span class="number">0</span>) <span class="name">listView</span>.<span class="name">model</span>.<span class="name">remove</span>(<span class="name">i</span>) <span class="name">enteringDigits</span> <span class="operator">=</span> <span class="number">false</span> } } <span class="comment">// Returns a string representation of a number that fits in</span> <span class="comment">// display.maxDigits characters, trying to keep as much precision</span> <span class="comment">// as possible. If the number cannot be displayed, returns an</span> <span class="comment">// error string.</span> <span class="keyword">function</span> <span class="name">displayNumber</span>(<span class="name">num</span>) { <span class="keyword">if</span> (typeof(<span class="name">num</span>) <span class="operator">!=</span> <span class="string">"number"</span>) <span class="keyword">return</span> <span class="name">errorString</span>; var <span class="name">intNum</span> = <span class="name">parseInt</span>(<span class="name">num</span>); var <span class="name">intLen</span> = <span class="name">intNum</span>.<span class="name">toString</span>().<span class="name">length</span>; <span class="comment">// Do not count the minus sign as a digit</span> var <span class="name">maxLen</span> = <span class="name">num</span> <span class="operator"><</span> <span class="number">0</span> ? <span class="name">maxDigits</span> <span class="operator">+</span> <span class="number">1</span> : <span class="name">maxDigits</span>; <span class="keyword">if</span> (<span class="name">num</span>.<span class="name">toString</span>().<span class="name">length</span> <span class="operator"><=</span> <span class="name">maxLen</span>) { <span class="keyword">if</span> (<span class="name">isFinite</span>(<span class="name">num</span>)) <span class="keyword">return</span> <span class="name">num</span>.<span class="name">toString</span>(); <span class="keyword">return</span> <span class="name">errorString</span>; } <span class="comment">// Integer part of the number is too long - try</span> <span class="comment">// an exponential notation</span> <span class="keyword">if</span> (<span class="name">intNum</span> <span class="operator">==</span> <span class="name">num</span> <span class="operator">||</span> <span class="name">intLen</span> <span class="operator">></span> <span class="name">maxLen</span> <span class="operator">-</span> <span class="number">3</span>) { var <span class="name">expVal</span> = <span class="name">num</span>.<span class="name">toExponential</span>(<span class="name">maxDigits</span> <span class="operator">-</span> <span class="number">6</span>).<span class="name">toString</span>(); <span class="keyword">if</span> (<span class="name">expVal</span>.<span class="name">length</span> <span class="operator"><=</span> <span class="name">maxLen</span>) <span class="keyword">return</span> <span class="name">expVal</span>; } <span class="comment">// Try a float presentation with fixed number of digits</span> var <span class="name">floatStr</span> = <span class="name">parseFloat</span>(<span class="name">num</span>).<span class="name">toFixed</span>(<span class="name">maxDigits</span> <span class="operator">-</span> <span class="name">intLen</span> <span class="operator">-</span> <span class="number">1</span>).<span class="name">toString</span>(); <span class="keyword">if</span> (<span class="name">floatStr</span>.<span class="name">length</span> <span class="operator"><=</span> <span class="name">maxLen</span>) <span class="keyword">return</span> <span class="name">floatStr</span>; <span class="keyword">return</span> <span class="name">errorString</span>; } <span class="type"><a href="qml-qtquick-item.html">Item</a></span> { <span class="name">id</span>: <span class="name">theItem</span> <span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span> <span class="operator">+</span> <span class="number">32</span> <span class="name">height</span>: <span class="name">parent</span>.<span class="name">height</span> <span class="type"><a href="qml-qtquick-rectangle.html">Rectangle</a></span> { <span class="name">id</span>: <span class="name">rect</span> <span class="name">x</span>: <span class="number">16</span> <span class="name">color</span>: <span class="string">"white"</span> <span class="name">height</span>: <span class="name">parent</span>.<span class="name">height</span> <span class="name">width</span>: <span class="name">display</span>.<span class="name">width</span> <span class="operator">-</span> <span class="number">16</span> } <span class="type"><a href="qml-qtquick-image.html">Image</a></span> { <span class="name">anchors</span>.right: <span class="name">rect</span>.<span class="name">left</span> <span class="name">source</span>: <span class="string">"images/paper-edge-left.png"</span> <span class="name">height</span>: <span class="name">parent</span>.<span class="name">height</span> <span class="name">fillMode</span>: <span class="name">Image</span>.<span class="name">TileVertically</span> } <span class="type"><a href="qml-qtquick-image.html">Image</a></span> { <span class="name">anchors</span>.left: <span class="name">rect</span>.<span class="name">right</span> <span class="name">source</span>: <span class="string">"images/paper-edge-right.png"</span> <span class="name">height</span>: <span class="name">parent</span>.<span class="name">height</span> <span class="name">fillMode</span>: <span class="name">Image</span>.<span class="name">TileVertically</span> } <span class="type"><a href="qml-qtquick-image.html">Image</a></span> { <span class="name">id</span>: <span class="name">grip</span> <span class="name">source</span>: <span class="string">"images/paper-grip.png"</span> <span class="name">anchors</span>.horizontalCenter: <span class="name">parent</span>.<span class="name">horizontalCenter</span> <span class="name">anchors</span>.bottom: <span class="name">parent</span>.<span class="name">bottom</span> <span class="name">anchors</span>.bottomMargin: <span class="number">20</span> } <span class="type"><a href="qml-qtquick-listview.html">ListView</a></span> { <span class="name">id</span>: <span class="name">listView</span> <span class="name">x</span>: <span class="number">16</span>; <span class="name">y</span>: <span class="number">30</span> <span class="name">width</span>: <span class="name">display</span>.<span class="name">width</span> <span class="name">height</span>: <span class="name">display</span>.<span class="name">height</span> <span class="operator">-</span> <span class="number">50</span> <span class="operator">-</span> <span class="name">y</span> <span class="name">delegate</span>: <span class="name">Item</span> { <span class="name">height</span>: <span class="name">display</span>.<span class="name">fontSize</span> <span class="operator">*</span> <span class="number">1.1</span> <span class="name">width</span>: <span class="name">parent</span>.<span class="name">width</span> <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">id</span>: <span class="name">operator</span> <span class="name">x</span>: <span class="number">6</span> <span class="name">font</span>.pixelSize: <span class="name">display</span>.<span class="name">fontSize</span> <span class="name">color</span>: <span class="string">"#6da43d"</span> <span class="name">text</span>: <span class="name">model</span>.<span class="name">operator</span> } <span class="type"><a href="qml-qtquick-text.html">Text</a></span> { <span class="name">id</span>: <span class="name">operand</span> <span class="name">font</span>.pixelSize: <span class="name">display</span>.<span class="name">fontSize</span> <span class="name">anchors</span>.right: <span class="name">parent</span>.<span class="name">right</span> <span class="name">anchors</span>.rightMargin: <span class="number">22</span> <span class="name">text</span>: <span class="name">model</span>.<span class="name">operand</span> } } <span class="name">model</span>: <span class="name">ListModel</span> { } } } } </pre> </div> <!-- @@@demos/calqlatr/content/Display.qml --> </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>