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<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) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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
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** 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
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** $QT_END_LICENSE$
**
****************************************************************************/</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>
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