<?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>gradients.h Example File | Qt Widgets 5.12.2</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="qtwidgets-index.html">Qt Widgets</a></td><td ><a href="qtwidgets-painting-gradients-example.html">Gradients</a></td><td >gradients.h Example File</td></tr></table><table class="buildversion"><tr> <td id="buildversion" width="100%" align="right"><a href="qtwidgets-index.html">Qt 5.12.2 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">gradients.h Example File</h1> <span class="subtitle">painting/gradients/gradients.h</span> <!-- $$$painting/gradients/gradients.h-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 demonstration applications 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">#ifndef GRADIENTS_H</span> <span class="preprocessor">#define GRADIENTS_H</span> <span class="preprocessor">#include "arthurwidgets.h"</span> <span class="keyword">class</span> <span class="type"><a href="qradiobutton.html">QRadioButton</a></span>; <span class="keyword">class</span> HoverPoints; <span class="keyword">class</span> ShadeWidget : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { Q_OBJECT <span class="keyword">public</span>: <span class="keyword">enum</span> ShadeType { RedShade<span class="operator">,</span> GreenShade<span class="operator">,</span> BlueShade<span class="operator">,</span> ARGBShade }; ShadeWidget(ShadeType type<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent); <span class="type">void</span> setGradientStops(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&</span>stops); <span class="type">void</span> paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>e) override; <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span> override { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">150</span><span class="operator">,</span> <span class="number">40</span>); } <span class="type"><a href="../qtgui/qpolygonf.html">QPolygonF</a></span> points() <span class="keyword">const</span>; HoverPoints <span class="operator">*</span>hoverPoints() <span class="keyword">const</span> { <span class="keyword">return</span> m_hoverPoints; } <span class="type"><a href="../qtcore/qtglobal.html#uint-typedef">uint</a></span> colorAt(<span class="type">int</span> x); <span class="keyword">signals</span>: <span class="type">void</span> colorsChanged(); <span class="keyword">private</span>: <span class="type">void</span> generateShade(); ShadeType m_shade_type; <span class="type"><a href="../qtgui/qimage.html">QImage</a></span> m_shade; HoverPoints <span class="operator">*</span>m_hoverPoints; <span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> m_alpha_gradient; }; <span class="keyword">class</span> GradientEditor : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { Q_OBJECT <span class="keyword">public</span>: GradientEditor(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent); <span class="type">void</span> setGradientStops(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&</span>stops); <span class="keyword">public</span> <span class="keyword">slots</span>: <span class="type">void</span> pointsUpdated(); <span class="keyword">signals</span>: <span class="type">void</span> gradientStopsChanged(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&</span>stops); <span class="keyword">private</span>: ShadeWidget <span class="operator">*</span>m_red_shade; ShadeWidget <span class="operator">*</span>m_green_shade; ShadeWidget <span class="operator">*</span>m_blue_shade; ShadeWidget <span class="operator">*</span>m_alpha_shade; }; <span class="keyword">class</span> GradientRenderer : <span class="keyword">public</span> ArthurFrame { Q_OBJECT <span class="keyword">public</span>: GradientRenderer(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent); <span class="type">void</span> paint(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> <span class="operator">*</span>p) override; <span class="type"><a href="../qtcore/qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span> override { <span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>(<span class="number">400</span><span class="operator">,</span> <span class="number">400</span>); } HoverPoints <span class="operator">*</span>hoverPoints() <span class="keyword">const</span> { <span class="keyword">return</span> m_hoverPoints; } <span class="type">void</span> mousePressEvent(<span class="type"><a href="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>e) override; <span class="keyword">public</span> <span class="keyword">slots</span>: <span class="type">void</span> setGradientStops(<span class="keyword">const</span> <span class="type"><a href="../qtgui/qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&</span>stops); <span class="type">void</span> setPadSpread() { m_spread <span class="operator">=</span> <span class="type"><a href="../qtgui/qgradient.html">QGradient</a></span><span class="operator">::</span>PadSpread; update(); } <span class="type">void</span> setRepeatSpread() { m_spread <span class="operator">=</span> <span class="type"><a href="../qtgui/qgradient.html">QGradient</a></span><span class="operator">::</span>RepeatSpread; update(); } <span class="type">void</span> setReflectSpread() { m_spread <span class="operator">=</span> <span class="type"><a href="../qtgui/qgradient.html">QGradient</a></span><span class="operator">::</span>ReflectSpread; update(); } <span class="type">void</span> setLinearGradient() { m_gradientType <span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>LinearGradientPattern; update(); } <span class="type">void</span> setRadialGradient() { m_gradientType <span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>RadialGradientPattern; update(); } <span class="type">void</span> setConicalGradient() { m_gradientType <span class="operator">=</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>ConicalGradientPattern; update(); } <span class="keyword">private</span>: <span class="type"><a href="../qtgui/qgradient.html#QGradientStops-typedef">QGradientStops</a></span> m_stops; HoverPoints <span class="operator">*</span>m_hoverPoints; <span class="type"><a href="../qtgui/qgradient.html">QGradient</a></span><span class="operator">::</span>Spread m_spread; <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>BrushStyle m_gradientType; }; <span class="keyword">class</span> GradientWidget : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span> { Q_OBJECT <span class="keyword">public</span>: GradientWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent); <span class="keyword">public</span> <span class="keyword">slots</span>: <span class="type">void</span> setDefault1() { setDefault(<span class="number">1</span>); } <span class="type">void</span> setDefault2() { setDefault(<span class="number">2</span>); } <span class="type">void</span> setDefault3() { setDefault(<span class="number">3</span>); } <span class="type">void</span> setDefault4() { setDefault(<span class="number">4</span>); } <span class="type">void</span> setPreset() { changePresetBy(<span class="number">0</span>); } <span class="type">void</span> setPrevPreset() { changePresetBy(<span class="operator">-</span><span class="number">1</span>); } <span class="type">void</span> setNextPreset() { changePresetBy(<span class="number">1</span>); } <span class="keyword">private</span>: <span class="type">void</span> setDefault(<span class="type">int</span> i); <span class="type">void</span> updatePresetName(); <span class="type">void</span> changePresetBy(<span class="type">int</span> indexOffset); GradientRenderer <span class="operator">*</span>m_renderer; GradientEditor <span class="operator">*</span>m_editor; <span class="type"><a href="qradiobutton.html">QRadioButton</a></span> <span class="operator">*</span>m_linearButton; <span class="type"><a href="qradiobutton.html">QRadioButton</a></span> <span class="operator">*</span>m_radialButton; <span class="type"><a href="qradiobutton.html">QRadioButton</a></span> <span class="operator">*</span>m_conicalButton; <span class="type"><a href="qradiobutton.html">QRadioButton</a></span> <span class="operator">*</span>m_padSpreadButton; <span class="type"><a href="qradiobutton.html">QRadioButton</a></span> <span class="operator">*</span>m_reflectSpreadButton; <span class="type"><a href="qradiobutton.html">QRadioButton</a></span> <span class="operator">*</span>m_repeatSpreadButton; <span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>m_presetButton; <span class="type">int</span> m_presetIndex <span class="operator">=</span> <span class="number">0</span>; }; <span class="preprocessor">#endif // GRADIENTS_H</span> </pre> </div> <!-- @@@painting/gradients/gradients.h --> </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>