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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<title>Qt 4.8: gradients.h Example File (demos/gradients/gradients.h)</title>
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<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
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<h1 class="title">gradients.h Example File</h1>
<span class="small-subtitle">demos/gradients/gradients.h</span>
<!-- $$$demos/gradients/gradients.h-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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**
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** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#ifndef GRADIENTS_H</span>
<span class="preprocessor">#define GRADIENTS_H</span>
<span class="preprocessor">#include "arthurwidgets.h"</span>
<span class="preprocessor">#include <QtGui></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="qgradient.html#QGradientStops-typedef">QGradientStops</a></span> <span class="operator">&</span>stops);
<span class="type">void</span> paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>e);
<span class="type"><a href="qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="qsize.html">QSize</a></span>(<span class="number">150</span><span class="operator">,</span> <span class="number">40</span>); }
<span class="type"><a href="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="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="qimage.html">QImage</a></span> m_shade;
HoverPoints <span class="operator">*</span>m_hoverPoints;
<span class="type"><a href="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="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="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="qpainter.html">QPainter</a></span> <span class="operator">*</span>p);
<span class="type"><a href="qsize.html">QSize</a></span> sizeHint() <span class="keyword">const</span> { <span class="keyword">return</span> <span class="type"><a href="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="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>e);
<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="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="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="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="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="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="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="qt.html">Qt</a></span><span class="operator">::</span>ConicalGradientPattern; update(); }
<span class="keyword">private</span>:
<span class="type"><a href="qgradient.html#QGradientStops-typedef">QGradientStops</a></span> m_stops;
HoverPoints <span class="operator">*</span>m_hoverPoints;
<span class="type"><a href="qgradient.html">QGradient</a></span><span class="operator">::</span>Spread m_spread;
<span class="type"><a href="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="keyword">private</span>:
<span class="type">void</span> setDefault(<span class="type">int</span> i);
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="preprocessor">#endif // GRADIENTS_H</span></pre>
</div>
<!-- @@@demos/gradients/gradients.h -->
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