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<h1 class="title">wheelwidget.cpp Example File</h1>
<span class="subtitle">webkitwidgets/scroller/wheel/wheelwidget.cpp</span>
<!-- $$$webkitwidgets/scroller/wheel/wheelwidget.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"><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
** 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">#include <QtWidgets></span>
<span class="preprocessor">#include "wheelwidget.h"</span>
<span class="preprocessor">#define WHEEL_SCROLL_OFFSET 50000.0</span>
AbstractWheelWidget<span class="operator">::</span>AbstractWheelWidget(bool touch<span class="operator">,</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span>(parent)
<span class="operator">,</span> m_currentItem(<span class="number">0</span>)
<span class="operator">,</span> m_itemOffset(<span class="number">0</span>)
{
<span class="comment">// ![0]</span>
<span class="type"><a href="../qtwidgets/qscroller.html">QScroller</a></span><span class="operator">::</span>grabGesture(<span class="keyword">this</span><span class="operator">,</span> touch <span class="operator">?</span> <span class="type"><a href="../qtwidgets/qscroller.html">QScroller</a></span><span class="operator">::</span>TouchGesture : <span class="type"><a href="../qtwidgets/qscroller.html">QScroller</a></span><span class="operator">::</span>LeftMouseButtonGesture);
<span class="comment">// ![0]</span>
}
AbstractWheelWidget<span class="operator">::</span><span class="operator">~</span>AbstractWheelWidget()
{ }
<span class="type">int</span> AbstractWheelWidget<span class="operator">::</span>currentIndex() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_currentItem;
}
<span class="type">void</span> AbstractWheelWidget<span class="operator">::</span>setCurrentIndex(<span class="type">int</span> index)
{
<span class="keyword">if</span> (index <span class="operator">></span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> index <span class="operator"><</span> itemCount()) {
m_currentItem <span class="operator">=</span> index;
m_itemOffset <span class="operator">=</span> <span class="number">0</span>;
update();
}
}
bool AbstractWheelWidget<span class="operator">::</span>event(<span class="type"><a href="../qtcore/qevent.html">QEvent</a></span> <span class="operator">*</span>e)
{
<span class="keyword">switch</span> (e<span class="operator">-</span><span class="operator">></span>type()) {
<span class="comment">// ![1]</span>
<span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>ScrollPrepare:
{
<span class="comment">// We set the snap positions as late as possible so that we are sure</span>
<span class="comment">// we get the correct itemHeight</span>
<span class="type"><a href="../qtwidgets/qscroller.html">QScroller</a></span> <span class="operator">*</span>scroller <span class="operator">=</span> <span class="type"><a href="../qtwidgets/qscroller.html">QScroller</a></span><span class="operator">::</span>scroller(<span class="keyword">this</span>);
scroller<span class="operator">-</span><span class="operator">></span>setSnapPositionsY( WHEEL_SCROLL_OFFSET<span class="operator">,</span> itemHeight() );
<span class="type"><a href="../qtgui/qscrollprepareevent.html">QScrollPrepareEvent</a></span> <span class="operator">*</span>se <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtgui/qscrollprepareevent.html">QScrollPrepareEvent</a></span> <span class="operator">*</span><span class="operator">></span>(e);
se<span class="operator">-</span><span class="operator">></span>setViewportSize(<span class="type"><a href="../qtcore/qsizef.html">QSizeF</a></span>(size()));
<span class="comment">// we claim a huge scrolling area and a huge content position and</span>
<span class="comment">// hope that the user doesn't notice that the scroll area is restricted</span>
se<span class="operator">-</span><span class="operator">></span>setContentPosRange(<span class="type"><a href="../qtcore/qrectf.html">QRectF</a></span>(<span class="number">0.0</span><span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> <span class="number">0.0</span><span class="operator">,</span> WHEEL_SCROLL_OFFSET <span class="operator">*</span> <span class="number">2</span>));
se<span class="operator">-</span><span class="operator">></span>setContentPos(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0.0</span><span class="operator">,</span> WHEEL_SCROLL_OFFSET <span class="operator">+</span> m_currentItem <span class="operator">*</span> itemHeight() <span class="operator">+</span> m_itemOffset));
se<span class="operator">-</span><span class="operator">></span>accept();
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="comment">// ![1]</span>
<span class="comment">// ![2]</span>
<span class="keyword">case</span> <span class="type"><a href="../qtcore/qevent.html">QEvent</a></span><span class="operator">::</span>Scroll:
{
<span class="type"><a href="../qtgui/qscrollevent.html">QScrollEvent</a></span> <span class="operator">*</span>se <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator"><</span><span class="type"><a href="../qtgui/qscrollevent.html">QScrollEvent</a></span> <span class="operator">*</span><span class="operator">></span>(e);
<span class="type"><a href="../qtcore/qtglobal.html#qreal-typedef">qreal</a></span> y <span class="operator">=</span> se<span class="operator">-</span><span class="operator">></span>contentPos()<span class="operator">.</span>y();
<span class="type">int</span> iy <span class="operator">=</span> y <span class="operator">-</span> WHEEL_SCROLL_OFFSET;
<span class="type">int</span> ih <span class="operator">=</span> itemHeight();
<span class="comment">// ![2]</span>
<span class="comment">// ![3]</span>
<span class="comment">// -- calculate the current item position and offset and redraw the widget</span>
<span class="type">int</span> ic <span class="operator">=</span> itemCount();
<span class="keyword">if</span> (ic<span class="operator">></span><span class="number">0</span>) {
m_currentItem <span class="operator">=</span> iy <span class="operator">/</span> ih <span class="operator">%</span> ic;
m_itemOffset <span class="operator">=</span> iy <span class="operator">%</span> ih;
<span class="comment">// take care when scrolling backwards. Modulo returns negative numbers</span>
<span class="keyword">if</span> (m_itemOffset <span class="operator"><</span> <span class="number">0</span>) {
m_itemOffset <span class="operator">+</span><span class="operator">=</span> ih;
m_currentItem<span class="operator">-</span><span class="operator">-</span>;
}
<span class="keyword">if</span> (m_currentItem <span class="operator"><</span> <span class="number">0</span>)
m_currentItem <span class="operator">+</span><span class="operator">=</span> ic;
}
<span class="comment">// -- repaint</span>
update();
se<span class="operator">-</span><span class="operator">></span>accept();
<span class="keyword">return</span> <span class="keyword">true</span>;
<span class="comment">// ![3]</span>
}
<span class="keyword">default</span>:
<span class="keyword">return</span> <span class="type"><a href="../qtwidgets/qwidget.html">QWidget</a></span><span class="operator">::</span>event(e);
}
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">void</span> AbstractWheelWidget<span class="operator">::</span>paintEvent(<span class="type"><a href="../qtgui/qpaintevent.html">QPaintEvent</a></span><span class="operator">*</span> event)
{
Q_UNUSED( event );
<span class="comment">// -- first calculate size and position.</span>
<span class="type">int</span> w <span class="operator">=</span> width();
<span class="type">int</span> h <span class="operator">=</span> height();
<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span> painter(<span class="keyword">this</span>);
<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span> palette <span class="operator">=</span> <span class="type"><a href="../qtwidgets/qapplication.html">QApplication</a></span><span class="operator">::</span>palette();
<span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>ColorGroup colorGroup <span class="operator">=</span> isEnabled() <span class="operator">?</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Active : <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Disabled;
<span class="comment">// linear gradient brush</span>
<span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> grad(<span class="number">0.5</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0.5</span><span class="operator">,</span> <span class="number">1.0</span>);
grad<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>ButtonText));
grad<span class="operator">.</span>setColorAt(<span class="number">0.2</span><span class="operator">,</span> palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Button));
grad<span class="operator">.</span>setColorAt(<span class="number">0.8</span><span class="operator">,</span> palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Button));
grad<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>ButtonText));
grad<span class="operator">.</span>setCoordinateMode( <span class="type"><a href="../qtgui/qgradient.html">QGradient</a></span><span class="operator">::</span>ObjectBoundingMode );
<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span> gBrush( grad );
<span class="comment">// paint a border and background</span>
painter<span class="operator">.</span>setPen(palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>ButtonText));
painter<span class="operator">.</span>setBrush(gBrush);
<span class="comment">// painter.setBrushOrigin( QPointF( 0.0, 0.0 ) );</span>
painter<span class="operator">.</span>drawRect( <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> w<span class="operator">-</span><span class="number">1</span><span class="operator">,</span> h<span class="operator">-</span><span class="number">1</span> );
<span class="comment">// paint inner border</span>
painter<span class="operator">.</span>setPen(palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Button));
painter<span class="operator">.</span>setBrush(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
painter<span class="operator">.</span>drawRect( <span class="number">1</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> w<span class="operator">-</span><span class="number">3</span><span class="operator">,</span> h<span class="operator">-</span><span class="number">3</span> );
<span class="comment">// paint the items</span>
painter<span class="operator">.</span>setClipRect( <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>( <span class="number">3</span><span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> w<span class="operator">-</span><span class="number">6</span><span class="operator">,</span> h<span class="operator">-</span><span class="number">6</span> ) );
painter<span class="operator">.</span>setPen(palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>ButtonText));
<span class="type">int</span> iH <span class="operator">=</span> itemHeight();
<span class="type">int</span> iC <span class="operator">=</span> itemCount();
<span class="keyword">if</span> (iC <span class="operator">></span> <span class="number">0</span>) {
m_itemOffset <span class="operator">=</span> m_itemOffset <span class="operator">%</span> iH;
<span class="keyword">for</span> (<span class="type">int</span> i<span class="operator">=</span><span class="operator">-</span>h<span class="operator">/</span><span class="number">2</span><span class="operator">/</span>iH; i<span class="operator"><</span><span class="operator">=</span>h<span class="operator">/</span><span class="number">2</span><span class="operator">/</span>iH<span class="operator">+</span><span class="number">1</span>; i<span class="operator">+</span><span class="operator">+</span>) {
<span class="type">int</span> itemNum <span class="operator">=</span> m_currentItem <span class="operator">+</span> i;
<span class="keyword">while</span> (itemNum <span class="operator"><</span> <span class="number">0</span>)
itemNum <span class="operator">+</span><span class="operator">=</span> iC;
<span class="keyword">while</span> (itemNum <span class="operator">></span><span class="operator">=</span> iC)
itemNum <span class="operator">-</span><span class="operator">=</span> iC;
paintItem(<span class="operator">&</span>painter<span class="operator">,</span> itemNum<span class="operator">,</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>(<span class="number">6</span><span class="operator">,</span> h<span class="operator">/</span><span class="number">2</span> <span class="operator">+</span>i<span class="operator">*</span>iH <span class="operator">-</span> m_itemOffset <span class="operator">-</span> iH<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> w<span class="operator">-</span><span class="number">6</span><span class="operator">,</span> iH ));
}
}
<span class="comment">// draw a transparent bar over the center</span>
<span class="type"><a href="../qtgui/qcolor.html">QColor</a></span> highlight <span class="operator">=</span> palette<span class="operator">.</span>color(colorGroup<span class="operator">,</span> <span class="type"><a href="../qtgui/qpalette.html">QPalette</a></span><span class="operator">::</span>Highlight);
highlight<span class="operator">.</span>setAlpha(<span class="number">150</span>);
<span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> grad2(<span class="number">0.5</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0.5</span><span class="operator">,</span> <span class="number">1.0</span>);
grad2<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> highlight);
grad2<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> highlight<span class="operator">.</span>lighter());
grad2<span class="operator">.</span>setCoordinateMode( <span class="type"><a href="../qtgui/qgradient.html">QGradient</a></span><span class="operator">::</span>ObjectBoundingMode );
<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span> gBrush2( grad2 );
<span class="type"><a href="../qtgui/qlineargradient.html">QLinearGradient</a></span> grad3(<span class="number">0.5</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0.5</span><span class="operator">,</span> <span class="number">1.0</span>);
grad3<span class="operator">.</span>setColorAt(<span class="number">0</span><span class="operator">,</span> highlight);
grad3<span class="operator">.</span>setColorAt(<span class="number">1.0</span><span class="operator">,</span> highlight<span class="operator">.</span>darker());
grad3<span class="operator">.</span>setCoordinateMode( <span class="type"><a href="../qtgui/qgradient.html">QGradient</a></span><span class="operator">::</span>ObjectBoundingMode );
<span class="type"><a href="../qtgui/qbrush.html">QBrush</a></span> gBrush3( grad3 );
painter<span class="operator">.</span>fillRect( <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>( <span class="number">0</span><span class="operator">,</span> h<span class="operator">/</span><span class="number">2</span> <span class="operator">-</span> iH<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> w<span class="operator">,</span> iH<span class="operator">/</span><span class="number">2</span> )<span class="operator">,</span> gBrush2 );
painter<span class="operator">.</span>fillRect( <span class="type"><a href="../qtcore/qrect.html">QRect</a></span>( <span class="number">0</span><span class="operator">,</span> h<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> w<span class="operator">,</span> iH<span class="operator">/</span><span class="number">2</span> )<span class="operator">,</span> gBrush3 );
}
<span class="comment">/*!
Rotates the wheel widget to a given index.
You can also give an index greater than itemCount or less than zero in which
case the wheel widget will scroll in the given direction and end up with
(index % itemCount)
*/</span>
<span class="type">void</span> AbstractWheelWidget<span class="operator">::</span>scrollTo(<span class="type">int</span> index)
{
<span class="type"><a href="../qtwidgets/qscroller.html">QScroller</a></span> <span class="operator">*</span>scroller <span class="operator">=</span> <span class="type"><a href="../qtwidgets/qscroller.html">QScroller</a></span><span class="operator">::</span>scroller(<span class="keyword">this</span>);
scroller<span class="operator">-</span><span class="operator">></span>scrollTo(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span> WHEEL_SCROLL_OFFSET <span class="operator">+</span> index <span class="operator">*</span> itemHeight())<span class="operator">,</span> <span class="number">5000</span>);
}
<span class="comment">/*!
\class StringWheelWidget
\brief The StringWheelWidget class is an implementation of the AbstractWheelWidget class that draws QStrings as items.
\sa AbstractWheelWidget
*/</span>
StringWheelWidget<span class="operator">::</span>StringWheelWidget(bool touch)
: AbstractWheelWidget(touch)
{ }
<span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> StringWheelWidget<span class="operator">::</span>items() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_items;
}
<span class="type">void</span> StringWheelWidget<span class="operator">::</span>setItems( <span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> <span class="operator">&</span>items )
{
m_items <span class="operator">=</span> items;
<span class="keyword">if</span> (m_currentItem <span class="operator">></span><span class="operator">=</span> items<span class="operator">.</span>count())
m_currentItem <span class="operator">=</span> items<span class="operator">.</span>count()<span class="operator">-</span><span class="number">1</span>;
update();
}
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> StringWheelWidget<span class="operator">::</span>sizeHint() <span class="keyword">const</span>
{
<span class="comment">// determine font size</span>
<span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fm(font());
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>( fm<span class="operator">.</span>width(<span class="string">"m"</span>) <span class="operator">*</span> <span class="number">10</span> <span class="operator">+</span> <span class="number">6</span><span class="operator">,</span> fm<span class="operator">.</span>height() <span class="operator">*</span> <span class="number">7</span> <span class="operator">+</span> <span class="number">6</span> );
}
<span class="type"><a href="../qtcore/qsize.html">QSize</a></span> StringWheelWidget<span class="operator">::</span>minimumSizeHint() <span class="keyword">const</span>
{
<span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fm(font());
<span class="keyword">return</span> <span class="type"><a href="../qtcore/qsize.html">QSize</a></span>( fm<span class="operator">.</span>width(<span class="string">"m"</span>) <span class="operator">*</span> <span class="number">5</span> <span class="operator">+</span> <span class="number">6</span><span class="operator">,</span> fm<span class="operator">.</span>height() <span class="operator">*</span> <span class="number">3</span> <span class="operator">+</span> <span class="number">6</span> );
}
<span class="type">void</span> StringWheelWidget<span class="operator">::</span>paintItem(<span class="type"><a href="../qtgui/qpainter.html">QPainter</a></span><span class="operator">*</span> painter<span class="operator">,</span> <span class="type">int</span> index<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="../qtcore/qrect.html">QRect</a></span> <span class="operator">&</span>rect)
{
painter<span class="operator">-</span><span class="operator">></span>drawText(rect<span class="operator">,</span> <span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>AlignCenter<span class="operator">,</span> m_items<span class="operator">.</span>at(index));
}
<span class="type">int</span> StringWheelWidget<span class="operator">::</span>itemHeight() <span class="keyword">const</span>
{
<span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fm(font());
<span class="keyword">return</span> fm<span class="operator">.</span>height();
}
<span class="type">int</span> StringWheelWidget<span class="operator">::</span>itemCount() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_items<span class="operator">.</span>count();
}</pre>
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<!-- @@@webkitwidgets/scroller/wheel/wheelwidget.cpp -->
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