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qt4-x11/doc/html/demos-embedded-flickable-main-cpp.html
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<h1 class="title">main.cpp Example File</h1>
<span class="small-subtitle">demos/embedded/flickable/main.cpp</span>
<!-- $$$demos/embedded/flickable/main.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 demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtCore&gt;</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &quot;flickable.h&quot;</span>
<span class="comment">// Returns a list of two-word color names</span>
<span class="keyword">static</span> <span class="type"><a href="qstringlist.html">QStringList</a></span> colorPairs(<span class="type">int</span> max)
{
<span class="comment">// capitalize the first letter</span>
<span class="type"><a href="qstringlist.html">QStringList</a></span> colors <span class="operator">=</span> <span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">::</span>colorNames();
colors<span class="operator">.</span>removeAll(<span class="string">&quot;transparent&quot;</span>);
<span class="type">int</span> num <span class="operator">=</span> colors<span class="operator">.</span>count();
<span class="keyword">for</span> (<span class="type">int</span> c <span class="operator">=</span> <span class="number">0</span>; c <span class="operator">&lt;</span> num; <span class="operator">+</span><span class="operator">+</span>c)
colors<span class="operator">[</span>c<span class="operator">]</span> <span class="operator">=</span> colors<span class="operator">[</span>c<span class="operator">]</span><span class="operator">[</span><span class="number">0</span><span class="operator">]</span><span class="operator">.</span>toUpper() <span class="operator">+</span> colors<span class="operator">[</span>c<span class="operator">]</span><span class="operator">.</span>mid(<span class="number">1</span>);
<span class="comment">// combine two colors, e.g. &quot;lime skyblue&quot;</span>
<span class="type"><a href="qstringlist.html">QStringList</a></span> combinedColors;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> num; <span class="operator">+</span><span class="operator">+</span>i)
<span class="keyword">for</span> (<span class="type">int</span> j <span class="operator">=</span> <span class="number">0</span>; j <span class="operator">&lt;</span> num; <span class="operator">+</span><span class="operator">+</span>j)
combinedColors <span class="operator">&lt;</span><span class="operator">&lt;</span> <span class="type"><a href="qstring.html">QString</a></span>(<span class="string">&quot;%1 %2&quot;</span>)<span class="operator">.</span>arg(colors<span class="operator">[</span>i<span class="operator">]</span>)<span class="operator">.</span>arg(colors<span class="operator">[</span>j<span class="operator">]</span>);
<span class="comment">// randomize it</span>
colors<span class="operator">.</span>clear();
<span class="keyword">while</span> (combinedColors<span class="operator">.</span>count()) {
<span class="type">int</span> i <span class="operator">=</span> qrand() <span class="operator">%</span> combinedColors<span class="operator">.</span>count();
colors <span class="operator">&lt;</span><span class="operator">&lt;</span> combinedColors<span class="operator">[</span>i<span class="operator">]</span>;
combinedColors<span class="operator">.</span>removeAt(i);
<span class="keyword">if</span> (colors<span class="operator">.</span>count() <span class="operator">=</span><span class="operator">=</span> max)
<span class="keyword">break</span>;
}
<span class="keyword">return</span> colors;
}
<span class="keyword">class</span> ColorList : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">,</span> <span class="keyword">public</span> Flickable
{
Q_OBJECT
<span class="keyword">public</span>:
ColorList(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent) {
m_offset <span class="operator">=</span> <span class="number">0</span>;
m_height <span class="operator">=</span> <span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span>(font())<span class="operator">.</span>height() <span class="operator">+</span> <span class="number">5</span>;
m_highlight <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
m_selected <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
<span class="type"><a href="qstringlist.html">QStringList</a></span> colors <span class="operator">=</span> colorPairs(<span class="number">999</span>);
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> colors<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="qstring.html">QString</a></span> c <span class="operator">=</span> colors<span class="operator">[</span>i<span class="operator">]</span>;
<span class="type"><a href="qstring.html">QString</a></span> str;
str<span class="operator">.</span>sprintf(<span class="string">&quot;%4d&quot;</span><span class="operator">,</span> i <span class="operator">+</span> <span class="number">1</span>);
m_colorNames <span class="operator">&lt;</span><span class="operator">&lt;</span> (str <span class="operator">+</span> <span class="string">&quot; &quot;</span> <span class="operator">+</span> c);
<span class="type"><a href="qstringlist.html">QStringList</a></span> duet <span class="operator">=</span> c<span class="operator">.</span>split(<span class="char">' '</span>);
m_firstColor <span class="operator">&lt;</span><span class="operator">&lt;</span> duet<span class="operator">[</span><span class="number">0</span><span class="operator">]</span>;
m_secondColor <span class="operator">&lt;</span><span class="operator">&lt;</span> duet<span class="operator">[</span><span class="number">1</span><span class="operator">]</span>;
}
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_OpaquePaintEvent<span class="operator">,</span> <span class="keyword">true</span>);
setAttribute(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>WA_NoSystemBackground<span class="operator">,</span> <span class="keyword">true</span>);
setMouseTracking(<span class="keyword">true</span>);
Flickable<span class="operator">::</span>setAcceptMouseClick(<span class="keyword">this</span>);
}
<span class="keyword">protected</span>:
<span class="comment">// reimplement from Flickable</span>
<span class="keyword">virtual</span> <span class="type"><a href="qpoint.html">QPoint</a></span> scrollOffset() <span class="keyword">const</span> {
<span class="keyword">return</span> <span class="type"><a href="qpoint.html">QPoint</a></span>(<span class="number">0</span><span class="operator">,</span> m_offset);
}
<span class="comment">// reimplement from Flickable</span>
<span class="keyword">virtual</span> <span class="type">void</span> setScrollOffset(<span class="keyword">const</span> <span class="type"><a href="qpoint.html">QPoint</a></span> <span class="operator">&amp;</span>offset) {
<span class="type">int</span> yy <span class="operator">=</span> offset<span class="operator">.</span>y();
<span class="keyword">if</span> (yy <span class="operator">!</span><span class="operator">=</span> m_offset) {
m_offset <span class="operator">=</span> <a href="qtglobal.html#qBound">qBound</a>(<span class="number">0</span><span class="operator">,</span> yy<span class="operator">,</span> m_height <span class="operator">*</span> m_colorNames<span class="operator">.</span>count() <span class="operator">-</span> height());
update();
}
}
<span class="keyword">protected</span>:
<span class="type">void</span> paintEvent(<span class="type"><a href="qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event) {
<span class="type"><a href="qpainter.html">QPainter</a></span> p(<span class="keyword">this</span>);
p<span class="operator">.</span>fillRect(event<span class="operator">-</span><span class="operator">&gt;</span>rect()<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
<span class="type">int</span> start <span class="operator">=</span> m_offset <span class="operator">/</span> m_height;
<span class="type">int</span> y <span class="operator">=</span> start <span class="operator">*</span> m_height <span class="operator">-</span> m_offset;
<span class="keyword">if</span> (m_offset <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span>) {
start <span class="operator">=</span> <span class="number">0</span>;
y <span class="operator">=</span> <span class="operator">-</span>m_offset;
}
<span class="type">int</span> end <span class="operator">=</span> start <span class="operator">+</span> height() <span class="operator">/</span> m_height <span class="operator">+</span> <span class="number">1</span>;
<span class="keyword">if</span> (end <span class="operator">&gt;</span> m_colorNames<span class="operator">.</span>count() <span class="operator">-</span> <span class="number">1</span>)
end <span class="operator">=</span> m_colorNames<span class="operator">.</span>count() <span class="operator">-</span> <span class="number">1</span>;
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> start; i <span class="operator">&lt;</span><span class="operator">=</span> end; <span class="operator">+</span><span class="operator">+</span>i<span class="operator">,</span> y <span class="operator">+</span><span class="operator">=</span> m_height) {
p<span class="operator">.</span>setBrush(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoBrush);
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
<span class="keyword">if</span> (i <span class="operator">=</span><span class="operator">=</span> m_highlight) {
p<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> y<span class="operator">,</span> width()<span class="operator">,</span> m_height<span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">64</span><span class="operator">,</span> <span class="number">128</span>));
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
}
<span class="keyword">if</span> (i <span class="operator">=</span><span class="operator">=</span> m_selected) {
p<span class="operator">.</span>fillRect(<span class="number">0</span><span class="operator">,</span> y<span class="operator">,</span> width()<span class="operator">,</span> m_height<span class="operator">,</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="number">0</span><span class="operator">,</span> <span class="number">128</span><span class="operator">,</span> <span class="number">240</span>));
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white);
}
p<span class="operator">.</span>drawText(m_height <span class="operator">+</span> <span class="number">2</span><span class="operator">,</span> y<span class="operator">,</span> width()<span class="operator">,</span> m_height<span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignVCenter<span class="operator">,</span> m_colorNames<span class="operator">[</span>i<span class="operator">]</span>);
p<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoPen);
p<span class="operator">.</span>setBrush(m_firstColor<span class="operator">[</span>i<span class="operator">]</span>);
p<span class="operator">.</span>drawRect(<span class="number">1</span><span class="operator">,</span> y <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> m_height <span class="operator">-</span> <span class="number">2</span><span class="operator">,</span> m_height <span class="operator">-</span> <span class="number">2</span>);
p<span class="operator">.</span>setBrush(m_secondColor<span class="operator">[</span>i<span class="operator">]</span>);
p<span class="operator">.</span>drawRect(<span class="number">5</span><span class="operator">,</span> y <span class="operator">+</span> <span class="number">5</span><span class="operator">,</span> m_height <span class="operator">-</span> <span class="number">11</span><span class="operator">,</span> m_height <span class="operator">-</span> <span class="number">11</span>);
}
p<span class="operator">.</span>end();
}
<span class="type">void</span> keyReleaseEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>event) {
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Down) {
m_offset <span class="operator">+</span><span class="operator">=</span> <span class="number">20</span>;
event<span class="operator">-</span><span class="operator">&gt;</span>accept();
update();
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Up) {
m_offset <span class="operator">-</span><span class="operator">=</span> <span class="number">20</span>;
event<span class="operator">-</span><span class="operator">&gt;</span>accept();
update();
<span class="keyword">return</span>;
}
}
<span class="type">void</span> mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) {
Flickable<span class="operator">::</span>handleMousePress(event);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>isAccepted())
<span class="keyword">return</span>;
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>button() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton) {
<span class="type">int</span> y <span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>pos()<span class="operator">.</span>y() <span class="operator">+</span> m_offset;
<span class="type">int</span> i <span class="operator">=</span> y <span class="operator">/</span> m_height;
<span class="keyword">if</span> (i <span class="operator">!</span><span class="operator">=</span> m_highlight) {
m_highlight <span class="operator">=</span> i;
m_selected <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
update();
}
event<span class="operator">-</span><span class="operator">&gt;</span>accept();
}
}
<span class="type">void</span> mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) {
Flickable<span class="operator">::</span>handleMouseMove(event);
}
<span class="type">void</span> mouseReleaseEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event) {
Flickable<span class="operator">::</span>handleMouseRelease(event);
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>isAccepted())
<span class="keyword">return</span>;
<span class="keyword">if</span> (event<span class="operator">-</span><span class="operator">&gt;</span>button() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>LeftButton) {
m_selected <span class="operator">=</span> m_highlight;
event<span class="operator">-</span><span class="operator">&gt;</span>accept();
update();
}
}
<span class="keyword">private</span>:
<span class="type">int</span> m_offset;
<span class="type">int</span> m_height;
<span class="type">int</span> m_highlight;
<span class="type">int</span> m_selected;
<span class="type"><a href="qstringlist.html">QStringList</a></span> m_colorNames;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">&gt;</span> m_firstColor;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qcolor.html">QColor</a></span><span class="operator">&gt;</span> m_secondColor;
};
<span class="preprocessor">#include &quot;main.moc&quot;</span>
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
{
<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
ColorList list;
list<span class="operator">.</span>setWindowTitle(<span class="string">&quot;Kinetic Scrolling&quot;</span>);
<span class="preprocessor">#if defined(Q_OS_SYMBIAN) || defined(Q_OS_WINCE_WM)</span>
list<span class="operator">.</span>showMaximized();
<span class="preprocessor">#else</span>
list<span class="operator">.</span>resize(<span class="number">320</span><span class="operator">,</span> <span class="number">320</span>);
list<span class="operator">.</span>show();
<span class="preprocessor">#endif</span>
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}</pre>
</div>
<!-- @@@demos/embedded/flickable/main.cpp -->
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