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<h1 class="title">flowlayout.cpp Example File</h1>
<span class="small-subtitle">graphicsview/flowlayout/flowlayout.cpp</span>
<!-- $$$graphicsview/flowlayout/flowlayout.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:
**
** &quot;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
** &quot;AS IS&quot; 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.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &quot;flowlayout.h&quot;</span>
<span class="preprocessor">#include &lt;QtGui/qwidget.h&gt;</span>
<span class="preprocessor">#include &lt;QtCore/qmath.h&gt;</span>
FlowLayout<span class="operator">::</span>FlowLayout()
{
m_spacing<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">6</span>;
m_spacing<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> <span class="number">6</span>;
<span class="type"><a href="qsizepolicy.html">QSizePolicy</a></span> sp <span class="operator">=</span> sizePolicy();
sp<span class="operator">.</span>setHeightForWidth(<span class="keyword">true</span>);
setSizePolicy(sp);
}
<span class="type">void</span> FlowLayout<span class="operator">::</span>insertItem(<span class="type">int</span> index<span class="operator">,</span> <span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span> <span class="operator">*</span>item)
{
item<span class="operator">-</span><span class="operator">&gt;</span>setParentLayoutItem(<span class="keyword">this</span>);
<span class="keyword">if</span> (<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span>(index) <span class="operator">&gt;</span> <span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span>(m_items<span class="operator">.</span>count()))
index <span class="operator">=</span> m_items<span class="operator">.</span>count();
m_items<span class="operator">.</span>insert(index<span class="operator">,</span> item);
invalidate();
}
<span class="type">int</span> FlowLayout<span class="operator">::</span>count() <span class="keyword">const</span>
{
<span class="keyword">return</span> m_items<span class="operator">.</span>count();
}
<span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span> <span class="operator">*</span>FlowLayout<span class="operator">::</span>itemAt(<span class="type">int</span> index) <span class="keyword">const</span>
{
<span class="keyword">return</span> m_items<span class="operator">.</span>value(index);
}
<span class="type">void</span> FlowLayout<span class="operator">::</span>removeAt(<span class="type">int</span> index)
{
m_items<span class="operator">.</span>removeAt(index);
invalidate();
}
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> FlowLayout<span class="operator">::</span>spacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Orientation o) <span class="keyword">const</span>
{
<span class="keyword">return</span> m_spacing<span class="operator">[</span><span class="type">int</span>(o) <span class="operator">-</span> <span class="number">1</span><span class="operator">]</span>;
}
<span class="type">void</span> FlowLayout<span class="operator">::</span>setSpacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Orientations o<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> spacing)
{
<span class="keyword">if</span> (o <span class="operator">&amp;</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal)
m_spacing<span class="operator">[</span><span class="number">0</span><span class="operator">]</span> <span class="operator">=</span> spacing;
<span class="keyword">if</span> (o <span class="operator">&amp;</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Vertical)
m_spacing<span class="operator">[</span><span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> spacing;
}
<span class="type">void</span> FlowLayout<span class="operator">::</span>setGeometry(<span class="keyword">const</span> <span class="type"><a href="qrectf.html">QRectF</a></span> <span class="operator">&amp;</span>geom)
{
<span class="type"><a href="qgraphicslayout.html">QGraphicsLayout</a></span><span class="operator">::</span>setGeometry(geom);
doLayout(geom<span class="operator">,</span> <span class="keyword">true</span>);
}
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> FlowLayout<span class="operator">::</span>doLayout(<span class="keyword">const</span> <span class="type"><a href="qrectf.html">QRectF</a></span> <span class="operator">&amp;</span>geom<span class="operator">,</span> <span class="type">bool</span> applyNewGeometry) <span class="keyword">const</span>
{
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> left<span class="operator">,</span> top<span class="operator">,</span> right<span class="operator">,</span> bottom;
getContentsMargins(<span class="operator">&amp;</span>left<span class="operator">,</span> <span class="operator">&amp;</span>top<span class="operator">,</span> <span class="operator">&amp;</span>right<span class="operator">,</span> <span class="operator">&amp;</span>bottom);
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> maxw <span class="operator">=</span> geom<span class="operator">.</span>width() <span class="operator">-</span> left <span class="operator">-</span> right;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> x <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> y <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> maxRowHeight <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qsizef.html">QSizeF</a></span> pref;
<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> m_items<span class="operator">.</span>count(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> m_items<span class="operator">.</span>at(i);
pref <span class="operator">=</span> item<span class="operator">-</span><span class="operator">&gt;</span>effectiveSizeHint(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>PreferredSize);
maxRowHeight <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(maxRowHeight<span class="operator">,</span> pref<span class="operator">.</span>height());
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> next_x;
next_x <span class="operator">=</span> x <span class="operator">+</span> pref<span class="operator">.</span>width();
<span class="keyword">if</span> (next_x <span class="operator">&gt;</span> maxw) {
<span class="keyword">if</span> (x <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
pref<span class="operator">.</span>setWidth(maxw);
} <span class="keyword">else</span> {
x <span class="operator">=</span> <span class="number">0</span>;
next_x <span class="operator">=</span> pref<span class="operator">.</span>width();
}
y <span class="operator">+</span><span class="operator">=</span> maxRowHeight <span class="operator">+</span> spacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Vertical);
maxRowHeight <span class="operator">=</span> <span class="number">0</span>;
}
<span class="keyword">if</span> (applyNewGeometry)
item<span class="operator">-</span><span class="operator">&gt;</span>setGeometry(<span class="type"><a href="qrectf.html">QRectF</a></span>(<span class="type"><a href="qpointf.html">QPointF</a></span>(left <span class="operator">+</span> x<span class="operator">,</span> top <span class="operator">+</span> y)<span class="operator">,</span> pref));
x <span class="operator">=</span> next_x <span class="operator">+</span> spacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
}
maxRowHeight <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(maxRowHeight<span class="operator">,</span> pref<span class="operator">.</span>height());
<span class="keyword">return</span> top <span class="operator">+</span> y <span class="operator">+</span> maxRowHeight <span class="operator">+</span> bottom;
}
<span class="type"><a href="qsizef.html">QSizeF</a></span> FlowLayout<span class="operator">::</span>minSize(<span class="keyword">const</span> <span class="type"><a href="qsizef.html">QSizeF</a></span> <span class="operator">&amp;</span>constraint) <span class="keyword">const</span>
{
<span class="type"><a href="qsizef.html">QSizeF</a></span> size(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> left<span class="operator">,</span> top<span class="operator">,</span> right<span class="operator">,</span> bottom;
getContentsMargins(<span class="operator">&amp;</span>left<span class="operator">,</span> <span class="operator">&amp;</span>top<span class="operator">,</span> <span class="operator">&amp;</span>right<span class="operator">,</span> <span class="operator">&amp;</span>bottom);
<span class="keyword">if</span> (constraint<span class="operator">.</span>width() <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">0</span>) { <span class="comment">// height for width</span>
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> height <span class="operator">=</span> doLayout(<span class="type"><a href="qrectf.html">QRectF</a></span>(<span class="type"><a href="qpointf.html">QPointF</a></span>(<span class="number">0</span><span class="operator">,</span><span class="number">0</span>)<span class="operator">,</span> constraint)<span class="operator">,</span> <span class="keyword">false</span>);
size <span class="operator">=</span> <span class="type"><a href="qsizef.html">QSizeF</a></span>(constraint<span class="operator">.</span>width()<span class="operator">,</span> height);
} <span class="keyword">else</span> <span class="keyword">if</span> (constraint<span class="operator">.</span>height() <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">0</span>) { <span class="comment">// width for height?</span>
<span class="comment">// not supported</span>
} <span class="keyword">else</span> {
<span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span> <span class="operator">*</span>item;
foreach (item<span class="operator">,</span> m_items)
size <span class="operator">=</span> size<span class="operator">.</span>expandedTo(item<span class="operator">-</span><span class="operator">&gt;</span>effectiveSizeHint(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MinimumSize));
size <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qsize.html">QSize</a></span>(left <span class="operator">+</span> right<span class="operator">,</span> top <span class="operator">+</span> bottom);
}
<span class="keyword">return</span> size;
}
<span class="type"><a href="qsizef.html">QSizeF</a></span> FlowLayout<span class="operator">::</span>prefSize() <span class="keyword">const</span>
{
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> left<span class="operator">,</span> right;
getContentsMargins(<span class="operator">&amp;</span>left<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="operator">&amp;</span>right<span class="operator">,</span> <span class="number">0</span>);
<span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span> <span class="operator">*</span>item;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> maxh <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> totalWidth <span class="operator">=</span> <span class="number">0</span>;
foreach (item<span class="operator">,</span> m_items) {
<span class="keyword">if</span> (totalWidth <span class="operator">&gt;</span> <span class="number">0</span>)
totalWidth <span class="operator">+</span><span class="operator">=</span> spacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
<span class="type"><a href="qsizef.html">QSizeF</a></span> pref <span class="operator">=</span> item<span class="operator">-</span><span class="operator">&gt;</span>effectiveSizeHint(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>PreferredSize);
totalWidth <span class="operator">+</span><span class="operator">=</span> pref<span class="operator">.</span>width();
maxh <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(maxh<span class="operator">,</span> pref<span class="operator">.</span>height());
}
maxh <span class="operator">+</span><span class="operator">=</span> spacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Vertical);
<span class="keyword">const</span> <span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> goldenAspectRatio <span class="operator">=</span> <span class="number">1.61803399</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> w <span class="operator">=</span> <a href="qtcore-qmath-h.html#qSqrt">qSqrt</a>(totalWidth <span class="operator">*</span> maxh <span class="operator">*</span> goldenAspectRatio) <span class="operator">+</span> left <span class="operator">+</span> right;
<span class="keyword">return</span> minSize(<span class="type"><a href="qsizef.html">QSizeF</a></span>(w<span class="operator">,</span> <span class="operator">-</span><span class="number">1</span>));
}
<span class="type"><a href="qsizef.html">QSizeF</a></span> FlowLayout<span class="operator">::</span>maxSize() <span class="keyword">const</span>
{
<span class="type"><a href="qgraphicslayoutitem.html">QGraphicsLayoutItem</a></span> <span class="operator">*</span>item;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> totalWidth <span class="operator">=</span> <span class="number">0</span>;
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> totalHeight <span class="operator">=</span> <span class="number">0</span>;
foreach (item<span class="operator">,</span> m_items) {
<span class="keyword">if</span> (totalWidth <span class="operator">&gt;</span> <span class="number">0</span>)
totalWidth <span class="operator">+</span><span class="operator">=</span> spacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
<span class="keyword">if</span> (totalHeight <span class="operator">&gt;</span> <span class="number">0</span>)
totalHeight <span class="operator">+</span><span class="operator">=</span> spacing(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Vertical);
<span class="type"><a href="qsizef.html">QSizeF</a></span> pref <span class="operator">=</span> item<span class="operator">-</span><span class="operator">&gt;</span>effectiveSizeHint(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>PreferredSize);
totalWidth <span class="operator">+</span><span class="operator">=</span> pref<span class="operator">.</span>width();
totalHeight <span class="operator">+</span><span class="operator">=</span> pref<span class="operator">.</span>height();
}
<span class="type"><a href="qtglobal.html#qreal-typedef">qreal</a></span> left<span class="operator">,</span> top<span class="operator">,</span> right<span class="operator">,</span> bottom;
getContentsMargins(<span class="operator">&amp;</span>left<span class="operator">,</span> <span class="operator">&amp;</span>top<span class="operator">,</span> <span class="operator">&amp;</span>right<span class="operator">,</span> <span class="operator">&amp;</span>bottom);
<span class="keyword">return</span> <span class="type"><a href="qsizef.html">QSizeF</a></span>(left <span class="operator">+</span> totalWidth <span class="operator">+</span> right<span class="operator">,</span> top <span class="operator">+</span> totalHeight <span class="operator">+</span> bottom);
}
<span class="type"><a href="qsizef.html">QSizeF</a></span> FlowLayout<span class="operator">::</span>sizeHint(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>SizeHint which<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qsizef.html">QSizeF</a></span> <span class="operator">&amp;</span>constraint) <span class="keyword">const</span>
{
<span class="type"><a href="qsizef.html">QSizeF</a></span> sh <span class="operator">=</span> constraint;
<span class="keyword">switch</span> (which) {
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>PreferredSize:
sh <span class="operator">=</span> prefSize();
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MinimumSize:
sh <span class="operator">=</span> minSize(constraint);
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>MaximumSize:
sh <span class="operator">=</span> maxSize();
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
<span class="keyword">return</span> sh;
}</pre>
</div>
<!-- @@@graphicsview/flowlayout/flowlayout.cpp -->
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