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Breadcrumbs go here --> </ul> </div> <div class="toolbuttons toolblock"> <ul> <li id="smallA" class="t_button">A</li> <li id="medA" class="t_button active">A</li> <li id="bigA" class="t_button">A</li> <li id="print" class="t_button"><a href="javascript:this.print();"> <span>Print</span></a></li> </ul> </div> </div> <div class="content mainContent"> <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) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** 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 Digia Plc and its Subsidiary(-ies) 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 "flowlayout.h"</span> <span class="preprocessor">#include <QtGui/qwidget.h></span> <span class="preprocessor">#include <QtCore/qmath.h></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">></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">></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">&</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">&</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">&</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">&</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">&</span>left<span class="operator">,</span> <span class="operator">&</span>top<span class="operator">,</span> <span class="operator">&</span>right<span class="operator">,</span> <span class="operator">&</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"><</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">></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">></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">></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">&</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">&</span>left<span class="operator">,</span> <span class="operator">&</span>top<span class="operator">,</span> <span class="operator">&</span>right<span class="operator">,</span> <span class="operator">&</span>bottom); <span class="keyword">if</span> (constraint<span class="operator">.</span>width() <span class="operator">></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">></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">></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">&</span>left<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="operator">&</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">></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">></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">></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">></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">></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">&</span>left<span class="operator">,</span> <span class="operator">&</span>top<span class="operator">,</span> <span class="operator">&</span>right<span class="operator">,</span> <span class="operator">&</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">&</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 --> </div> </div> </div> <div class="ft"> <span></span> </div> </div> <div class="footer"> <p> <acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its subsidiaries. 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