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<h1 class="title">codeeditor.cpp Example File</h1>
<span class="small-subtitle">widgets/codeeditor/codeeditor.cpp</span>
<!-- $$$widgets/codeeditor/codeeditor.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 &lt;QtGui&gt;</span>
<span class="preprocessor">#include &quot;codeeditor.h&quot;</span>
CodeEditor<span class="operator">::</span>CodeEditor(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent) : <span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span>(parent)
{
lineNumberArea <span class="operator">=</span> <span class="keyword">new</span> LineNumberArea(<span class="keyword">this</span>);
connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(blockCountChanged(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateLineNumberAreaWidth(<span class="type">int</span>)));
connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(updateRequest(<span class="type"><a href="qrect.html">QRect</a></span><span class="operator">,</span><span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateLineNumberArea(<span class="type"><a href="qrect.html">QRect</a></span><span class="operator">,</span><span class="type">int</span>)));
connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(cursorPositionChanged())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(highlightCurrentLine()));
updateLineNumberAreaWidth(<span class="number">0</span>);
highlightCurrentLine();
}
<span class="type">int</span> CodeEditor<span class="operator">::</span>lineNumberAreaWidth()
{
<span class="type">int</span> digits <span class="operator">=</span> <span class="number">1</span>;
<span class="type">int</span> max <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">1</span><span class="operator">,</span> blockCount());
<span class="keyword">while</span> (max <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">10</span>) {
max <span class="operator">/</span><span class="operator">=</span> <span class="number">10</span>;
<span class="operator">+</span><span class="operator">+</span>digits;
}
<span class="type">int</span> space <span class="operator">=</span> <span class="number">3</span> <span class="operator">+</span> fontMetrics()<span class="operator">.</span>width(QLatin1Char(<span class="char">'9'</span>)) <span class="operator">*</span> digits;
<span class="keyword">return</span> space;
}
<span class="type">void</span> CodeEditor<span class="operator">::</span>updateLineNumberAreaWidth(<span class="type">int</span> <span class="comment">/* newBlockCount */</span>)
{
setViewportMargins(lineNumberAreaWidth()<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
}
<span class="type">void</span> CodeEditor<span class="operator">::</span>updateLineNumberArea(<span class="keyword">const</span> <span class="type"><a href="qrect.html">QRect</a></span> <span class="operator">&amp;</span>rect<span class="operator">,</span> <span class="type">int</span> dy)
{
<span class="keyword">if</span> (dy)
lineNumberArea<span class="operator">-</span><span class="operator">&gt;</span>scroll(<span class="number">0</span><span class="operator">,</span> dy);
<span class="keyword">else</span>
lineNumberArea<span class="operator">-</span><span class="operator">&gt;</span>update(<span class="number">0</span><span class="operator">,</span> rect<span class="operator">.</span>y()<span class="operator">,</span> lineNumberArea<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> rect<span class="operator">.</span>height());
<span class="keyword">if</span> (rect<span class="operator">.</span>contains(viewport()<span class="operator">-</span><span class="operator">&gt;</span>rect()))
updateLineNumberAreaWidth(<span class="number">0</span>);
}
<span class="type">void</span> CodeEditor<span class="operator">::</span>resizeEvent(<span class="type"><a href="qresizeevent.html">QResizeEvent</a></span> <span class="operator">*</span>e)
{
<span class="type"><a href="qplaintextedit.html">QPlainTextEdit</a></span><span class="operator">::</span>resizeEvent(e);
<span class="type"><a href="qrect.html">QRect</a></span> cr <span class="operator">=</span> contentsRect();
lineNumberArea<span class="operator">-</span><span class="operator">&gt;</span>setGeometry(<span class="type"><a href="qrect.html">QRect</a></span>(cr<span class="operator">.</span>left()<span class="operator">,</span> cr<span class="operator">.</span>top()<span class="operator">,</span> lineNumberAreaWidth()<span class="operator">,</span> cr<span class="operator">.</span>height()));
}
<span class="type">void</span> CodeEditor<span class="operator">::</span>highlightCurrentLine()
{
<span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>ExtraSelection<span class="operator">&gt;</span> extraSelections;
<span class="keyword">if</span> (<span class="operator">!</span>isReadOnly()) {
<span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>ExtraSelection selection;
<span class="type"><a href="qcolor.html">QColor</a></span> lineColor <span class="operator">=</span> <span class="type"><a href="qcolor.html">QColor</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>yellow)<span class="operator">.</span>lighter(<span class="number">160</span>);
selection<span class="operator">.</span>format<span class="operator">.</span>setBackground(lineColor);
selection<span class="operator">.</span>format<span class="operator">.</span>setProperty(<span class="type"><a href="qtextformat.html">QTextFormat</a></span><span class="operator">::</span>FullWidthSelection<span class="operator">,</span> <span class="keyword">true</span>);
selection<span class="operator">.</span>cursor <span class="operator">=</span> textCursor();
selection<span class="operator">.</span>cursor<span class="operator">.</span>clearSelection();
extraSelections<span class="operator">.</span>append(selection);
}
setExtraSelections(extraSelections);
}
<span class="type">void</span> CodeEditor<span class="operator">::</span>lineNumberAreaPaintEvent(<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> painter(lineNumberArea);
painter<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>lightGray);
<span class="type"><a href="qtextblock.html">QTextBlock</a></span> block <span class="operator">=</span> firstVisibleBlock();
<span class="type">int</span> blockNumber <span class="operator">=</span> block<span class="operator">.</span>blockNumber();
<span class="type">int</span> top <span class="operator">=</span> (<span class="type">int</span>) blockBoundingGeometry(block)<span class="operator">.</span>translated(contentOffset())<span class="operator">.</span>top();
<span class="type">int</span> bottom <span class="operator">=</span> top <span class="operator">+</span> (<span class="type">int</span>) blockBoundingRect(block)<span class="operator">.</span>height();
<span class="keyword">while</span> (block<span class="operator">.</span>isValid() <span class="operator">&amp;</span><span class="operator">&amp;</span> top <span class="operator">&lt;</span><span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>rect()<span class="operator">.</span>bottom()) {
<span class="keyword">if</span> (block<span class="operator">.</span>isVisible() <span class="operator">&amp;</span><span class="operator">&amp;</span> bottom <span class="operator">&gt;</span><span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>rect()<span class="operator">.</span>top()) {
<span class="type"><a href="qstring.html">QString</a></span> number <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(blockNumber <span class="operator">+</span> <span class="number">1</span>);
painter<span class="operator">.</span>setPen(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black);
painter<span class="operator">.</span>drawText(<span class="number">0</span><span class="operator">,</span> top<span class="operator">,</span> lineNumberArea<span class="operator">-</span><span class="operator">&gt;</span>width()<span class="operator">,</span> fontMetrics()<span class="operator">.</span>height()<span class="operator">,</span>
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignRight<span class="operator">,</span> number);
}
block <span class="operator">=</span> block<span class="operator">.</span>next();
top <span class="operator">=</span> bottom;
bottom <span class="operator">=</span> top <span class="operator">+</span> (<span class="type">int</span>) blockBoundingRect(block)<span class="operator">.</span>height();
<span class="operator">+</span><span class="operator">+</span>blockNumber;
}
}</pre>
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