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<h1 class="title">characterwidget.cpp Example File</h1>
<span class="small-subtitle">widgets/charactermap/characterwidget.cpp</span>
<!-- $$$widgets/charactermap/characterwidget.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;characterwidget.h&quot;</span>
CharacterWidget<span class="operator">::</span>CharacterWidget(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
{
squareSize <span class="operator">=</span> <span class="number">24</span>;
columns <span class="operator">=</span> <span class="number">16</span>;
lastKey <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
setMouseTracking(<span class="keyword">true</span>);
}
<span class="type">void</span> CharacterWidget<span class="operator">::</span>updateFont(<span class="keyword">const</span> <span class="type"><a href="qfont.html">QFont</a></span> <span class="operator">&amp;</span>font)
{
displayFont<span class="operator">.</span>setFamily(font<span class="operator">.</span>family());
squareSize <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">24</span><span class="operator">,</span> <span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span>(displayFont)<span class="operator">.</span>xHeight() <span class="operator">*</span> <span class="number">3</span>);
adjustSize();
update();
}
<span class="type">void</span> CharacterWidget<span class="operator">::</span>updateSize(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>fontSize)
{
displayFont<span class="operator">.</span>setPointSize(fontSize<span class="operator">.</span>toInt());
squareSize <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">24</span><span class="operator">,</span> <span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span>(displayFont)<span class="operator">.</span>xHeight() <span class="operator">*</span> <span class="number">3</span>);
adjustSize();
update();
}
<span class="type">void</span> CharacterWidget<span class="operator">::</span>updateStyle(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>fontStyle)
{
<span class="type"><a href="qfontdatabase.html">QFontDatabase</a></span> fontDatabase;
<span class="keyword">const</span> <span class="type"><a href="qfont.html">QFont</a></span><span class="operator">::</span>StyleStrategy oldStrategy <span class="operator">=</span> displayFont<span class="operator">.</span>styleStrategy();
displayFont <span class="operator">=</span> fontDatabase<span class="operator">.</span>font(displayFont<span class="operator">.</span>family()<span class="operator">,</span> fontStyle<span class="operator">,</span> displayFont<span class="operator">.</span>pointSize());
displayFont<span class="operator">.</span>setStyleStrategy(oldStrategy);
squareSize <span class="operator">=</span> <a href="qtglobal.html#qMax">qMax</a>(<span class="number">24</span><span class="operator">,</span> <span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span>(displayFont)<span class="operator">.</span>xHeight() <span class="operator">*</span> <span class="number">3</span>);
adjustSize();
update();
}
<span class="type">void</span> CharacterWidget<span class="operator">::</span>updateFontMerging(<span class="type">bool</span> enable)
{
<span class="keyword">if</span> (enable)
displayFont<span class="operator">.</span>setStyleStrategy(<span class="type"><a href="qfont.html">QFont</a></span><span class="operator">::</span>PreferDefault);
<span class="keyword">else</span>
displayFont<span class="operator">.</span>setStyleStrategy(<span class="type"><a href="qfont.html">QFont</a></span><span class="operator">::</span>NoFontMerging);
adjustSize();
update();
}
<span class="type"><a href="qsize.html">QSize</a></span> CharacterWidget<span class="operator">::</span>sizeHint() <span class="keyword">const</span>
{
<span class="keyword">return</span> <span class="type"><a href="qsize.html">QSize</a></span>(columns<span class="operator">*</span>squareSize<span class="operator">,</span> (<span class="number">65536</span><span class="operator">/</span>columns)<span class="operator">*</span>squareSize);
}
<span class="type">void</span> CharacterWidget<span class="operator">::</span>mouseMoveEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<span class="type"><a href="qpoint.html">QPoint</a></span> widgetPosition <span class="operator">=</span> mapFromGlobal(event<span class="operator">-</span><span class="operator">&gt;</span>globalPos());
<span class="type"><a href="qtglobal.html#uint-typedef">uint</a></span> key <span class="operator">=</span> (widgetPosition<span class="operator">.</span>y()<span class="operator">/</span>squareSize)<span class="operator">*</span>columns <span class="operator">+</span> widgetPosition<span class="operator">.</span>x()<span class="operator">/</span>squareSize;
<span class="type"><a href="qstring.html">QString</a></span> text <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">&quot;&lt;p&gt;Character: &lt;span style=\&quot;font-size: 24pt; font-family: %1\&quot;&gt;&quot;</span>)<span class="operator">.</span>arg(displayFont<span class="operator">.</span>family())
<span class="operator">+</span> <span class="type"><a href="qchar.html">QChar</a></span>(key)
<span class="operator">+</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">&quot;&lt;/span&gt;&lt;p&gt;Value: 0x&quot;</span>)
<span class="operator">+</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(key<span class="operator">,</span> <span class="number">16</span>);
<span class="type"><a href="qtooltip.html">QToolTip</a></span><span class="operator">::</span>showText(event<span class="operator">-</span><span class="operator">&gt;</span>globalPos()<span class="operator">,</span> text<span class="operator">,</span> <span class="keyword">this</span>);
}
<span class="type">void</span> CharacterWidget<span class="operator">::</span>mousePressEvent(<span class="type"><a href="qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
{
<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) {
lastKey <span class="operator">=</span> (event<span class="operator">-</span><span class="operator">&gt;</span>y()<span class="operator">/</span>squareSize)<span class="operator">*</span>columns <span class="operator">+</span> event<span class="operator">-</span><span class="operator">&gt;</span>x()<span class="operator">/</span>squareSize;
<span class="keyword">if</span> (<span class="type"><a href="qchar.html">QChar</a></span>(lastKey)<span class="operator">.</span>category() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qchar.html">QChar</a></span><span class="operator">::</span>NoCategory)
<span class="keyword">emit</span> characterSelected(<span class="type"><a href="qstring.html">QString</a></span>(<span class="type"><a href="qchar.html">QChar</a></span>(lastKey)));
update();
}
<span class="keyword">else</span>
<span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">::</span>mousePressEvent(event);
}
<span class="type">void</span> CharacterWidget<span class="operator">::</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> painter(<span class="keyword">this</span>);
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="qbrush.html">QBrush</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>white));
painter<span class="operator">.</span>setFont(displayFont);
<span class="type"><a href="qrect.html">QRect</a></span> redrawRect <span class="operator">=</span> event<span class="operator">-</span><span class="operator">&gt;</span>rect();
<span class="type">int</span> beginRow <span class="operator">=</span> redrawRect<span class="operator">.</span>top()<span class="operator">/</span>squareSize;
<span class="type">int</span> endRow <span class="operator">=</span> redrawRect<span class="operator">.</span>bottom()<span class="operator">/</span>squareSize;
<span class="type">int</span> beginColumn <span class="operator">=</span> redrawRect<span class="operator">.</span>left()<span class="operator">/</span>squareSize;
<span class="type">int</span> endColumn <span class="operator">=</span> redrawRect<span class="operator">.</span>right()<span class="operator">/</span>squareSize;
painter<span class="operator">.</span>setPen(<span class="type"><a href="qpen.html">QPen</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>gray));
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> beginRow; row <span class="operator">&lt;</span><span class="operator">=</span> endRow; <span class="operator">+</span><span class="operator">+</span>row) {
<span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> beginColumn; column <span class="operator">&lt;</span><span class="operator">=</span> endColumn; <span class="operator">+</span><span class="operator">+</span>column) {
painter<span class="operator">.</span>drawRect(column<span class="operator">*</span>squareSize<span class="operator">,</span> row<span class="operator">*</span>squareSize<span class="operator">,</span> squareSize<span class="operator">,</span> squareSize);
}
}
<span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span> fontMetrics(displayFont);
painter<span class="operator">.</span>setPen(<span class="type"><a href="qpen.html">QPen</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>black));
<span class="keyword">for</span> (<span class="type">int</span> row <span class="operator">=</span> beginRow; row <span class="operator">&lt;</span><span class="operator">=</span> endRow; <span class="operator">+</span><span class="operator">+</span>row) {
<span class="keyword">for</span> (<span class="type">int</span> column <span class="operator">=</span> beginColumn; column <span class="operator">&lt;</span><span class="operator">=</span> endColumn; <span class="operator">+</span><span class="operator">+</span>column) {
<span class="type">int</span> key <span class="operator">=</span> row<span class="operator">*</span>columns <span class="operator">+</span> column;
painter<span class="operator">.</span>setClipRect(column<span class="operator">*</span>squareSize<span class="operator">,</span> row<span class="operator">*</span>squareSize<span class="operator">,</span> squareSize<span class="operator">,</span> squareSize);
<span class="keyword">if</span> (key <span class="operator">=</span><span class="operator">=</span> lastKey)
painter<span class="operator">.</span>fillRect(column<span class="operator">*</span>squareSize <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> row<span class="operator">*</span>squareSize <span class="operator">+</span> <span class="number">1</span><span class="operator">,</span> squareSize<span class="operator">,</span> squareSize<span class="operator">,</span> <span class="type"><a href="qbrush.html">QBrush</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red));
painter<span class="operator">.</span>drawText(column<span class="operator">*</span>squareSize <span class="operator">+</span> (squareSize <span class="operator">/</span> <span class="number">2</span>) <span class="operator">-</span> fontMetrics<span class="operator">.</span>width(<span class="type"><a href="qchar.html">QChar</a></span>(key))<span class="operator">/</span><span class="number">2</span><span class="operator">,</span>
row<span class="operator">*</span>squareSize <span class="operator">+</span> <span class="number">4</span> <span class="operator">+</span> fontMetrics<span class="operator">.</span>ascent()<span class="operator">,</span>
<span class="type"><a href="qstring.html">QString</a></span>(<span class="type"><a href="qchar.html">QChar</a></span>(key)));
}
}
}</pre>
</div>
<!-- @@@widgets/charactermap/characterwidget.cpp -->
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