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<h1 class="title">characterwidget.cpp Example File</h1>
<span class="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) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the examples of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** 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 https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, 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
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  **   * Neither the name of The Qt Company Ltd nor the names of its
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  **     from this software without specific prior written permission.
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  **
  ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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  ** 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,
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  ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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  ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="preprocessor">#include &lt;QtWidgets&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)<span class="operator">,</span> columns(<span class="number">16</span>)<span class="operator">,</span> lastKey(<span class="operator">-</span><span class="number">1</span>)
  {
      calculateSquareSize();
      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="../qtgui/qfont.html">QFont</a></span> <span class="operator">&amp;</span>font)
  {
      displayFont<span class="operator">.</span>setFamily(font<span class="operator">.</span>family());
      calculateSquareSize();
      adjustSize();
      update();
  }

  <span class="type">void</span> CharacterWidget<span class="operator">::</span>updateSize(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>fontSize)
  {
      displayFont<span class="operator">.</span>setPointSize(fontSize<span class="operator">.</span>toInt());
      calculateSquareSize();
      adjustSize();
      update();
  }

  <span class="type">void</span> CharacterWidget<span class="operator">::</span>updateStyle(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&amp;</span>fontStyle)
  {
      <span class="type"><a href="../qtgui/qfontdatabase.html">QFontDatabase</a></span> fontDatabase;
      <span class="keyword">const</span> <span class="type"><a href="../qtgui/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);
      calculateSquareSize();
      adjustSize();
      update();
  }

  <span class="type">void</span> CharacterWidget<span class="operator">::</span>updateFontMerging(bool enable)
  {
      <span class="keyword">if</span> (enable)
          displayFont<span class="operator">.</span>setStyleStrategy(<span class="type"><a href="../qtgui/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="../qtgui/qfont.html">QFont</a></span><span class="operator">::</span>NoFontMerging);
      adjustSize();
      update();
  }

  <span class="type">void</span> CharacterWidget<span class="operator">::</span>calculateSquareSize()
  {
      squareSize <span class="operator">=</span> <a href="../qtcore/qtglobal.html#qMax">qMax</a>(<span class="number">16</span><span class="operator">,</span> <span class="number">4</span> <span class="operator">+</span> <span class="type"><a href="../qtgui/qfontmetrics.html">QFontMetrics</a></span>(displayFont<span class="operator">,</span> <span class="keyword">this</span>)<span class="operator">.</span>height());
  }

  <span class="type"><a href="../qtcore/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="../qtcore/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="../qtgui/qmouseevent.html">QMouseEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="../qtcore/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="../qtcore/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="../qtcore/qstring.html">QString</a></span> text <span class="operator">=</span> <span class="type"><a href="../qtcore/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="../qtcore/qchar.html">QChar</a></span>(key)
                    <span class="operator">+</span> <span class="type"><a href="../qtcore/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="../qtcore/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="../qtgui/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="../qtcore/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="../qtcore/qchar.html">QChar</a></span>(lastKey)<span class="operator">.</span>category() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qchar.html">QChar</a></span><span class="operator">::</span>Other_NotAssigned)
              <span class="keyword">emit</span> characterSelected(<span class="type"><a href="../qtcore/qstring.html">QString</a></span>(<span class="type"><a href="../qtcore/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="../qtgui/qpaintevent.html">QPaintEvent</a></span> <span class="operator">*</span>event)
  {
      <span class="type"><a href="../qtgui/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="../qtgui/qbrush.html">QBrush</a></span>(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>white));
      painter<span class="operator">.</span>setFont(displayFont);

      <span class="type"><a href="../qtcore/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="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/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="../qtgui/qfontmetrics.html">QFontMetrics</a></span> fontMetrics(displayFont);
      painter<span class="operator">.</span>setPen(<span class="type"><a href="../qtgui/qpen.html">QPen</a></span>(<span class="type"><a href="../qtcore/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="../qtgui/qbrush.html">QBrush</a></span>(<span class="type"><a href="../qtcore/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="../qtcore/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="../qtcore/qstring.html">QString</a></span>(<span class="type"><a href="../qtcore/qchar.html">QChar</a></span>(key)));
          }
      }
  }

</pre>
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<!-- @@@widgets/charactermap/characterwidget.cpp -->
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