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qt4-x11/doc/html/tools-customcompleter-textedit-cpp.html
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<h1 class="title">textedit.cpp Example File</h1>
<span class="small-subtitle">tools/customcompleter/textedit.cpp</span>
<!-- $$$tools/customcompleter/textedit.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
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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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** 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;textedit.h&quot;</span>
<span class="preprocessor">#include &lt;QCompleter&gt;</span>
<span class="preprocessor">#include &lt;QKeyEvent&gt;</span>
<span class="preprocessor">#include &lt;QAbstractItemView&gt;</span>
<span class="preprocessor">#include &lt;QtDebug&gt;</span>
<span class="preprocessor">#include &lt;QApplication&gt;</span>
<span class="preprocessor">#include &lt;QModelIndex&gt;</span>
<span class="preprocessor">#include &lt;QAbstractItemModel&gt;</span>
<span class="preprocessor">#include &lt;QScrollBar&gt;</span>
TextEdit<span class="operator">::</span>TextEdit(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qtextedit.html">QTextEdit</a></span>(parent)<span class="operator">,</span> c(<span class="number">0</span>)
{
setPlainText(tr(<span class="string">&quot;This TextEdit provides autocompletions for words that have more than&quot;</span>
<span class="string">&quot; 3 characters. You can trigger autocompletion using &quot;</span>) <span class="operator">+</span>
<span class="type"><a href="qkeysequence.html">QKeySequence</a></span>(<span class="string">&quot;Ctrl+E&quot;</span>)<span class="operator">.</span>toString(<span class="type"><a href="qkeysequence.html">QKeySequence</a></span><span class="operator">::</span>NativeText));
}
TextEdit<span class="operator">::</span><span class="operator">~</span>TextEdit()
{
}
<span class="type">void</span> TextEdit<span class="operator">::</span>setCompleter(<span class="type"><a href="qcompleter.html">QCompleter</a></span> <span class="operator">*</span>completer)
{
<span class="keyword">if</span> (c)
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>disconnect(c<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="number">0</span>);
c <span class="operator">=</span> completer;
<span class="keyword">if</span> (<span class="operator">!</span>c)
<span class="keyword">return</span>;
c<span class="operator">-</span><span class="operator">&gt;</span>setWidget(<span class="keyword">this</span>);
c<span class="operator">-</span><span class="operator">&gt;</span>setCompletionMode(<span class="type"><a href="qcompleter.html">QCompleter</a></span><span class="operator">::</span>PopupCompletion);
c<span class="operator">-</span><span class="operator">&gt;</span>setCaseSensitivity(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>CaseInsensitive);
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(c<span class="operator">,</span> SIGNAL(activated(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(insertCompletion(<span class="type"><a href="qstring.html">QString</a></span>)));
}
<span class="type"><a href="qcompleter.html">QCompleter</a></span> <span class="operator">*</span>TextEdit<span class="operator">::</span>completer() <span class="keyword">const</span>
{
<span class="keyword">return</span> c;
}
<span class="type">void</span> TextEdit<span class="operator">::</span>insertCompletion(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">&amp;</span> completion)
{
<span class="keyword">if</span> (c<span class="operator">-</span><span class="operator">&gt;</span>widget() <span class="operator">!</span><span class="operator">=</span> <span class="keyword">this</span>)
<span class="keyword">return</span>;
<span class="type"><a href="qtextcursor.html">QTextCursor</a></span> tc <span class="operator">=</span> textCursor();
<span class="type">int</span> extra <span class="operator">=</span> completion<span class="operator">.</span>length() <span class="operator">-</span> c<span class="operator">-</span><span class="operator">&gt;</span>completionPrefix()<span class="operator">.</span>length();
tc<span class="operator">.</span>movePosition(<span class="type"><a href="qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>Left);
tc<span class="operator">.</span>movePosition(<span class="type"><a href="qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>EndOfWord);
tc<span class="operator">.</span>insertText(completion<span class="operator">.</span>right(extra));
setTextCursor(tc);
}
<span class="type"><a href="qstring.html">QString</a></span> TextEdit<span class="operator">::</span>textUnderCursor() <span class="keyword">const</span>
{
<span class="type"><a href="qtextcursor.html">QTextCursor</a></span> tc <span class="operator">=</span> textCursor();
tc<span class="operator">.</span>select(<span class="type"><a href="qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>WordUnderCursor);
<span class="keyword">return</span> tc<span class="operator">.</span>selectedText();
}
<span class="type">void</span> TextEdit<span class="operator">::</span>focusInEvent(<span class="type"><a href="qfocusevent.html">QFocusEvent</a></span> <span class="operator">*</span>e)
{
<span class="keyword">if</span> (c)
c<span class="operator">-</span><span class="operator">&gt;</span>setWidget(<span class="keyword">this</span>);
<span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>focusInEvent(e);
}
<span class="type">void</span> TextEdit<span class="operator">::</span>keyPressEvent(<span class="type"><a href="qkeyevent.html">QKeyEvent</a></span> <span class="operator">*</span>e)
{
<span class="keyword">if</span> (c <span class="operator">&amp;</span><span class="operator">&amp;</span> c<span class="operator">-</span><span class="operator">&gt;</span>popup()<span class="operator">-</span><span class="operator">&gt;</span>isVisible()) {
<span class="comment">// The following keys are forwarded by the completer to the widget</span>
<span class="keyword">switch</span> (e<span class="operator">-</span><span class="operator">&gt;</span>key()) {
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Enter:
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Return:
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Escape:
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Tab:
<span class="keyword">case</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_Backtab:
e<span class="operator">-</span><span class="operator">&gt;</span>ignore();
<span class="keyword">return</span>; <span class="comment">// let the completer do default behavior</span>
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
}
<span class="type">bool</span> isShortcut <span class="operator">=</span> ((e<span class="operator">-</span><span class="operator">&gt;</span>modifiers() <span class="operator">&amp;</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ControlModifier) <span class="operator">&amp;</span><span class="operator">&amp;</span> e<span class="operator">-</span><span class="operator">&gt;</span>key() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Key_E); <span class="comment">// CTRL+E</span>
<span class="keyword">if</span> (<span class="operator">!</span>c <span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>isShortcut) <span class="comment">// do not process the shortcut when we have a completer</span>
<span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">::</span>keyPressEvent(e);
<span class="keyword">const</span> <span class="type">bool</span> ctrlOrShift <span class="operator">=</span> e<span class="operator">-</span><span class="operator">&gt;</span>modifiers() <span class="operator">&amp;</span> (<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ControlModifier <span class="operator">|</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ShiftModifier);
<span class="keyword">if</span> (<span class="operator">!</span>c <span class="operator">|</span><span class="operator">|</span> (ctrlOrShift <span class="operator">&amp;</span><span class="operator">&amp;</span> e<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>isEmpty()))
<span class="keyword">return</span>;
<span class="keyword">static</span> <span class="type"><a href="qstring.html">QString</a></span> eow(<span class="string">&quot;~!@#$%^&amp;*()_+{}|:\&quot;&lt;&gt;?,./;'[]\\-=&quot;</span>); <span class="comment">// end of word</span>
<span class="type">bool</span> hasModifier <span class="operator">=</span> (e<span class="operator">-</span><span class="operator">&gt;</span>modifiers() <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>NoModifier) <span class="operator">&amp;</span><span class="operator">&amp;</span> <span class="operator">!</span>ctrlOrShift;
<span class="type"><a href="qstring.html">QString</a></span> completionPrefix <span class="operator">=</span> textUnderCursor();
<span class="keyword">if</span> (<span class="operator">!</span>isShortcut <span class="operator">&amp;</span><span class="operator">&amp;</span> (hasModifier <span class="operator">|</span><span class="operator">|</span> e<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>isEmpty()<span class="operator">|</span><span class="operator">|</span> completionPrefix<span class="operator">.</span>length() <span class="operator">&lt;</span> <span class="number">3</span>
<span class="operator">|</span><span class="operator">|</span> eow<span class="operator">.</span>contains(e<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>right(<span class="number">1</span>)))) {
c<span class="operator">-</span><span class="operator">&gt;</span>popup()<span class="operator">-</span><span class="operator">&gt;</span>hide();
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (completionPrefix <span class="operator">!</span><span class="operator">=</span> c<span class="operator">-</span><span class="operator">&gt;</span>completionPrefix()) {
c<span class="operator">-</span><span class="operator">&gt;</span>setCompletionPrefix(completionPrefix);
c<span class="operator">-</span><span class="operator">&gt;</span>popup()<span class="operator">-</span><span class="operator">&gt;</span>setCurrentIndex(c<span class="operator">-</span><span class="operator">&gt;</span>completionModel()<span class="operator">-</span><span class="operator">&gt;</span>index(<span class="number">0</span><span class="operator">,</span> <span class="number">0</span>));
}
<span class="type"><a href="qrect.html">QRect</a></span> cr <span class="operator">=</span> cursorRect();
cr<span class="operator">.</span>setWidth(c<span class="operator">-</span><span class="operator">&gt;</span>popup()<span class="operator">-</span><span class="operator">&gt;</span>sizeHintForColumn(<span class="number">0</span>)
<span class="operator">+</span> c<span class="operator">-</span><span class="operator">&gt;</span>popup()<span class="operator">-</span><span class="operator">&gt;</span>verticalScrollBar()<span class="operator">-</span><span class="operator">&gt;</span>sizeHint()<span class="operator">.</span>width());
c<span class="operator">-</span><span class="operator">&gt;</span>complete(cr); <span class="comment">// popup it up!</span>
}</pre>
</div>
<!-- @@@tools/customcompleter/textedit.cpp -->
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