379 lines
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379 lines
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<li class="level1"><a href="#setting-up-the-resource-file">Setting Up The Resource File</a></li>
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<li class="level1"><a href="#textfinder-class-definition">TextFinder Class Definition</a></li>
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<li class="level1"><a href="#textfinder-class-implementation">TextFinder Class Implementation</a></li>
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<li class="level1"><a href="#function"><tt>main()</tt> Function</a></li>
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<h1 class="title">Text Finder Example</h1>
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<span class="subtitle"></span>
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<!-- $$$uitools/textfinder-description -->
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<div class="descr"> <a name="details"></a>
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<p>Files:</p>
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<ul>
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<li><a href="uitools-textfinder-textfinder-cpp.html">uitools/textfinder/textfinder.cpp</a></li>
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<li><a href="uitools-textfinder-textfinder-h.html">uitools/textfinder/textfinder.h</a></li>
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<li><a href="uitools-textfinder-forms-textfinder-ui.html">uitools/textfinder/forms/textfinder.ui</a></li>
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<li><a href="uitools-textfinder-main-cpp.html">uitools/textfinder/main.cpp</a></li>
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<li><a href="uitools-textfinder-textfinder-pro.html">uitools/textfinder/textfinder.pro</a></li>
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<li><a href="uitools-textfinder-textfinder-qrc.html">uitools/textfinder/textfinder.qrc</a></li>
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</ul>
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<p>The Text Finder example demonstrates how to dynamically process forms using the <a href="qtuitools.html">QtUiTools</a> module.<p>Dynamic form processing enables a form to be processed at run-time only by changing the UI file for the project. The program allows the user to look up a particular word within the contents of a text file. This text file is included in the project's resource and is loaded into the display at startup.</p>
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<table class="generic">
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<tr valign="top" class="odd"><td ><img src="images/textfinder-example-find.png" alt="" /></td><td ><img src="images/textfinder-example-find2.png" alt="" /></td></tr>
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</table>
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<a name="setting-up-the-resource-file"></a>
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<h2>Setting Up The Resource File</h2>
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<p>The resources required for Text Finder are:</p>
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<ul>
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<li><i>textfinder.ui</i> - the user interface file created in <a href="qtdesigner.html">QtDesigner</a></li>
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<li><i>input.txt</i> - a text file containing some text to be displayed in the <a href="qtextedit.html">QTextEdit</a></li>
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</ul>
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<p><i>textfinder.ui</i> contains all the necessary <a href="qwidget.html">QWidget</a> objects for the Text Finder. A <a href="qlineedit.html">QLineEdit</a> is used for the user input, a <a href="qtextedit.html">QTextEdit</a> is used to display the contents of <i>input.txt</i>, a <a href="qlabel.html">QLabel</a> is used to display the text "Keyword", and a <a href="qpushbutton.html">QPushButton</a> is used for the "Find" button. The screenshot below shows the preview obtained in <a href="qtdesigner.html">QtDesigner</a>.</p>
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<p class="centerAlign"><img src="images/textfinder-example-userinterface.png" alt="" /></p><p>A <i>textfinder.qrc</i> file is used to store both the <i>textfinder.ui</i> and <i>input.txt</i> in the application's executable. The file contains the following code:</p>
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<pre class="cpp"> <!DOCTYPE RCC><RCC version="1.0">
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<qresource>
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<file>forms/textfinder.ui</file>
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<file>forms/input.txt</file>
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</qresource>
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</RCC></pre>
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<p>For more information on resource files, see <a href="resources.html">The Qt Resource System</a>.</p>
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<p>To generate a form at run-time, the example is linked against the <a href="qtuitools.html">QtUiTools</a> module library. This is done in the <tt>textfinder.pro</tt> file that contains the following lines:</p>
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<pre class="cpp"> CONFIG += uitools
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HEADERS = textfinder.h
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RESOURCES = textfinder.qrc
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SOURCES = textfinder.cpp main.cpp</pre>
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<a name="textfinder-class-definition"></a>
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<h2>TextFinder Class Definition</h2>
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<p>The <tt>TextFinder</tt> class is a subclass of <a href="qwidget.html">QWidget</a> and it hosts the <a href="qwidget.html">QWidget</a>s we need to access in the user interface. The <a href="qlabel.html">QLabel</a> in the user interface is not declared here as we do not need to access it.</p>
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<pre class="cpp"> <span class="keyword">class</span> TextFinder : <span class="keyword">public</span> <span class="type"><a href="qwidget.html">QWidget</a></span>
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{
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Q_OBJECT
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<span class="keyword">public</span>:
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TextFinder(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);
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<span class="keyword">private</span> <span class="keyword">slots</span>:
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<span class="type">void</span> on_findButton_clicked();
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<span class="keyword">private</span>:
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<span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span> loadUiFile();
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<span class="type">void</span> loadTextFile();
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<span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>ui_findButton;
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<span class="type"><a href="qtextedit.html">QTextEdit</a></span> <span class="operator">*</span>ui_textEdit;
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<span class="type"><a href="qlineedit.html">QLineEdit</a></span> <span class="operator">*</span>ui_lineEdit;
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<span class="type">bool</span> isFirstTime;
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};</pre>
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<p>The slot <tt>on_findButton_clicked()</tt> is a slot named according to the <a href="designer-using-a-ui-file.html#automatic-connections">Automatic Connection</a> naming convention required by <tt>uic</tt>.</p>
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<a name="textfinder-class-implementation"></a>
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<h2>TextFinder Class Implementation</h2>
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<p>The <tt>TextFinder</tt> class's constructor calls the <tt>loadUiFile()</tt> function and then uses <tt>qFindChild()</tt> to access the user interface's <a href="qwidget.html">QWidget</a>s.</p>
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<pre class="cpp"> TextFinder<span class="operator">::</span>TextFinder(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
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: <span class="type"><a href="qwidget.html">QWidget</a></span>(parent)
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{
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<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>formWidget <span class="operator">=</span> loadUiFile();
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ui_findButton <span class="operator">=</span> findChild<span class="operator"><</span><span class="type"><a href="qpushbutton.html">QPushButton</a></span><span class="operator">*</span><span class="operator">></span>(<span class="string">"findButton"</span>);
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ui_textEdit <span class="operator">=</span> findChild<span class="operator"><</span><span class="type"><a href="qtextedit.html">QTextEdit</a></span><span class="operator">*</span><span class="operator">></span>(<span class="string">"textEdit"</span>);
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ui_lineEdit <span class="operator">=</span> findChild<span class="operator"><</span><span class="type"><a href="qlineedit.html">QLineEdit</a></span><span class="operator">*</span><span class="operator">></span>(<span class="string">"lineEdit"</span>);</pre>
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<p>We then use <a href="qmetaobject.html">QMetaObject</a>'s system to enable signal and slot connections.</p>
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<pre class="cpp"> <span class="type"><a href="qmetaobject.html">QMetaObject</a></span><span class="operator">::</span>connectSlotsByName(<span class="keyword">this</span>);</pre>
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<p>The loadTextFile() function is called to load <tt>input.txt</tt> into <a href="qtextedit.html">QTextEdit</a> to displays its contents.</p>
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<pre class="cpp"> loadTextFile();</pre>
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<p>The <tt>TextFinder</tt>'s layout is set with <a href="qwidget.html#setLayout">setLayout()</a>.</p>
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<pre class="cpp"> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>layout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
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layout<span class="operator">-</span><span class="operator">></span>addWidget(formWidget);
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setLayout(layout);</pre>
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<p>Finally, the window title is set to <i>Text Finder</i> and <tt>isFirstTime</tt> is set to true.</p>
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<p><tt>isFirstTime</tt> is used as a flag to indicate whether the search operation has been performed more than once. This is further explained with the <tt>on_findButton_clicked()</tt> function.</p>
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<p>The <tt>loadUiFile()</tt> function is used to load the user interface file previously created in <a href="qtdesigner.html">QtDesigner</a>. The <a href="quiloader.html">QUiLoader</a> class is instantiated and its <tt>load()</tt> function is used to load the form into <tt>formWidget</tt> that acts as a place holder for the user interface. The function then returns <tt>formWidget</tt> to its caller.</p>
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<pre class="cpp"> <span class="type"><a href="qwidget.html">QWidget</a></span><span class="operator">*</span> TextFinder<span class="operator">::</span>loadUiFile()
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{
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<span class="type"><a href="quiloader.html">QUiLoader</a></span> loader;
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<span class="type"><a href="qfile.html">QFile</a></span> file(<span class="string">":/forms/textfinder.ui"</span>);
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file<span class="operator">.</span>open(<span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>ReadOnly);
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<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>formWidget <span class="operator">=</span> loader<span class="operator">.</span>load(<span class="operator">&</span>file<span class="operator">,</span> <span class="keyword">this</span>);
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file<span class="operator">.</span>close();
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<span class="keyword">return</span> formWidget;
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}</pre>
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<p>As mentioned earlier, the loadTextFile() function loads <i>input.txt</i> into <a href="qtextedit.html">QTextEdit</a> to display its contents. Data is read using <a href="qtextstream.html">QTextStream</a> into a <a href="qstring.html">QString</a> object, <tt>line</tt> with the <a href="qtextstream.html#readAll">QTextStream::readAll</a>() function. The contents of <tt>line</tt> are then appended to <tt>ui_textEdit</tt>.</p>
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<pre class="cpp"> <span class="type">void</span> TextFinder<span class="operator">::</span>loadTextFile()
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{
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<span class="type"><a href="qfile.html">QFile</a></span> inputFile(<span class="string">":/forms/input.txt"</span>);
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inputFile<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly);
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<span class="type"><a href="qtextstream.html">QTextStream</a></span> in(<span class="operator">&</span>inputFile);
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<span class="type"><a href="qstring.html">QString</a></span> line <span class="operator">=</span> in<span class="operator">.</span>readAll();
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inputFile<span class="operator">.</span>close();
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ui_textEdit<span class="operator">-</span><span class="operator">></span>append(line);
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ui_textEdit<span class="operator">-</span><span class="operator">></span>setUndoRedoEnabled(<span class="keyword">false</span>);
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ui_textEdit<span class="operator">-</span><span class="operator">></span>setUndoRedoEnabled(<span class="keyword">true</span>);
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}</pre>
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<p>The <tt>on_findButton_clicked()</tt> function is a slot that is connected to <tt>ui_findButton</tt>'s <tt>clicked()</tt> signal. The <tt>searchString</tt> is extracted from the <tt>ui_lineEdit</tt> and the <tt>document</tt> is extracted from <tt>textEdit</tt>. In event there is an empty <tt>searchString</tt>, a <a href="qmessagebox.html">QMessageBox</a> is used, requesting the user to enter a word. Otherwise, we traverse through the words in <tt>ui_textEdit</tt>, and highlight all ocurrences of the <tt>searchString</tt> . Two <a href="qtextcursor.html">QTextCursor</a> objects are used: One to traverse through the words in <tt>line</tt> and another to keep track of the edit blocks.</p>
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<pre class="cpp"> <span class="type">void</span> TextFinder<span class="operator">::</span>on_findButton_clicked()
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{
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<span class="type"><a href="qstring.html">QString</a></span> searchString <span class="operator">=</span> ui_lineEdit<span class="operator">-</span><span class="operator">></span>text();
|
|
<span class="type"><a href="qtextdocument.html">QTextDocument</a></span> <span class="operator">*</span>document <span class="operator">=</span> ui_textEdit<span class="operator">-</span><span class="operator">></span>document();
|
|
|
|
<span class="type">bool</span> found <span class="operator">=</span> <span class="keyword">false</span>;
|
|
|
|
<span class="keyword">if</span> (isFirstTime <span class="operator">=</span><span class="operator">=</span> <span class="keyword">false</span>)
|
|
document<span class="operator">-</span><span class="operator">></span>undo();
|
|
|
|
<span class="keyword">if</span> (searchString<span class="operator">.</span>isEmpty()) {
|
|
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Empty Search Field"</span>)<span class="operator">,</span>
|
|
<span class="string">"The search field is empty. Please enter a word and click Find."</span>);
|
|
} <span class="keyword">else</span> {
|
|
|
|
<span class="type"><a href="qtextcursor.html">QTextCursor</a></span> highlightCursor(document);
|
|
<span class="type"><a href="qtextcursor.html">QTextCursor</a></span> cursor(document);
|
|
|
|
cursor<span class="operator">.</span>beginEditBlock();
|
|
|
|
<span class="type"><a href="qtextcharformat.html">QTextCharFormat</a></span> plainFormat(highlightCursor<span class="operator">.</span>charFormat());
|
|
<span class="type"><a href="qtextcharformat.html">QTextCharFormat</a></span> colorFormat <span class="operator">=</span> plainFormat;
|
|
colorFormat<span class="operator">.</span>setForeground(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>red);
|
|
|
|
<span class="keyword">while</span> (<span class="operator">!</span>highlightCursor<span class="operator">.</span>isNull() <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>highlightCursor<span class="operator">.</span>atEnd()) {
|
|
highlightCursor <span class="operator">=</span> document<span class="operator">-</span><span class="operator">></span>find(searchString<span class="operator">,</span> highlightCursor<span class="operator">,</span> <span class="type"><a href="qtextdocument.html">QTextDocument</a></span><span class="operator">::</span>FindWholeWords);
|
|
|
|
<span class="keyword">if</span> (<span class="operator">!</span>highlightCursor<span class="operator">.</span>isNull()) {
|
|
found <span class="operator">=</span> <span class="keyword">true</span>;
|
|
highlightCursor<span class="operator">.</span>movePosition(<span class="type"><a href="qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>WordRight<span class="operator">,</span>
|
|
<span class="type"><a href="qtextcursor.html">QTextCursor</a></span><span class="operator">::</span>KeepAnchor);
|
|
highlightCursor<span class="operator">.</span>mergeCharFormat(colorFormat);
|
|
}
|
|
}
|
|
|
|
cursor<span class="operator">.</span>endEditBlock();</pre>
|
|
<p>The <tt>isFirstTime</tt> flag is set to false the moment <tt>findButton</tt> is clicked. This is necessary to undo the previous text highlight before highlighting the user's next search string. Also, the <tt>found</tt> flag is used to indicate if the <tt>searchString</tt> was found within the contents of <tt>ui_textEdit</tt>. If it was not found, a <a href="qmessagebox.html">QMessageBox</a> is used to inform the user.</p>
|
|
<pre class="cpp"> isFirstTime <span class="operator">=</span> <span class="keyword">false</span>;
|
|
|
|
<span class="keyword">if</span> (found <span class="operator">=</span><span class="operator">=</span> <span class="keyword">false</span>) {
|
|
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Word Not Found"</span>)<span class="operator">,</span>
|
|
<span class="string">"Sorry, the word cannot be found."</span>);
|
|
}
|
|
}
|
|
}</pre>
|
|
<a name="function"></a>
|
|
<h2><tt>main()</tt> Function</h2>
|
|
<pre class="cpp"> <span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
|
|
{
|
|
Q_INIT_RESOURCE(textfinder);
|
|
<span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
|
|
|
|
TextFinder <span class="operator">*</span>textFinder <span class="operator">=</span> <span class="keyword">new</span> TextFinder;
|
|
textFinder<span class="operator">-</span><span class="operator">></span>show();
|
|
|
|
<span class="keyword">return</span> app<span class="operator">.</span>exec();
|
|
}</pre>
|
|
<p>The <tt>main()</tt> function initialises the <i>textfinder.qrc</i> resource file and instantiates as well as displays <tt>TextFinder</tt>.</p>
|
|
</div>
|
|
<p><b>See also </b><a href="designer-calculatorbuilder.html">Calculator Builder Example</a> and <a href="designer-worldtimeclockbuilder.html">World Time Clock Builder Example</a>.</p>
|
|
<!-- @@@uitools/textfinder -->
|
|
</div>
|
|
</div>
|
|
</div>
|
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<div class="ft">
|
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<span></span>
|
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</div>
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</div>
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<p>
|
|
<acronym title="Copyright">©</acronym> 2015 The Qt Company Ltd.
|
|
Documentation contributions included herein are the copyrights of
|
|
their respective owners.</p>
|
|
<br />
|
|
<p>
|
|
The documentation provided herein is licensed under the terms of the
|
|
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
|
|
License version 1.3</a> as published by the Free Software Foundation.</p>
|
|
<p>
|
|
Documentation sources may be obtained from <a href="http://www.qt-project.org">
|
|
www.qt-project.org</a>.</p>
|
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<br />
|
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<p>
|
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Qt and respective logos are trademarks of The Qt Company Ltd
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in Finland and/or other countries worldwide. All other trademarks are property
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of their respective owners. <a title="Privacy Policy"
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href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
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