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<h1 class="title">Qt Script Tetrix Example</h1>
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<p>Files:</p>
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<li><a href="script-qstetrix-tetrixboard-cpp.html">script/qstetrix/tetrixboard.cpp</a></li>
<li><a href="script-qstetrix-tetrixboard-h.html">script/qstetrix/tetrixboard.h</a></li>
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<li><a href="script-qstetrix-tetrixpiece-js.html">script/qstetrix/tetrixpiece.js</a></li>
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<p>The QSTetrix example is a Qt Script version of the classic Tetrix game.<p class="centerAlign"><img src="images/tetrix-example.png" alt="" /></p><a name="overview"></a>
<h2>Overview</h2>
<p>The program logic in this example is a fairly straight port of the logic in the C++ <a href="widgets-tetrix.html">Tetrix Example</a>. You may find it useful to compare the implementations of the <tt>TetrixBoard</tt>, <tt>TetrixPiece</tt> and <tt>TetrixWindow</tt> classes to see how Qt Script is used to implement methods, call Qt functions, and emit signals.</p>
<a name="setting-up-the-gui"></a>
<h2>Setting up the GUI</h2>
<p>The graphical user interface is defined in a UI file, created using Qt Designer, and is set up in the example's C++ <tt>main.cpp</tt> file.</p>
<pre class="cpp"> <span class="keyword">class</span> TetrixUiLoader : <span class="keyword">public</span> <span class="type"><a href="quiloader.html">QUiLoader</a></span>
{
<span class="keyword">public</span>:
TetrixUiLoader(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>)
: <span class="type"><a href="quiloader.html">QUiLoader</a></span>(parent)
{ }
<span class="keyword">virtual</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>createWidget(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>className<span class="operator">,</span> <span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span>
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&</span>name <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>())
{
<span class="keyword">if</span> (className <span class="operator">=</span><span class="operator">=</span> QLatin1String(<span class="string">"TetrixBoard"</span>)) {
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>board <span class="operator">=</span> <span class="keyword">new</span> TetrixBoard(parent);
board<span class="operator">-</span><span class="operator">></span>setObjectName(name);
<span class="keyword">return</span> board;
}
<span class="keyword">return</span> <span class="type"><a href="quiloader.html">QUiLoader</a></span><span class="operator">::</span>createWidget(className<span class="operator">,</span> parent<span class="operator">,</span> name);
}
};</pre>
<p>We define a custom UI loader that handles our <tt>TetrixBoard</tt> widget; this is the main component of the UI (where the pieces are drawn).</p>
<pre class="cpp"> <span class="type"><a href="qapplication.html">QApplication</a></span> app(argc<span class="operator">,</span> argv);
<span class="type"><a href="qscriptengine.html">QScriptEngine</a></span> engine;
<span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> <span class="type"><a href="qt.html">Qt</a></span> <span class="operator">=</span> engine<span class="operator">.</span>newQMetaObject(<span class="type">QtMetaObject</span><span class="operator">::</span>get());
<span class="type"><a href="qt.html">Qt</a></span><span class="operator">.</span>setProperty(<span class="string">"App"</span><span class="operator">,</span> engine<span class="operator">.</span>newQObject(<span class="operator">&</span>app));
engine<span class="operator">.</span>globalObject()<span class="operator">.</span>setProperty(<span class="string">"Qt"</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span>);</pre>
<p>We initialize the script engine to have the Qt namespace, so that e.g., <a href="qt.html#Key-enum">Qt.Key_Left</a> will be available to script code. We also make the application object available (for the <a href="qcoreapplication.html#quit">quit()</a> slot).</p>
<pre class="cpp"> evaluateFile(engine<span class="operator">,</span> <span class="string">":/tetrixpiece.js"</span>);
evaluateFile(engine<span class="operator">,</span> <span class="string">":/tetrixboard.js"</span>);
evaluateFile(engine<span class="operator">,</span> <span class="string">":/tetrixwindow.js"</span>);</pre>
<p>Several scripts are evaluated as part of the engine setup process. The <tt>tetrixpiece.js</tt> file contains the definition of the <tt>TetrixPiece</tt> class, which is used to populate the play field. The <tt>tetrixboard.js</tt> file contains the definition of the <tt>TetrixBoard</tt> class, which contains the main game logic. Finally, <tt>tetrixwindow.js</tt> contains the definition of the <tt>TetrixWindow</tt> class, which wires up the top-level widget.</p>
<pre class="cpp"> TetrixUiLoader loader;
<span class="type"><a href="qfile.html">QFile</a></span> uiFile(<span class="string">":/tetrixwindow.ui"</span>);
uiFile<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>ReadOnly);
<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>ui <span class="operator">=</span> loader<span class="operator">.</span>load(<span class="operator">&</span>uiFile);
uiFile<span class="operator">.</span>close();
<span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> ctor <span class="operator">=</span> engine<span class="operator">.</span>evaluate(<span class="string">"TetrixWindow"</span>);
<span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> scriptUi <span class="operator">=</span> engine<span class="operator">.</span>newQObject(ui<span class="operator">,</span> <span class="type"><a href="qscriptengine.html">QScriptEngine</a></span><span class="operator">::</span>ScriptOwnership);
<span class="type"><a href="qscriptvalue.html">QScriptValue</a></span> tetrix <span class="operator">=</span> ctor<span class="operator">.</span>construct(<span class="type">QScriptValueList</span>() <span class="operator"><</span><span class="operator"><</span> scriptUi);</pre>
<p>A form is created from the UI file. A new <tt>TetrixWindow</tt> script object is then constructed, passing the form as its argument.</p>
<pre class="cpp"> ui<span class="operator">-</span><span class="operator">></span>resize(<span class="number">550</span><span class="operator">,</span> <span class="number">370</span>);
ui<span class="operator">-</span><span class="operator">></span>show();
qsrand(<span class="type"><a href="qtime.html">QTime</a></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="operator">.</span>secsTo(<span class="type"><a href="qtime.html">QTime</a></span><span class="operator">::</span>currentTime()));
<span class="keyword">return</span> app<span class="operator">.</span>exec();</pre>
<p>The form is shown, and the event loop is entered.</p>
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