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<p>Qt v4.7 introduced QML as a means of declaratively describing a user interface
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and using JavaScript as a scripting language within QML. It is possible to
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write complete standalone QML applications, or to combine them with C++.</p>
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<p>PyQt supports the integration of Python and QML as far as it can - given the
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<p>PyQt4 supports the integration of Python and QML as far as it can - given the
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limitations of the QML implementation.</p>
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<p>There are three types of QML application:</p>
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<ul class="simple">
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<li><em>Pure</em> applications that are written entirely in QML and can be run using the
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<strong class="program">qmlviewer</strong> tool provided with Qt. PyQt fully supports this type of
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application. The examples provided by <strong class="program">qtdemo.py</strong> under the <em>Qt
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<strong class="program">qmlviewer</strong> tool provided with Qt. PyQt4 fully supports this type
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of application. The examples provided by <strong class="program">qtdemo.py</strong> under the <em>Qt
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Declarative Examples</em> heading are all of this type.</li>
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<li>QML allows <tt class="docutils literal"><span class="pre">QObject</span></tt> instances to be used in QML applications. QML code is
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able to call an object’s slots and has read and write access to the object’s
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properties. QML code can also respond to changes to the value of a property.
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PyQt fully supports the use objects created in Python in this way. The
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PyQt4 fully supports the use objects created in Python in this way. The
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<strong class="program">minehunt.py</strong> example under the <em>Demonstrations</em> heading of
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<strong class="program">qtdemo.py</strong> is an example of this type of application.</li>
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<li>QML also allows <tt class="docutils literal"><span class="pre">QObject</span></tt> sub-classes to be used in QML applications so
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that new instances are created from QML. PyQt does not support this. The
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that new instances are created from QML. PyQt4 does not support this. The
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reason is that QML uses information generated at compile time (specifically
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it uses <tt class="docutils literal"><span class="pre">QObject::staticMetaObject</span></tt>) rather than information created
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dynamically at run time (i.e. <tt class="docutils literal"><span class="pre">QObject::metaObject()</span></tt>). This approach is
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place any restriction on the functionality of a Python/QML application, it
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only places restrictions on how that application is written.</li>
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<p>QML can implement JavaScript functions and define signals. PyQt allows both of
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these to be accessed transparently from Python. The following is a simple
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<p>QML can implement JavaScript functions and define signals. PyQt4 allows both
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of these to be accessed transparently from Python. The following is a simple
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example application that displays the current date and time when the user
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<p>The following is the QML (in the <tt class="file docutils literal"><span class="pre">message.qml</span></tt>) that defines the user
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doc/html/qml.html
