| 1 | /****************************************************************************
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| 2 | **
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| 3 | ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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| 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation ([email protected])
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| 6 | **
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| 7 | ** This file is part of the documentation of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:FDL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in a
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| 14 | ** written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Free Documentation License
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Free
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| 22 | ** If you have questions regarding the use of this file, please contact
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| 23 | ** Nokia at [email protected].
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| 24 | ** $QT_END_LICENSE$
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| 26 | ****************************************************************************/
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| 27 |
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| 28 | /*!
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| 29 | \page qaxserver-demo-hierarchy.html
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| 30 | \title Qt Widget Hierarchy
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| 31 |
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| 32 | \input examples/activeqt/hierarchy-demo.qdocinc
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| 33 | */
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| 34 |
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| 35 | /*!
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| 36 | \example activeqt/hierarchy
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| 37 | \title Hierarchy Example (ActiveQt)
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| 38 |
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| 39 | The Hierarchy example is shows how to write an in-process ActiveX
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| 40 | control. The control is a QWidget subclass with child widgets
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| 41 | that are accessible as sub-types.
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| 42 |
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| 43 | \snippet examples/activeqt/hierarchy/objects.h 0
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| 44 | The \c QParentWidget class provides slots to create a widget
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| 45 | with a name, and to return a pointer to a named widget. The class
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| 46 | declaration uses \c Q_CLASSINFO() to provide the COM identifiers for
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| 47 | this class.
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| 48 |
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| 49 | \snippet examples/activeqt/hierarchy/objects.cpp 0
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| 50 | The constructor of QParentWidget creates a vertical box layout.
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| 51 | New child widgets are automatically added to the layout.
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| 52 |
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| 53 | \snippet examples/activeqt/hierarchy/objects.cpp 1
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| 54 | The \c createSubWidget slot creates a new \c QSubWidget with
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| 55 | the name provided in the parameter, and sets the label to that
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| 56 | name. The widget is also shown explicitly.
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| 57 |
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| 58 | \snippet examples/activeqt/hierarchy/objects.cpp 2
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| 59 | The \c subWidget slot uses the \c QObject::child() function and
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| 60 | returns the first child of type \c QSubWidget that has the requested
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| 61 | name.
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| 62 |
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| 63 | \snippet examples/activeqt/hierarchy/objects.h 1
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| 64 | The \c QSubWidget class has a single string-property \c label,
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| 65 | and implements the paintEvent to draw the label. The class uses
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| 66 | again \c Q_CLASSINFO to provide the COM identifiers, and also sets
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| 67 | the \e ToSuperClass attribute to \e QSubWidget, to ensure that only
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| 68 | no slots of any superclasses (i.e. QWidget) are exposed.
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| 69 |
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| 70 | \snippet examples/activeqt/hierarchy/objects.cpp 3
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| 71 | \snippet examples/activeqt/hierarchy/objects.cpp 4
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| 72 | The implementation of the QSubWidget class is self-explanatory.
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| 73 |
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| 74 | \snippet examples/activeqt/hierarchy/main.cpp 0
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| 75 | The classes are then exported using a QAxFactory. \c QParentWidget is
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| 76 | exported as a full class (which can be created ), while \c QSubWidget is
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| 77 | only exported as a type, which can only be created indirectly through
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| 78 | APIs of \c QParentWidget.
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| 79 |
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| 80 | To build the example you must first build the QAxServer library.
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| 81 | Then run qmake and your make tool in \c examples/activeqt/hierarchy.
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| 82 |
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| 83 | The \l{qaxserver-demo-hierarchy.html}{demonstration} requires
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| 84 | your WebBrowser to support ActiveX controls, and scripting to be
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| 85 | enabled.
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| 86 |
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| 87 | \snippet examples/activeqt/hierarchy-demo.qdocinc 0
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| 88 | */
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