| 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 (qt-info@nokia.com)
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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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| 18 | ** Documentation License version 1.3 as published by the Free Software
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| 19 | ** Foundation and appearing in the file included in the packaging of this
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| 20 | ** file.
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| 21 | **
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| 22 | ** If you have questions regarding the use of this file, please contact
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| 23 | ** Nokia at qt-info@nokia.com.
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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 | \example statemachine/eventtransitions
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| 30 | \title Event Transitions Example
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| 31 |
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| 32 | The Event Transitions example shows how to use event transitions, a
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| 33 | feature of \l{The State Machine Framework}.
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| 34 |
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| 35 | \snippet examples/statemachine/eventtransitions/main.cpp 0
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| 36 |
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| 37 | The \c Window class's constructors begins by creating a button.
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| 38 |
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| 39 | \snippet examples/statemachine/eventtransitions/main.cpp 1
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| 40 |
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| 41 | Two states, \c s1 and \c s2, are created; upon entry they will assign
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| 42 | "Outside" and "Inside" to the button's text, respectively.
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| 43 |
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| 44 | \snippet examples/statemachine/eventtransitions/main.cpp 2
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| 45 |
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| 46 | When the button receives an event of type QEvent::Enter and the state
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| 47 | machine is in state \c s1, the machine will transition to state \c s2.
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| 48 |
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| 49 | \snippet examples/statemachine/eventtransitions/main.cpp 3
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| 50 |
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| 51 | When the button receives an event of type QEvent::Leave and the state
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| 52 | machine is in state \c s2, the machine will transition back to state \c
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| 53 | s1.
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| 54 |
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| 55 | \snippet examples/statemachine/eventtransitions/main.cpp 4
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| 56 |
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| 57 | Next, the state \c s3 is created. \c s3 will be entered when the button
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| 58 | receives an event of type QEvent::MouseButtonPress and the state machine
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| 59 | is in state \c s2. When the button receives an event of type
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| 60 | QEvent::MouseButtonRelease and the state machine is in state \c s3, the
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| 61 | machine will transition back to state \c s2.
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| 62 |
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| 63 | \snippet examples/statemachine/eventtransitions/main.cpp 5
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| 64 |
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| 65 | Finally, the states are added to the machine as top-level states, the
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| 66 | initial state is set to be \c s1 ("Outside"), and the machine is started.
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| 67 |
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| 68 | \snippet examples/statemachine/eventtransitions/main.cpp 6
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| 69 |
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| 70 | The main() function constructs a Window object and shows it.
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| 71 |
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| 72 | */
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