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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 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 QtDeclarative module of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #include "qdeclarativeparserstatus.h" |
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43 |
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44 QT_BEGIN_NAMESPACE |
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45 |
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46 /*! |
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47 \class QDeclarativeParserStatus |
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48 \since 4.7 |
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49 \brief The QDeclarativeParserStatus class provides updates on the QML parser state. |
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50 |
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51 QDeclarativeParserStatus provides a mechanism for classes instantiated by |
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52 a QDeclarativeEngine to receive notification at key points in their creation. |
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53 |
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54 This class is often used for optimization purposes, as it allows you to defer an |
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55 expensive operation until after all the properties have been set on an |
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56 object. For example, QML's \l {Text} element uses the parser status |
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57 to defer text layout until all of its properties have been set (we |
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58 don't want to layout when the \c text is assigned, and then relayout |
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59 when the \c font is assigned, and relayout again when the \c width is assigned, |
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60 and so on). |
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61 |
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62 To use QDeclarativeParserStatus, you must inherit both a QObject-derived class |
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63 and QDeclarativeParserStatus, and use the Q_INTERFACES() macro. |
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64 |
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65 \code |
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66 class MyObject : public QObject, public QDeclarativeParserStatus |
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67 { |
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68 Q_OBJECT |
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69 Q_INTERFACES(QDeclarativeParserStatus) |
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70 |
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71 public: |
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72 MyObject(QObject *parent = 0); |
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73 ... |
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74 void classBegin(); |
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75 void componentComplete(); |
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76 } |
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77 \endcode |
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78 */ |
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79 |
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80 /*! \internal */ |
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81 QDeclarativeParserStatus::QDeclarativeParserStatus() |
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82 : d(0) |
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83 { |
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84 } |
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85 |
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86 /*! \internal */ |
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87 QDeclarativeParserStatus::~QDeclarativeParserStatus() |
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88 { |
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89 if(d) |
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90 (*d) = 0; |
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91 } |
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92 |
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93 /*! |
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94 \fn void QDeclarativeParserStatus::classBegin() |
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95 |
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96 Invoked after class creation, but before any properties have been set. |
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97 */ |
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98 |
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99 /*! |
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100 \fn void QDeclarativeParserStatus::componentComplete() |
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101 |
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102 Invoked after the root component that caused this instantiation has |
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103 completed construction. At this point all static values and binding values |
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104 have been assigned to the class. |
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105 */ |
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106 |
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107 QT_END_NAMESPACE |