diff options
Diffstat (limited to 'doc/src/objectmodel/properties.qdoc')
| -rw-r--r-- | doc/src/objectmodel/properties.qdoc | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/doc/src/objectmodel/properties.qdoc b/doc/src/objectmodel/properties.qdoc index 7d1ecec..92c182e 100644 --- a/doc/src/objectmodel/properties.qdoc +++ b/doc/src/objectmodel/properties.qdoc @@ -46,12 +46,12 @@ To declare a property, use the \l {Q_PROPERTY()} {Q_PROPERTY()} macro in a class that inherits QObject. - \snippet doc/src/snippets/code/doc_src_properties.qdoc 0 + \snippet doc/src/snippets/code/doc_src_properties.cpp 0 Here are some typical examples of property declarations taken from class QWidget. - \snippet doc/src/snippets/code/doc_src_properties.qdoc 1 + \snippet doc/src/snippets/code/doc_src_properties.cpp 1 A property behaves like a class data member, but it has additional features accessible through the \l {Meta-Object System}. @@ -83,6 +83,10 @@ existing signal in that class that is emitted whenever the value of the property changes. + \o A \c REVISION number is optional. If included, it defines the + the property and its notifier signal to be used in a particular + revision of the API that is exposed to QML. + \o The \c DESIGNABLE attribute indicates whether the property should be visible in the property editor of GUI design tool (e.g., \l {Qt Designer}). Most properties are \c DESIGNABLE (default @@ -131,7 +135,7 @@ be a user-defined type. In this example, class QDate is considered to be a user-defined type. - \snippet doc/src/snippets/code/doc_src_properties.qdoc 2 + \snippet doc/src/snippets/code/doc_src_properties.cpp 2 Because QDate is user-defined, you must include the \c{<QDate>} header file with the property declaration. @@ -152,7 +156,7 @@ the code snippet below, the call to QAbstractButton::setDown() and the call to QObject::setProperty() both set property "down". - \snippet doc/src/snippets/code/doc_src_properties.qdoc 3 + \snippet doc/src/snippets/code/doc_src_properties.cpp 3 Accessing a property through its \c WRITE accessor is the better of the two, because it is faster and gives better diagnostics at @@ -162,7 +166,7 @@ can \e discover a class's properties at run time by querying its QObject, QMetaObject, and \l {QMetaProperty} {QMetaProperties}. - \snippet doc/src/snippets/code/doc_src_properties.qdoc 4 + \snippet doc/src/snippets/code/doc_src_properties.cpp 4 In the above snippet, QMetaObject::property() is used to get \l {QMetaProperty} {metadata} about each property defined in some @@ -189,7 +193,7 @@ for the \c READ and \c WRITE functions. The declaration of MyClass then might look like this: - \snippet doc/src/snippets/code/doc_src_properties.qdoc 5 + \snippet doc/src/snippets/code/doc_src_properties.cpp 5 The \c READ function is const and returns the property type. The \c WRITE function returns void and has exactly one parameter of @@ -200,7 +204,7 @@ QObject that is an instance of MyClass, we have two ways to set its priority property: - \snippet doc/src/snippets/code/doc_src_properties.qdoc 6 + \snippet doc/src/snippets/code/doc_src_properties.cpp 6 In the example, the enumeration type that is the property type is declared in MyClass and registered with the \l{Meta-Object System} @@ -262,7 +266,7 @@ Q_CLASSINFO(), that can be used to attach additional \e{name}--\e{value} pairs to a class's meta-object, for example: - \snippet doc/src/snippets/code/doc_src_properties.qdoc 7 + \snippet doc/src/snippets/code/doc_src_properties.cpp 7 Like other meta-data, class information is accessible at run-time through the meta-object; see QMetaObject::classInfo() for details. |