diff options
Diffstat (limited to 'src/corelib/doc/src')
| -rw-r--r-- | src/corelib/doc/src/objectmodel/bindableproperties.qdoc | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/src/corelib/doc/src/objectmodel/bindableproperties.qdoc b/src/corelib/doc/src/objectmodel/bindableproperties.qdoc index 8b50c65d7c..1bb20935d0 100644 --- a/src/corelib/doc/src/objectmodel/bindableproperties.qdoc +++ b/src/corelib/doc/src/objectmodel/bindableproperties.qdoc @@ -50,8 +50,7 @@ The binding expression computes the value by reading other QProperty values. Behind the scenes this dependency is tracked. Whenever a change in any property's dependency is detected, the binding expression is re-evaluated and the new - result is applied to the property. This happens lazily, by marking the binding - as dirty and evaluating it only when the property's value is requested. For example: + result is applied to the property. For example: \code QProperty<QString> firstname("John"); @@ -63,20 +62,19 @@ qDebug() << fullname.value(); // Prints "John Smith age: 41" - firstname = "Emma"; // Marks binding expression as dirty + firstname = "Emma"; // Triggers binding reevaluation - qDebug() << fullname.value(); // Re-evaluates the binding expression and prints "Emma Smith age: 41" + qDebug() << fullname.value(); // Prints the new value "Emma Smith age: 41" // Birthday is coming up - age.setValue(age.value() + 1); + age.setValue(age.value() + 1); // Triggers re-evaluation - qDebug() << fullname.value(); // Re-evaluates the binding expression and prints "Emma Smith age: 42" + qDebug() << fullname.value(); // Prints "Emma Smith age: 42" \endcode When a new value is assigned to the \c firstname property, the binding - expression for \c fullname is marked as dirty. So when the last \c qDebug() statement - tries to read the name value of the \c fullname property, the expression is - evaluated again, \c firstname() will be called again and return the new value. + expression for \c fullname is reevaluated. So when the last \c qDebug() statement + tries to read the name value of the \c fullname property, the new value is returned. Since bindings are C++ functions, they may do anything that's possible in C++. This includes calling other functions. If those functions access values |