8.2.1. Finding Children

8.2.1. Finding Children
	8.2. Composite Pattern: Parents and Children

[ fromfile: children.xml id: findchildren ]

QObject has a member function that returns a list of pointers to all the child objects of the host object.

The prototype for this function is

const QObjectList& QObject::children() const

QObject also provides two overloaded (recursive) functions named findChildren().
Each returns a list of children that satisfy certain conditions.

QList<T> parentObj.findChildren<T> ( const QString& name = QString() ) const

If name is the empty string, findChildren() works as a class filter – returning a QList of pointers to all children that can can be cast to type T.^[37]

Example 8.1. src/findchildren/findchildren.cpp

[ . . . . ]
/* Filter on Customer* */
    QList<Customer*> custlist = parent.findChildren<Customer*>();
    foreach (const Customer* current, custlist) {
        qDebug() << current->toString();
    }
[ . . . . ]

^[37]Section 19.7 discusses type conversion and casting.


8.2. Composite Pattern: Parents and Children		8.2.2. QObject's Child Managment