class QMetaMethod#

The QMetaMethod class provides meta-data about a member function. More…

Synopsis#

Methods#

def __init__()
def access()
def enclosingMetaObject()
def invoke()
def invokeOnGadget()
def isConst()
def isValid()
def methodIndex()
def methodSignature()
def methodType()
def name()
def __ne__()
def __eq__()
def parameterCount()
def parameterMetaType()
def parameterNames()
def parameterType()
def parameterTypeName()
def parameterTypes()
def relativeMethodIndex()
def returnMetaType()
def returnType()
def revision()
def tag()
def typeName()

Static functions#

def fromSignal()

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description#

A QMetaMethod has a methodType() , a methodSignature() , a list of parameterTypes() and parameterNames() , a return typeName() , a tag() , and an access() specifier. You can use invoke() to invoke the method on an arbitrary QObject .

See also

QMetaObject QMetaEnum QMetaProperty Qt’s Property System

class Access#

This enum describes the access level of a method, following the conventions used in C++.

Constant

Description

QMetaMethod.Private

QMetaMethod.Protected

QMetaMethod.Public

Constant	Description
QMetaMethod.Private
QMetaMethod.Protected
QMetaMethod.Public

class MethodType#

Constant	Description
QMetaMethod.Method	The function is a plain member function.
QMetaMethod.Signal	The function is a signal.
QMetaMethod.Slot	The function is a slot.
QMetaMethod.Constructor	The function is a constructor.

__init__()#

access()#

Return type:: Access

Returns the access specification of this method (private, protected, or public).

Note

Signals are always public, but you should regard that as an implementation detail. It is almost always a bad idea to emit a signal from outside its class.

See also

methodType()

enclosingMetaObject()#

Return type:: QMetaObject

static fromSignal(signal)#

Parameters:: signal – PySideSignalInstance
Return type:: QMetaMethod

Returns the meta-method that corresponds to the given signal, or an invalid QMetaMethod if signal is not a signal of the class.

invoke(object, val0[, val1=QGenericArgument()[, val2=QGenericArgument()[, val3=QGenericArgument()[, val4=QGenericArgument()[, val5=QGenericArgument()[, val6=QGenericArgument()[, val7=QGenericArgument()[, val8=QGenericArgument()[, val9=QGenericArgument()]]]]]]]]])#

Parameters:

object – QObject
val0 – QGenericArgument
val1 – QGenericArgument
val2 – QGenericArgument
val3 – QGenericArgument
val4 – QGenericArgument
val5 – QGenericArgument
val6 – QGenericArgument
val7 – QGenericArgument
val8 – QGenericArgument
val9 – QGenericArgument

Return type:

bool

Please use the variadic overload of this function

This function overloads invoke() .

This overload invokes this method using the connection type AutoConnection and ignores return values.

invoke(object, returnValue[, val0=QGenericArgument(nullptr)[, val1=QGenericArgument()[, val2=QGenericArgument()[, val3=QGenericArgument()[, val4=QGenericArgument()[, val5=QGenericArgument()[, val6=QGenericArgument()[, val7=QGenericArgument()[, val8=QGenericArgument()[, val9=QGenericArgument()]]]]]]]]]])

Parameters:

object – QObject
returnValue – QGenericReturnArgument
val0 – QGenericArgument
val1 – QGenericArgument
val2 – QGenericArgument
val3 – QGenericArgument
val4 – QGenericArgument
val5 – QGenericArgument
val6 – QGenericArgument
val7 – QGenericArgument
val8 – QGenericArgument
val9 – QGenericArgument

Return type:

bool

Please use the variadic overload of this function

This function overloads invoke() .

This overload always invokes this method using the connection type AutoConnection .

invoke(object, connectionType, val0[, val1=QGenericArgument()[, val2=QGenericArgument()[, val3=QGenericArgument()[, val4=QGenericArgument()[, val5=QGenericArgument()[, val6=QGenericArgument()[, val7=QGenericArgument()[, val8=QGenericArgument()[, val9=QGenericArgument()]]]]]]]]])

Parameters:

object – QObject
connectionType – ConnectionType
val0 – QGenericArgument
val1 – QGenericArgument
val2 – QGenericArgument
val3 – QGenericArgument
val4 – QGenericArgument
val5 – QGenericArgument
val6 – QGenericArgument
val7 – QGenericArgument
val8 – QGenericArgument
val9 – QGenericArgument

Return type:

bool

Please use the variadic overload of this function

This function overloads invoke() .

This overload can be used if the return value of the member is of no interest.

invoke(object, connectionType, returnValue[, val0=QGenericArgument(nullptr)[, val1=QGenericArgument()[, val2=QGenericArgument()[, val3=QGenericArgument()[, val4=QGenericArgument()[, val5=QGenericArgument()[, val6=QGenericArgument()[, val7=QGenericArgument()[, val8=QGenericArgument()[, val9=QGenericArgument()]]]]]]]]]])

Parameters:

object – QObject
connectionType – ConnectionType
returnValue – QGenericReturnArgument
val0 – QGenericArgument
val1 – QGenericArgument
val2 – QGenericArgument
val3 – QGenericArgument
val4 – QGenericArgument
val5 – QGenericArgument
val6 – QGenericArgument
val7 – QGenericArgument
val8 – QGenericArgument
val9 – QGenericArgument

Return type:

bool

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

Please use the variadic overload of this function

Invokes this method on the object object. Returns true if the member could be invoked. Returns false if there is no such member or the parameters did not match.

See the variadic invokeMethod() function for more information. This function should behave the same way as that one, with the following limitations:

The number of parameters is limited to 10.

Parameter names may need to be an exact string match.

Meta types are not automatically registered.

With asynchronous method invocations, the parameters must be of types that are known to Qt’s meta-object system, because Qt needs to copy the arguments to store them in an event behind the scenes. If you try to use a queued connection and get the error message

QMetaMethod.invoke: Unable to handle unregistered datatype 'MyType'

call qRegisterMetaType() to register the data type before you call QMetaMethod::invoke().

Warning

In addition to the limitations of the variadic invoke() overload, the arguments must have the same type as the ones expected by the method, else, the behavior is undefined.

See also

Q_ARG() Q_RETURN_ARG() qRegisterMetaType() invokeMethod()

isConst()#

Return type:: bool

Returns whether the method is const qualified.

Note

This method might erroneously return false for a const method if it belongs to a library compiled against an older version of Qt.

isValid()#

Return type:: bool

Returns true if this method is valid (can be introspected and invoked), otherwise returns false.

methodIndex()#

Return type:: int

Returns this method’s index.

methodSignature()#

Return type:: QByteArray

Returns the signature of this method (e.g., setValue(double)).

See also

parameterTypes() parameterNames()

methodType()#

Return type:: MethodType

Returns the type of this method (signal, slot, or method).

See also

access()

name()#

Return type:: QByteArray

Returns the name of this method.

See also

methodSignature() parameterCount()

__ne__(m2)#

Parameters:: m2 – QMetaMethod
Return type:: bool

This is an overloaded function.

Returns true if method m1 is not equal to method m2, otherwise returns false.

__eq__(m2)#

Parameters:: m2 – QMetaMethod
Return type:: bool

This is an overloaded function.

Returns true if method m1 is equal to method m2, otherwise returns false.

parameterCount()#

Return type:: int

Returns the number of parameters of this method.

See also

parameterType() parameterNames()

parameterMetaType(index)#

Parameters:: index – int
Return type:: QMetaType

Returns the metatype of the parameter at the given index.

If the index is smaller than zero or larger than parameterCount() , an invalid QMetaType is returned.

See also

parameterCount() returnMetaType() QMetaType

parameterNames()#

Return type:: .list of QByteArray

Returns a list of parameter names.

See also

parameterTypes() methodSignature()

parameterType(index)#

Parameters:: index – int
Return type:: int

Returns the type of the parameter at the given index.

The return value is one of the types that are registered with QMetaType , or UnknownType if the type is not registered.

See also

parameterCount() parameterMetaType() returnType() QMetaType

parameterTypeName(index)#

Parameters:: index – int
Return type:: QByteArray

Returns the name of the type at position index If there is no parameter at index, returns an empty QByteArray

See also

parameterNames()

parameterTypes()#

Return type:: .list of QByteArray

Returns a list of parameter types.

See also

parameterNames() methodSignature()

relativeMethodIndex()#

Return type:: int

Returns this method’s local index inside.

returnMetaType()#

Return type:: QMetaType

Returns the return type of this method.

See also

parameterMetaType() QMetaType typeName()

returnType()#

Return type:: int

Returns the return type of this method.

The return value is one of the types that are registered with QMetaType , or UnknownType if the type is not registered.

See also

parameterType() QMetaType typeName() returnMetaType()

revision()#

Return type:: int

Returns the method revision if one was specified by Q_REVISION , otherwise returns 0.

tag()#

Return type:: str

Warning

This section contains snippets that were automatically translated from C++ to Python and may contain errors.

Returns the tag associated with this method.

Tags are special macros recognized by moc that make it possible to add extra information about a method.

Tag information can be added in the following way in the function declaration:

    # In the class MainWindow declaration
    #ifndef Q_MOC_RUN
    # define the tag text as empty, so the compiler doesn't see it
    # define MY_CUSTOM_TAG
    #endif
    ...
#     private slots
        MY_CUSTOM_TAG void testFunc()

and the information can be accessed by using:

win = MainWindow()
win.show()
functionIndex = win.metaObject().indexOfSlot("testFunc()")
mm = win.metaObject().method(functionIndex)
print(mm.tag()) # prints MY_CUSTOM_TAG

For the moment, moc will extract and record all tags, but it will not handle any of them specially. You can use the tags to annotate your methods differently, and treat them according to the specific needs of your application.

Note

moc expands preprocessor macros, so it is necessary to surround the definition with #ifndef Q_MOC_RUN, as shown in the example above.

typeName()#

Return type:: str

Returns the return type name of this method.

See also

returnType() type()