CreateObjcDelegate

Type

handler

Summary

Create an Objective-C object with LCB implementations of methods of a protocol.

Syntax

CreateObjcDelegate(<pProtocol>,<pHandlerMapping>)

Description

Use the CreateObjcDelegate handler to create instances of Objective-C delegate classes with LCB implementations of protocol methods. Once created these can be set in the usual way on an instance of the appropriate class (by binding to -setDelegate:), typically so that callbacks triggered by user interaction with a widget can be handled in LCB.

If any context is required to be passed as a parameter to the callback, use CreateObjcDelegateWithContext.

Some protocols consist of purely optional methods. In this case the information about the protocol's methods are not available from the
objective-c runtime API. In this situation CreateObjcInformalDelegate should be used instead.

Parameters

Name	Type	Description
pProtocol		The name of the protocol
pHandlerMapping		A mapping from the protocol's selector names to LCB handlers

Examples

handler ControlIsValidObjectCallback(in pControl as ObjcId, in pObject as ObjcId) returns CSChar
    return 1
end handler

public handler GetNSControlTextEditingDelegate() returns ObjcObject
    return CreateObjcDelegate("NSControlTextEditingDelegate", \
                              { "control:isValidObject:": \
                                ControlIsValidObjectCallback })
end handler

Related

handler: CreateObjcDelegateWithContext, CreateObjcInformalDelegate, CreateObjcInformalDelegateWithContext