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Handler.h File Reference

Provides the BHandler class. More...

Namespaces
namespace	BPrivate
Classes
class	BHandler
	Handles messages that are passed on by a BLooper. More...
Defines
#define	B_OBSERVE_ORIGINAL_WHAT   "be:observe_orig_what"
	Constant for a message data field in observer messages.
#define	B_OBSERVE_WHAT_CHANGE   "be:observe_change_what"
	Internal.
Variables
const uint32	B_OBSERVER_OBSERVE_ALL = 0xffffffff
	Parameter to BHandler::StartWatching().

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Detailed Description

Provides the BHandler class.

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Define Documentation

#define B_OBSERVE_ORIGINAL_WHAT   "be:observe_orig_what"

Constant for a message data field in observer messages.

If you have called one of the flavors of BHandler::StartWachting(), and you receive a notification, sometimes there can be send a BMessage to go with that notification. The message you receive is a copy of that message, but with the what constant set to B_OBSERVER_NOTICE_CHANGE. The original what constant of the transmitted data message is stored behind the label defined by this constant.

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Variable Documentation

B_OBSERVER_OBSERVE_ALL = 0xffffffff

Parameter to BHandler::StartWatching().

Note:

Specifying this parameter as the what value, leads to the same results as calling BHandler::StartWatchingAll().

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The Haiku Book pre-R1 - Handler.h File Reference
Generated on 14 Feb 2008