This class is in charge of the application's event-dispatch loop. More...

Classes
class	MessageBase
	Internal class used as the base class for all message objects. More...
Public Member Functions
void	runDispatchLoop ()
	Runs the event dispatch loop until a stop message is posted.
void	stopDispatchLoop ()
	Sends a signal that the dispatch loop should terminate.
bool	hasStopMessageBeenSent () const noexcept
	Returns true if the stopDispatchLoop() method has been called.
void *	callFunctionOnMessageThread (MessageCallbackFunction callback, void userData)
	Calls a function using the message-thread.
bool	isThisTheMessageThread () const noexcept
	Returns true if the caller-thread is the message thread.
void	setCurrentThreadAsMessageThread ()
	Called to tell the manager that the current thread is the one that's running the dispatch loop.
Thread::ThreadID	getCurrentMessageThread () const noexcept
	Returns the ID of the current message thread, as set by setCurrentThreadAsMessageThread().
bool	currentThreadHasLockedMessageManager () const noexcept
	Returns true if the caller thread has currenltly got the message manager locked.
void	registerBroadcastListener (ActionListener *listener)
	Registers a listener to get told about broadcast messages.
void	deregisterBroadcastListener (ActionListener *listener)
	Deregisters a broadcast listener.
Static Public Member Functions
static MessageManager *	getInstance ()
	Returns the global instance of the MessageManager.
static MessageManager *	getInstanceWithoutCreating () noexcept
	Returns the global instance of the MessageManager, or nullptr if it doesn't exist.
static void	deleteInstance ()
	Deletes the global MessageManager instance.
static void	broadcastMessage (const String &messageText)
	Sends a message to all other JUCE applications that are running.

Detailed Description

This class is in charge of the application's event-dispatch loop.

See also:: Message, CallbackMessage, MessageManagerLock, JUCEApplication

Member Function Documentation

static MessageManager* MessageManager::getInstance ( ) [static]

Returns the global instance of the MessageManager.

static MessageManager* MessageManager::getInstanceWithoutCreating ( ) [static]

Returns the global instance of the MessageManager, or nullptr if it doesn't exist.

static void MessageManager::deleteInstance ( ) [static]

Deletes the global MessageManager instance.

Does nothing if no instance had been created.

void MessageManager::runDispatchLoop ( )

Runs the event dispatch loop until a stop message is posted.

This method is only intended to be run by the application's startup routine, as it blocks, and will only return after the stopDispatchLoop() method has been used.

See also:: stopDispatchLoop

void MessageManager::stopDispatchLoop ( )

Sends a signal that the dispatch loop should terminate.

After this is called, the runDispatchLoop() or runDispatchLoopUntil() methods will be interrupted and will return.

See also:: runDispatchLoop

bool MessageManager::hasStopMessageBeenSent ( ) const

Returns true if the stopDispatchLoop() method has been called.

void* MessageManager::callFunctionOnMessageThread	(	MessageCallbackFunction *	callback,
		void *	userData
	)

Calls a function using the message-thread.

This can be used by any thread to cause this function to be called-back by the message thread. If it's the message-thread that's calling this method, then the function will just be called; if another thread is calling, a message will be posted to the queue, and this method will block until that message is delivered, the function is called, and the result is returned.

Be careful not to cause any deadlocks with this! It's easy to do - e.g. if the caller thread has a critical section locked, which an unrelated message callback then tries to lock before the message thread gets round to processing this callback.

Parameters:

callback	the function to call - its signature must be void* myCallbackFunction (void*)
userData	a user-defined pointer that will be passed to the function that gets called

Returns:: the value that the callback function returns.

See also:: MessageManagerLock

bool MessageManager::isThisTheMessageThread ( ) const

Returns true if the caller-thread is the message thread.

void MessageManager::setCurrentThreadAsMessageThread ( )

Called to tell the manager that the current thread is the one that's running the dispatch loop.

(Best to ignore this method unless you really know what you're doing..)

See also:: getCurrentMessageThread

Thread::ThreadID MessageManager::getCurrentMessageThread ( ) const

Returns the ID of the current message thread, as set by setCurrentThreadAsMessageThread().

(Best to ignore this method unless you really know what you're doing..)

See also:: setCurrentThreadAsMessageThread

bool MessageManager::currentThreadHasLockedMessageManager ( ) const

Returns true if the caller thread has currenltly got the message manager locked.

see the MessageManagerLock class for more info about this.

This will be true if the caller is the message thread, because that automatically gains a lock while a message is being dispatched.

static void MessageManager::broadcastMessage ( const String & messageText ) [static]

Sends a message to all other JUCE applications that are running.

Parameters:

messageText the string that will be passed to the actionListenerCallback() method of the broadcast listeners in the other app.

See also:: registerBroadcastListener, ActionListener

void MessageManager::registerBroadcastListener ( ActionListener * listener )

Registers a listener to get told about broadcast messages.

The actionListenerCallback() callback's string parameter is the message passed into broadcastMessage().

See also:: broadcastMessage

void MessageManager::deregisterBroadcastListener ( ActionListener * listener )

Deregisters a broadcast listener.

The documentation for this class was generated from the following file:

juce_MessageManager.h

Classes

Public Member Functions

Static Public Member Functions

Detailed Description

Member Function Documentation