Signal< Args > Class Template Reference

Signal class used for defining a signal and dispatching events. More...

Public Types
enum	{ INVALID_HANDLE = 0 }
using	EventCallback = std::function< void(Args...)>
	Event handler callback function. More...
using	RegisterHandle = uint32_t
	Handle type. More...

Public Member Functions
void	clear ()
	Clear all registered event handlers. More...
void	disable ()
	Disable invoking callbacks. More...
void	enable ()
	Enable invoking callbacks. More...
EGT_NODISCARD bool	enabled () const
	Is callback invoking enabled? More...
void	invoke (Args... args)
	Invoke all handlers with the specified args. More...
RegisterHandle	on_event (const EventCallback &handler)
	Add an event handler to be called when the widget generates an event. More...
RegisterHandle	operator() (const EventCallback &handler)
	Convenience wrapper for on_event(). More...
void	remove (RegisterHandle handle)
	Remove an event handler. More...

Detailed Description

template<typename... Args>
class egt::v1::Signal< Args >

Signal class used for defining a signal and dispatching events.

Member Typedef Documentation

EventCallback

using EventCallback = std::function<void(Args...)>

Event handler callback function.

RegisterHandle

using RegisterHandle = uint32_t

Handle type.

Member Enumeration Documentation

anonymous enum

anonymous enum

Enumerator
INVALID_HANDLE

Member Function Documentation

clear()

void clear ( )

inline

Clear all registered event handlers.

disable()

void disable ( )

inline

Disable invoking callbacks.

enable()

void enable ( )

inline

Enable invoking callbacks.

enabled()

EGT_NODISCARD bool enabled ( ) const

inline

Is callback invoking enabled?

invoke()

void invoke ( Args...  args )

inline

Invoke all handlers with the specified args.

Parameters

args	Arguments for the handler.

on_event()

RegisterHandle on_event ( const EventCallback &  handler )

inline

Add an event handler to be called when the widget generates an event.

Any number of handlers (callbacks) can be registered. Also, the same handler function can be registered multiple times, optionally with different masks.

Parameters

handler

The callback to invoke on event.

Returns

A handle used to identify the registration. This can then be passed to remove_handler().

operator()()

RegisterHandle operator() ( const EventCallback &  handler )

inline

Convenience wrapper for on_event().

remove()

void remove ( RegisterHandle  handle )

inline

Remove an event handler.

Parameters

handle

The handle returned from on_event().