These docs are for an outdated version of Phaser The documentation on this page is for Phaser 2.4.6. The latest release is 2.7.7.

Constructor

Phaser. Signal

new Signal()

A Signal is an event dispatch mechanism that supports broadcasting to multiple listeners.

Event listeners are uniquely identified by the listener/callback function and the context.

Source code: core/Signal.js (Line 16)

Public Properties

active : boolean

Is the Signal active? Only active signals will broadcast dispatched events.

Setting this property during a dispatch will only affect the next dispatch. To stop the propagation of a signal from a listener use halt.

Default Value
  • true
Source code: core/Signal.js (Line 57)

memorize : boolean

Memorize the previously dispatched event?

If an event has been memorized it is automatically dispatched when a new listener is added with add or addOnce. Use forget to clear any currently memorized event.

Source code: core/Signal.js (Line 41)

Public Methods

add(listener, listenerContext, priority, args) → {Phaser.SignalBinding}

Add an event listener for this signal.

An event listener is a callback with a related context and priority.

You can optionally provide extra arguments which will be passed to the callback after any internal parameters.

For example: Phaser.Key.onDown when dispatched will send the Phaser.Key object that caused the signal as the first parameter. Any arguments you've specified after priority will be sent as well:

fireButton.onDown.add(shoot, this, 0, 'lazer', 100);

When onDown dispatches it will call the shoot callback passing it: Phaser.Key, 'lazer', 100.

Where the first parameter is the one that Key.onDown dispatches internally and 'lazer', and the value 100 were the custom arguments given in the call to 'add'.

Parameters
Name Type Argument Default Description
listener function

The function to call when this Signal is dispatched.

listenerContext object <optional>

The context under which the listener will be executed (i.e. the object that should represent the this variable).

priority number <optional>

The priority level of the event listener. Listeners with higher priority will be executed before listeners with lower priority. Listeners with same priority level will be executed at the same order as they were added (default = 0)

args any <optional>
<repeatable>
(none)

Additional arguments to pass to the callback (listener) function. They will be appended after any arguments usually dispatched.

Returns

An Object representing the binding between the Signal and listener.

Source code: core/Signal.js (Line 189)

addOnce(listener, listenerContext, priority, args) → {Phaser.SignalBinding}

Add a one-time listener - the listener is automatically removed after the first execution.

If there is as memorized event then it will be dispatched and the listener will be removed immediately.

Parameters
Name Type Argument Default Description
listener function

The function to call when this Signal is dispatched.

listenerContext object <optional>

The context under which the listener will be executed (i.e. the object that should represent the this variable).

priority number <optional>

The priority level of the event listener. Listeners with higher priority will be executed before listeners with lower priority. Listeners with same priority level will be executed at the same order as they were added (default = 0)

args any <optional>
<repeatable>
(none)

Additional arguments to pass to the callback (listener) function. They will be appended after any arguments usually dispatched.

Returns

An Object representing the binding between the Signal and listener.

Source code: core/Signal.js (Line 231)

dispatch(params)

Dispatch / broadcast the event to all listeners.

To create an instance-bound dispatch for this Signal, use boundDispatch.

Parameters
Name Type Argument Description
params any <optional>

Parameters that should be passed to each handler.

Source code: core/Signal.js (Line 352)

dispose()

Dispose the signal - no more events can be dispatched.

This removes all event listeners and clears references to external objects. Calling methods on a disposed objects results in undefined behavior.

Source code: core/Signal.js (Line 408)

forget()

Forget the currently memorized event, if any.

Source code: core/Signal.js (Line 394)

getNumListeners() → {integer}

Gets the total number of listeners attached to this Signal.

Returns
integer -

Number of listeners attached to the Signal.

Source code: core/Signal.js (Line 326)

halt()

Stop propagation of the event, blocking the dispatch to next listener on the queue.

This should be called only during event dispatch as calling it before/after dispatch won't affect another broadcast. See active to enable/disable the signal entirely.

Source code: core/Signal.js (Line 338)

has(listener, context) → {boolean}

Check if a specific listener is attached.

Parameters
Name Type Argument Description
listener function

Signal handler function.

context object <optional>

Context on which listener will be executed (object that should represent the this variable inside listener function).

Returns
boolean -

If Signal has the specified listener.

Source code: core/Signal.js (Line 175)

remove(listener, context) → {function}

Remove a single event listener.

Parameters
Name Type Argument Default Description
listener function

Handler function that should be removed.

context object <optional>
null

Execution context (since you can add the same handler multiple times if executing in a different context).

Returns
function -

Listener handler function.

Source code: core/Signal.js (Line 262)

removeAll(context)

Remove all event listeners.

Parameters
Name Type Argument Default Description
context object <optional>
null

If specified only listeners for the given context will be removed.

Source code: core/Signal.js (Line 286)

toString() → {string}

A string representation of the object.

Returns
string -

String representation of the object.

Source code: core/Signal.js (Line 428)

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