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315 lines
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ReStructuredText
315 lines
13 KiB
ReStructuredText
:github_url: hide
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.. DO NOT EDIT THIS FILE!!!
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.. Generated automatically from Godot engine sources.
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.. Generator: https://github.com/godotengine/godot/tree/master/doc/tools/make_rst.py.
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.. XML source: https://github.com/godotengine/godot/tree/master/doc/classes/Signal.xml.
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.. _class_Signal:
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Signal
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======
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Built-in type representing a signal defined in an object.
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.. rst-class:: classref-introduction-group
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Description
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-----------
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**Signal** is a built-in :ref:`Variant<class_Variant>` type that represents a signal of an :ref:`Object<class_Object>` instance. Like all :ref:`Variant<class_Variant>` types, it can be stored in variables and passed to functions. Signals allow all connected :ref:`Callable<class_Callable>`\ s (and by extension their respective objects) to listen and react to events, without directly referencing one another. This keeps the code flexible and easier to manage.
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In GDScript, signals can be declared with the ``signal`` keyword. In C#, you may use the ``[Signal]`` attribute on a delegate.
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.. tabs::
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.. code-tab:: gdscript
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signal attacked
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# Additional arguments may be declared.
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# These arguments must be passed when the signal is emitted.
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signal item_dropped(item_name, amount)
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.. code-tab:: csharp
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[Signal]
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delegate void AttackedEventHandler();
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// Additional arguments may be declared.
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// These arguments must be passed when the signal is emitted.
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[Signal]
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delegate void ItemDroppedEventHandler(string itemName, int amount);
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.. rst-class:: classref-introduction-group
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Tutorials
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---------
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- :doc:`Using Signals <../getting_started/step_by_step/signals>`
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- `GDScript Basics <../tutorials/scripting/gdscript/gdscript_basics.html#signals>`__
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.. rst-class:: classref-reftable-group
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Constructors
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------------
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.. table::
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:widths: auto
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+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Signal<class_Signal>` | :ref:`Signal<class_Signal_constructor_Signal>` **(** **)** |
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+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Signal<class_Signal>` | :ref:`Signal<class_Signal_constructor_Signal>` **(** :ref:`Signal<class_Signal>` from **)** |
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+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Signal<class_Signal>` | :ref:`Signal<class_Signal_constructor_Signal>` **(** :ref:`Object<class_Object>` object, :ref:`StringName<class_StringName>` signal **)** |
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+-----------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+
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.. rst-class:: classref-reftable-group
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Methods
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-------
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.. table::
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:widths: auto
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`int<class_int>` | :ref:`connect<class_Signal_method_connect>` **(** :ref:`Callable<class_Callable>` callable, :ref:`int<class_int>` flags=0 **)** |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| void | :ref:`disconnect<class_Signal_method_disconnect>` **(** :ref:`Callable<class_Callable>` callable **)** |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| void | :ref:`emit<class_Signal_method_emit>` **(** ... **)** |vararg| |const| |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Array<class_Array>` | :ref:`get_connections<class_Signal_method_get_connections>` **(** **)** |const| |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`StringName<class_StringName>` | :ref:`get_name<class_Signal_method_get_name>` **(** **)** |const| |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Object<class_Object>` | :ref:`get_object<class_Signal_method_get_object>` **(** **)** |const| |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`int<class_int>` | :ref:`get_object_id<class_Signal_method_get_object_id>` **(** **)** |const| |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`is_connected<class_Signal_method_is_connected>` **(** :ref:`Callable<class_Callable>` callable **)** |const| |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`is_null<class_Signal_method_is_null>` **(** **)** |const| |
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+-------------------------------------+---------------------------------------------------------------------------------------------------------------------------------+
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.. rst-class:: classref-reftable-group
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Operators
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---------
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.. table::
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:widths: auto
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+-------------------------+----------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`operator !=<class_Signal_operator_neq_Signal>` **(** :ref:`Signal<class_Signal>` right **)** |
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+-------------------------+----------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`operator ==<class_Signal_operator_eq_Signal>` **(** :ref:`Signal<class_Signal>` right **)** |
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+-------------------------+----------------------------------------------------------------------------------------------------+
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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Constructor Descriptions
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------------------------
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.. _class_Signal_constructor_Signal:
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.. rst-class:: classref-constructor
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:ref:`Signal<class_Signal>` **Signal** **(** **)**
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Constructs an empty **Signal** with no object nor signal name bound.
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.. rst-class:: classref-item-separator
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----
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.. rst-class:: classref-constructor
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:ref:`Signal<class_Signal>` **Signal** **(** :ref:`Signal<class_Signal>` from **)**
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Constructs a **Signal** as a copy of the given **Signal**.
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.. rst-class:: classref-item-separator
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----
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.. rst-class:: classref-constructor
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:ref:`Signal<class_Signal>` **Signal** **(** :ref:`Object<class_Object>` object, :ref:`StringName<class_StringName>` signal **)**
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Creates a new **Signal** named ``signal`` in the specified ``object``.
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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Method Descriptions
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-------------------
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.. _class_Signal_method_connect:
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.. rst-class:: classref-method
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:ref:`int<class_int>` **connect** **(** :ref:`Callable<class_Callable>` callable, :ref:`int<class_int>` flags=0 **)**
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Connects this signal to the specified ``callable``. Optional ``flags`` can be also added to configure the connection's behavior (see :ref:`ConnectFlags<enum_Object_ConnectFlags>` constants). You can provide additional arguments to the connected ``callable`` by using :ref:`Callable.bind<class_Callable_method_bind>`.
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A signal can only be connected once to the same :ref:`Callable<class_Callable>`. If the signal is already connected, returns :ref:`@GlobalScope.ERR_INVALID_PARAMETER<class_@GlobalScope_constant_ERR_INVALID_PARAMETER>` and pushes an error message, unless the signal is connected with :ref:`Object.CONNECT_REFERENCE_COUNTED<class_Object_constant_CONNECT_REFERENCE_COUNTED>`. To prevent this, use :ref:`is_connected<class_Signal_method_is_connected>` first to check for existing connections.
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::
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for button in $Buttons.get_children():
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button.pressed.connect(_on_pressed.bind(button))
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func _on_pressed(button):
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print(button.name, " was pressed")
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_disconnect:
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.. rst-class:: classref-method
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void **disconnect** **(** :ref:`Callable<class_Callable>` callable **)**
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Disconnects this signal from the specified :ref:`Callable<class_Callable>`. If the connection does not exist, generates an error. Use :ref:`is_connected<class_Signal_method_is_connected>` to make sure that the connection exists.
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_emit:
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.. rst-class:: classref-method
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void **emit** **(** ... **)** |vararg| |const|
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Emits this signal. All :ref:`Callable<class_Callable>`\ s connected to this signal will be triggered. This method supports a variable number of arguments, so parameters can be passed as a comma separated list.
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_get_connections:
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.. rst-class:: classref-method
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:ref:`Array<class_Array>` **get_connections** **(** **)** |const|
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Returns an :ref:`Array<class_Array>` of connections for this signal. Each connection is represented as a :ref:`Dictionary<class_Dictionary>` that contains three entries:
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- ``signal`` is a reference to this signal;
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- ``callable`` is a reference to the connected :ref:`Callable<class_Callable>`;
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- ``flags`` is a combination of :ref:`ConnectFlags<enum_Object_ConnectFlags>`.
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_get_name:
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.. rst-class:: classref-method
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:ref:`StringName<class_StringName>` **get_name** **(** **)** |const|
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Returns the name of this signal.
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_get_object:
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.. rst-class:: classref-method
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:ref:`Object<class_Object>` **get_object** **(** **)** |const|
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Returns the object emitting this signal.
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_get_object_id:
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.. rst-class:: classref-method
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:ref:`int<class_int>` **get_object_id** **(** **)** |const|
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Returns the ID of the object emitting this signal (see :ref:`Object.get_instance_id<class_Object_method_get_instance_id>`).
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_is_connected:
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.. rst-class:: classref-method
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:ref:`bool<class_bool>` **is_connected** **(** :ref:`Callable<class_Callable>` callable **)** |const|
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Returns ``true`` if the specified :ref:`Callable<class_Callable>` is connected to this signal.
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_method_is_null:
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.. rst-class:: classref-method
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:ref:`bool<class_bool>` **is_null** **(** **)** |const|
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Returns ``true`` if the signal's name does not exist in its object, or the object is not valid.
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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Operator Descriptions
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---------------------
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.. _class_Signal_operator_neq_Signal:
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.. rst-class:: classref-operator
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:ref:`bool<class_bool>` **operator !=** **(** :ref:`Signal<class_Signal>` right **)**
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Returns ``true`` if the signals do not share the same object and name.
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.. rst-class:: classref-item-separator
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----
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.. _class_Signal_operator_eq_Signal:
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.. rst-class:: classref-operator
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:ref:`bool<class_bool>` **operator ==** **(** :ref:`Signal<class_Signal>` right **)**
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Returns ``true`` if both signals share the same object and name.
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.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
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.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
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.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
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.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
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.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
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.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`
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