diff options
Diffstat (limited to 'doc/classes/Signal.xml')
| -rw-r--r-- | doc/classes/Signal.xml | 40 |
1 files changed, 32 insertions, 8 deletions
diff --git a/doc/classes/Signal.xml b/doc/classes/Signal.xml index d99477ee95..3412cd2140 100644 --- a/doc/classes/Signal.xml +++ b/doc/classes/Signal.xml @@ -1,9 +1,29 @@ <?xml version="1.0" encoding="UTF-8" ?> <class name="Signal" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd"> <brief_description> - Class representing a signal defined in an object. + Built-in type representing a signal defined in an object. </brief_description> <description> + [Signal] is a built-in [Variant] type that represents a signal of an [Object] instance. Like all [Variant] types, it can be stored in variables and passed to functions. Signals allow all connected [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. + In GDScript, signals can be declared with the [code]signal[/code] keyword. In C#, you may use the [code][Signal][/code] attribute on a delegate. + [codeblocks] + [gdscript] + signal attacked + + # Additional arguments may be declared. + # These arguments must be passed when the signal is emitted. + signal item_dropped(item_name, amount) + [/gdscript] + [csharp] + [Signal] + delegate void Attacked(); + + // Additional arguments may be declared. + // These arguments must be passed when the signal is emitted. + [Signal] + delegate void ItemDropped(itemName: string, amount: int); + [/csharp] + [/codeblocks] </description> <tutorials> <link title="Using Signals">$DOCS_URL/getting_started/step_by_step/signals.html</link> @@ -13,7 +33,7 @@ <constructor name="Signal"> <return type="Signal" /> <description> - Constructs a null [Signal] with no object nor signal name bound. + Constructs an empty [Signal] with no object nor signal name bound. </description> </constructor> <constructor name="Signal"> @@ -28,7 +48,7 @@ <param index="0" name="object" type="Object" /> <param index="1" name="signal" type="StringName" /> <description> - Creates a new [Signal] with the name [param signal] in the specified [param object]. + Creates a new [Signal] named [param signal] in the specified [param object]. </description> </constructor> </constructors> @@ -38,12 +58,13 @@ <param index="0" name="callable" type="Callable" /> <param index="1" name="flags" type="int" default="0" /> <description> - Connects this signal to the specified [Callable], optionally providing connection flags. You can provide additional arguments to the connected method call by using [method Callable.bind]. + Connects this signal to the specified [param callable]. Optional [param flags] can be also added to configure the connection's behavior (see [enum Object.ConnectFlags] constants). You can provide additional arguments to the connected [param callable] by using [method Callable.bind]. + A signal can only be connected once to the same [Callable]. If the signal is already connected, returns [constant ERR_INVALID_PARAMETER] and pushes an error message, unless the signal is connected with [constant Object.CONNECT_REFERENCE_COUNTED]. To prevent this, use [method is_connected] first to check for existing connections. [codeblock] for button in $Buttons.get_children(): - button.pressed.connect(on_pressed.bind(button)) + button.pressed.connect(_on_pressed.bind(button)) - func on_pressed(button): + func _on_pressed(button): print(button.name, " was pressed") [/codeblock] </description> @@ -52,13 +73,13 @@ <return type="void" /> <param index="0" name="callable" type="Callable" /> <description> - Disconnects this signal from the specified [Callable]. + Disconnects this signal from the specified [Callable]. If the connection does not exist, generates an error. Use [method is_connected] to make sure that the connection exists. </description> </method> <method name="emit" qualifiers="vararg const"> <return type="void" /> <description> - Emits this signal to all connected objects. + Emits this signal. All [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. </description> </method> <method name="get_connections" qualifiers="const"> @@ -95,6 +116,7 @@ <method name="is_null" qualifiers="const"> <return type="bool" /> <description> + Returns [code]true[/code] if the signal's name does not exist in its object, or the object is not valid. </description> </method> </methods> @@ -103,12 +125,14 @@ <return type="bool" /> <param index="0" name="right" type="Signal" /> <description> + Returns [code]true[/code] if the signals do not share the same object and name. </description> </operator> <operator name="operator =="> <return type="bool" /> <param index="0" name="right" type="Signal" /> <description> + Returns [code]true[/code] if both signals share the same object and name. </description> </operator> </operators> |