diff options
Diffstat (limited to 'doc/classes/Callable.xml')
| -rw-r--r-- | doc/classes/Callable.xml | 47 |
1 files changed, 35 insertions, 12 deletions
diff --git a/doc/classes/Callable.xml b/doc/classes/Callable.xml index 6838bdeb70..1fb4f91920 100644 --- a/doc/classes/Callable.xml +++ b/doc/classes/Callable.xml @@ -1,10 +1,10 @@ <?xml version="1.0" encoding="UTF-8" ?> <class name="Callable" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd"> <brief_description> - An object representing a method in a certain object that can be called. + Built-in type representing a method in an object instance or a standalone function. </brief_description> <description> - [Callable] is a first class object which can be held in variables and passed to functions. It represents a given method in an [Object], and is typically used for signal callbacks. + [Callable] is a built-in [Variant] type that represents a function. It can either be a method within an [Object] instance, or a standalone function not related to any object, like a lambda function. Like all [Variant] types, it can be stored in variables and passed to other functions. It is most commonly used for signal callbacks. [b]Example:[/b] [codeblocks] [gdscript] @@ -32,6 +32,18 @@ } [/csharp] [/codeblocks] + In GDScript, it's possible to create lambda functions within a method. Lambda functions are custom callables that are not associated with an [Object] instance. Optionally, lambda functions can also be named. The name will be displayed in the debugger, or when calling [method get_method]. + [codeblock] + func _init(): + var my_lambda = func (message): + print(message) + + # Prints Hello everyone! + my_lambda.call("Hello everyone!") + + # Prints "Attack!", when the button_pressed signal is emitted. + button_pressed.connect(func(): print("Attack!")) + [/codeblock] </description> <tutorials> </tutorials> @@ -39,7 +51,7 @@ <constructor name="Callable"> <return type="Callable" /> <description> - Constructs a null [Callable] with no object nor method bound. + Constructs an empty [Callable], with no object nor method bound. </description> </constructor> <constructor name="Callable"> @@ -54,7 +66,7 @@ <param index="0" name="object" type="Object" /> <param index="1" name="method" type="StringName" /> <description> - Creates a new [Callable] for the method called [param method] in the specified [param object]. + Creates a new [Callable] for the method named [param method] in the specified [param object]. </description> </constructor> </constructors> @@ -62,7 +74,7 @@ <method name="bind" qualifiers="vararg const"> <return type="Callable" /> <description> - Returns a copy of this [Callable] with the arguments bound. Bound arguments are passed after the arguments supplied by [method call]. + Returns a copy of this [Callable] with one or more arguments bound. When called, the bound arguments are passed [i]after[/i] the arguments supplied by [method call]. </description> </method> <method name="call" qualifiers="vararg const"> @@ -75,12 +87,23 @@ <return type="void" /> <description> Calls the method represented by this [Callable] in deferred mode, i.e. during the idle frame. Arguments can be passed and should match the method's signature. + [codeblock] + func _ready(): + grab_focus.call_deferred() + [/codeblock] + </description> + </method> + <method name="callv" qualifiers="const"> + <return type="Variant" /> + <param index="0" name="arguments" type="Array" /> + <description> + Calls the method represented by this [Callable]. Unlike [method call], this method expects all arguments to be contained inside the [param arguments] [Array]. </description> </method> <method name="get_method" qualifiers="const"> <return type="StringName" /> <description> - Returns the name of the method represented by this [Callable]. + Returns the name of the method represented by this [Callable]. If the callable is a lambda function, returns the function's name. </description> </method> <method name="get_object" qualifiers="const"> @@ -105,7 +128,7 @@ <method name="is_custom" qualifiers="const"> <return type="bool" /> <description> - Returns [code]true[/code] if this [Callable] is a custom callable whose behavior differs based on implementation details. Custom callables are used in the engine for various reasons. If [code]true[/code], you can't use [method get_method]. + Returns [code]true[/code] if this [Callable] is a custom callable. Custom callables are created from [method bind] or [method unbind]. In GDScript, lambda functions are also custom callables. </description> </method> <method name="is_null" qualifiers="const"> @@ -117,33 +140,33 @@ <method name="is_standard" qualifiers="const"> <return type="bool" /> <description> - Returns [code]true[/code] if this [Callable] is a standard callable, referencing an object and a method using a [StringName]. + Returns [code]true[/code] if this [Callable] is a standard callable. This method is the opposite of [method is_custom]. Returns [code]false[/code] if this callable is a lambda function. </description> </method> <method name="is_valid" qualifiers="const"> <return type="bool" /> <description> - Returns [code]true[/code] if the object exists and has a valid function assigned, or is a custom callable. + Returns [code]true[/code] if the callable's object exists and has a valid method name assigned, or is a custom callable. </description> </method> <method name="rpc" qualifiers="vararg const"> <return type="void" /> <description> - Perform an RPC (Remote Procedure Call). This is used for multiplayer and is normally not available unless the function being called has been marked as [i]RPC[/i]. Calling it on unsupported functions will result in an error. + Perform an RPC (Remote Procedure Call). This is used for multiplayer and is normally not available, unless the function being called has been marked as [i]RPC[/i]. Calling this method on unsupported functions will result in an error. </description> </method> <method name="rpc_id" qualifiers="vararg const"> <return type="void" /> <param index="0" name="peer_id" type="int" /> <description> - Perform an RPC (Remote Procedure Call) on a specific peer ID (see multiplayer documentation for reference). This is used for multiplayer and is normally not available unless the function being called has been marked as [i]RPC[/i]. Calling it on unsupported functions will result in an error. + Perform an RPC (Remote Procedure Call) on a specific peer ID (see multiplayer documentation for reference). This is used for multiplayer and is normally not available unless the function being called has been marked as [i]RPC[/i]. Calling this method on unsupported functions will result in an error. </description> </method> <method name="unbind" qualifiers="const"> <return type="Callable" /> <param index="0" name="argcount" type="int" /> <description> - Returns a copy of this [Callable] with the arguments unbound. Calling the returned [Callable] will call the method without the extra arguments that are supplied in the [Callable] on which you are calling this method. + Returns a copy of this [Callable] with the arguments unbound, as defined by [param argcount]. Calling the returned [Callable] will call the method without the extra arguments that are supplied in the [Callable] on which you are calling this method. </description> </method> </methods> |