1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
<?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.
</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.
[b]Example:[/b]
[codeblocks]
[gdscript]
func print_args(arg1, arg2, arg3 = ""):
prints(arg1, arg2, arg3)
func test():
var callable = Callable(self, "print_args")
callable.call("hello", "world") # Prints "hello world ".
callable.call(Vector2.UP, 42, callable) # Prints "(0, -1) 42 Node(Node.gd)::print_args".
callable.call("invalid") # Invalid call, should have at least 2 arguments.
[/gdscript]
[csharp]
public void PrintArgs(object arg1, object arg2, object arg3 = null)
{
GD.PrintS(arg1, arg2, arg3);
}
public void Test()
{
Callable callable = new Callable(this, nameof(PrintArgs));
callable.Call("hello", "world"); // Prints "hello world null".
callable.Call(Vector2.Up, 42, callable); // Prints "(0, -1) 42 Node(Node.cs)::PrintArgs".
callable.Call("invalid"); // Invalid call, should have at least 2 arguments.
}
[/csharp]
[/codeblocks]
</description>
<tutorials>
</tutorials>
<constructors>
<constructor name="Callable">
<return type="Callable" />
<description>
Constructs a null [Callable] with no object nor method bound.
</description>
</constructor>
<constructor name="Callable">
<return type="Callable" />
<param index="0" name="from" type="Callable" />
<description>
Constructs a [Callable] as a copy of the given [Callable].
</description>
</constructor>
<constructor name="Callable">
<return type="Callable" />
<param index="0" name="object" type="Object" />
<param index="1" name="method" type="StringName" />
<description>
Creates a new [Callable] for the method called [code]method[/code] in the specified [code]object[/code].
</description>
</constructor>
</constructors>
<methods>
<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].
</description>
</method>
<method name="call" qualifiers="vararg const">
<return type="Variant" />
<description>
Calls the method represented by this [Callable]. Arguments can be passed and should match the method's signature.
</description>
</method>
<method name="call_deferred" qualifiers="vararg const">
<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.
</description>
</method>
<method name="get_method" qualifiers="const">
<return type="StringName" />
<description>
Returns the name of the method represented by this [Callable].
</description>
</method>
<method name="get_object" qualifiers="const">
<return type="Object" />
<description>
Returns the object on which this [Callable] is called.
</description>
</method>
<method name="get_object_id" qualifiers="const">
<return type="int" />
<description>
Returns the ID of this [Callable]'s object (see [method Object.get_instance_id]).
</description>
</method>
<method name="hash" qualifiers="const">
<return type="int" />
<description>
Returns the 32-bit hash value of this [Callable]'s object.
[b]Note:[/b] [Callable]s with equal content will always produce identical hash values. However, the reverse is not true. Returning identical hash values does [i]not[/i] imply the callables are equal, because different callables can have identical hash values due to hash collisions. The engine uses a 32-bit hash algorithm for [method hash].
</description>
</method>
<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].
</description>
</method>
<method name="is_null" qualifiers="const">
<return type="bool" />
<description>
Returns [code]true[/code] if this [Callable] has no target to call the method on.
</description>
</method>
<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].
</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.
</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.
</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.
</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.
</description>
</method>
</methods>
<operators>
<operator name="operator !=">
<return type="bool" />
<param index="0" name="right" type="Callable" />
<description>
Returns [code]true[/code] if both [Callable]s invoke different targets.
</description>
</operator>
<operator name="operator ==">
<return type="bool" />
<param index="0" name="right" type="Callable" />
<description>
Returns [code]true[/code] if both [Callable]s invoke the same custom target.
</description>
</operator>
</operators>
</class>
|