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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
|
<?xml version="1.0" encoding="UTF-8" ?>
<class name="UndoRedo" inherits="Object" version="4.0">
<brief_description>
Helper to manage undo/redo operations in the editor or custom tools.
</brief_description>
<description>
Helper to manage undo/redo operations in the editor or custom tools. It works by registering methods and property changes inside "actions".
Common behavior is to create an action, then add do/undo calls to functions or property changes, then committing the action.
Here's an example on how to add an action to the Godot editor's own [UndoRedo], from a plugin:
[codeblock]
var undo_redo = get_undo_redo() # Method of EditorPlugin.
func do_something():
pass # Put your code here.
func undo_something():
pass # Put here the code that reverts what's done by "do_something()".
func _on_MyButton_pressed():
var node = get_node("MyNode2D")
undo_redo.create_action("Move the node")
undo_redo.add_do_method(self, "do_something")
undo_redo.add_undo_method(self, "undo_something")
undo_redo.add_do_property(node, "position", Vector2(100,100))
undo_redo.add_undo_property(node, "position", node.position)
undo_redo.commit_action()
[/codeblock]
[method create_action], [method add_do_method], [method add_undo_method], [method add_do_property], [method add_undo_property], and [method commit_action] should be called one after the other, like in the example. Not doing so could lead to crashes.
If you don't need to register a method, you can leave [method add_do_method] and [method add_undo_method] out; the same goes for properties. You can also register more than one method/property.
</description>
<tutorials>
</tutorials>
<methods>
<method name="add_do_method" qualifiers="vararg">
<return type="void">
</return>
<argument index="0" name="object" type="Object">
</argument>
<argument index="1" name="method" type="StringName">
</argument>
<description>
Register a method that will be called when the action is committed.
</description>
</method>
<method name="add_do_property">
<return type="void">
</return>
<argument index="0" name="object" type="Object">
</argument>
<argument index="1" name="property" type="StringName">
</argument>
<argument index="2" name="value" type="Variant">
</argument>
<description>
Register a property value change for "do".
</description>
</method>
<method name="add_do_reference">
<return type="void">
</return>
<argument index="0" name="object" type="Object">
</argument>
<description>
Register a reference for "do" that will be erased if the "do" history is lost. This is useful mostly for new nodes created for the "do" call. Do not use for resources.
</description>
</method>
<method name="add_undo_method" qualifiers="vararg">
<return type="void">
</return>
<argument index="0" name="object" type="Object">
</argument>
<argument index="1" name="method" type="StringName">
</argument>
<description>
Register a method that will be called when the action is undone.
</description>
</method>
<method name="add_undo_property">
<return type="void">
</return>
<argument index="0" name="object" type="Object">
</argument>
<argument index="1" name="property" type="StringName">
</argument>
<argument index="2" name="value" type="Variant">
</argument>
<description>
Register a property value change for "undo".
</description>
</method>
<method name="add_undo_reference">
<return type="void">
</return>
<argument index="0" name="object" type="Object">
</argument>
<description>
Register a reference for "undo" that will be erased if the "undo" history is lost. This is useful mostly for nodes removed with the "do" call (not the "undo" call!).
</description>
</method>
<method name="clear_history">
<return type="void">
</return>
<argument index="0" name="increase_version" type="bool" default="true">
</argument>
<description>
Clear the undo/redo history and associated references.
Passing [code]false[/code] to [code]increase_version[/code] will prevent the version number to be increased from this.
</description>
</method>
<method name="commit_action">
<return type="void">
</return>
<argument index="0" name="execute" type="bool" default="true">
</argument>
<description>
Commit the action. If [code]execute[/code] is true (default), all "do" methods/properties are called/set when this function is called.
</description>
</method>
<method name="create_action">
<return type="void">
</return>
<argument index="0" name="name" type="String">
</argument>
<argument index="1" name="merge_mode" type="int" enum="UndoRedo.MergeMode" default="0">
</argument>
<description>
Create a new action. After this is called, do all your calls to [method add_do_method], [method add_undo_method], [method add_do_property], and [method add_undo_property], then commit the action with [method commit_action].
The way actions are merged is dictated by the [code]merge_mode[/code] argument. See [enum MergeMode] for details.
</description>
</method>
<method name="get_action_name">
<return type="String">
</return>
<argument index="0" name="id" type="int">
</argument>
<description>
Gets the action name from its index.
</description>
</method>
<method name="get_current_action">
<return type="int">
</return>
<description>
Gets the index of the current action.
</description>
</method>
<method name="get_current_action_name" qualifiers="const">
<return type="String">
</return>
<description>
Gets the name of the current action, equivalent to [code]get_action_name(get_current_action())[/code].
</description>
</method>
<method name="get_history_count">
<return type="int">
</return>
<description>
Return how many element are in the history.
</description>
</method>
<method name="get_version" qualifiers="const">
<return type="int">
</return>
<description>
Gets the version. Every time a new action is committed, the [UndoRedo]'s version number is increased automatically.
This is useful mostly to check if something changed from a saved version.
</description>
</method>
<method name="has_redo">
<return type="bool">
</return>
<description>
Returns [code]true[/code] if a "redo" action is available.
</description>
</method>
<method name="has_undo">
<return type="bool">
</return>
<description>
Returns [code]true[/code] if an "undo" action is available.
</description>
</method>
<method name="is_committing_action" qualifiers="const">
<return type="bool">
</return>
<description>
Returns [code]true[/code] if the [UndoRedo] is currently committing the action, i.e. running its "do" method or property change (see [method commit_action]).
</description>
</method>
<method name="redo">
<return type="bool">
</return>
<description>
Redo the last action.
</description>
</method>
<method name="undo">
<return type="bool">
</return>
<description>
Undo the last action.
</description>
</method>
</methods>
<signals>
<signal name="version_changed">
<description>
Called when [method undo] or [method redo] was called.
</description>
</signal>
</signals>
<constants>
<constant name="MERGE_DISABLE" value="0" enum="MergeMode">
Makes "do"/"undo" operations stay in separate actions.
</constant>
<constant name="MERGE_ENDS" value="1" enum="MergeMode">
Makes so that the action's "do" operation is from the first action created and the "undo" operation is from the last subsequent action with the same name.
</constant>
<constant name="MERGE_ALL" value="2" enum="MergeMode">
Makes subsequent actions with the same name be merged into one.
</constant>
</constants>
</class>
|