176 lines
8.5 KiB
ReStructuredText
176 lines
8.5 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/4.2/doc/tools/make_rst.py.
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.. XML source: https://github.com/godotengine/godot/tree/4.2/modules/limboai/doc_classes/Blackboard.xml.
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.. _class_Blackboard:
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Blackboard
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==========
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**Inherits:**
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A key/value storage for sharing among :ref:`LimboHSM<class_LimboHSM>` states and :ref:`BehaviorTree<class_BehaviorTree>` tasks.
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.. rst-class:: classref-introduction-group
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Description
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-----------
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Blackboard is where data is stored and shared between states in the :ref:`LimboHSM<class_LimboHSM>` system and tasks in a :ref:`BehaviorTree<class_BehaviorTree>`. Each state and task in the :ref:`BehaviorTree<class_BehaviorTree>` can access this Blackboard, allowing them to read and write data. This makes it easy to share information between different actions and behaviors.
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Blackboard can also act as a parent scope for another Blackboard. If a specific variable is not found in the active scope, it looks in the parent Blackboard to find it. A parent Blackboard can itself have its own parent scope, forming what we call a "blackboard scope chain." Importantly, there is no limit to how many Blackboards can be in this chain, and the Blackboard doesn't modify values in the parent scopes.
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New scopes can be created using the :ref:`BTNewScope<class_BTNewScope>` and :ref:`BTSubtree<class_BTSubtree>` decorators. Additionally, a new scope is automatically created for any :ref:`LimboState<class_LimboState>` that has defined non-empty Blackboard data or for any root-level :ref:`LimboHSM<class_LimboHSM>` node.
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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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| void | :ref:`bind_var_to_property<class_Blackboard_method_bind_var_to_property>` **(** StringName var_name, Object object, StringName property **)** |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| void | :ref:`erase_var<class_Blackboard_method_erase_var>` **(** StringName var_name **)** |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Blackboard<class_Blackboard>` | :ref:`get_parent<class_Blackboard_method_get_parent>` **(** **)** |const| |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| Variant | :ref:`get_var<class_Blackboard_method_get_var>` **(** StringName var_name, Variant default=null, bool complain=true **)** |const| |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| bool | :ref:`has_var<class_Blackboard_method_has_var>` **(** StringName var_name **)** |const| |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| void | :ref:`set_parent<class_Blackboard_method_set_parent>` **(** :ref:`Blackboard<class_Blackboard>` blackboard **)** |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| void | :ref:`set_var<class_Blackboard_method_set_var>` **(** StringName var_name, Variant value **)** |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Blackboard<class_Blackboard>` | :ref:`top<class_Blackboard_method_top>` **(** **)** |const| |
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+-------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------+
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| void | :ref:`unbind_var<class_Blackboard_method_unbind_var>` **(** StringName var_name **)** |
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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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Method Descriptions
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-------------------
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.. _class_Blackboard_method_bind_var_to_property:
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.. rst-class:: classref-method
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void **bind_var_to_property** **(** StringName var_name, Object object, StringName property **)**
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Establish a binding between a variable and the object's property specified by ``property`` and ``object``. Changes to the variable update the property, and vice versa.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_erase_var:
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.. rst-class:: classref-method
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void **erase_var** **(** StringName var_name **)**
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Removes a variable by its name.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_get_parent:
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.. rst-class:: classref-method
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:ref:`Blackboard<class_Blackboard>` **get_parent** **(** **)** |const|
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Returns a Blackboard that serves as the parent scope for this instance.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_get_var:
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.. rst-class:: classref-method
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Variant **get_var** **(** StringName var_name, Variant default=null, bool complain=true **)** |const|
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Returns variable value or ``default`` if variable doesn't exist. If ``complain`` is ``true``, an error will be printed if variable doesn't exist.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_has_var:
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.. rst-class:: classref-method
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bool **has_var** **(** StringName var_name **)** |const|
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Returns ``true`` if the Blackboard contains the ``var_name`` variable, including the parent scopes.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_set_parent:
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.. rst-class:: classref-method
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void **set_parent** **(** :ref:`Blackboard<class_Blackboard>` blackboard **)**
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Assigns the parent scope. If a value isn't in the current Blackboard scope, it will look in the parent scope Blackboard to find it.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_set_var:
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.. rst-class:: classref-method
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void **set_var** **(** StringName var_name, Variant value **)**
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Assigns a value to a Blackboard variable.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_top:
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.. rst-class:: classref-method
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:ref:`Blackboard<class_Blackboard>` **top** **(** **)** |const|
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Returns the topmost **Blackboard** in the scope chain.
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.. rst-class:: classref-item-separator
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----
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.. _class_Blackboard_method_unbind_var:
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.. rst-class:: classref-method
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void **unbind_var** **(** StringName var_name **)**
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Remove binding from a variable.
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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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.. |bitfield| replace:: :abbr:`BitField (This value is an integer composed as a bitmask of the following flags.)`
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