89 lines
4.2 KiB
XML
89 lines
4.2 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Blackboard" inherits="RefCounted" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../doc/class.xsd">
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<brief_description>
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A key/value storage for sharing among [LimboHSM] states and [BehaviorTree] tasks.
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</brief_description>
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<description>
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Blackboard is where data is stored and shared between states in the [LimboHSM] system and tasks in a [BehaviorTree]. Each state and task in the [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 [BTNewScope] and [BTSubtree] decorators. Additionally, a new scope is automatically created for any [LimboState] that has defined non-empty Blackboard data or for any root-level [LimboHSM] node.
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="bind_var_to_property">
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<return type="void" />
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<param index="0" name="p_name" type="String" />
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<param index="1" name="p_object" type="Object" />
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<param index="2" name="p_property" type="StringName" />
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<description>
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Establish a binding between a variable and the object's property specified by [param p_property] and [param p_object]. Changes to the variable update the property, and vice versa.
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</description>
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</method>
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<method name="erase_var">
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<return type="void" />
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<param index="0" name="p_name" type="String" />
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<description>
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Removes a variable by its name.
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</description>
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</method>
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<method name="get_parent_scope" qualifiers="const">
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<return type="Blackboard" />
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<description>
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Returns a Blackboard that serves as the parent scope for this instance.
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</description>
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</method>
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<method name="get_var" qualifiers="const">
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<return type="Variant" />
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<param index="0" name="p_name" type="String" />
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<param index="1" name="p_default" type="Variant" default="null" />
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<param index="2" name="p_complain" type="bool" default="true" />
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<description>
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Returns variable value or [param p_default] if variable doesn't exist. If [param p_complain] is [code]true[/code], an error will be printed if variable doesn't exist.
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</description>
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</method>
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<method name="has_var" qualifiers="const">
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<return type="bool" />
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<param index="0" name="p_name" type="String" />
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<description>
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Returns [code]true[/code] if the Blackboard contains the [param p_name] variable, including the parent scopes.
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</description>
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</method>
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<method name="prefetch_nodepath_vars">
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<return type="void" />
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<param index="0" name="p_node" type="Node" />
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<description>
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If [code]true[/code], any [NodePath] variables in the [Blackboard] are replaced with [Node] references when the tree is instantiated. References are retrieved by calling [method Node.get_node] on the agent instance.
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</description>
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</method>
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<method name="set_parent_scope">
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<return type="void" />
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<param index="0" name="p_blackboard" type="Blackboard" />
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<description>
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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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</description>
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</method>
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<method name="set_var">
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<return type="void" />
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<param index="0" name="p_name" type="String" />
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<param index="1" name="p_value" type="Variant" />
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<description>
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Assigns a value to a Blackboard variable.
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</description>
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</method>
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<method name="top" qualifiers="const">
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<return type="Blackboard" />
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<description>
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Returns the topmost [Blackboard] in the scope chain.
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</description>
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</method>
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<method name="unbind_var">
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<return type="void" />
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<param index="0" name="p_name" type="String" />
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<description>
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Remove binding from a variable.
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</description>
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</method>
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</methods>
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</class>
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