Improve Blackboard docs
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<?xml version="1.0" encoding="UTF-8" ?>
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<class name="Blackboard" inherits="RefCounted" version="4.1" 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 store to hold data shared by BT tasks.
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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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A key/value store to hold data shared by tasks of a behavior tree.
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Blackboard can serve as a parent scope for another blackboard. In this way, if a value is not found in the active scope, a parent scope Blackboard is asked to return a value. A parent scope Blackboard can have its own parent scope. This structure is called Blackboard scope chain. There is no limit on how many Blackboards can take part in a chain. Blackboard never overwrites parent scope values.
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A new scope can be created by [BTNewScope] or [BTSubtree] tasks. It is automatically created for any [LimboState] that has a non-empty Blackboard data defined, or for any root [LimboHSM].
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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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<return type="void" />
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<param index="0" name="p_key" type="Variant" />
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<description>
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Removes variable by name.
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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_data" qualifiers="const">
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<return type="Dictionary" />
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<description>
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Returns [Blackboard] data as a [Dictionary].
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Returns Blackboard data as a [Dictionary].
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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 a parent scope for this instance.
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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="bool" />
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<param index="0" name="p_key" type="Variant" />
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<description>
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Returns [code]true[/code] if Blackboard contains [code]p_key[/code] variable. Parent scope included.
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Returns [code]true[/code] if the Blackboard contains the [code]p_key[/code] 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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Replaces NodePath variables in the [Blackboard] with references that are retrieved by calling [method Node.get_node] on a [code]p_node[/code] argument.
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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_data">
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<return type="void" />
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<param index="0" name="p_data" type="Dictionary" />
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<description>
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Overrides Blackboard data, discarding anything that was stored at this scope. Use with caution.
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Overwrites Blackboard data, replacing any previously stored variables within current scope. Use with caution.
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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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Sets the parent scope. If a value is not found in the Blackboard's active scope, the parent scope Blackboard will be asked to retrieve it.
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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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<param index="0" name="p_key" type="Variant" />
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<param index="1" name="p_value" type="Variant" />
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<description>
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Sets value of blackboard variable.
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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 topmost [Blackboard] in the scope chain.
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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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</methods>
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