206 lines
8.9 KiB
XML
206 lines
8.9 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="BTTask" inherits="BT" 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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Base class for [BehaviorTree] tasks.
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</brief_description>
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<description>
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Base class for all [BehaviorTree] tasks. A task is a building block in a [BehaviorTree] that represents a specific behavior or control flow. It is the basic unit of the Behavior Tree (BT) and is used to create complex behaviors by combining and nesting tasks in a hierarchy.
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Tasks perform work and return their status with [method _tick]. See [enum BT.Status].
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A Task can be an action, a condition, a composite, or a decorator. Each type of task has its own corresponding subclass: [BTAction], [BTCondition], [BTDecorator], [BTComposite].
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[b]Note:[/b] Do not extend [code]BTTask[/code] directly for your own tasks, instead extend one of the subtypes above.
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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="_enter" qualifiers="virtual">
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<return type="void" />
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<description>
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Called when task is "entered", i.e. when task is executed while not having a [constant BT.RUNNING] [member status].
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It is called before [method _tick] in the execution order. This method is used when preparation is needed before main work begins, usually when it takes more than one tick to finish the task.
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</description>
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</method>
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<method name="_exit" qualifiers="virtual">
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<return type="void" />
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<description>
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Called when task is "exited", i.e. after [method _tick] returns [constant BT.SUCCESS] or [constant BT.FAILURE] status.
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</description>
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</method>
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<method name="_generate_name" qualifiers="virtual const">
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<return type="String" />
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<description>
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When [member custom_name] is empty, the string returned by this method is used to display the task by the editor. See [method get_task_name].
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</description>
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</method>
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<method name="_get_configuration_warning" qualifiers="virtual const">
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<return type="PackedStringArray" />
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<description>
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The string returned by this method is displayed as a warning in the BT editor if the script that overrides it is a [code]tool[/code] script.
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</description>
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</method>
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<method name="_setup" qualifiers="virtual">
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<return type="void" />
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<description>
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Called when task is initialized during behavior tree initialization.
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</description>
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</method>
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<method name="_tick" qualifiers="virtual">
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<return type="int" enum="BT.Status" />
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<param index="0" name="p_delta" type="float" />
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<description>
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Called when task is "ticked", i.e. executed by [BTPlayer] or [BTState] during update.
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Returns [enum BT.Status].
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*Note:* Tasks perform their main function by implementing this method.
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</description>
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</method>
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<method name="add_child">
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<return type="void" />
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<param index="0" name="p_child" type="BTTask" />
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<description>
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Adds a child task. The [code]p_child[/code] is placed at the end of the children list.
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</description>
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</method>
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<method name="add_child_at_index">
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<return type="void" />
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<param index="0" name="p_child" type="BTTask" />
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<param index="1" name="p_idx" type="int" />
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<description>
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Adds a child task. The [code]p_child[/code] is placed at [code]p_idx[/code] position in the children list.
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</description>
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</method>
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<method name="clone" qualifiers="const">
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<return type="BTTask" />
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<description>
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Clones the task and its children with the exported members copied. Sub-resources are shared for efficiency, except for [BBParam] subtypes, which are always copied.
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</description>
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</method>
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<method name="execute">
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<return type="int" enum="BT.Status" />
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<param index="0" name="p_delta" type="float" />
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<description>
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Performs task's execution. During execution [method _enter] is called first, unless current task [member status] is [code]RUNNING[/code]. [method _tick] is called next to perform task's main function. If [constant BT.SUCCESS] or [constant BT.FAILURE] status is returned by [method _tick], [method _exit] will be called next.
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</description>
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</method>
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<method name="get_child" qualifiers="const">
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<return type="BTTask" />
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<param index="0" name="p_idx" type="int" />
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<description>
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Returns a child task by its index.
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</description>
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</method>
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<method name="get_child_count" qualifiers="const">
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<return type="int" />
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<description>
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Returns the number of child tasks.
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</description>
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</method>
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<method name="get_child_count_excluding_comments" qualifiers="const">
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<return type="int" />
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<description>
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Returns the number of child tasks not counting [BTComment] tasks.
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</description>
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</method>
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<method name="get_child_index" qualifiers="const">
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<return type="int" />
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<param index="0" name="p_child" type="BTTask" />
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<description>
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Returns the child task's index. If [code]p_child[/code] is not a child of the task, [code]-1[/code] is returned instead.
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</description>
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</method>
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<method name="get_parent" qualifiers="const">
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<return type="BTTask" />
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<description>
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Returns task's parent.
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</description>
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</method>
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<method name="get_root" qualifiers="const">
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<return type="BTTask" />
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<description>
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Returns the root task of the behavior tree.
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</description>
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</method>
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<method name="get_task_name" qualifiers="const">
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<return type="String" />
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<description>
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The string returned by this method is used to represent the task in the editor.
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[member custom_name] value is returned when it is not empty. Otherwise, the string constructed by [method _generate_name] is returned instead.
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</description>
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</method>
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<method name="has_child" qualifiers="const">
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<return type="bool" />
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<param index="0" name="p_child" type="BTTask" />
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<description>
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Returns [code]true[/code] if [code]p_child[/code] is a child of this task.
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</description>
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</method>
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<method name="initialize">
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<return type="void" />
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<param index="0" name="p_agent" type="Node" />
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<param index="1" name="p_blackboard" type="Blackboard" />
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<description>
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Initilizes the task. Assigns [member agent] and [member blackboard], and calls [method _setup] for the task and its children.
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The method is called recursively for each child task.
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</description>
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</method>
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<method name="is_descendant_of" qualifiers="const">
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<return type="bool" />
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<param index="0" name="p_task" type="BTTask" />
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<description>
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Returns [code]true[/code] if this task is descendant of [code]p_task[/code]. I.e. this task must be a child of [code]p_task[/code] or one of its children or grandchildren.
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</description>
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</method>
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<method name="is_root" qualifiers="const">
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<return type="bool" />
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<description>
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Returns [code]true[/code] if this task is the root task of the tree. A behavior tree can have only one root task.
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</description>
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</method>
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<method name="next_sibling" qualifiers="const">
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<return type="BTTask" />
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<description>
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Returns the next task after this task in the children list of the parent.
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Returns [code]null[/code] if this task has no parent or it is the last child in the parent's children list.
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</description>
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</method>
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<method name="print_tree" qualifiers="const">
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<return type="void" />
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<param index="0" name="p_initial_tabs" type="int" default="0" />
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<description>
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Prints the subtree that starts with this task to console.
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</description>
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</method>
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<method name="remove_child">
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<return type="void" />
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<param index="0" name="p_child" type="BTTask" />
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<description>
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Removes [code]p_child[/code] task from children.
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</description>
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</method>
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<method name="remove_child_at_index">
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<return type="void" />
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<param index="0" name="p_idx" type="int" />
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<description>
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Removes a child task by index.
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</description>
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</method>
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</methods>
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<members>
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<member name="agent" type="Node" setter="set_agent" getter="get_agent">
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The agent is a contextual object for the task's behavior tree instance. Usually, agent is the owner of a node with the [BehaviorTree] resource.
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</member>
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<member name="blackboard" type="Blackboard" setter="" getter="get_blackboard">
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Provides access to the blackboard for this task and behavior tree. Blackboard is used to share data among tasks of the associated behavior tree.
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See [Blackboard] for additional info.
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</member>
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<member name="custom_name" type="String" setter="set_custom_name" getter="get_custom_name" default="""">
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User provided name for the task. If not empty, [code]custom_name[/code] is used by the editor to display the task. See [method get_task_name].
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</member>
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<member name="elapsed_time" type="float" setter="" getter="get_elapsed_time">
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Elapsed time since the task was entered.
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Returns 0 when task is not [code]RUNNING[/code].
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</member>
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<member name="status" type="int" setter="" getter="get_status" enum="BT.Status">
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Last execution [enum BT.Status] returned by [method _tick].
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</member>
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</members>
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</class>
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