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42 lines
1.3 KiB
Plaintext
42 lines
1.3 KiB
Plaintext
// Observer Pattern Implementation: Direction Set
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// Registration type: /atom
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//
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// Raised when: An /atom changes dir using the set_dir() proc.
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//
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// Arguments that the called proc should expect:
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// /atom/dir_changer: The instance that changed direction
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// /old_dir: The dir before the change.
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// /new_dir: The dir after the change.
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var/singleton/observ/dir_set/dir_set_event = new()
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/singleton/observ/dir_set
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name = "Direction Set"
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expected_type = /atom
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/singleton/observ/dir_set/register(var/atom/dir_changer, var/datum/listener, var/proc_call)
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. = ..()
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// Listen to the parent if possible.
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if(. && istype(dir_changer.loc, /atom/movable)) // We don't care about registering to turfs.
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register(dir_changer.loc, dir_changer, TYPE_PROC_REF(/atom, recursive_dir_set))
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/*********************
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* Direction Handling *
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*********************/
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/atom/set_dir()
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var/old_dir = dir
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UNLINT(. = ..())
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if(old_dir != dir)
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dir_set_event.raise_event(src, old_dir, dir)
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/atom/movable/Entered(var/atom/movable/am, atom/old_loc)
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. = ..()
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if(dir_set_event.has_listeners(am))
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dir_set_event.register(src, am, TYPE_PROC_REF(/atom, recursive_dir_set))
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/atom/movable/Exited(var/atom/movable/am, atom/new_loc)
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. = ..()
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dir_set_event.unregister(src, am, TYPE_PROC_REF(/atom, recursive_dir_set))
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