65 lines
2.3 KiB
Lua
65 lines
2.3 KiB
Lua
--[[
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-- Player position listeners
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--]]
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--- Register a callback that will be called everytime a player moves.
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-- @param name Unique name of the callback. Used to remove.
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-- @param callback Callback function. Take <player>, <old_pos>, <new_pos> arguments.
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-- The first call will have <old_pos> set to nil.
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function poschangelib.add_player_pos_listener(name, callback)
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if poschangelib.player_pos_listeners[name] then
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minetest.log('error', 'Player pos listener ' .. name .. ' is already registered')
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return
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end
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poschangelib.player_pos_listeners[name] = callback
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end
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--- Remove a registered callback. It won't be called anymore.
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function poschangelib.remove_player_pos_listener(name)
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if poschangelib.player_pos_listeners[name] then
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poschangelib.player_pos_listeners[name] = nil
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end
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end
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--[[
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-- Walk listeners
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--]]
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--- Register a callback that will be called everytime a player moves on a block.
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-- @param callback Callback function. Takes <player>, <pos>, <node>,
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-- <node definition> as arguments.
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-- Node is the node below the player's position.
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-- @param nodenames List of node names or group (with 'group:X') to observe.
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-- The callback will be triggered only if the block has the same name or
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-- has one of these groups.
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function poschangelib.add_player_walk_listener(name, callback, nodenames)
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for _, nodename in ipairs(nodenames) do
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if not poschangelib.walk_listeners[nodename] then
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poschangelib.walk_listeners[nodename] = {}
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end
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if poschangelib.walk_listeners[nodename][name] then
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minetest.log('error', 'Walk listener ' .. name .. ' is already registered')
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end
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poschangelib.walk_listeners[nodename][name] = callback
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end
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end
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function poschangelib.remove_player_walk_listener(name, nodenames)
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local counts = {}
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for _, nodename in ipairs(nodenames) do
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if not counts[nodename] then counts[nodename] = 0 end
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counts[nodename] = counts[nodename] + 1
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if poschangelib.walk_listeners[nodename] and poschangelib.walk_listeners[nodename][name] then
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poschangelib.walk_listeners[nodename][name] = nil
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counts[nodename] = counts[nodename] - 1
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end
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end
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-- If no listener left for the group, remove the group
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-- to be able to skip node check if there are none left
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for _, nodename in pairs(counts) do
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if counts[nodename] == 0 then
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poschangelib.walk_listeners[nodename] = nil
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end
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end
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end
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