openmw/docs/source/reference/lua-scripting/events.rst

Built-in events
===============

.. include:: version.rst

Actor events
------------

**OnDeath**

This event is sent to an actor's local script when that actor dies.

.. code-block:: Lua

    eventHandlers = {
        OnDeath = function()
            print('Alas, ye hardly knew me!')
        end
    }

**StartAIPackage, RemoveAIPackages**

Any script can send to any actor (except player, for player will be ignored) events ``StartAIPackage`` and ``RemoveAIPackages``.
The effect is equivalent to calling ``interfaces.AI.startPackage`` or ``interfaces.AI.removePackages`` in a local script on this actor.

Examples:

.. code-block:: Lua

    actor:sendEvent('StartAIPackage', {type='Combat', target=self.object})
    actor:sendEvent('RemoveAIPackages', 'Pursue')

**UseItem**

Any script can send global event ``UseItem`` with arguments ``object``, ``actor``, and optional boolean ``force``.
The actor will use (e.g. equip or consume) the object. The object should be in the actor's inventory.

Example:

.. code-block:: Lua

    core.sendGlobalEvent('UseItem', {object = potion, actor = player, force = true})

UI events
---------

**UiModeChanged**

Every time UI mode is changed built-in scripts send to player the event ``UiModeChanged`` with arguments ``oldMode, ``newMode`` (same as ``I.UI.getMode()``)
and ``arg`` (for example in the mode ``Book`` the argument is the book the player is reading).

.. code-block:: Lua

    eventHandlers = {
        UiModeChanged = function(data)
            print('UiModeChanged from', data.oldMode , 'to', data.newMode, '('..tostring(data.arg)..')')
        end
    }

**AddUiMode**

Equivalent to ``I.UI.addMode``, but can be sent from another object or global script.

.. code-block:: Lua

    player:sendEvent('AddUiMode', {mode = 'Book', target = book})

**SetUiMode**

Equivalent to ``I.UI.setMode``, but can be sent from another object or global script.

.. code-block:: Lua

    player:sendEvent('SetUiMode', {mode = 'Book', target = book})

World events
------------

Global events that just call the corresponding function in `openmw.world`.

.. code-block:: Lua

    -- world.pause(tag)
    core.sendGlobalEvent('Pause', tag)

    -- world.unpause(tag)
    core.sendGlobalEvent('Unpause', tag)

    -- world.setGameTimeScale(scale)
    core.sendGlobalEvent('SetGameTimeScale', scale)

    -- world.setSimulationTimeScale(scale)
    core.sendGlobalEvent('SetSimulationTimeScale', scale)