https://wiki.returnofreckoning.com/index.php?action=history&feed=atom&title=API%3AIsModifierKeyAPI:IsModifierKey - Revision history2026-10-18T08:55:40ZRevision history for this page on the wikiMediaWiki 1.43.11https://wiki.returnofreckoning.com/index.php?title=API:IsModifierKey&diff=30517&oldid=prevMaintenance script: UI Lua API import (WAR 1.4.8)2026-10-16T19:45:49Z<p>UI Lua API import (WAR 1.4.8)</p>
<p><b>New page</b></p><div>{{LuaApi|group=Interface}}<br />
Returns whether a keyboard key code is one of the Shift, Ctrl or Alt keys.<br />
<br />
<pre><br />
isModifier = IsModifierKey(keyCode)<br />
</pre><br />
<br />
== Arguments ==<br />
;keyCode : <code>number</code> – Keyboard key code, as used by the key-binding data. Fractions are dropped.<br />
<br />
== Returns ==<br />
;isModifier : <code>boolean</code> – <code>true</code> for a modifier key.<br />
<br />
== Details ==<br />
* Exactly six codes count as modifiers: 42 (left Shift), 54 (right Shift), 29 (left Ctrl), 157 (right Ctrl), 56 (left Alt) and 184 (right Alt). These are keyboard scan codes. Every other number returns <code>false</code>.<br />
* Only the number is checked; the device the code came from is not known to the function. The stock key-mapping window checks for a keyboard first (see the example).<br />
* The function needs at least one argument and only reads the last one.<br />
<br />
== Errors ==<br />
None besides the generic ''Invalid Parameters'' message when the argument is missing or not a number.<br />
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== Example ==<br />
From <code>ea_keymappingwindow/source/keymappingwindow.lua</code>:<br />
<pre><br />
if( ( deviceId ~= SystemData.InputDevice.KEYBOARD ) or not IsModifierKey( itemId ) )<br />
</pre><br />
<br />
From the same file:<br />
<pre><br />
local function IsOppositeModifierKeyInTable( keyTable, itemId )<br />
if( IsModifierKey( itemId ) )<br />
then<br />
return keyTable[ modiferKeyOppositeLookup[ itemId ] ] ~= nil<br />
else<br />
return false<br />
</pre><br />
<br />
== See also ==<br />
* [[API:GetBindingsForAction|GetBindingsForAction]]<br />
* [[API:AddBinding|AddBinding]]</div>Maintenance script