BindKey

bindKey

Binds a keyboard or mouse key to a client-side Lua callback and consumes the corresponding game input while the binding is active.

Syntax

bool bindKey(string keyName, string keyState, function handler [, mixed arguments...])

Parameters

Name	Type	Required	Description
keyName	string	yes	The case-insensitive key name, for example tab, f5, mouse1 or a.
keyState	string	yes	The transition to handle: down, up or both.
handler	function	yes	The callback invoked as handler(keyName, keyState, ...).
arguments...	mixed	no	Optional nil, boolean, number or string values appended to every callback invocation.

Returns

Returns true when the binding is registered, or false for an invalid key, invalid state, duplicate binding or exhausted resource limit.

Examples

Show a scoreboard while Tab is held:

local function handleScoreboard(keyName, keyState)
    if keyState == "down" then
        guiShow(scoreboard)
        guiSetInputActive(scoreboard, true)
    else
        guiSetInputActive(scoreboard, false)
        guiHide(scoreboard)
    end
end

bindKey("tab", "both", handleScoreboard)

Notes

• Available only in client-side resource scripts.
• Bindings are owned by the creating resource and are removed automatically when that resource stops.
• A new binding does not begin while another RmlUi document owns text or pointer input. A key-up transition belonging to an active binding is still delivered so the UI can close safely.
• The client runtime polls keys only while the G1R window is focused. It does not install a global keyboard hook and does not use Unreal ProcessEvent.
• Each resource may register at most 128 bindings.