WoW:API IsShiftKeyDown

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Returns true if the shift/ctrl/alt key is currently depressed.

shiftDown = IsShiftKeyDown();
ctrlDown  = IsControlKeyDown();
altDown   = IsAltKeyDown();

Arguments

none

Returns

Boolean

1 (true) if the given key is currently held down, nil otherwise.

Related Events

MODIFIER_STATE_CHANGED - fires when shift/ctrl/alt keys are pressed or released

Example

 if ( IsShiftKeyDown() ) then DoSomething(); end

Note

These functions will only return true if one of the keys is considered a modifier. If the code executing is started with Shift/Control/Alt as part of the key binding, it will return nil. Govtgeek (talk) 01:30, 8 March 2009 (UTC)

These functions actually return the value 1 at this time (when evaluated true).  After the WoD 6.0 API goes into affect the values returned will be boolean true and false (nil).