Identifies the currently-hovered or currently-active handle of a TransformControls. null when no handle is hovered or active.
null
"X"
"Y"
"Z"
"XY"
"YZ"
"XZ"
"XYZ"
"E"
"XYZE"
Identifies the currently-hovered or currently-active handle of a TransformControls.
nullwhen no handle is hovered or active."X","Y","Z","XY","YZ","XZ","XYZ"(centre / uniform handle)."X","Y","Z","E"(view-aligned ring),"XYZE"(view-aligned trackball).