deltaX property Null safety
The amount that is expected to scroll horizontally, in units determined by deltaMode.
See also:
- WheelEvent.deltaX from the W3C.
Implementation
num get deltaX {
if (JS('bool', '#.deltaX !== undefined', this)) {
// W3C WheelEvent
return this._deltaX;
}
throw new UnsupportedError('deltaX is not supported');
}