export function standardMouseMoveMerger(lastEvent: IStandardMouseMoveEventData, currentEvent: MouseEvent): IStandardMouseMoveEventData {
	let ev = new StandardMouseEvent(currentEvent);
	ev.preventDefault();
	return {
		leftButton: ev.leftButton,
		posx: ev.posx,
		posy: ev.posy
	};
}

	private _sliderMouseDown(e: StandardMouseEvent): void {
		if (e.leftButton) {
			let initialMouseOrthogonalPosition = this._sliderOrthogonalMousePosition(e);
			let initialScrollPosition = this._getScrollPosition();
			let draggingDelta = this._sliderMousePosition(e) - this._scrollbarState.getSliderPosition();
			DomUtils.toggleClass(this.slider, 'active', true);

			this._mouseMoveMonitor.startMonitoring(
				standardMouseMoveMerger,
				(mouseMoveData: IStandardMouseMoveEventData) => {
					let mouseOrthogonalPosition = this._sliderOrthogonalMousePosition(mouseMoveData);
					let mouseOrthogonalDelta = Math.abs(mouseOrthogonalPosition - initialMouseOrthogonalPosition);
					// console.log(initialMouseOrthogonalPosition + ' -> ' + mouseOrthogonalPosition + ': ' + mouseOrthogonalDelta);
					if (Platform.isWindows && mouseOrthogonalDelta > MOUSE_DRAG_RESET_DISTANCE) {
						// The mouse has wondered away from the scrollbar => reset dragging
						this.setDesiredScrollPosition(initialScrollPosition);
					} else {
						let desiredSliderPosition = this._sliderMousePosition(mouseMoveData) - draggingDelta;
						this.setDesiredScrollPosition(this._scrollbarState.convertSliderPositionToScrollPosition(desiredSliderPosition));
					}
				},
				() => {
					DomUtils.toggleClass(this.slider, 'active', false);
					this._parent.onDragEnd();
				}
			);

			e.preventDefault();
			this._parent.onDragStart();
		}
	}

	private _arrowMouseDown(e: StandardMouseEvent): void {
		let repeater = () => {
			this._parent.onMouseWheel(this._mouseWheelEventFactory());
		};

		let scheduleRepeater = () => {
			this._mousedownRepeatTimer.cancelAndSet(repeater, 1000 / 24);
		};

		repeater();
		this._mousedownRepeatTimer.cancel();
		this._mousedownScheduleRepeatTimer.cancelAndSet(scheduleRepeater, 200);

		this._mouseMoveMonitor.startMonitoring(
			standardMouseMoveMerger,
			(mouseMoveData: IStandardMouseMoveEventData) => {
				/* Intentional empty */
			},
			() => {
				this._mousedownRepeatTimer.cancel();
				this._mousedownScheduleRepeatTimer.cancel();
			}
		);

		e.preventDefault();
	}