/**
*
* Handle mouse-down events on the scroll thumb. Records
* the mouse down point in _clickOffset.
*/
protected virtual void ThumbMouseDownHandler(Event e)
{
e.CancelAndStopPropagation();
DragManager.IsDragging = true;
//Debug.Log("ThumbMouseDownHandler: " + e);
MouseEvent me = (MouseEvent)e;
var sm = SystemEventDispatcher.Instance;
sm.AddEventListener(MouseEvent.MOUSE_MOVE,
SystemMouseMoveHandler);
sm.AddEventListener(MouseEvent.MOUSE_UP,
SystemMouseUpHandler);
_clickOffset = Thumb.GlobalToLocal(me.GlobalPosition);
DispatchEvent(new TrackBaseEvent(TrackBaseEvent.THUMB_PRESS));
DispatchEvent(new FrameworkEvent(FrameworkEvent.CHANGE_START));
}
/**
*
* Capture mouse-move events anywhere on or off the stage.
* First, we calculate the new value based on the new position
* using calculateNewValue(). Then, we move the thumb to
* the new value's position. Last, we set the value and
* dispatch a "change" event if the value changes.
*/
protected virtual void SystemMouseMoveHandler(Event e)
{
if (null == Track)
{
return;
}
MouseEvent me = (MouseEvent)e;
Point p = Track.GlobalToLocal(me.GlobalPosition);
float newValue = PointToValue(p.X - _clickOffset.X, p.Y - _clickOffset.Y);
newValue = NearestValidValue(newValue, SnapInterval);
if (newValue != Value)
{
SetValue(newValue);
DispatchEvent(new TrackBaseEvent(TrackBaseEvent.THUMB_DRAG));
DispatchEvent(new Event(Event.CHANGE));
}
}
