/// <summary>Called when the mouse position is updated</summary>
/// <param name="x">X coordinate of the mouse cursor on the GUI</param>
/// <param name="y">Y coordinate of the mouse cursor on the GUI</param>
protected override void OnMouseMoved(float x, float y)
{
if (_beingDragged)
{
// Adjust the control's position within the container
var dx = x - _pickupX;
var dy = y - _pickupY;
Bounds.AbsoluteOffset(dx, dy);
}
else
{
// Remember the current mouse position so we know where the user picked
// up the control when a drag operation begins
_pickupX = x;
_pickupY = y;
}
}