// sets up the scrolling in the correct direction
// utilizes CSDisplayLink, a timer synchronized to the display refresh rate, to execute the smooth automated scrolling
private void SetupScrollTimerInDirection(ScrollingDirection direction)
{
if (DisplayLink != null && !DisplayLink.Paused)
{
var userInfo = userInfos[DisplayLink];
var scrollingDirection = userInfo[ScrollingDirectionKey];
var number = (NSNumber)NSNumber.FromObject(scrollingDirection);
ScrollingDirection oldDirection = (ScrollingDirection)number.Int32Value;
if (direction == oldDirection)
{
return;
}
}
InvalidatesScrollTimer();
DisplayLink = CADisplayLink.Create(HandleScroll);
userInfos.Add(DisplayLink, NSDictionary.FromObjectAndKey(NSNumber.FromInt32((int)direction), new NSString(ScrollingDirectionKey)));
DisplayLink.AddToRunLoop(NSRunLoop.Main, NSRunLoop.NSRunLoopCommonModes);
}
public override void EnterMessageLoop(bool runInBackground)
{
DisplayLink = CADisplayLink.Create(Window, new Selector("Render"));
DisplayLink.AddToRunLoop(NSRunLoop.Current, NSRunLoopMode.Default);
NSRunLoop.Current.Run();
}