protected override void Dispose(bool disposing)
{
if (disposing)
{
if (_packager == null)
{
return;
}
Element?.ClearValue(Platform.RendererProperty);
SetElement(null);
_shellScrollTracker.Dispose();
_shellScrollTracker = null;
_packager.Dispose();
_packager = null;
_tracker.NativeControlUpdated -= OnNativeControlUpdated;
_tracker.Dispose();
_tracker = null;
_events.Dispose();
_events = null;
_insetTracker.Dispose();
_insetTracker = null;
ScrollAnimationEnded -= HandleScrollAnimationEnded;
Scrolled -= HandleScrolled;
}
base.Dispose(disposing);
}
public void SetElement(VisualElement element)
{
_requestedScroll = null;
var oldElement = Element;
Element = element;
if (oldElement != null)
{
oldElement.PropertyChanged -= HandlePropertyChanged;
((ScrollView)oldElement).ScrollToRequested -= OnScrollToRequested;
}
if (element != null)
{
element.PropertyChanged += HandlePropertyChanged;
((ScrollView)element).ScrollToRequested += OnScrollToRequested;
if (_packager == null)
{
_packager = new VisualElementPackager(this);
_packager.Load();
_tracker = new VisualElementTracker(this);
_tracker.NativeControlUpdated += OnNativeControlUpdated;
_events = new EventTracker(this);
_events.LoadEvents(this);
_insetTracker = new KeyboardInsetTracker(this, () => Window, insets => ContentInset = ScrollIndicatorInsets = insets, point =>
{
var offset = ContentOffset;
offset.Y += point.Y;
SetContentOffset(offset, true);
});
}
UpdateDelaysContentTouches();
UpdateContentSize();
UpdateBackgroundColor();
UpdateIsEnabled();
UpdateVerticalScrollBarVisibility();
UpdateHorizontalScrollBarVisibility();
_shellScrollTracker = new ShellScrollViewTracker(this);
OnElementChanged(new VisualElementChangedEventArgs(oldElement, element));
EffectUtilities.RegisterEffectControlProvider(this, oldElement, element);
if (element != null)
{
element.SendViewInitialized(this);
}
if (!string.IsNullOrEmpty(element.AutomationId))
{
AccessibilityIdentifier = element.AutomationId;
}
}
}
public KeyboardInsetTracker(UIScrollView targetView, Func <UIWindow> fetchWindow, Action <UIEdgeInsets> setInsetAction, Action <PointF> setContentOffset, IVisualElementRenderer renderer)
{
_setContentOffset = setContentOffset;
_targetView = targetView;
_fetchWindow = fetchWindow;
_setInsetAction = setInsetAction;
KeyboardObserver.KeyboardWillShow += OnKeyboardShown;
KeyboardObserver.KeyboardWillHide += OnKeyboardHidden;
if (renderer != null)
{
_shellScrollViewTracker = new ShellScrollViewTracker(renderer);
}
}
public void Dispose()
{
if (_disposed)
{
return;
}
_disposed = true;
KeyboardObserver.KeyboardWillShow -= OnKeyboardShown;
KeyboardObserver.KeyboardWillHide -= OnKeyboardHidden;
_shellScrollViewTracker?.Dispose();
_shellScrollViewTracker = null;
}