void OnScrollToRequested(ScrollToRequestedEventArgs e)
{
EventHandler <ScrollToRequestedEventArgs> handler = ScrollToRequested;
if (handler != null)
{
handler(this, e);
}
}
void OnScrollToRequested(ScrollToRequestedEventArgs e)
{
CheckTaskCompletionSource();
EventHandler <ScrollToRequestedEventArgs> handler = ScrollToRequested;
if (handler != null)
{
handler(this, e);
}
}
internal override void OnIsPlatformEnabledChanged()
{
base.OnIsPlatformEnabledChanged();
if (IsPlatformEnabled && _pendingScroll != null)
{
OnScrollToRequested(_pendingScroll);
_pendingScroll = null;
}
}
public void ScrollTo(object item, ScrollToPosition position, bool animated)
{
if (!Enum.IsDefined(typeof(ScrollToPosition), position))
throw new ArgumentException("position is not a valid ScrollToPosition", "position");
var args = new ScrollToRequestedEventArgs(item, position, animated);
if (IsPlatformEnabled)
OnScrollToRequested(args);
else
_pendingScroll = args;
}
public void ScrollTo(object item, object group, ScrollToPosition position, bool animated)
{
if (!IsGroupingEnabled)
{
throw new InvalidOperationException("Grouping is not enabled");
}
if (!Enum.IsDefined(typeof(ScrollToPosition), position))
{
throw new ArgumentException("position is not a valid ScrollToPosition", "position");
}
var args = new ScrollToRequestedEventArgs(item, group, position, animated);
if (IsPlatformEnabled)
{
OnScrollToRequested(args);
}
else
{
_pendingScroll = args;
}
}
public Task ScrollToAsync(Element element, ScrollToPosition position, bool animated)
{
if (!Enum.IsDefined(typeof(ScrollToPosition), position))
{
throw new ArgumentException("position is not a valid ScrollToPosition", "position");
}
if (element == null)
{
throw new ArgumentNullException("element");
}
if (!CheckElementBelongsToScrollViewer(element))
{
throw new ArgumentException("element does not belong to this ScrollView", "element");
}
var args = new ScrollToRequestedEventArgs(element, position, animated);
OnScrollToRequested(args);
return(_scrollCompletionSource.Task);
}
void OnScrollToRequested(ScrollToRequestedEventArgs e) => ScrollToRequested?.Invoke(this, e);
void OnScrollToRequested(ScrollToRequestedEventArgs e)
{
CheckTaskCompletionSource();
ScrollToRequested?.Invoke(this, e);
}
void Handle_ScrollToRequested(object sender, Xamarin.Forms.ScrollToRequestedEventArgs e)
{
}
void OnScrollToRequested(ScrollToRequestedEventArgs e)
{
CheckTaskCompletionSource();
EventHandler<ScrollToRequestedEventArgs> handler = ScrollToRequested;
if (handler != null)
handler(this, e);
}
public Task ScrollToAsync(Element element, ScrollToPosition position, bool animated)
{
if (!Enum.IsDefined(typeof(ScrollToPosition), position))
throw new ArgumentException("position is not a valid ScrollToPosition", "position");
if (element == null)
throw new ArgumentNullException("element");
if (!CheckElementBelongsToScrollViewer(element))
throw new ArgumentException("element does not belong to this ScrollVIew", "element");
var args = new ScrollToRequestedEventArgs(element, position, animated);
OnScrollToRequested(args);
return _scrollCompletionSource.Task;
}
public Task ScrollToAsync(double x, double y, bool animated)
{
var args = new ScrollToRequestedEventArgs(x, y, animated);
OnScrollToRequested(args);
return _scrollCompletionSource.Task;
}