internal static bool IsListItemOffScreen(Rect itemBounds,
SWF.Control containerControl,
bool visibleHeader,
Rectangle headerBounds,
IScrollBehaviorObserver observer)
{
Rectangle listViewRectangle = containerControl.Bounds;
if (visibleHeader)
{
listViewRectangle.Y += headerBounds.Height;
listViewRectangle.Height -= headerBounds.Height;
}
if (observer.HorizontalScrollBar.Visible)
{
listViewRectangle.Height -= observer.HorizontalScrollBar.Height;
}
if (observer.VerticalScrollBar.Visible)
{
listViewRectangle.Width -= observer.VerticalScrollBar.Width;
}
Rect screen
= Helper.RectangleToRect(containerControl.Parent.RectangleToScreen(listViewRectangle));
return(!itemBounds.IntersectsWith(screen));
}
protected void UpdateScrollBehavior(IScrollBehaviorObserver observer)
{
if (observer != null && observer.SupportsScrollPattern)
{
SetBehavior(ScrollPatternIdentifiers.Pattern,
GetBehaviorRealization(ScrollPatternIdentifiers.Pattern));
}
else
{
SetBehavior(ScrollPatternIdentifiers.Pattern, null);
}
if (ScrollPatternSupportChanged != null)
{
ScrollPatternSupportChanged();
}
}
protected void UpdateScrollBehavior (IScrollBehaviorObserver observer)
{
if (observer != null && observer.SupportsScrollPattern)
SetBehavior (ScrollPatternIdentifiers.Pattern,
GetBehaviorRealization (ScrollPatternIdentifiers.Pattern));
else
SetBehavior (ScrollPatternIdentifiers.Pattern, null);
if (ScrollPatternSupportChanged != null)
ScrollPatternSupportChanged ();
}
