void SetupVerticalScrollRelation()
{
this.scBar.SetCustomScrollBarEvaluator((SliderBox sc, out double onePixelFor, out int scrollBoxLength) =>
{
int physicalScrollLength = sc.PhysicalScrollLength;
onePixelFor = 1;
scrollBoxLength = 1;
//1.
int contentLength = scrollableSurface.DesiredHeight;
if (contentLength == 0)
{
return;
}
scrollBoxLength = (int)((physicalScrollLength * scrollableSurface.ViewportHeight) / contentLength);
if (scrollBoxLength < sc.ScrollBoxSizeLimit)
{
scrollBoxLength = sc.ScrollBoxSizeLimit;
onePixelFor = (double)contentLength / (double)(physicalScrollLength - scrollBoxLength);
}
else
{
onePixelFor = (double)contentLength / (double)physicalScrollLength;
}
//temp fix
sc.MaxValue = (contentLength > scrollableSurface.ViewportHeight) ?
contentLength - scrollableSurface.ViewportHeight :
0;
});
//--------------------------------------------------------------------------------------
//1st evaluate
scBar.MaxValue = scrollableSurface.DesiredHeight;
scBar.ReEvaluateScrollBar();
scrollableSurface.LayoutFinished += (s, e) =>
{
scBar.MaxValue = scrollableSurface.DesiredHeight;
scBar.ReEvaluateScrollBar();
};
scBar.UserScroll += (s, e) =>
{
scrollableSurface.SetViewport(scrollableSurface.ViewportX, (int)scBar.ScrollValue);
};
}
//---------------------------------------------------------------------------
//vertical scrollbar
public void ReEvaluateScrollBar()
{
slideBox.ReEvaluateScrollBar();
}