/// <summary>
/// Extension method to create a WindowScroller
/// </summary>
/// <param name="interopWindow">IInteropWindow</param>
/// <param name="scrollBarType">ScrollBarTypes</param>
/// <param name="forceUpdate">true to force a retry, even if the previous check failed</param>
/// <returns>WindowScroller or null</returns>
public static WindowScroller GetWindowScroller(this IInteropWindow interopWindow, ScrollBarTypes scrollBarType = ScrollBarTypes.Vertical, bool forceUpdate = false)
{
if (!forceUpdate && interopWindow.CanScroll.HasValue && !interopWindow.CanScroll.Value)
{
return(null);
}
var initialScrollInfo = ScrollInfo.Create(ScrollInfoMask.All);
if (User32Api.GetScrollInfo(interopWindow.Handle, scrollBarType, ref initialScrollInfo) && initialScrollInfo.Minimum != initialScrollInfo.Maximum)
{
var windowScroller = new WindowScroller
{
ScrollingWindow = interopWindow,
ScrollBarWindow = interopWindow,
ScrollBarType = scrollBarType,
InitialScrollInfo = initialScrollInfo,
WheelDelta = (int)(120 * (initialScrollInfo.PageSize / WindowScroller.ScrollWheelLinesFromRegistry))
};
interopWindow.CanScroll = true;
return(windowScroller);
}
if (User32Api.GetScrollInfo(interopWindow.Handle, ScrollBarTypes.Control, ref initialScrollInfo) && initialScrollInfo.Minimum != initialScrollInfo.Maximum)
{
var windowScroller = new WindowScroller
{
ScrollingWindow = interopWindow,
ScrollBarWindow = interopWindow,
ScrollBarType = ScrollBarTypes.Control,
InitialScrollInfo = initialScrollInfo,
WheelDelta = (int)(120 * (initialScrollInfo.PageSize / WindowScroller.ScrollWheelLinesFromRegistry))
};
interopWindow.CanScroll = true;
return(windowScroller);
}
interopWindow.CanScroll = false;
return(null);
}
/// <summary>
/// Get current position
/// </summary>
/// <returns>SCROLLINFO</returns>
public bool GetPosition(out ScrollInfo scrollInfo)
{
scrollInfo = ScrollInfo.Create(ScrollInfoMask.All);
return(User32Api.GetScrollInfo(ScrollBarWindow.Handle, ScrollBarType, ref scrollInfo));
}