/// <summary>
/// Initializes a new instance of the <see cref="PixelScrollAxis"/> class.
/// </summary>
/// <param name="sb">The scrollbar state.</param>
/// <param name="scrollLinesHost">The scroll lines host.</param>
/// <param name="distancesHost">The distances host.</param>
public PixelScrollAxis(IScrollBar sb, ILineSizeHost scrollLinesHost, IDistancesHost distancesHost)
: base(sb, scrollLinesHost)
{
if (distancesHost != null)
{
this.distancesHost = distancesHost;
}
else if (scrollLinesHost != null)
{
this.distances = new DistanceRangeCounterCollection
{
DefaultDistance = scrollLinesHost.GetDefaultLineSize()
};
scrollLinesHost.InitializeScrollAxis(this);
}
if (Distances == null)
{
throw new ArgumentNullException("Distances");
}
}
/// <summary>
/// Initializes a new instance of the <see cref="PixelScrollAxis"/> class which
/// is nested as a single line in a parent scroll axis.
/// </summary>
/// <param name="parentScrollAxis">The parent scroll axis.</param>
/// <param name="sb">The scrollbar state.</param>
/// <param name="scrollLinesHost">The scroll lines host.</param>
/// <param name="distancesHost">The distances host.</param>
public PixelScrollAxis(ScrollAxisBase parentScrollAxis, IScrollBar sb, ILineSizeHost scrollLinesHost, IDistancesHost distancesHost)
: base(sb, scrollLinesHost)
{
// GridCellGridRenderer passes in Distances. LineSizeCollection holds them.
// This allows faster construction of grids when they were scrolled out of view
// and unloaded.
this.parentScrollAxis = parentScrollAxis;
this.distancesHost = distancesHost;
if (Distances == null)
{
throw new ArgumentNullException("Distances");
}
}
