ScrollDataGrid

gistfile1.cs

public class ScrollDataGrid : DataGrid
{
	/// <summary>
	/// The vertical scrollbar.
	/// </summary>
	private ScrollBar verticalScrollBar;

	/// <summary>
	/// The horizontal scrollbar.
	/// </summary>
	private ScrollBar horizontalScrollBar;

	/// <summary>
	/// Position of the vertical scrollbar we saved.
	/// </summary>
	private double savedVerticalScrollPosition;

	/// <summary>
	/// Position of the horizontal scrollbar we saved.
	/// </summary>
	private double savedHorizontalScrollPosition;
	
	/// <summary>
	/// Event for each vertical scroll.
	/// </summary>
	public event EventHandler<ScrollEventArgs> VerticalScroll;

	/// <summary>
	/// Event for each horizontal scroll.
	/// </summary>
	public event EventHandler<ScrollEventArgs> HorizontalScroll;

	/// <summary>
	/// Load the scrollbars after the template gets loaded.
	/// </summary>
	public override void OnApplyTemplate()
	{
		base.OnApplyTemplate();
		this.LoadScrollBars();
	}

	/// <summary>
	/// Get both scrollbars.
	/// </summary>
	private void LoadScrollBars()
	{
		verticalScrollBar = this.GetTemplateChild("VerticalScrollbar") as ScrollBar;
		if (verticalScrollBar != null)
			verticalScrollBar.Scroll += new ScrollEventHandler(OnVerticalScroll);
		horizontalScrollBar = this.GetTemplateChild("HorizontalScrollbar") as ScrollBar;
		if (horizontalScrollBar != null)
			horizontalScrollBar.Scroll += new ScrollEventHandler(OnHorizontalScroll);
	}
	
	/// <summary>
	/// Notify that we are scrolling vertically.
	/// </summary>
	/// <param name="sender"></param>
	/// <param name="e"></param>
	private void OnVerticalScroll(object sender, ScrollEventArgs e)
	{
		if (VerticalScroll != null)
			VerticalScroll(sender, e);
	}

	/// <summary>
	/// Notify that we are scrolling horizontally.
	/// </summary>
	/// <param name="sender"></param>
	/// <param name="e"></param>
	private void OnHorizontalScroll(object sender, ScrollEventArgs e)
	{
		if (HorizontalScroll != null)
			HorizontalScroll(sender, e);
	}
	
	/// <summary>
	/// Save the current scroll position.
	/// </summary>
	/// <param name="mode"></param>
	public void SaveScrollPosition(ScrollMode mode)
	{
		switch (mode)
		{
			case ScrollMode.Vertical:
				this.savedVerticalScrollPosition = verticalScrollBar.Value;
				break;
			case ScrollMode.Horizontal:
				this.savedHorizontalScrollPosition = horizontalScrollBar.Value;
				break;
			default:
				break;
		}
	}

	/// <summary>
	/// Reload the scroll position that was saved before.
	/// </summary>
	/// <param name="mode"></param>
	public void ReloadScrollPosition(ScrollMode mode)
	{
		switch (mode)
		{
			case ScrollMode.Vertical:
				this.Scroll(ScrollMode.Vertical, savedVerticalScrollPosition);
				break;
			case ScrollMode.Horizontal:
				this.Scroll(ScrollMode.Horizontal, savedHorizontalScrollPosition);
				break;
		}
	}
}