/// <summary>
/// Scroll the horizontal list position if needed to ensure that the
/// ItemEntry \a item is, if possible, fully visible witin the
/// ScrolledItemListBase viewable area.
/// </summary>
/// <param name="item">
/// const reference to an ItemEntry attached to this ScrolledItemListBase
/// that should be made visible in the view area.
/// </param>
public void EnsureItemIsVisibleHorz(ItemEntry item)
{
var renderArea = GetItemRenderArea();
var h = GetHorzScrollbar();
var currPos = h.GetScrollPosition();
var left = CoordConverter.AsAbsolute(item.GetXPosition(), GetPixelSize().Width) - currPos;
var right = left + item.GetItemPixelSize().Width;
// if left is left of the view area, or if item too big, scroll item to left
if ((left < renderArea.d_min.X) || ((right - left) > renderArea.Width))
{
h.SetScrollPosition(currPos + left);
}
// if right is right of the view area, scroll item to right of list
else if (right >= renderArea.d_max.X)
{
h.SetScrollPosition(currPos + right - renderArea.Width);
}
}
/// <summary>
/// Scroll the vertical list position if needed to ensure that the ItemEntry
/// \a item is, if possible, fully visible witin the ScrolledItemListBase
/// viewable area.
/// </summary>
/// <param name="item">
/// const reference to an ItemEntry attached to this ScrolledItemListBase
/// that should be made visible in the view area.
/// </param>
public void EnsureItemIsVisibleVert(ItemEntry item)
{
var renderArea = GetItemRenderArea();
var v = GetVertScrollbar();
var currPos = v.GetScrollPosition();
var top = CoordConverter.AsAbsolute(item.GetYPosition(), GetPixelSize().Height) - currPos;
var bottom = top + item.GetItemPixelSize().Height;
// if top is above the view area, or if item is too big, scroll item to top
if ((top < renderArea.d_min.Y) || ((bottom - top) > renderArea.Height))
{
v.SetScrollPosition(currPos + top);
}
// if bottom is below the view area, scroll item to bottom of list
else if (bottom >= renderArea.d_max.Y)
{
v.SetScrollPosition(currPos + bottom - renderArea.Height);
}
}