/// <summary>
/// Discover the preferred size of the element.
/// </summary>
/// <param name="context">Layout context.</param>
public override Size GetPreferredSize(ViewLayoutContext context)
{
Debug.Assert(context != null);
// Validate incoming reference
if (context == null)
{
throw new ArgumentNullException("context");
}
// During disposal the view control will not longer exist
if (_viewControl != null)
{
// Ensure the control has the correct parent
UpdateParent(context.Control);
// Ensure context has the correct control
using (CorrectContextControl ccc = new CorrectContextControl(context, _viewControl))
{
// Ask the view for its preferred size
if (_viewChild != null)
{
return(_viewChild.GetPreferredSize(context));
}
}
}
return(Size.Empty);
}
/// <summary>
/// Discover the preferred size of the element.
/// </summary>
/// <param name="context">Layout context.</param>
public override Size GetPreferredSize(ViewLayoutContext context)
{
return(_child.GetPreferredSize(context));
}
/// <summary>
/// Perform a layout of the elements.
/// </summary>
/// <param name="context">Layout context.</param>
public override void Layout(ViewLayoutContext context)
{
Debug.Assert(context != null);
// Validate incoming reference
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
// We take on all the available display area
Rectangle original = context.DisplayRectangle;
ClientRectangle = original;
// Layout each child
int offset = 0;
int space = (_orientation == Orientation.Vertical ? ClientHeight : ClientWidth);
for (int i = 0; i < Count; i++)
{
ViewBase child = this[i];
// Find length of this item
int length;
// If this is the last item then it takes the remaining space
if (i == (Count - 1))
{
length = space;
}
else
{
// Give this item an equal portion of the remainder
length = space / (Count - i);
}
// Ask child for it's own preferred size
Size childPreferred = child.GetPreferredSize(context);
// Size child to our relevant dimension
if (_orientation == Orientation.Vertical)
{
context.DisplayRectangle = new Rectangle(ClientRectangle.X,
ClientRectangle.Y + offset,
childPreferred.Width,
length);
}
else
{
context.DisplayRectangle = new Rectangle(ClientRectangle.X + offset,
ClientRectangle.Y,
length,
ClientRectangle.Height);
}
// Ask the child to layout
child.Layout(context);
// Adjust running values
offset += length;
space -= length;
}
// Put back the original display value now we have finished
context.DisplayRectangle = original;
}