/// <summary>
/// Initialize a new instance of the ViewBase class.
/// </summary>
protected ViewDecorator(ViewBase child)
{
Debug.Assert(child != null);
_child = child;
_child.Parent = this;
}
/// <summary>
/// Perform a layout of the elements.
/// </summary>
/// <param name="context">Layout context.</param>
public override void Layout(ViewLayoutContext context)
{
Debug.Assert(context != null);
// We take on all the available display area
ClientRectangle = context.DisplayRectangle;
// Maximum space available for the next child
Rectangle childRectangle = ClientRectangle;
// Find the last visible child
ViewBase lastVisible = null;
foreach (ViewBase child in Reverse())
{
if (child.Visible)
{
lastVisible = child;
break;
}
}
// Position each entry, with last entry filling remaining of space
foreach (ViewBase child in this)
{
if (child.Visible)
{
// Provide the total space currently available
context.DisplayRectangle = childRectangle;
// Get the preferred size of the child
Size childSize = child.GetPreferredSize(context);
if (Horizontal)
{
// Ask child to fill the available height
childSize.Height = childRectangle.Height;
if ((child == lastVisible) && FillLastChild)
{
// This child takes all remainder width
childSize.Width = childRectangle.Width;
}
else
{
// Reduce remainder space to exclude this child
childRectangle.X += childSize.Width;
childRectangle.Width -= childSize.Width;
}
}
else
{
// Ask child to fill the available width
childSize.Width = childRectangle.Width;
if ((child == lastVisible) && FillLastChild)
{
// This child takes all remainder height
childSize.Height = childRectangle.Height;
}
else
{
// Reduce remainder space to exclude this child
childRectangle.Y += childSize.Height;
childRectangle.Height -= childSize.Height;
}
}
// Use the update child size as the actual space for layout
context.DisplayRectangle = new Rectangle(context.DisplayRectangle.Location, childSize);
// Layout child in the provided space
child.Layout(context);
}
}
// Put back the original display value now we have finished
context.DisplayRectangle = ClientRectangle;
}
/// <summary>
/// Initialize a new instance of the ViewBase class.
/// </summary>
public ViewDecoratorFixedSize(ViewBase child, Size fixedSize)
: base(child)
{
FixedSize = fixedSize;
}