/// <summary>
/// Perform a render of the elements.
/// </summary>
/// <param name="context">Rendering context.</param>
public override void Render(RenderContext context)
{
Debug.Assert(context != null);
// Perform rendering before any children
RenderBefore(context);
// We need to update the redirector for drawing each crumb
PaletteRedirectBreadCrumb redirect = _kryptonBreadCrumb.GetRedirector() as PaletteRedirectBreadCrumb;
var first = true;
for (var i = 0; i < Count; i++)
{
if (this[i].Visible)
{
// Do not show the left border on the first crumb
if (first)
{
redirect.Left = true;
first = false;
}
else
{
redirect.Left = false;
}
this[i].Render(context);
}
}
// Perform rendering after that of children
RenderAfter(context);
}
/// <summary>
/// Discover the preferred size of the element.
/// </summary>
/// <param name="context">Layout context.</param>
public override Size GetPreferredSize(ViewLayoutContext context)
{
// Create/delete child elements to match the current selected bread crumb path
SyncBreadCrumbs();
// We need to update the redirector for drawing each crumb
PaletteRedirectBreadCrumb redirect = _kryptonBreadCrumb.GetRedirector() as PaletteRedirectBreadCrumb;
Size preferredSize = Size.Empty;
for (var i = 1; i < Count; i++)
{
// Do not show the left border on the first crumb
redirect.Left = i == 0;
// Find size of the child
Size childSize = this[i].GetPreferredSize(context);
// Accumulate in width
preferredSize.Width += childSize.Width;
// Find maximum height
preferredSize.Height = Math.Max(preferredSize.Height, childSize.Height);
}
// Add on the control level padding
preferredSize.Width += _kryptonBreadCrumb.Padding.Horizontal;
preferredSize.Height += _kryptonBreadCrumb.Padding.Vertical;
return(preferredSize);
}
/// <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 need to update the redirector for drawing each crumb
PaletteRedirectBreadCrumb redirect = _kryptonBreadCrumb.GetRedirector() as PaletteRedirectBreadCrumb;
// We take on all the available display area
ClientRectangle = context.DisplayRectangle;
// Create/delete child elements to match the current selected bread crumb path
SyncBreadCrumbs();
// Positioning rectangle is our client rectangle reduced by control padding
Rectangle layoutRect = new(ClientLocation.X + _kryptonBreadCrumb.Padding.Left,
ClientLocation.Y + _kryptonBreadCrumb.Padding.Top,
ClientWidth - _kryptonBreadCrumb.Padding.Horizontal,
ClientHeight - _kryptonBreadCrumb.Padding.Vertical);
// Position from left to right all items except the overflow button
var offset = layoutRect.X;
for (var i = 1; i < Count; i++)
{
// Do not show the left border on the first crumb
redirect.Left = i == 0;
// Find size of the child
Size childSize = this[i].GetPreferredSize(context);
context.DisplayRectangle = new Rectangle(offset, layoutRect.Y, childSize.Width, layoutRect.Height);
// Position the child
this[i].Layout(context);
this[i].Visible = true;
// Move across
offset += childSize.Width;
}
// If we overflowed then we need to use the overflow button
if (offset > ClientWidth)
{
// Overflow button must be visible
this[0].Visible = true;
// How much space do we need to save?
var overflowed = offset - ClientWidth;
// Position overflow button and only the last items to fit space
offset = layoutRect.X;
for (var i = 0; i < Count; i++)
{
// Decide if the crumb (not the overflow button) can be visible
if (i > 0)
{
this[i].Visible = overflowed <= 0;
}
if (this[i].Visible)
{
// Do not show the left border on the first crumb
redirect.Left = i == 0;
// Recover the already calculated size
Size childSize = this[i].GetPreferredSize(context);
context.DisplayRectangle = new Rectangle(offset, layoutRect.Y, childSize.Width, layoutRect.Height);
// Position the child
this[i].Layout(context);
// Move across
offset += childSize.Width;
}
// Adjust overflow space depending on if we are positioning crumb or overflow
if (i != 0)
{
overflowed -= this[i].ClientWidth;
}
else
{
overflowed += this[i].ClientWidth;
}
}
}
else
{
// No overflow then no need for the overflow button
this[0].Visible = false;
}
// Must restore the display rectangle to the same size as when it entered
context.DisplayRectangle = ClientRectangle;
}
