void ArrangeSlot(SlotData slotData, Point upperLeft, Size finalSize)
{
UVHelper uv = UVHelper.CreateInstance(slotData.Slot.Orientation);
Point runningUpperLeft = upperLeft;
double maxU = uv.U(runningUpperLeft) + uv.U(finalSize);
bool addSizer = false;
Slot previousSlot = null;
foreach (var child in slotData.Slot.Children)
{
if (addSizer)
{
SlotSizer sizer = GetNextSizer();
sizer.SizeDirection = slotData.Slot.Orientation;
sizer.Slot1 = previousSlot;
sizer.Slot2 = child;
sizer.Measure(uv.Size(SlotSpacing, uv.V(finalSize)));
sizer.Arrange(new Rect(uv.Point(uv.U(runningUpperLeft), uv.V(runningUpperLeft)), uv.Size(SlotSpacing, uv.V(finalSize))));
runningUpperLeft = uv.Point(Math.Min(maxU, uv.U(runningUpperLeft) + SlotSpacing), uv.V(runningUpperLeft));
}
var childSlot = slotTable[InternalGetSlotName(child)];
var childFinalSize = uv.Size(Math.Min(uv.U(finalSize), uv.U(childSlot.FinalSize)), uv.V(finalSize));
ArrangeSlot(childSlot, runningUpperLeft, childFinalSize);
runningUpperLeft = uv.Point(Math.Min(maxU, uv.U(runningUpperLeft) + uv.U(childFinalSize)), uv.V(runningUpperLeft));
addSizer = (SlotSpacing > 0);
previousSlot = child;
}
if (slotData.Elements != null)
{
foreach (UIElement element in slotData.Elements)
{
element.Arrange(new Rect(upperLeft, finalSize));
}
}
slotData.Slot.ActualSize = finalSize;
slotData.Slot.UpperLeft = upperLeft;
}
void MeasureSlot(SlotData slotData, Size availableSize)
{
UVHelper uv = UVHelper.CreateInstance(slotData.Slot.Orientation);
// Measure all 'auto' and 'absolute' children; add up the * values as we go.
double totalU = 0, maxV = 0;
double totalStars = 0;
bool addPad = false;
foreach (var child in slotData.Slot.Children)
{
var length = child.Length;
var childSlot = slotTable[InternalGetSlotName(child)];
if (addPad)
{
totalU += SlotSpacing;
}
if (length.IsAuto)
{
var childU = Math.Max(Math.Min(uv.U(availableSize), childSlot.Slot.MaxLength), childSlot.Slot.MinLength);
var childAvailableSize = uv.Size(childU, uv.V(availableSize));
MeasureSlot(childSlot, childAvailableSize);
childSlot.FinalSize = childSlot.DesiredSize;
totalU += uv.U(childSlot.FinalSize);
maxV = Math.Max(maxV, uv.V(childSlot.FinalSize));
}
else if (length.IsAbsolute)
{
var childU = Math.Max(Math.Min(length.Value, childSlot.Slot.MaxLength), childSlot.Slot.MinLength);
MeasureSlot(childSlot, uv.Size(childU, uv.V(availableSize)));
childSlot.FinalSize = uv.Size(childU, uv.V(childSlot.DesiredSize));
totalU += childU;
maxV = Math.Max(maxV, uv.V(childSlot.FinalSize));
}
else
{
totalStars += length.Value;
}
addPad = (SlotSpacing > 0);
}
// Now measure the * values.
double spaceLeft = Math.Max(uv.U(availableSize) - totalU, 0);
List <Slot> slots = (from child in slotData.Slot.Children where child.Length.IsStar select child).ToList();
List <Slot> proportional = new List <Slot>();
// Determined the size for stars that are over the min or max length
int constrained;
do
{
constrained = 0;
for (int idx = 0; idx < slots.Count; idx++)
{
Slot child = slots[idx];
var childSlot = slotTable[InternalGetSlotName(child)];
var childU = (spaceLeft / totalStars) * child.Length.Value;
if (childU < childSlot.Slot.MinLength)
{
spaceLeft -= childSlot.Slot.MinLength - childU;
childU = childSlot.Slot.MinLength;
}
else if (childU > childSlot.Slot.MaxLength)
{
spaceLeft += childSlot.Slot.MaxLength - childU;
childU = childSlot.Slot.MaxLength;
}
else
{
proportional.Add(child);
continue;
}
constrained++;
var childAvailableSize = uv.Size(Math.Max(0, childU), uv.V(availableSize));
MeasureSlot(childSlot, childAvailableSize);
childSlot.FinalSize = uv.Size(MaxNonInfinite(childU, uv.U(childSlot.DesiredSize)), uv.V(childSlot.DesiredSize));
totalU += uv.U(childSlot.FinalSize);
maxV = Math.Max(maxV, uv.V(childSlot.FinalSize));
}
slots = proportional;
proportional = new List <Slot>();
} while (slots.Count > 0 && constrained > 0);
// Determine the size of remaining star children
foreach (var child in slots)
{
var childSlot = slotTable[InternalGetSlotName(child)];
var childU = (spaceLeft / totalStars) * child.Length.Value;
var childAvailableSize = uv.Size(Math.Max(0, childU), uv.V(availableSize));
MeasureSlot(childSlot, childAvailableSize);
childSlot.FinalSize = uv.Size(MaxNonInfinite(childU, uv.U(childSlot.DesiredSize)), uv.V(childSlot.DesiredSize));
totalU += uv.U(childSlot.FinalSize);
maxV = Math.Max(maxV, uv.V(childSlot.FinalSize));
}
// Finally, measure any child elements we have
if (slotData.Elements != null)
{
foreach (var e in slotData.Elements)
{
e.Measure(availableSize);
totalU = Math.Max(totalU, uv.U(e.DesiredSize));
maxV = Math.Max(maxV, uv.V(e.DesiredSize));
}
}
slotData.DesiredSize = uv.Size(totalU, maxV);
}
