private double Sort(FlexElementCollection elements, FlexDistributeDirection direction)
{
ArrayUtils.EnsureArrayLength(ref _sortedElements, elements.Count, false);
ArrayUtils.EnsureArrayLength(ref _sortedIndex, elements.Count, false);
_actualCount = 0;
var fixedLength = 0.0;
for (var index = elements.Count - 1; index >= 0; index--)
{
var item = elements[index];
if (item.CanDistribute(direction) == false)
{
fixedLength += item.ActualLength;
continue;
}
_sortedElements[_actualCount] = item;
_sortedIndex[_actualCount] = index;
_actualCount++;
}
Array.Sort(_sortedElements, _sortedIndex, 0, _actualCount, FlexItemComparer.Default);
_currentCount = _actualCount;
return(fixedLength);
}
public bool CanDistribute(FlexDistributeDirection direction)
{
if (StretchDirection == FlexStretchDirection.None && IsStar == false)
{
return(false);
}
if (direction == FlexDistributeDirection.Expand)
{
return(ActualLength < MaxLength && (CanExpand || IsStar));
}
return(ActualLength > MinLength && (CanShrink || IsStar));
}
private void Distribute(FlexElementCollection elements, FlexDistributeDirection direction, double target)
{
ArrayUtils.EnsureArrayLength(ref _index, elements.Count, false);
_priorityStack.Clear();
_priorityStack.Push(0);
foreach (var flexItem in elements)
{
var priority = flexItem.GetPriority(direction);
if (priority > _priorityStack.Peek())
{
_priorityStack.Push(priority);
}
}
while (_priorityStack.Count > 0)
{
var priority = _priorityStack.Pop();
_elementsCopy.EnsureCount(elements.Count);
_elementsCopy.UseLayoutRounding = elements.UseLayoutRounding;
var currentTarget = target;
var j = 0;
for (var i = 0; i < elements.Count; i++)
{
var flexItem = elements[i];
if (flexItem.GetPriority(direction) < priority)
{
currentTarget -= flexItem.ActualLength;
continue;
}
_index[j] = i;
_elementsCopy[j] = flexItem;
j++;
}
_elementsCopy.EnsureCount(j);
currentTarget = Math.Max(0, currentTarget);
if (direction == FlexDistributeDirection.Expand)
{
ExpandAllImpl(_elementsCopy, currentTarget);
}
else
{
ShrinkAllImpl(_elementsCopy, currentTarget);
}
for (var i = 0; i < _elementsCopy.Count; i++)
{
var flexItem = _elementsCopy[i];
var index = _index[i];
elements[index] = flexItem;
}
if (elements.Actual.IsCloseTo(target))
{
return;
}
}
}
