public Size Measure(FormsLayoutInfo info)
{
var desiredHeight = 0.0;
var childrenSize = new Size(info.Size.Width, double.PositiveInfinity);
foreach (var child in info.Children)
{
child.Measure(childrenSize);
desiredHeight += child.DesiredSize.Height;
}
return new Size(info.Size.Width, desiredHeight);
}
private double ArrangeChildren(FormsLayoutInfo info, int start, int to, double childXPosition, double childWidth, bool useInstantAnimation)
{
var currentHeight = 0.0;
for (int i = start; i < to; i++)
{
var child = info.Children[i];
var childHeight = child.DesiredSize.Height;
var animationDuration = useInstantAnimation ? ZeroAnimationDuration : DefaultAnimationDuration;
ArrangeChildFluently(child, new Point(childXPosition, currentHeight), new Size(childWidth, childHeight), animationDuration);
currentHeight += childHeight;
}
return currentHeight;
}
public Size Measure(FormsLayoutInfo info)
{
if (info.Children.Count == 0)
return new Size(info.Size.Width, 0.0);
var childWidth = info.Size.Width / 2.0;
var childSize = new Size(childWidth, double.PositiveInfinity);
var leftColumnCount = Math.Min(info.Children.Count, info.BreakOnItem);
var firstColumnSize = MeasureChildren(info.Children, 0, leftColumnCount, childSize);
var secondColumnSize = MeasureChildren(info.Children, info.BreakOnItem, info.Children.Count, childSize);
var finalHeight = Math.Max(firstColumnSize, secondColumnSize);
return new Size(info.Size.Width, finalHeight);
}
public Size Arrange(FormsLayoutInfo info, bool useInstantAnimation)
{
using (BeginStoryboard())
{
var currentHeight = 0.0;
foreach (var child in info.Children)
{
var desiredChildHeight = child.DesiredSize.Height;
var animationDuration = useInstantAnimation ? ZeroAnimationDuration : DefaultAnimationDuration;
ArrangeChildFluently(child, new Point(0.0, currentHeight), new Size(info.Size.Width, desiredChildHeight), animationDuration);
currentHeight += desiredChildHeight;
}
return new Size(info.Size.Width, currentHeight);
}
}
public Size Arrange(FormsLayoutInfo info, bool useInstantAnimation)
{
if (info.Children.Count == 0)
return new Size(info.Size.Width, 0.0);
var childWidth = info.Size.Width / 2.0;
var leftColumnCount = Math.Min(info.Children.Count, info.BreakOnItem);
using (BeginStoryboard())
{
var firstColumnHeight = ArrangeChildren(info, 0, leftColumnCount, 0.0, childWidth, useInstantAnimation);
var secondColumnHeight = ArrangeChildren(info, info.BreakOnItem, info.Children.Count, childWidth, childWidth, useInstantAnimation);
var finalHeight = Math.Max(firstColumnHeight, secondColumnHeight);
return new Size(info.Size.Width, finalHeight);
}
}
private double ArrangeRightColumnChildren(FormsLayoutInfo info, int start, int to, double childXPosition, double childWidth, bool useInstantAnimation)
{
var currentHeight = 0.0;
for (int i = start; i < to; i++)
{
var child = info.Children[i];
var childHeight = child.DesiredSize.Height;
var animationDuration = useInstantAnimation ? ZeroAnimationDuration : DefaultAnimationDuration;
var nextAnchorPoint = GetNextAnchorPoint(currentHeight);
if (nextAnchorPoint.HasValue && nextAnchorPoint.Value < currentHeight + childHeight)
currentHeight = nextAnchorPoint.Value;
ArrangeChildFluently(child, new Point(childXPosition, currentHeight), new Size(childWidth, childHeight), animationDuration);
currentHeight += childHeight;
}
_firstColumnAnchorPoints.Clear();
return currentHeight;
}
