protected override Size ArrangeOverride(Size finalSize)
{
foreach (UIElement child in Children)
{
var finalRect = new Rect(0.0, 0.0, _ViewportSize.Width, _ViewportSize.Height);
var positionRectangle = GetPositionRectangle(child);
if (positionRectangle is object)
{
finalRect = MapMath.LocationToViewportPoint(ref _NormalizedMercatorToViewport, positionRectangle);
}
else
{
var position = GetPosition(child);
if (position is object && MapMath.TryLocationToViewportPoint(ref _NormalizedMercatorToViewport, position, out var viewportPosition))
{
var positionOrigin = GetPositionOrigin(child);
viewportPosition.X -= positionOrigin.X * child.DesiredSize.Width;
viewportPosition.Y -= positionOrigin.Y * child.DesiredSize.Height;
finalRect = new Rect(viewportPosition.X, viewportPosition.Y, child.DesiredSize.Width, child.DesiredSize.Height);
}
}
var positionOffset = GetPositionOffset(child);
finalRect.X += positionOffset.X;
finalRect.Y += positionOffset.Y;
child.Arrange(finalRect);
}
return(_ViewportSize);
}
protected override Size MeasureOverride(Size availableSize)
{
foreach (UIElement child1 in Children)
{
var positionRectangle = GetPositionRectangle(child1);
if (positionRectangle is object)
{
var viewportPoint = MapMath.LocationToViewportPoint(ref _NormalizedMercatorToViewport, positionRectangle);
child1.Measure(new Size(viewportPoint.Width, viewportPoint.Height));
}
else
{
if (child1 is ContentPresenter && VisualTreeHelper.GetChildrenCount(child1) > 0)
{
if (VisualTreeHelper.GetChild(child1, 0) is IProjectable child2)
{
child2.SetView(_ViewportSize, _NormalizedMercatorToViewport, _ViewportToNormalizedMercator);
(child2 as UIElement)?.InvalidateMeasure();
}
}
(child1 as IProjectable)?.SetView(_ViewportSize, _NormalizedMercatorToViewport, _ViewportToNormalizedMercator);
child1.Measure(_ViewportSize);
}
}
return(_ViewportSize);
}