public Size Measure(float width, float height)
{
var finalSize = Size.Zero;
for (var i = 0; i < _views.Length; i++)
{
var size = _scope.Measure(ref _views[i], width, height);
if (size.Width > finalSize.Width)
{
finalSize.Width = size.Width;
}
finalSize.Height += _spacing;
finalSize.Height += size.Width;
}
finalSize.Height -= _spacing;
return(finalSize);
}
protected override Windows.Foundation.Size MeasureOverride(Windows.Foundation.Size availableSize)
{
var scope = new LayoutScope <UIElement>(LayoutAdapter.Instance);
var root = LayoutHandler?.Invoke(scope);
if (root != null)
{
var size = scope.Measure(root.Value, (float)availableSize.Width, (float)availableSize.Height);
return(new Windows.Foundation.Size(size.Width, size.Height));
}
return(base.MeasureOverride(availableSize));
}
private void MeasureColumns(float width, float height)
{
var columns = (GridColumnDefinition[])_grid.Columns;
var unknownSize = width - _grid.KnownWidth;
for (var i = 0; i < columns.Length; i++)
{
_columnWidths[i] = (columns[i].Type == GridUnitType.Pixel) ? columns[i].Width : 0;
}
for (var span = 1; span <= _maxColumnSpan; span++)
{
for (var cursor = 0; cursor <= columns.Length - span; cursor++)
{
var lastUnknownCursor = -1;
for (var i = cursor + span - 1; i >= cursor; i--)
{
if (columns[i].Type != GridUnitType.Pixel)
{
lastUnknownCursor = i;
break;
}
}
if (lastUnknownCursor == -1)
{
continue;
}
var measureSize = _columnWidths[cursor];
for (var i = cursor + 1; i < cursor + span; i++)
{
measureSize += _columnWidths[i];
}
measureSize += unknownSize;
var spanSize = 0.0f;
for (var i = 0; i < _views.Length; i++)
{
if (_views[i].ColumnSpan == span && _views[i].Column == cursor)
{
var size = _scope.Measure(ref _views[i].View, measureSize, height);
if (size.Width > spanSize)
{
spanSize = size.Width;
}
}
}
if (spanSize > 0)
{
for (var i = cursor; i < cursor + span; i++)
{
if (i != lastUnknownCursor)
{
spanSize -= _columnWidths[i];
}
}
var original = _columnWidths[lastUnknownCursor];
_columnWidths[lastUnknownCursor] = spanSize;
unknownSize -= (spanSize - original);
}
}
}
}
