internal override void ComputeConstraintForView(View view)
{
LayoutOptions vOptions = view.VerticalOptions;
LayoutOptions hOptions = view.HorizontalOptions;
var result = LayoutConstraint.None;
if (vOptions.Alignment == LayoutAlignment.Fill)
{
result |= LayoutConstraint.VerticallyFixed;
}
if (hOptions.Alignment == LayoutAlignment.Fill)
{
result |= LayoutConstraint.HorizontallyFixed;
}
view.ComputedConstraint = result;
}
internal override void ComputeConstraintForView(View view)
{
LayoutOptions vOptions = view.VerticalOptions;
LayoutOptions hOptions = view.HorizontalOptions;
var result = LayoutConstraint.None;
// grab a snapshot of this grid's structure for computing the constraints
var structure = new GridStructure(this);
if (vOptions.Alignment == LayoutAlignment.Fill)
{
int row = GetRow(view);
int rowSpan = GetRowSpan(view);
List <RowDefinition> rowDefinitions = structure.Rows;
var canFix = true;
for (int i = row; i < row + rowSpan && i < rowDefinitions.Count; i++)
{
GridLength height = rowDefinitions[i].Height;
if (height.IsAuto)
{
canFix = false;
break;
}
if ((Constraint & LayoutConstraint.VerticallyFixed) == 0 && height.IsStar)
{
canFix = false;
break;
}
}
if (canFix)
{
result |= LayoutConstraint.VerticallyFixed;
}
}
if (hOptions.Alignment == LayoutAlignment.Fill)
{
int col = GetColumn(view);
int colSpan = GetColumnSpan(view);
List <ColumnDefinition> columnDefinitions = structure.Columns;
var canFix = true;
for (int i = col; i < col + colSpan && i < columnDefinitions.Count; i++)
{
GridLength width = columnDefinitions[i].Width;
if (width.IsAuto)
{
canFix = false;
break;
}
if ((Constraint & LayoutConstraint.HorizontallyFixed) == 0 && width.IsStar)
{
canFix = false;
break;
}
}
if (canFix)
{
result |= LayoutConstraint.HorizontallyFixed;
}
}
view.ComputedConstraint = result;
}
