public static void UpdateConstraints(LayoutConstraintItem item, Action <ConstraintMaker> closure)
{
if (item.Constraints?.Length <= 0)
{
MakeConstraints(item, closure);
return;
}
var maker = new ConstraintMaker(item);
closure(maker);
var constraints = new List <Constraint>();
foreach (var description in maker._descriptions)
{
if (description.Constraint != null)
{
constraints.Add(description.Constraint);
}
}
foreach (var constraint in constraints)
{
constraint.ActivateIfNeeded(updateExisting: true);
}
}
public ConstraintMaker(LayoutConstraintItem item)
{
_item = item;
_item.Prepare();
_descriptions = new List <ConstraintDescription>();
}
public ConstraintDescription(LayoutConstraintItem item, ConstraintAttributes attributes)
{
Item = item;
Constant = 0.0f;
Priority = 1000.0f;
Multiplier = 1.0f;
Attributes = attributes;
}
public static void RemoveConstraints(LayoutConstraintItem item)
{
var constraints = item.Constraints;
foreach (var constraint in constraints)
{
constraint.DeactivateIfNeeded();
}
}
public static Constraint[] PrepareConstraints(LayoutConstraintItem item, Action <ConstraintMaker> closure)
{
var maker = new ConstraintMaker(item);
closure(maker);
var constraints = new List <Constraint>();
foreach (var description in maker._descriptions)
{
if (description.Constraint != null)
{
constraints.Add(description.Constraint);
}
}
return(constraints.ToArray());
}
public static void MakeConstraints(LayoutConstraintItem item, Action <ConstraintMaker> closure)
{
var maker = new ConstraintMaker(item);
closure(maker);
var constraints = new List <Constraint>();
foreach (var description in maker._descriptions)
{
if (description.Constraint != null)
{
constraints.Add(description.Constraint);
}
}
foreach (var constraint in constraints)
{
constraint.ActivateIfNeeded(updateExisting: false);
}
}
public LayoutConstraint(LayoutConstraintItem itemA, NSLayoutAttribute attributeA, NSLayoutRelation relation, UIView itemB, NSLayoutAttribute attributeB, nfloat multiplier, nfloat constant)
{
_value = NSLayoutConstraint.Create(itemA.Value, attributeA, relation, itemB, attributeB, multiplier, constant);
}
public static void RemakeConstraints(LayoutConstraintItem item, Action <ConstraintMaker> closure)
{
RemoveConstraints(item);
MakeConstraints(item, closure);
}