/// <summary>
/// Returns a constraint like "this", but with the given relation "r".
/// </summary>
/// <returns></returns>
public LinearConstraint /*!*/ ChangeRelation(ConstraintRelation rel)
{
Contract.Ensures(Contract.Result <LinearConstraint>() != null);
if (Relation == rel)
{
return(this);
}
else
{
LinearConstraint z = new LinearConstraint(rel);
z.coefficients = (Hashtable)this.coefficients.Clone();
z.rhs = this.rhs;
return(z);
}
}
public static NSLayoutRelation LayoutRelation(this ConstraintRelation @this)
{
switch (@this)
{
default:
case ConstraintRelation.Equal:
return(NSLayoutRelation.Equal);
case ConstraintRelation.LessThanOrEqual:
return(NSLayoutRelation.LessThanOrEqual);
case ConstraintRelation.GreaterThanOrEqual:
return(NSLayoutRelation.GreaterThanOrEqual);
}
}
internal ConstraintMakerEditable RelatedTo(ConstraintRelatableTarget other, ConstraintRelation relation, string file, uint line)
{
var related = (ConstraintItem)null;
var constant = (ConstraintConstantTarget)null;
if (other.Value is UIView)
{
constant = 0.0f;
related = new ConstraintItem(other.Value, ConstraintAttributes.None);
}
else if (other.Value is ConstraintItem)
{
constant = 0.0f;
related = (ConstraintItem)other.Value;
}
else if (other.Value is ConstraintLayoutGuide)
{
constant = 0.0f;
related = new ConstraintItem(other.Value, ConstraintAttributes.None);
}
else if (other.Value is ConstraintConstantTarget)
{
constant = (ConstraintConstantTarget)other.Value;
related = new ConstraintItem(null, ConstraintAttributes.None);
}
else
{
Console.WriteLine($"[ERROR] -- Invalid constraint. {file}:{line}");
}
var editable = new ConstraintMakerEditable(Description);
editable.Description.SourceLocation = new Tuple <string, uint>(file, line);
editable.Description.Relation = relation;
editable.Description.Related = related;
editable.Description.Constant = constant;
return(editable);
}
public LinearConstraint(ConstraintRelation rel) {
Relation = rel;
}
/// <summary>
/// Returns a constraint like "this", but with the given relation "r".
/// </summary>
/// <returns></returns>
public LinearConstraint/*!*/ ChangeRelation(ConstraintRelation rel) {
Contract.Ensures(Contract.Result<LinearConstraint>() != null);
if (Relation == rel) {
return this;
} else {
LinearConstraint z = new LinearConstraint(rel);
z.coefficients = (Hashtable)this.coefficients.Clone();
z.rhs = this.rhs;
return z;
}
}
public LinearConstraint(ConstraintRelation rel)
{
Relation = rel;
}
public Constraint(ConstraintItem from, ConstraintItem to, ConstraintRelation relation, Tuple <string, uint> sourceLocation, ConstraintMultiplierTarget multiplier, ConstraintConstantTarget constant, ConstraintPriorityTarget priority, string label = null)
{
_to = to;
_from = from;
_relation = relation;
_constant = constant;
_priority = priority;
_multiplier = multiplier;
_constraints = new List <LayoutConstraint>();
Label = label;
SourceLocation = sourceLocation;
var layoutFrom = _from.LayoutConstraintItem;
var layoutRelation = _relation.LayoutRelation();
var layoutToAttributes = _to.Attributes.LayoutAttributes();
var layoutFromAttributes = _from.Attributes.LayoutAttributes();
foreach (var layoutFromAttribute in layoutFromAttributes)
{
var layoutToAttribute = default(NSLayoutAttribute);
if (layoutToAttributes?.Length > 0)
{
if (_from.Attributes == ConstraintAttributes.Edges &&
_to.Attributes == ConstraintAttributes.Margins)
{
switch (layoutFromAttribute)
{
case NSLayoutAttribute.Top:
layoutToAttribute = NSLayoutAttribute.TopMargin;
break;
case NSLayoutAttribute.Left:
layoutToAttribute = NSLayoutAttribute.LeftMargin;
break;
case NSLayoutAttribute.Bottom:
layoutToAttribute = NSLayoutAttribute.BottomMargin;
break;
case NSLayoutAttribute.Right:
layoutToAttribute = NSLayoutAttribute.RightMargin;
break;
default:
throw new InvalidOperationException();
}
}
else if (_from.Attributes == ConstraintAttributes.Margins &&
_to.Attributes == ConstraintAttributes.Edges)
{
switch (layoutFromAttribute)
{
case NSLayoutAttribute.TopMargin:
layoutToAttribute = NSLayoutAttribute.Top;
break;
case NSLayoutAttribute.LeftMargin:
layoutToAttribute = NSLayoutAttribute.Left;
break;
case NSLayoutAttribute.BottomMargin:
layoutToAttribute = NSLayoutAttribute.Bottom;
break;
case NSLayoutAttribute.RightMargin:
layoutToAttribute = NSLayoutAttribute.Right;
break;
default:
throw new InvalidOperationException();
}
}
else if (_from.Attributes == _to.Attributes)
{
layoutToAttribute = layoutFromAttribute;
}
else
{
layoutToAttribute = layoutToAttributes[0];
}
}
else
{
if (_to.Target == null && (layoutFromAttribute == NSLayoutAttribute.CenterX || layoutFromAttribute == NSLayoutAttribute.CenterY))
{
layoutToAttribute = ((layoutFromAttribute == NSLayoutAttribute.CenterX) ? NSLayoutAttribute.Left : NSLayoutAttribute.Top);
}
else
{
layoutToAttribute = layoutFromAttribute;
}
}
var layoutConstant = _constant.ValueForAttribute(layoutToAttribute);
var layoutTo = _to.Target;
if (layoutTo == null &&
layoutToAttribute != NSLayoutAttribute.Width &&
layoutToAttribute != NSLayoutAttribute.Height)
{
layoutTo = layoutFrom.Superview;
}
// Create layout constraint
var layoutConstraint = new LayoutConstraint(
layoutFrom,
layoutFromAttribute,
layoutRelation,
(UIView)layoutTo,
layoutToAttribute,
_multiplier,
layoutConstant
);
// Set label
layoutConstraint.Label = Label;
// Set priority
layoutConstraint.Priority = _priority;
// Set constraint
layoutConstraint.Constraint = this;
// Append
_constraints.Add(layoutConstraint);
}
}
