public FluentLayout(UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
float constant = 0f)
{
View = view;
Attribute = attribute;
Relation = relation;
Multiplier = 1f;
Constant = constant;
}
public FluentLayout(UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
float constant = 0f)
{
View = view;
Attribute = attribute;
Relation = relation;
Multiplier = 1f;
Constant = constant;
}
public FluentLayout(UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
nfloat constant = default(nfloat))
{
View = view;
Attribute = attribute;
Relation = relation;
Multiplier = 1f;
Constant = constant;
Priority = (float)UILayoutPriority.Required;
}
public FluentLayout(UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
nfloat constant = default(nfloat))
{
View = view;
Attribute = attribute;
Relation = relation;
Multiplier = 1f;
Constant = constant;
Priority = (float) UILayoutPriority.Required;
}
public FluentLayout(UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
nfloat constant = default(nfloat))
{
Constraint = new Lazy <NSLayoutConstraint>(CreateConstraint);
View = view;
Attribute = attribute;
Relation = relation;
Constant = constant;
Priority = (float)UILayoutPriority.Required;
}
public FluentLayout(
UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
NSObject secondItem,
NSLayoutAttribute secondAttribute)
{
View = view;
Attribute = attribute;
Relation = relation;
SecondItem = secondItem;
SecondAttribute = secondAttribute;
Multiplier = 1f;
}
public FluentLayout(
UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
NSObject secondItem,
NSLayoutAttribute secondAttribute)
{
View = view;
Attribute = attribute;
Relation = relation;
SecondItem = secondItem;
SecondAttribute = secondAttribute;
Multiplier = 1f;
}
public FluentLayout(
UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
NSObject secondItem,
NSLayoutAttribute secondAttribute)
{
View = view;
Attribute = attribute;
Relation = relation;
SecondItem = secondItem;
SecondAttribute = secondAttribute;
Multiplier = 1f;
Priority = (float) UILayoutPriority.Required;
}
public FluentLayout(
UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
NSObject secondItem,
NSLayoutAttribute secondAttribute)
{
Constraint = new Lazy <NSLayoutConstraint>(CreateConstraint);
View = view;
Attribute = attribute;
Relation = relation;
SecondItem = secondItem;
SecondAttribute = secondAttribute;
Priority = (float)UILayoutPriority.Required;
}
public FluentLayout(
UIView view,
NSLayoutAttribute attribute,
NSLayoutRelation relation,
NSObject secondItem,
NSLayoutAttribute secondAttribute)
{
View = view;
Attribute = attribute;
Relation = relation;
SecondItem = secondItem;
SecondAttribute = secondAttribute;
Multiplier = 1f;
Priority = (float)UILayoutPriority.Required;
}
public static NSLayoutConstraint [] PinTopRight(NSView view, NSView superView, float padding, NSLayoutRelation relation)
{
return(new NSLayoutConstraint []
{
NSLayoutConstraint.Create(view, NSLayoutAttribute.Right, relation, superView, NSLayoutAttribute.Right, 1.0f, padding),
NSLayoutConstraint.Create(view, NSLayoutAttribute.Top, relation, superView, NSLayoutAttribute.Top, 1.0f, padding)
});
}
public static NSLayoutConstraint SetCenterYContraintTo(this UIView childView, UIView superView, float margin = 0, NSLayoutRelation relation = NSLayoutRelation.Equal, int priority = 1000)
{
var constraint = NSLayoutConstraint.Create(superView, NSLayoutAttribute.CenterY, relation, childView, NSLayoutAttribute.CenterY, 1, margin);
constraint.Priority = priority;
superView.AddConstraint(constraint);
return(constraint);
}
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);
}
// This solves the duplicate selector export problem while not breaking the API.
public static NSLayoutConstraint Create(NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation,
NSObject view2, NSLayoutAttribute attribute2, nfloat multiplier, nfloat constant)
{
return Create ((INativeObject) view1, attribute1, relation, view2, attribute2, multiplier, constant);
}
/// <summary>
/// A helper function that create a new constraint, add to given view and return the parent constraint to continue the chain method.
/// </summary>
private ParentConstraint AddNewConstraintToParent(UIView view, NSLayoutAttribute viewAttribute, NSLayoutRelation relation, UIView target, NSLayoutAttribute targetAttribute, float multiplier, float constant, float priority)
{
// create a new constraint
var constraint = NSLayoutConstraint.Create(view, viewAttribute, relation, target, targetAttribute, multiplier, constant);
constraint.Priority = priority;
// add the new constraint to parent
target.AddConstraint(constraint);
// continue the chain
return(this);
}
public static NSLayoutConstraint PinFirstBaseline(NSView view, NSView superView, float padding, NSLayoutRelation relation)
{
return(NSLayoutConstraint.Create(view, NSLayoutAttribute.FirstBaseline, relation, superView, NSLayoutAttribute.FirstBaseline, 1.0f, padding));
}
public static NSLayoutConstraint Create(NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation)
{
return(NSLayoutConstraint.Create(view1, attribute1, relation, null, NSLayoutAttribute.NoAttribute, 1.0f, 0f));
}
public static void SetCenterXContraintTo(this UIView childView, UIView superView, float margin = 0, NSLayoutRelation relation = NSLayoutRelation.Equal)
{
superView.AddConstraint(NSLayoutConstraint.Create(
superView,
NSLayoutAttribute.CenterX,
relation,
childView,
NSLayoutAttribute.CenterX,
1,
margin));
}
internal LayoutConstraint[] AddConstraint(ICompound from, ICompound to = null, Coefficients[] coefficients = null, NSLayoutRelation relation = default(NSLayoutRelation))
{
var results = new List <LayoutConstraint>();
for (var i = 0; i < from.Properties.Length; i++)
{
var n = coefficients?[i] ?? new Coefficients();
results.Add(AddConstraint(from.Properties[i], to: to?.Properties?[i], coefficients: n, relation: relation));
}
return(results.ToArray());
}
internal LayoutConstraint AddConstraint(IProperty from, IProperty to = null, Coefficients coefficients = null, NSLayoutRelation relation = default(NSLayoutRelation))
{
if (coefficients == null)
{
coefficients = new Coefficients();
}
from.View.TranslatesAutoresizingMaskIntoConstraints = false;
var constraint = NSLayoutConstraint.Create(
from.View,
from.Attribute,
relation,
to?.View,
to?.Attribute ?? NSLayoutAttribute.NoAttribute,
coefficients.Multiplier,
coefficients.Constant
);
if (to == null)
{
_constraints.Add(new Constraint(from.View, constraint));
}
else
{
var common = from.View.ClosestCommonAncestor(to.View);
if (common != null)
{
_constraints.Add(new Constraint(common, constraint));
}
else
{
throw new Exception($"No common superview found between ${from.View} and ${to.View}");
}
}
return(constraint);
}
internal LayoutConstraint AddConstraint(IProperty from, LayoutSupport to, Coefficients coefficients = null, NSLayoutRelation relation = default(NSLayoutRelation))
{
if (coefficients == null)
{
coefficients = new Coefficients();
}
from.View.TranslatesAutoresizingMaskIntoConstraints = false;
var constraint = NSLayoutConstraint.Create(
from.View,
from.Attribute,
relation,
to.LayoutGuide,
to.Attribute,
coefficients.Multiplier,
coefficients.Constant
);
var view = from.View;
while (view?.Superview != null)
{
view = view.Superview;
}
_constraints.Add(new Constraint(view, constraint));
return(constraint);
}
public NSLayoutConstraint(AnyObject item, NSLayoutAttribute attribute2, NSLayoutRelation relatedBy, [Optional] AnyObject toItem, NSLayoutAttribute attribute, CGFloat multiplier, CGFloat constant)
{
}
/// <summary>
/// Create a new height constraint with given parent view where the contraint should be added.
/// Use this only if the view is not under the same parent view.
/// </summary>
public ParentConstraint HeightToParent(NSLayoutRelation relation, UIView target, NSLayoutAttribute attribute, float multiplier = 1f, float constant = 0f, float priority = Priority.Required)
{
return(AddNewConstraintToParent(View, NSLayoutAttribute.Height, relation, target, attribute, multiplier, constant, priority));
}
public static NSLayoutConstraint Create(NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation, nfloat multiplier, nfloat constant)
{
return(NSLayoutConstraint.Create(view1, attribute1, relation, null, NSLayoutAttribute.NoAttribute, multiplier, constant));
}
public static bool GenerateConstraint(this UIView view1, NSLayoutAttribute attribute1, NSLayoutRelation relation, UIView view2, NSLayoutAttribute attribute2, nfloat multiplier, nfloat constant)
{
NSLayoutConstraint constraint = view1.Constraints.Where(c => c.FirstAttribute == attribute1).FirstOrDefault();
if (constraint != null)
{
view1.RemoveConstraint(constraint);
}
constraint = NSLayoutConstraint.Create(view1, attribute1, relation, view2, attribute2, multiplier, constant);
constraint.Active = true;
view1.AddConstraint(constraint);
view1.UpdateConstraints();
return(true);
}
public static NSLayoutConstraint PinRight(NSView view, NSView superView, float padding, NSLayoutRelation relation)
{
return(NSLayoutConstraint.Create(view, NSLayoutAttribute.Right, relation, superView, NSLayoutAttribute.Right, 1.0f, padding));
}
public static NSLayoutConstraint ConstraintTo(this NSView view1, NSView view2, Expression <Func <ConstraintProxy, ConstraintProxy, bool> > expression)
{
var mainExpression = expression.Body as BinaryExpression;
NSLayoutRelation relation = NSLayoutRelation.Equal;
switch (mainExpression.NodeType)
{
case ExpressionType.Equal:
relation = NSLayoutRelation.Equal;
break;
case ExpressionType.LessThanOrEqual:
relation = NSLayoutRelation.LessThanOrEqual;
break;
case ExpressionType.GreaterThanOrEqual:
relation = NSLayoutRelation.GreaterThanOrEqual;
break;
default:
throw new ArgumentException("Relation " + mainExpression.NodeType.ToString() + " not valid");
}
var propLeft = (NSLayoutAttribute)Enum.Parse(typeof(NSLayoutAttribute), ((MemberExpression)mainExpression.Left).Member.Name);
var propRight = propLeft;
if (mainExpression.Right.NodeType == ExpressionType.Constant)
{
var c = Convert.ToSingle(((ConstantExpression)mainExpression.Right).Value);
// Console.WriteLine ("NSLayoutConstraint.Create ({0}, NSLayoutAttribute.{1}, NSLayoutRelation.{2}, {3}, NSLayoutAttribute.{4}, {5}f, {6}f),", view1, propLeft, relation, null, propRight, 1, c);
return(NSLayoutConstraint.Create(view1, propLeft, relation, null, NSLayoutAttribute.NoAttribute, 1, c));
}
else if (mainExpression.Right is MemberExpression)
{
propRight = (NSLayoutAttribute)Enum.Parse(typeof(NSLayoutAttribute), ((MemberExpression)mainExpression.Right).Member.Name);
// Console.WriteLine ("NSLayoutConstraint.Create ({0}, NSLayoutAttribute.{1}, NSLayoutRelation.{2}, {3}, NSLayoutAttribute.{4}, {5}f, {6}f),", view1, propLeft, relation, view2, propRight, 1, 0);
return(NSLayoutConstraint.Create(view1, propLeft, relation, view2, propRight, 1, 0));
}
var addNode = mainExpression.Right as BinaryExpression;
var mulNode = addNode;
var constant = 0f;
var multiplier = 1f;
if (addNode.Left.NodeType == ExpressionType.Constant)
{
mulNode = addNode.Right as BinaryExpression;
constant = Convert.ToSingle(((ConstantExpression)addNode.Left).Value);
}
else
{
mulNode = addNode.Left as BinaryExpression;
constant = Convert.ToSingle(((ConstantExpression)addNode.Right).Value);
}
constant *= addNode.NodeType == ExpressionType.Subtract ? -1 : 1;
if (mulNode != null)
{
if (mulNode.Left.NodeType == ExpressionType.Constant)
{
multiplier = Convert.ToSingle(((ConstantExpression)mulNode.Left).Value);
propRight = (NSLayoutAttribute)Enum.Parse(typeof(NSLayoutAttribute), ((MemberExpression)mulNode.Right).Member.Name);
}
else
{
multiplier = Convert.ToSingle(((ConstantExpression)mulNode.Right).Value);
propRight = (NSLayoutAttribute)Enum.Parse(typeof(NSLayoutAttribute), ((MemberExpression)mulNode.Left).Member.Name);
}
if (mulNode.NodeType == ExpressionType.Divide)
{
multiplier = 1.0f / multiplier;
}
}
else
{
var member = (MemberExpression)(addNode.Right is MemberExpression ? addNode.Right : addNode.Left);
propRight = (NSLayoutAttribute)Enum.Parse(typeof(NSLayoutAttribute), member.Member.Name);
}
// Console.WriteLine ("NSLayoutConstraint.Create ({0}, NSLayoutAttribute.{1}, NSLayoutRelation.{2}, {3}, NSLayoutAttribute.{4}, {5}f, {6}f),", view1, propLeft, relation, view2, propRight, multiplier, constant);
return(NSLayoutConstraint.Create(view1, propLeft, relation, view2, propRight, multiplier, constant));
}
public static NSLayoutConstraint [] PinBottomLeft(NSView view, NSView superView, float padding, NSLayoutRelation relation)
{
return(new NSLayoutConstraint []
{
NSLayoutConstraint.Create(view, NSLayoutAttribute.Left, relation, superView, NSLayoutAttribute.Left, 1.0f, padding),
NSLayoutConstraint.Create(view, NSLayoutAttribute.Bottom, relation, superView, NSLayoutAttribute.Bottom, 1.0f, padding)
});
}
/// <summary>
/// Create a new width constraint.
/// </summary>
public ParentConstraint Width(NSLayoutRelation relation, NSObject target, NSLayoutAttribute attribute, float multiplier = 1f, float constant = 0f, float priority = Priority.Required)
{
return(AddNewConstraint(View, NSLayoutAttribute.Width, relation, target, attribute, multiplier, constant, priority));
}
public static NSLayoutConstraint Create (NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation, nfloat multiplier, nfloat constant)
{
return NSLayoutConstraint.Create (view1, attribute1, relation, null, NSLayoutAttribute.NoAttribute, multiplier, constant);
}
public static NSLayoutConstraint Create (NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation)
{
return NSLayoutConstraint.Create (view1, attribute1, relation, null, NSLayoutAttribute.NoAttribute, 1.0f, 0f);
}
// This solves the duplicate selector export problem while not breaking the API.
public static NSLayoutConstraint Create(NSObject view1, NSLayoutAttribute attribute1, NSLayoutRelation relation,
NSObject view2, NSLayoutAttribute attribute2, nfloat multiplier, nfloat constant)
{
return(Create((INativeObject)view1, attribute1, relation, view2, attribute2, multiplier, constant));
}
public static UIView WithConstraint(this UIView constrainedView, UIView view1, NSLayoutAttribute attribute1, NSLayoutRelation relation, UIView view2, NSLayoutAttribute attribute2, nfloat multiplier, nfloat constant, [CallerMemberName] string identifier = "", float?priority = null)
{
if (view1 != null && view1 != constrainedView)
{
view1.TranslatesAutoresizingMaskIntoConstraints = false;
}
if (view2 != null && view2 != constrainedView)
{
view2.TranslatesAutoresizingMaskIntoConstraints = false;
}
var constraint = NSLayoutConstraint.Create(view1, attribute1, relation, view2, attribute2, multiplier, constant);
if (!string.IsNullOrEmpty(identifier))
{
constraint.SetIdentifier(identifier);
}
if (priority.HasValue)
{
constraint.Priority = priority.Value;
}
constrainedView.AddConstraint(constraint);
return(constrainedView);
}
