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using System;
using System.Linq;
using System.Linq.Expressions;
using AppKit;
namespace Xamarin.PropertyEditing.Mac
{
public struct ConstraintProxy
{
public int Left, Top, Right, Bottom, Leading, Trailing, CenterX, CenterY, Baseline, Height, Width;
}
public static class ConstraintExtensions
{
public static NSLayoutConstraint[] ConstraintFill (this NSView child, NSView container, int padding = 0)
{
return new NSLayoutConstraint[] {
NSLayoutConstraint.Create (child, NSLayoutAttribute.Left, NSLayoutRelation.Equal, container, NSLayoutAttribute.Left, 1, padding),
NSLayoutConstraint.Create (child, NSLayoutAttribute.Right, NSLayoutRelation.Equal, container, NSLayoutAttribute.Right, 1, -padding),
NSLayoutConstraint.Create (child, NSLayoutAttribute.Top, NSLayoutRelation.Equal, container, NSLayoutAttribute.Top, 1, container.IsFlipped ? padding : -padding),
NSLayoutConstraint.Create (child, NSLayoutAttribute.Bottom, NSLayoutRelation.Equal, container, NSLayoutAttribute.Bottom, 1, container.IsFlipped ? -padding : 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 void DoConstraints (this NSView view, params NSLayoutConstraint[] constraints)
{
view.AddConstraints (constraints);
}
public static void DoMergedConstraints (this NSView view, params object[] constraints)
{
foreach (var o in constraints) {
var singleConstraint = o as NSLayoutConstraint;
var multipleConstraint = o as NSLayoutConstraint[];
if (singleConstraint != null)
view.AddConstraint (singleConstraint);
else if (multipleConstraint != null)
view.AddConstraints (multipleConstraint);
else
throw new ArgumentException ("Unexpected constraint type: " + o.GetType ());
}
}
public static NSLayoutConstraint SticksTo (this NSView child, NSView container, NSLayoutAttribute attribute, int padding = 0)
{
return NSLayoutConstraint.Create (child, attribute, NSLayoutRelation.Equal, container, attribute, 1, padding);
}
public static NSLayoutConstraint[] SticksTo (this NSView child, NSView container, params NSLayoutAttribute[] attributes)
{
return attributes
.Select (a => NSLayoutConstraint.Create (child, a, NSLayoutRelation.Equal, container, a, 1, 0))
.ToArray ();
}
public static NSLayoutConstraint WithPriority (this NSLayoutConstraint constraint, NSLayoutPriority priority)
{
return constraint.WithPriority ((float)priority);
}
public static NSLayoutConstraint WithPriority (this NSLayoutConstraint constraint, float priority)
{
constraint.Priority = priority;
return constraint;
}
}
}
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