ViewConstraint offset methods

Snappy/CompositeConstraint.swift

@@ -70,12 +70,12 @@ class CompositeConstraint: Constraint, ConstraintDelegate {
         return self
     }
     
-    func insets(insets: Any) -> Constraint {
+    func offset(offset: Any) -> Constraint {
         return self
     }
     
-    func offset(offset: Any) -> Constraint {
-        return self
+    func insets(insets: UIEdgeInsets) -> Constraint {
+        return self;
     }
     
     func multipliedBy(multiplier: Float) -> Constraint {

Snappy/Constraint.swift

@@ -41,7 +41,7 @@ typealias Delegate = ConstraintDelegate?
     
     func lessThanOrEqualTo(attr: Any) -> Constraint
     
-    func insets(insets: Any) -> Constraint
+    func insets(insets: UIEdgeInsets) -> Constraint
     
     func offset(offset: Any) -> Constraint
     

Snappy/ViewConstraint.swift

@@ -17,15 +17,18 @@ class ViewConstraint: Constraint {
     var layoutPriority = 1000.0// UILayoutPriorityRequired gives error?!
     var layoutMultiplier = 1.0
     var layoutConstraint: NSLayoutConstraint?
-    var layoutRelation = NSLayoutRelation.Equal
-    var layoutConstant = 0.0
-    var hasLayoutRelation = false;
+    var layoutRelation: NSLayoutRelation?
+    var layoutConstant: Float
     
     weak var delegate: ConstraintDelegate?
     
     init(view: View, firstViewAttribute: ViewAttribute)  {
         self.view = view;
         self.firstViewAttribute = firstViewAttribute;
+        
+        self.layoutPriority = 1000.0// UILayoutPriorityRequired gives error?!
+        self.layoutMultiplier = 1.0
+        self.layoutConstant = 0.0
     }
     
     var left: Constraint { return addConstraint(.Left) }
@@ -43,20 +46,112 @@ class ViewConstraint: Constraint {
     var and: Constraint { return self }
     var with: Constraint { return self }
     
-    func addConstraint(NSLayoutAttribute) -> Constraint {
+    func addConstraint(attr: NSLayoutAttribute) -> Constraint {
+        if (self.layoutRelation) {
+            //TODO use assert
+            println("Attributes should be chained before defining the constraint relation")
+        }
+        
+        return self.delegate!.constraint(self, addConstraintWithLayoutAttribute:attr)
+    }
+    
+    func equality(relation: NSLayoutRelation, attr: Any) -> Constraint {
+        layoutRelation = relation
+        
+        switch attr {
+        case let view as View:
+            secondViewAttribute = ViewAttribute(view: firstViewAttribute.view, layoutAttribute: firstViewAttribute.layoutAttribute)
+        case let offset as Float:
+            layoutConstant = offset
+        case let number as NSNumber:
+            layoutConstant = number
+        case let viewAttribute as ViewAttribute:
+            secondViewAttribute = viewAttribute
+        case let size as CGSize:
+            sizeOffset(size)
+        case let point as CGPoint:
+            centerOffset(point)
+        case let inset as UIEdgeInsets:
+            insets(inset)
+        default:
+            println("unsupported value: \(attr)")
+        }
+      
+//        } else if (strcmp(value.objCType, @encode(CGPoint)) == 0) {
+//            CGPoint point;
+//            [value getValue:&point];
+//            self.centerOffset = point;
+//        } else if (strcmp(value.objCType, @encode(CGSize)) == 0) {
+//            CGSize size;
+//            [value getValue:&size];
+//            self.sizeOffset = size;
+//        } else if (strcmp(value.objCType, @encode(MASEdgeInsets)) == 0) {
+//            MASEdgeInsets insets;
+//            [value getValue:&insets];
+//            self.insets = insets;
+//        } else {
+//            NSAssert(NO, @"attempting to set layout constant with unsupported value: %@", value);
+//        }
+        
+        return self;
+    }
+    
+    private func sizeOffset(size: CGSize) {
+        switch (firstViewAttribute.layoutAttribute) {
+        case .Width:
+            layoutConstant = Float(size.width);
+            break;
+        case .Height:
+            layoutConstant = Float(size.height);
+            break;
+        default:
+            break;
+        }
+    }
+    
+    private func centerOffset(point: CGPoint) {
+        switch (firstViewAttribute.layoutAttribute) {
+        case .CenterX:
+            layoutConstant = Float(point.x);
+            break;
+        case .CenterY:
+            layoutConstant = Float(point.y);
+            break;
+        default:
+            break;
+        }
+    }
+    
+    func insets(insets: UIEdgeInsets) -> Constraint {
+        switch (firstViewAttribute.layoutAttribute) {
+        case .Left:
+            layoutConstant = Float(insets.left);
+            break;
+        case .Top:
+            layoutConstant = Float(insets.top);
+            break;
+        case .Bottom:
+            layoutConstant = Float(-insets.bottom);
+            break;
+        case .Right:
+            layoutConstant = Float(-insets.right);
+            break;
+        default:
+            break;
+        }
         return self;
     }
     
     func equalTo(attr: Any) -> Constraint {
-        return self
+        return equality(.Equal, attr: attr)
     }
     
     func greaterThanOrEqualTo(attr: Any) -> Constraint {
-        return self
+        return equality(.GreaterThanOrEqual, attr: attr)
     }
     
     func lessThanOrEqualTo(attr: Any) -> Constraint {
-        return self
+        return equality(.LessThanOrEqual, attr: attr)
     }
     
     func insets(insets: Any) -> Constraint {

SnappyExample/ViewController.swift

@@ -35,35 +35,35 @@ class ViewController: UIViewController {
         
         let padding = UIEdgeInsets(top: 15, left: 10, bottom: 15, right: 10)
         
-        view1.mas_makeConstraints({ make in
-            make.top.and.left.greaterThanOrEqualTo(superview).insets(padding);
+        view1.mas_makeConstraints { make in
+            make.top.and.left.greaterThanOrEqualTo(superview).insets(padding)
             
-            make.bottom.equalTo(view3.mas_top).insets(padding);
-            make.right.equalTo(view2.mas_left).insets(padding);
-            make.width.equalTo(view2.mas_width);
+            make.bottom.equalTo(view3.mas_top).insets(padding)
+            make.right.equalTo(view2.mas_left).insets(padding)
+            make.width.equalTo(view2.mas_width)
             
-            make.height.equalTo([view2, view3]);
-        });
+            make.height.equalTo([view2, view3])
+        }
         
-        view2.mas_makeConstraints({ make in
+        view2.mas_makeConstraints { make in
             // chain attributes
-            make.top.and.right.equalTo(superview).insets(padding);
+            make.top.and.right.equalTo(superview).insets(padding)
             
-            make.left.equalTo(view1.mas_right).insets(padding);
-            make.bottom.equalTo(view3.mas_top).insets(padding);
-            make.width.equalTo(view1.mas_width);
+            make.left.equalTo(view1.mas_right).insets(padding)
+            make.bottom.equalTo(view3.mas_top).insets(padding)
+            make.width.equalTo(view1.mas_width)
             
-            make.height.equalTo([view1, view3]);
-        });
+            make.height.equalTo([view1, view3])
+        }
         
-        view3.mas_makeConstraints({ make in
-            make.top.equalTo(view1.mas_bottom).insets(padding);
+        view3.mas_makeConstraints { make in
+            make.top.equalTo(view1.mas_bottom).insets(padding)
             
             // chain attributes
-            make.left.right.and.bottom.equalTo(superview).insets(padding);
+            make.left.right.and.bottom.equalTo(superview).insets(padding)
             
-            make.height.equalTo([view1, view2]);
-        });
+            make.height.equalTo([view1, view2])
+        }
         
     }