Improve Priority API's

SnapKit.xcodeproj/project.pbxproj

@@ -33,6 +33,7 @@
 		EE235FC31C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FBF1C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift */; };
 		EE235FC81C5785E200C08960 /* ConstraintView+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE235FC61C5785E200C08960 /* ConstraintView+Extensions.swift */; };
 		EE4910991B19A40200A54F1F /* SnapKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = EEBCC9D819CC627D0083B827 /* SnapKit.framework */; };
+		EE6087751E4F133E0029CF84 /* ConstraintPriority.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE6087741E4F133E0029CF84 /* ConstraintPriority.swift */; };
 		EE6898CB1DA7B3A100D47F33 /* LayoutConstraintItem.swift in Sources */ = {isa = PBXBuildFile; fileRef = EE6898CA1DA7B3A100D47F33 /* LayoutConstraintItem.swift */; };
 		EECDB3741AC0C9B6006BBC11 /* SnapKit.h in Headers */ = {isa = PBXBuildFile; fileRef = EECDB3661AC0C95C006BBC11 /* SnapKit.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		EECDB3931AC0CB52006BBC11 /* Tests.swift in Sources */ = {isa = PBXBuildFile; fileRef = EECDB36A1AC0C95C006BBC11 /* Tests.swift */; };
@@ -71,6 +72,7 @@
 		EE235FBE1C5785DC00C08960 /* ConstraintViewDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintViewDSL.swift; sourceTree = "<group>"; };
 		EE235FBF1C5785DC00C08960 /* ConstraintLayoutSupportDSL.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintLayoutSupportDSL.swift; sourceTree = "<group>"; };
 		EE235FC61C5785E200C08960 /* ConstraintView+Extensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "ConstraintView+Extensions.swift"; sourceTree = "<group>"; };
+		EE6087741E4F133E0029CF84 /* ConstraintPriority.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ConstraintPriority.swift; sourceTree = "<group>"; };
 		EE6898CA1DA7B3A100D47F33 /* LayoutConstraintItem.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = LayoutConstraintItem.swift; sourceTree = "<group>"; };
 		EE94F6081AC0F10A008767FF /* UIKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = UIKit.framework; path = System/Library/Frameworks/UIKit.framework; sourceTree = SDKROOT; };
 		EE94F60A1AC0F10F008767FF /* AppKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AppKit.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/AppKit.framework; sourceTree = DEVELOPER_DIR; };
@@ -187,6 +189,7 @@
 				EE235F6B1C5785C600C08960 /* ConstraintItem.swift */,
 				EE235F6C1C5785C600C08960 /* LayoutConstraint.swift */,
 				EE6898CA1DA7B3A100D47F33 /* LayoutConstraintItem.swift */,
+				EE6087741E4F133E0029CF84 /* ConstraintPriority.swift */,
 			);
 			name = Models;
 			sourceTree = "<group>";
@@ -365,6 +368,7 @@
 				EE235FB51C5785D400C08960 /* ConstraintMakerEditable.swift in Sources */,
 				EEF68FBC1D78653000980C26 /* ConstraintLayoutGuide.swift in Sources */,
 				EE235FAC1C5785D400C08960 /* ConstraintMaker.swift in Sources */,
+				EE6087751E4F133E0029CF84 /* ConstraintPriority.swift in Sources */,
 				EE235F941C5785CE00C08960 /* ConstraintRelatableTarget.swift in Sources */,
 				EEF68FA61D784A5300980C26 /* ConstraintDSL.swift in Sources */,
 				EE235FBB1C5785D400C08960 /* ConstraintMakerExtendable.swift in Sources */,

Source/Constraint.swift

@@ -242,7 +242,7 @@ public final class Constraint {
             let attribute = (layoutConstraint.secondAttribute == .notAnAttribute) ? layoutConstraint.firstAttribute : layoutConstraint.secondAttribute
             layoutConstraint.constant = self.constant.constraintConstantTargetValueFor(layoutAttribute: attribute)
 
-            let requiredPriority = ConstraintMakerPriortizable.Priority.required.rawValue
+            let requiredPriority = ConstraintPriority.required.value
             if (layoutConstraint.priority < requiredPriority), (self.priority.constraintPriorityTargetValue != requiredPriority) {
                 layoutConstraint.priority = self.priority.constraintPriorityTargetValue
             }

Source/ConstraintMakerPriortizable.swift

@@ -30,90 +30,39 @@
 
 public class ConstraintMakerPriortizable: ConstraintMakerFinalizable {
     
-    public enum Priority: Strideable, RawRepresentable, Equatable {
-        case low
-        case medium
-        case high
-        case required
-        case custom(value: Float)
-        
-        public init?(rawValue: Float) {
-            if rawValue < 0 || rawValue > 1000 {
-                return nil
-            }
-            
-            self = .custom(value: rawValue)
-        }
-        
-        private var macOSMedium: Float {
-            #if os(OSX)
-            return 501.0
-            #else
-            return 500.0
-            #endif
-        }
-        
-        public var rawValue: Float {
-            switch self {
-            case .low:
-                return 250.0
-            case .medium:
-                return macOSMedium
-            case .high:
-                return 750.0
-            case .required:
-                return 1000.0
-            case let .custom(value):
-                return value
-            }
-        }
-        
-        public func advanced(by n: Float) -> Priority {
-            return .custom(value: self.rawValue + n)
-        }
-        
-        public func distance(to other: Priority) -> Float {
-            return other.rawValue - self.rawValue
-        }
-        
-        public static func ==(lhs: Priority, rhs: Priority) -> Bool {
-            return lhs.rawValue == rhs.rawValue
-        }
+    @discardableResult
+    public func priority(_ amount: ConstraintPriority) -> ConstraintMakerFinalizable {
+        self.description.priority = amount.value
+        return self
     }
     
     @discardableResult
-    @available(*, deprecated:3.0, message:"Use priority(level: .custom(Float)) instead.")
     public func priority(_ amount: ConstraintPriorityTarget) -> ConstraintMakerFinalizable {
         self.description.priority = amount
         return self
     }
     
-    @discardableResult
-    public func priority(level: Priority) -> ConstraintMakerFinalizable {
-        return self.priority(level: ConstraintMakerPriortizable.Priority(rawValue: level.rawValue)!)
-    }
-    
-    @available(*, deprecated:3.0, message:"Use priority(level: Priority) instead.")
+    @available(*, deprecated:3.0, message:"Use priority(.required) instead.")
     @discardableResult
     public func priorityRequired() -> ConstraintMakerFinalizable {
-        return self.priority(level: .required)
+        return self.priority(.required)
     }
     
-    @available(*, deprecated:3.0, message:"Use priority(level: Priority) instead.")
+    @available(*, deprecated:3.0, message:"Use priority(.high) instead.")
     @discardableResult
     public func priorityHigh() -> ConstraintMakerFinalizable {
-        return self.priority(level: .high)
+        return self.priority(.high)
     }
     
-    @available(*, deprecated:3.0, message:"Use priority(level: Priority) instead.")
+    @available(*, deprecated:3.0, message:"Use priority(.medium) instead.")
     @discardableResult
     public func priorityMedium() -> ConstraintMakerFinalizable {
-        return self.priority(level: .medium)
+        return self.priority(.medium)
     }
     
-    @available(*, deprecated:3.0, message:"Use priority(level: Priority) instead.")
+    @available(*, deprecated:3.0, message:"Use priority(.low) instead.")
     @discardableResult
     public func priorityLow() -> ConstraintMakerFinalizable {
-        return self.priority(level: .low)
+        return self.priority(.low)
     }
 }

Source/ConstraintPriority.swift

@@ -0,0 +1,64 @@
+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public struct ConstraintPriority : ExpressibleByFloatLiteral {
+    public typealias FloatLiteralType = Float
+    
+    public let value: FloatLiteralType
+    
+    public init(floatLiteral value: FloatLiteralType) {
+        self.value = value
+    }
+    
+    public init(_ value: Float) {
+        self.value = value
+    }
+    
+    public static var required: ConstraintPriority {
+        return 1000.0
+    }
+    
+    public static var high: ConstraintPriority {
+        return 750.0
+    }
+    
+    public static var medium: ConstraintPriority {
+        #if os(OSX)
+            return 501.0
+        #else
+            return 500.0
+        #endif
+        
+    }
+    
+    public static var low: ConstraintPriority {
+        return 250.0
+    }
+}