Reworked layout system

Material.xcodeproj/project.pbxproj

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 		9D39A81B20FE8ED100BA8FA1 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D39A81A20FE8ED100BA8FA1 /* ViewController.swift */; };
+		9D494A38217F6B63003D66F1 /* LayoutAttribute.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D494A37217F6B63003D66F1 /* LayoutAttribute.swift */; };
+		9D494A3A217F6B70003D66F1 /* LayoutAnchor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D494A39217F6B70003D66F1 /* LayoutAnchor.swift */; };
+		9D494A3C217F6B7D003D66F1 /* LayoutConstraint.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D494A3B217F6B7D003D66F1 /* LayoutConstraint.swift */; };
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@@ -300,6 +303,9 @@
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 		9D39A81A20FE8ED100BA8FA1 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
+		9D494A37217F6B63003D66F1 /* LayoutAttribute.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LayoutAttribute.swift; sourceTree = "<group>"; };
+		9D494A39217F6B70003D66F1 /* LayoutAnchor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LayoutAnchor.swift; sourceTree = "<group>"; };
+		9D494A3B217F6B7D003D66F1 /* LayoutConstraint.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LayoutConstraint.swift; sourceTree = "<group>"; };
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@@ -652,6 +658,9 @@
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 			children = (
 			children = (
 				96BCB7811CB40DC500C806FE /* Layout.swift */,
 				96BCB7811CB40DC500C806FE /* Layout.swift */,
+				9D494A39217F6B70003D66F1 /* LayoutAnchor.swift */,
+				9D494A37217F6B63003D66F1 /* LayoutAttribute.swift */,
+				9D494A3B217F6B7D003D66F1 /* LayoutConstraint.swift */,
 			);
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 			name = Layout;
 			name = Layout;
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@@ -993,6 +1002,7 @@
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 				9DF352461FED210000B2A11B /* CheckButton.swift in Sources */,
 				965E810A1DD4D5C800D61E4B /* Font.swift in Sources */,
 				965E810A1DD4D5C800D61E4B /* Font.swift in Sources */,
 				965E810B1DD4D5C800D61E4B /* RobotoFont.swift in Sources */,
 				965E810B1DD4D5C800D61E4B /* RobotoFont.swift in Sources */,
+				9D494A3C217F6B7D003D66F1 /* LayoutConstraint.swift in Sources */,
 				965E810C1DD4D5C800D61E4B /* DynamicFontType.swift in Sources */,
 				965E810C1DD4D5C800D61E4B /* DynamicFontType.swift in Sources */,
 				965E81101DD4D5C800D61E4B /* NavigationBar.swift in Sources */,
 				965E81101DD4D5C800D61E4B /* NavigationBar.swift in Sources */,
 				965E81111DD4D5C800D61E4B /* NavigationController.swift in Sources */,
 				965E81111DD4D5C800D61E4B /* NavigationController.swift in Sources */,
@@ -1015,6 +1025,7 @@
 				965E81211DD4D5C800D61E4B /* TextStorage.swift in Sources */,
 				965E81211DD4D5C800D61E4B /* TextStorage.swift in Sources */,
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 				965E81221DD4D5C800D61E4B /* TextView.swift in Sources */,
 				965E80E71DD4C55200D61E4B /* Material+UIView.swift in Sources */,
 				965E80E71DD4C55200D61E4B /* Material+UIView.swift in Sources */,
+				9D494A38217F6B63003D66F1 /* LayoutAttribute.swift in Sources */,
 				96B8D22D20CF82D5008BD149 /* FABMenu.swift in Sources */,
 				96B8D22D20CF82D5008BD149 /* FABMenu.swift in Sources */,
 				965E80E81DD4C55200D61E4B /* Material+CALayer.swift in Sources */,
 				965E80E81DD4C55200D61E4B /* Material+CALayer.swift in Sources */,
 				965E80E91DD4C55200D61E4B /* Material+String.swift in Sources */,
 				965E80E91DD4C55200D61E4B /* Material+String.swift in Sources */,
@@ -1054,6 +1065,7 @@
 				965E80D21DD4C50600D61E4B /* Color.swift in Sources */,
 				965E80D21DD4C50600D61E4B /* Color.swift in Sources */,
 				96BFC1541E5E486F0075DE1F /* SpringAnimation.swift in Sources */,
 				96BFC1541E5E486F0075DE1F /* SpringAnimation.swift in Sources */,
 				9D054A6620D175AC00D0528D /* Material+UILabel.swift in Sources */,
 				9D054A6620D175AC00D0528D /* Material+UILabel.swift in Sources */,
+				9D494A3A217F6B70003D66F1 /* LayoutAnchor.swift in Sources */,
 				965E80D31DD4C50600D61E4B /* Device.swift in Sources */,
 				965E80D31DD4C50600D61E4B /* Device.swift in Sources */,
 				965E80FD1DD4D59500D61E4B /* Toolbar.swift in Sources */,
 				965E80FD1DD4D59500D61E4B /* Toolbar.swift in Sources */,
 				965E80D41DD4C50600D61E4B /* Divider.swift in Sources */,
 				965E80D41DD4C50600D61E4B /* Divider.swift in Sources */,

Sources/iOS/LayoutAnchor.swift

+/*
+ * Copyright (C) 2015 - 2018, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ *  * Neither the name of CosmicMind nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import UIKit
+
+public struct LayoutAnchor {
+  /// A weak reference to the view.
+  weak var view: UIView?
+  
+  /// An array of LayoutAttribute for the view.
+  let attributes: [LayoutAttribute]
+  
+  /**
+   An initializer taking view and anchor attributes.
+   - Parameter view: A UIView.
+   - Parameter attributes: An array of LayoutAtrribute.
+  */
+  init(view: UIView?, attributes: [LayoutAttribute]) {
+    self.view = view
+    self.attributes = attributes
+  }
+}
+
+public extension Layout {
+  /// A layout anchor representing top of the view.
+  var top: LayoutAnchor {
+    return attribute(.top)
+  }
+  
+  /// A layout anchor representing bottom of the view.
+  var bottom: LayoutAnchor {
+    return attribute(.bottom)
+  }
+  
+  /// A layout anchor representing left of the view.
+  var left: LayoutAnchor {
+    return attribute(.left)
+  }
+  
+  /// A layout anchor representing right of the view.
+  var right: LayoutAnchor {
+    return attribute(.right)
+  }
+  
+  /// A layout anchor representing top-left of the view.
+  var topLeft: LayoutAnchor {
+    return attribute(.topLeft)
+  }
+  
+  /// A layout anchor representing top-right of the view.
+  var topRight: LayoutAnchor {
+    return attribute(.topRight)
+  }
+  
+  /// A layout anchor representing bottom-left of the view.
+  var bottomLeft: LayoutAnchor {
+    return attribute(.bottomLeft)
+  }
+  
+  /// A layout anchor representing bottom-right of the view.
+  var bottomRight: LayoutAnchor {
+    return attribute(.bottomRight)
+  }
+  
+  /// A layout anchor representing top and bottom of the view.
+  var topBottom: LayoutAnchor {
+    return attribute(.topBottom)
+  }
+  
+  /// A layout anchor representing left and right of the view.
+  var leftRight: LayoutAnchor {
+    return attribute(.leftRight)
+  }
+  
+  /// A layout anchor representing center of the view.
+  var center: LayoutAnchor {
+    return attribute(.center)
+  }
+  
+  /// A layout anchor representing horizontal center of the view.
+  var centerX: LayoutAnchor {
+    return attribute(.centerX)
+  }
+  
+  /// A layout anchor representing vertical center of the view.
+  var centerY: LayoutAnchor {
+    return attribute(.centerY)
+  }
+  
+  /// A layout anchor representing top, left, bottom and right of the view.
+  var edges: LayoutAnchor {
+    return attribute(.edges)
+  }
+  
+  /// A layout anchor representing width of the view.
+  var width: LayoutAnchor {
+    return attribute(.width)
+  }
+  /// A layout anchor representing height of the view.
+  var height: LayoutAnchor {
+    return attribute(.height)
+  }
+}
+
+private extension Layout {
+  /**
+   Creates LayoutAnchor with the given attribute.
+   - Parameter attribute: A LayoutAttribute.
+   - Returns: A LayoutAnchor.
+   */
+  func attribute(_ attribute: LayoutAttribute) -> LayoutAnchor {
+    return LayoutAnchor(view: view, attributes: [attribute])
+  }
+  
+  /**
+   Creates LayoutAnchor with the given attributes.
+   - Parameter attributes: An array of LayoutAttribute.
+   - Returns: A LayoutAnchor.
+   */
+  func attribute(_ attributes: [LayoutAttribute]) -> LayoutAnchor {
+    return LayoutAnchor(view: view, attributes: attributes)
+  }
+}

Sources/iOS/LayoutAttribute.swift

+/*
+ * Copyright (C) 2015 - 2018, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ *  * Neither the name of CosmicMind nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import UIKit
+
+/// A typealias for NSLayoutConstraint.Attribute
+internal typealias LayoutAttribute = NSLayoutConstraint.Attribute
+
+internal extension Array where Element == LayoutAttribute {
+  /// A LayoutAttribute array containing top and left.
+  static var topLeft: [LayoutAttribute] {
+    return [.top, .left]
+  }
+  
+  /// A LayoutAttribute array containing top and right.
+  static var topRight: [LayoutAttribute] {
+    return [.top, .right]
+  }
+  
+  /// A LayoutAttribute array containing bottom and left.
+  static var bottomLeft: [LayoutAttribute] {
+    return [.bottom, .left]
+  }
+  
+  /// A LayoutAttribute array containing bottom and right.
+  static var bottomRight: [LayoutAttribute] {
+    return [.bottom, .right]
+  }
+  
+  /// A LayoutAttribute array containing left and right.
+  static var leftRight: [LayoutAttribute] {
+    return [.left, .right]
+  }
+  
+  /// A LayoutAttribute array containing top and bottom.
+  static var topBottom: [LayoutAttribute] {
+    return [.top, .bottom]
+  }
+  
+  /// A LayoutAttribute array containing centerX and centerY.
+  static var center: [LayoutAttribute] {
+    return [.centerX, .centerY]
+  }
+  
+  /// A LayoutAttribute array containing top, left, bottom and right.
+  static var edges: [LayoutAttribute] {
+    return [.top, .left, .bottom, .right]
+  }
+  
+  /// A LayoutAttribute array for constant height.
+  static var constantHeight: [LayoutAttribute] {
+    return [.height, .notAnAttribute]
+  }
+  
+  /// A LayoutAttribute array for constant width.
+  static var constantWidth: [LayoutAttribute] {
+    return [.width, .notAnAttribute]
+  }
+}

Sources/iOS/LayoutConstraint.swift

+/*
+ * Copyright (C) 2015 - 2018, Daniel Dahan and CosmicMind, Inc. <http://cosmicmind.com>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ *  * Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ *  * Neither the name of CosmicMind nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+import UIKit
+
+internal struct LayoutConstraint {
+  /// `From` anchor for the constraint.
+  private let fromAnchor: LayoutAnchor
+  
+  /// `To` anchor for the constraint.
+  private let toAnchor: LayoutAnchor
+  
+  /// An array of constants for the constraint.
+  private var constants: [CGFloat]
+  
+  /**
+   An initializer taking `from` and `to` anchors and constants for the constraint.
+   - Parameter fromAnchor: A LayoutAnchor.
+   - Parameter toAnchor: A LayoutAnchor.
+   - Parameter constants: An array of CGFloat.
+   */
+  init(fromAnchor: LayoutAnchor, toAnchor: LayoutAnchor, constants: [CGFloat]) {
+    self.fromAnchor = fromAnchor
+    self.toAnchor = toAnchor
+    self.constants = constants
+  }
+}
+
+internal extension LayoutConstraint {
+  /// Creates an array of NSLayoutConstraint from a LayoutConstraint.
+  var constraints: [NSLayoutConstraint] {
+    guard fromAnchor.attributes.count == toAnchor.attributes.count else {
+      fatalError("[Material Error: The number of attributes of anchors does not match.]")
+    }
+    
+    guard fromAnchor.attributes.count == constants.count else {
+      fatalError("[Material Error: The number of constants does not match the number of constraints.]")
+    }
+    
+    var v: [NSLayoutConstraint] = []
+    
+    zip(zip(fromAnchor.attributes, toAnchor.attributes), constants).forEach {
+      v.append(NSLayoutConstraint(item: fromAnchor.view as Any,
+                                  attribute: $0.0,
+                                  relatedBy: .equal,
+                                  toItem: toAnchor.view,
+                                  attribute: $0.1,
+                                  multiplier: 1,
+                                  constant: $1))
+    }
+    
+    
+    return v
+  }
+}