Added Theme

Material.xcodeproj/project.pbxproj

@@ -170,6 +170,7 @@
 		96E3C39A1D3A1CC20086A024 /* ErrorTextField.swift in Headers */ = {isa = PBXBuildFile; fileRef = 961F18E71CD93E3E008927C5 /* ErrorTextField.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		96E3C39C1D3A1CC20086A024 /* Offset.swift in Headers */ = {isa = PBXBuildFile; fileRef = 968C99461D377849000074FF /* Offset.swift */; settings = {ATTRIBUTES = (Public, ); }; };
 		96F1A5531F24F17A001D8CAF /* TabsController.swift in Headers */ = {isa = PBXBuildFile; fileRef = 96E09DC71F2287E50000B121 /* TabsController.swift */; settings = {ATTRIBUTES = (Public, ); }; };
+		9D00EBB4216675FB00DBCD69 /* Theme.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D00EBB3216675FB00DBCD69 /* Theme.swift */; };
 		9D054A6520D175AC00D0528D /* Material+UIButton.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D054A6320D175AC00D0528D /* Material+UIButton.swift */; };
 		9D054A6620D175AC00D0528D /* Material+UILabel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D054A6420D175AC00D0528D /* Material+UILabel.swift */; };
 		9D39A81B20FE8ED100BA8FA1 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D39A81A20FE8ED100BA8FA1 /* ViewController.swift */; };
@@ -292,6 +293,7 @@
 		96E09DC71F2287E50000B121 /* TabsController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TabsController.swift; sourceTree = "<group>"; };
 		96E3C3931D397AE90086A024 /* Material+UIView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Material+UIView.swift"; sourceTree = "<group>"; };
 		96F1DC871D654FDF0025F925 /* Material+CALayer.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Material+CALayer.swift"; sourceTree = "<group>"; };
+		9D00EBB3216675FB00DBCD69 /* Theme.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Theme.swift; sourceTree = "<group>"; };
 		9D054A6320D175AC00D0528D /* Material+UIButton.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Material+UIButton.swift"; sourceTree = "<group>"; };
 		9D054A6420D175AC00D0528D /* Material+UILabel.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Material+UILabel.swift"; sourceTree = "<group>"; };
 		9D39A81A20FE8ED100BA8FA1 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -567,6 +569,7 @@
 				963FBF011D6696AB008F8512 /* Tab */,
 				966ECF2B1CF4C21B00BB0BDF /* Table */,
 				96090B031D9D709E00709CA6 /* Text */,
+				9D00EBB2216675A800DBCD69 /* Theme */,
 				963FBF001D66964F008F8512 /* Toolbar */,
 				9626CA951DAB5370003E2611 /* Transition */,
 				96BCB8061CB40FD000C806FE /* Type */,
@@ -760,6 +763,14 @@
 			name = Animation;
 			sourceTree = "<group>";
 		};
+		9D00EBB2216675A800DBCD69 /* Theme */ = {
+			isa = PBXGroup;
+			children = (
+				9D00EBB3216675FB00DBCD69 /* Theme.swift */,
+			);
+			name = Theme;
+			sourceTree = "<group>";
+		};
 		9DE84D6E1FF0250E00586C8B /* ButtonGroup */ = {
 			isa = PBXGroup;
 			children = (
@@ -1002,6 +1013,7 @@
 				966C17731F0439F600D3E83C /* Material+MotionAnimation.swift in Sources */,
 				965E80E51DD4C53300D61E4B /* PulseAnimation.swift in Sources */,
 				9DE84D721FF0252600586C8B /* RadioButtonGroup.swift in Sources */,
+				9D00EBB4216675FB00DBCD69 /* Theme.swift in Sources */,
 				965E80FE1DD4D59500D61E4B /* ToolbarController.swift in Sources */,
 				96328B971E05C0BB009A4C90 /* TableView.swift in Sources */,
 				965E80F81DD4D59500D61E4B /* ImageCard.swift in Sources */,

Sources/iOS/Theme.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
+import Motion
+
+public protocol Themeable {
+  func apply(theme: Theme)
+}
+
+public struct Theme {
+  /// The color displayed most frequently across the app.
+  public var primary = Color.blue.base
+  
+  /// Accent color for some components such as FABMenu.
+  public var secondary = Color.blue.base
+  
+  /// Background color for view controllers and some components.
+  public var background = Color.white
+  
+  /// Background color for components such as cards, and dialogs.
+  public var surface = Color.white
+  
+  /// Error color for components such as ErrorTextField.
+  public var error = Color.red.base
+  
+  
+  /// Text and iconography color to be used on primary color.
+  public var onPrimary = Color.white
+  
+  /// Text and iconography color to be used on secondary color.
+  public var onSecondary = Color.white
+  
+  /// Text and iconography color to be used on background color.
+  public var onBackground = Color.black
+  
+  /// Text and iconography color to be used on surface color.
+  public var onSurface = Color.black
+  
+  /// Text and iconography color to be used on error color.
+  public var onError = Color.white
+}
+
+public extension Theme {
+  /// Current theme for Material.
+  static var current = Theme.light {
+    didSet {
+      guard let v = Application.rootViewController else {
+        return
+      }
+      
+      apply(theme: .current, to: v)
+    }
+  }
+  
+  /// A light theme.
+  static var light = Theme()
+  
+  /// A dark theme.
+  static var dark: Theme = {
+    var t = Theme()
+    t.primary = UIColor(rgb: 0x202020)
+    t.secondary = UIColor(rgb: 0x33776B)
+    t.background = UIColor(rgb: 0x303030)
+    t.onBackground = .white
+    return t
+  }()
+  
+  /**
+   Applies theme to the hierarchy of given view.
+   - Parameter theme: A Theme.
+   - Parameter to view: A UIView.
+   */
+  static func apply(theme: Theme, to view: UIView) {
+    (view as? Themeable)?.apply(theme: theme)
+    
+    view.subviews.forEach {
+      apply(theme: theme, to: $0)
+    }
+  }
+  
+  /**
+   Applies theme to the hierarchy of given view controller.
+   - Parameter theme: A Theme.
+   - Parameter to viewController: A UIViewController.
+   */
+  static func apply(theme: Theme, to viewController: UIViewController) {
+    apply(theme: theme, to: viewController.view)
+    (viewController as? Themeable)?.apply(theme: theme)
+    
+    viewController.children.forEach {
+      apply(theme: theme, to: $0)
+    }
+  }
+}