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Pods/Kingfisher/Sources/ImageTransition.swift 4.19 KB
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d774f0637   Trịnh Văn Quân   fisrt comit 
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  //
  //  ImageTransition.swift
  //  Kingfisher
  //
  //  Created by Wei Wang on 15/9/18.
  //
  //  Copyright (c) 2017 Wei Wang <onevcat@gmail.com>
  //
  //  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(macOS)
  // Not implemented for macOS and watchOS yet.
      
  import AppKit
  
  /// Image transition is not supported on macOS.
  public enum ImageTransition {
      case none
      var duration: TimeInterval {
          return 0
      }
  }
  
  #elseif os(watchOS)
  import UIKit
  /// Image transition is not supported on watchOS.
  public enum ImageTransition {
      case none
      var duration: TimeInterval {
          return 0
      }
  }
  #else
  import UIKit
  
  /**
  Transition effect which will be used when an image downloaded and set by `UIImageView` extension API in Kingfisher.
  You can assign an enum value with transition duration as an item in `KingfisherOptionsInfo` 
  to enable the animation transition.
  
  Apple's UIViewAnimationOptions is used under the hood.
  For custom transition, you should specified your own transition options, animations and 
  comletion handler as well.
  */
  public enum ImageTransition {
      ///  No animation transistion.
      case none
      
      /// Fade in the loaded image.
      case fade(TimeInterval)
  
      /// Flip from left transition.
      case flipFromLeft(TimeInterval)
  
      /// Flip from right transition.
      case flipFromRight(TimeInterval)
      
      /// Flip from top transition.
      case flipFromTop(TimeInterval)
      
      /// Flip from bottom transition.
      case flipFromBottom(TimeInterval)
      
      /// Custom transition.
      case custom(duration: TimeInterval,
                   options: UIViewAnimationOptions,
                animations: ((UIImageView, UIImage) -> Void)?,
                completion: ((Bool) -> Void)?)
      
      var duration: TimeInterval {
          switch self {
          case .none:                          return 0
          case .fade(let duration):            return duration
              
          case .flipFromLeft(let duration):    return duration
          case .flipFromRight(let duration):   return duration
          case .flipFromTop(let duration):     return duration
          case .flipFromBottom(let duration):  return duration
              
          case .custom(let duration, _, _, _): return duration
          }
      }
      
      var animationOptions: UIViewAnimationOptions {
          switch self {
          case .none:                         return []
          case .fade(_):                      return .transitionCrossDissolve
              
          case .flipFromLeft(_):              return .transitionFlipFromLeft
          case .flipFromRight(_):             return .transitionFlipFromRight
          case .flipFromTop(_):               return .transitionFlipFromTop
          case .flipFromBottom(_):            return .transitionFlipFromBottom
              
          case .custom(_, let options, _, _): return options
          }
      }
      
      var animations: ((UIImageView, UIImage) -> Void)? {
          switch self {
          case .custom(_, _, let animations, _): return animations
          default: return { $0.image = $1 }
          }
      }
      
      var completion: ((Bool) -> Void)? {
          switch self {
          case .custom(_, _, _, let completion): return completion
          default: return nil
          }
      }
  }
  #endif