Indicator.swift
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//
// Indicator.swift
// Kingfisher
//
// Created by João D. Moreira on 30/08/16.
//
// Copyright (c) 2018 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)
import AppKit
#else
import UIKit
#endif
#if os(macOS)
public typealias IndicatorView = NSView
#else
public typealias IndicatorView = UIView
#endif
public enum IndicatorType {
/// No indicator.
case none
/// Use system activity indicator.
case activity
/// Use an image as indicator. GIF is supported.
case image(imageData: Data)
/// Use a custom indicator, which conforms to the `Indicator` protocol.
case custom(indicator: Indicator)
}
// MARK: - Indicator Protocol
public protocol Indicator {
func startAnimatingView()
func stopAnimatingView()
var viewCenter: CGPoint { get set }
var view: IndicatorView { get }
}
extension Indicator {
#if os(macOS)
public var viewCenter: CGPoint {
get {
let frame = view.frame
return CGPoint(x: frame.origin.x + frame.size.width / 2.0, y: frame.origin.y + frame.size.height / 2.0 )
}
set {
let frame = view.frame
let newFrame = CGRect(x: newValue.x - frame.size.width / 2.0,
y: newValue.y - frame.size.height / 2.0,
width: frame.size.width,
height: frame.size.height)
view.frame = newFrame
}
}
#else
public var viewCenter: CGPoint {
get {
return view.center
}
set {
view.center = newValue
}
}
#endif
}
// MARK: - ActivityIndicator
// Displays a NSProgressIndicator / UIActivityIndicatorView
final class ActivityIndicator: Indicator {
#if os(macOS)
private let activityIndicatorView: NSProgressIndicator
#else
private let activityIndicatorView: UIActivityIndicatorView
#endif
private var animatingCount = 0
var view: IndicatorView {
return activityIndicatorView
}
func startAnimatingView() {
animatingCount += 1
// Already animating
if animatingCount == 1 {
#if os(macOS)
activityIndicatorView.startAnimation(nil)
#else
activityIndicatorView.startAnimating()
#endif
activityIndicatorView.isHidden = false
}
}
func stopAnimatingView() {
animatingCount = max(animatingCount - 1, 0)
if animatingCount == 0 {
#if os(macOS)
activityIndicatorView.stopAnimation(nil)
#else
activityIndicatorView.stopAnimating()
#endif
activityIndicatorView.isHidden = true
}
}
init() {
#if os(macOS)
activityIndicatorView = NSProgressIndicator(frame: CGRect(x: 0, y: 0, width: 16, height: 16))
activityIndicatorView.controlSize = .small
activityIndicatorView.style = .spinning
#else
#if os(tvOS)
let indicatorStyle = UIActivityIndicatorView.Style.white
#else
let indicatorStyle = UIActivityIndicatorView.Style.gray
#endif
#if swift(>=4.2)
activityIndicatorView = UIActivityIndicatorView(style: indicatorStyle)
#else
activityIndicatorView = UIActivityIndicatorView(activityIndicatorStyle: indicatorStyle)
#endif
activityIndicatorView.autoresizingMask = [.flexibleLeftMargin, .flexibleRightMargin, .flexibleBottomMargin, .flexibleTopMargin]
#endif
}
}
// MARK: - ImageIndicator
// Displays an ImageView. Supports gif
final class ImageIndicator: Indicator {
private let animatedImageIndicatorView: ImageView
var view: IndicatorView {
return animatedImageIndicatorView
}
init?(imageData data: Data, processor: ImageProcessor = DefaultImageProcessor.default, options: KingfisherOptionsInfo = KingfisherEmptyOptionsInfo) {
var options = options
// Use normal image view to show animations, so we need to preload all animation data.
if !options.preloadAllAnimationData {
options.append(.preloadAllAnimationData)
}
guard let image = processor.process(item: .data(data), options: options) else {
return nil
}
animatedImageIndicatorView = ImageView()
animatedImageIndicatorView.image = image
animatedImageIndicatorView.frame = CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height)
#if os(macOS)
// Need for gif to animate on macOS
self.animatedImageIndicatorView.imageScaling = .scaleNone
self.animatedImageIndicatorView.canDrawSubviewsIntoLayer = true
#else
animatedImageIndicatorView.contentMode = .center
animatedImageIndicatorView.autoresizingMask = [.flexibleLeftMargin,
.flexibleRightMargin,
.flexibleBottomMargin,
.flexibleTopMargin]
#endif
}
func startAnimatingView() {
#if os(macOS)
animatedImageIndicatorView.animates = true
#else
animatedImageIndicatorView.startAnimating()
#endif
animatedImageIndicatorView.isHidden = false
}
func stopAnimatingView() {
#if os(macOS)
animatedImageIndicatorView.animates = false
#else
animatedImageIndicatorView.stopAnimating()
#endif
animatedImageIndicatorView.isHidden = true
}
}