116 lines
2.7 KiB
Swift
116 lines
2.7 KiB
Swift
//
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// MasterUnreadCountView.swift
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// NetNewsWire
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//
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// Created by Brent Simmons on 11/22/15.
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// Copyright © 2015 Ranchero Software, LLC. All rights reserved.
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//
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import UIKit
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class MasterFeedUnreadCountView : UIView {
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private let padding = UIEdgeInsets(top: 1.0, left: 7.0, bottom: 1.0, right: 7.0)
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private let cornerRadius = 8.0
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private let bgColor = UIColor.darkGray
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private let textColor = UIColor.white
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private var textAttributes: [NSAttributedString.Key: AnyObject] {
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let textFont = UIFont.preferredFont(forTextStyle: .caption1)
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return [NSAttributedString.Key.foregroundColor: textColor, NSAttributedString.Key.font: textFont, NSAttributedString.Key.kern: NSNull()]
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}
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private var textSizeCache = [Int: CGSize]()
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var unreadCount = 0 {
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didSet {
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invalidateIntrinsicContentSize()
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setNeedsDisplay()
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}
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}
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var unreadCountString: String {
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return unreadCount < 1 ? "" : "\(unreadCount)"
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}
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private var intrinsicContentSizeIsValid = false
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private var _intrinsicContentSize = CGSize.zero
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override init(frame: CGRect) {
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super.init(frame: frame)
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self.isOpaque = false
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}
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required init?(coder aDecoder: NSCoder) {
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super.init(coder: aDecoder)
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self.isOpaque = false
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}
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override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
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textSizeCache = [Int: CGSize]()
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invalidateIntrinsicContentSize()
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setNeedsDisplay()
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}
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override var intrinsicContentSize: CGSize {
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if !intrinsicContentSizeIsValid {
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var size = CGSize.zero
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if unreadCount > 0 {
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size = textSize()
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size.width += (padding.left + padding.right)
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size.height += (padding.top + padding.bottom)
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}
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_intrinsicContentSize = size
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intrinsicContentSizeIsValid = true
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}
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return _intrinsicContentSize
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}
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override func invalidateIntrinsicContentSize() {
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intrinsicContentSizeIsValid = false
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}
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private func textSize() -> CGSize {
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if unreadCount < 1 {
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return CGSize.zero
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}
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if let cachedSize = textSizeCache[unreadCount] {
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return cachedSize
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}
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var size = unreadCountString.size(withAttributes: textAttributes)
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size.height = ceil(size.height)
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size.width = ceil(size.width)
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textSizeCache[unreadCount] = size
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return size
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}
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private func textRect() -> CGRect {
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let size = textSize()
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var r = CGRect.zero
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r.size = size
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r.origin.x = (bounds.maxX - padding.right) - r.size.width
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r.origin.y = padding.top
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return r
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}
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override func draw(_ dirtyRect: CGRect) {
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let cornerRadii = CGSize(width: cornerRadius, height: cornerRadius)
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let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: .allCorners, cornerRadii: cornerRadii)
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bgColor.setFill()
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path.fill()
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if unreadCount > 0 {
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unreadCountString.draw(at: textRect().origin, withAttributes: textAttributes)
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}
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}
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}
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