NetNewsWire/Evergreen/MainWindow/Sidebar/UnreadCountView.swift

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Swift
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//
// UnreadCountView.swift
// Evergreen
//
// Created by Brent Simmons on 11/22/15.
// Copyright © 2015 Ranchero Software, LLC. All rights reserved.
//
import Foundation
import AppKit
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private let padding = appDelegate.currentTheme.edgeInsets(forKey: "MainWindow.SourceList.unreadCount.padding")
private let cornerRadius = appDelegate.currentTheme.float(forKey: "MainWindow.SourceList.unreadCount.cornerRadius")
private let backgroundColor = appDelegate.currentTheme.colorWithAlpha(forKey: "MainWindow.SourceList.unreadCount.backgroundColor")
private let textColor = appDelegate.currentTheme.colorWithAlpha(forKey: "MainWindow.SourceList.unreadCount.color")
private let textSize = appDelegate.currentTheme.float(forKey: "MainWindow.SourceList.unreadCount.fontSize")
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private let textFont = NSFont.systemFont(ofSize: textSize, weight: NSFont.Weight.semibold)
private var textAttributes: [NSAttributedStringKey: AnyObject] = [NSAttributedStringKey.foregroundColor: textColor, NSAttributedStringKey.font: textFont, NSAttributedStringKey.kern: NSNull()]
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private var textSizeCache = [Int: NSSize]()
class UnreadCountView : NSView {
var unreadCount = 0 {
didSet {
invalidateIntrinsicContentSize()
needsDisplay = true
}
}
var unreadCountString: String {
return unreadCount < 1 ? "" : "\(unreadCount)"
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}
private var intrinsicContentSizeIsValid = false
private var _intrinsicContentSize = NSZeroSize
override var intrinsicContentSize: NSSize {
if !intrinsicContentSizeIsValid {
var size = NSZeroSize
if unreadCount > 0 {
size = textSize()
size.width += (padding.left + padding.right)
size.height += (padding.top + padding.bottom)
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}
_intrinsicContentSize = size
intrinsicContentSizeIsValid = true
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}
return _intrinsicContentSize
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}
override var isFlipped: Bool {
return true
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}
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override func invalidateIntrinsicContentSize() {
intrinsicContentSizeIsValid = false
}
private func textSize() -> NSSize {
if unreadCount < 1 {
return NSZeroSize
}
if let cachedSize = textSizeCache[unreadCount] {
return cachedSize
}
var size = unreadCountString.size(withAttributes: textAttributes)
size.height = ceil(size.height)
size.width = ceil(size.width)
textSizeCache[unreadCount] = size
return size
}
private func textRect() -> NSRect {
let size = textSize()
var r = NSZeroRect
r.size = size
r.origin.x = (NSMaxX(bounds) - padding.right) - r.size.width
r.origin.y = padding.top
return r
}
override func draw(_ dirtyRect: NSRect) {
let path = NSBezierPath(roundedRect: bounds, xRadius: cornerRadius, yRadius: cornerRadius)
backgroundColor.setFill()
path.fill()
if unreadCount > 0 {
unreadCountString.draw(at: textRect().origin, withAttributes: textAttributes)
}
}
}