added iOS source code

[wl-app.git] / iOS / WolneLektury / Controls / ProgressLabel.swift

diff --git a/iOS/WolneLektury/Controls/ProgressLabel.swift b/iOS/WolneLektury/Controls/ProgressLabel.swift
new file mode 100644 (file)
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+++ b/iOS/WolneLektury/Controls/ProgressLabel.swift
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+//
+//  ProgressLabel.swift
+//  WolneLektury
+//
+//  Created by Pawel Dabrowski on 20/09/2018.
+//  Copyright © 2018 Fundacja Nowoczesna Polska. All rights reserved.
+//
+
+import UIKit
+
+// from https://stackoverflow.com/a/46047570/871425
+class ProgressLabel: UIView {
+    
+    private var privateColor = UIColor.green
+    @IBInspectable var color: UIColor {
+        get {
+            return privateColor
+        }set {
+            privateColor = newValue
+        }
+    }
+
+    var textColor = UIColor.white
+    var font = UIFont.systemFont(ofSize: 15)
+    var fullProgress: Bool = false
+    var customText: String? {
+        didSet{
+            if customText != nil{
+                setNeedsDisplay()
+            }
+        }
+    }
+    var progress: Float = 0 {
+        didSet {
+            customText = nil
+            progress = Float.minimum(100.0, Float.maximum(progress, 0.0))
+            self.setNeedsDisplay()
+        }
+    }
+    
+    override func draw(_ rect: CGRect) {
+        let context = UIGraphicsGetCurrentContext()!
+        
+        // Set up environment.
+        let size = self.bounds.size
+
+        layer.borderColor = privateColor.cgColor
+        layer.borderWidth = 1.0
+        layer.cornerRadius = 10
+        clipsToBounds = true
+        
+        var prg = progress
+        var progressMessage = NSString(format:"Pobieranie %d%%", Int(prg))
+
+        if let customText = customText{
+            prg = fullProgress ? 100 : 0
+            progressMessage = customText as NSString
+        }
+        
+        // Prepare progress as a string.
+        var attributes: [NSAttributedStringKey:Any] = [ NSAttributedStringKey.font : font ]
+        let textSize = progressMessage.size(withAttributes: attributes)
+        let progressX = ceil(CGFloat(prg) / 100 * size.width)
+        let textPoint = CGPoint(x: ceil((size.width - textSize.width) / 2.0), y: ceil((size.height - textSize.height) / 2.0))
+        
+        // Draw background + foreground text
+        privateColor.setFill()
+        context.fill(self.bounds)
+        attributes[NSAttributedStringKey.foregroundColor] = textColor
+        let rct = CGRect(x: 20, y: 12, width: bounds.size.width - 20, height: bounds.size.height - 13)
+        progressMessage.draw(in: rct, withAttributes: attributes)
+
+        // Clip the drawing that follows to the remaining progress' frame.
+        context.saveGState()
+        let remainingProgressRect = CGRect(x: progressX, y: 0.0, width: size.width - progressX, height: size.height)
+        context.addRect(remainingProgressRect)
+        context.clip()
+        
+        // Draw again with inverted colors.
+        textColor.setFill()
+        context.fill(self.bounds)
+        attributes[NSAttributedStringKey.foregroundColor] = privateColor
+        progressMessage.draw(in: rct, withAttributes: attributes)
+
+        context.restoreGState()
+    }
+}