Font size adjustment

App/Document Controls UI/FontSizeAdjustView.swift

@@ -0,0 +1,58 @@
+//
+//  FontSizeAdjustView.swift
+//  App
+//
+//  Created by James Magahern on 9/22/20.
+//
+
+import UIKit
+
+class FontSizeAdjustView: UIView
+{
+    let decreaseSizeButton = UIButton(frame: .zero)
+    let increaseSizeButton = UIButton(frame: .zero)
+    let labelView = UILabel(frame: .zero)
+    
+    convenience init() {
+        self.init(frame: .zero)
+        
+        labelView.textColor = .secondaryLabel
+        labelView.textAlignment = .center
+        labelView.text = "100%"
+        
+        tintColor = .black
+        
+        decreaseSizeButton.setImage(UIImage(systemName: "minus"), for: .normal)
+        increaseSizeButton.setImage(UIImage(systemName: "plus"), for: .normal)
+        
+        addSubview(increaseSizeButton)
+        addSubview(decreaseSizeButton)
+        addSubview(labelView)
+    }
+    
+    override func sizeThatFits(_ size: CGSize) -> CGSize {
+        CGSize(width: size.width, height: DocumentControlViewController.controlHeight)
+    }
+    
+    override func layoutSubviews() {
+        super.layoutSubviews()
+        
+        decreaseSizeButton.frame = CGRect(
+            x: 0.0, y: 0.0,
+            width: bounds.height,
+            height: bounds.height
+        )
+        
+        increaseSizeButton.frame = CGRect(
+            x: bounds.width - bounds.height, y: 0.0,
+            width: bounds.height,
+            height: bounds.height
+        )
+        
+        labelView.frame = CGRect(
+            x: decreaseSizeButton.frame.maxX, y: 0.0,
+            width: bounds.width - decreaseSizeButton.frame.width - increaseSizeButton.frame.width,
+            height: bounds.height
+        )
+    }
+}