1 files changed, 145 insertions, 0 deletions
diff --git a/ios/LibreOfficeLight/LibreOfficeLight/ButtonScrollView.swift b/ios/LibreOfficeLight/LibreOfficeLight/ButtonScrollView.swift
new file mode 100644
index 000000000000..279ad22123b6
--- /dev/null
+++ b/ios/LibreOfficeLight/LibreOfficeLight/ButtonScrollView.swift
@@ -0,0 +1,145 @@
+//
+// This file is part of the LibreOffice project.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+//
+import UIKit
+
+/// Scrollable list of buttons.
+/// Kind of like a tab bar, but doesn't maintain or switch between views, just calls back on click
+open class ButtonScrollView: UIScrollView
+{
+    var buttonList: ButtonList? = nil
+
+    var buttonClickedCallback: ( (Int) -> () )? = nil
+
+    var selectedIndex: Int?
+    {
+        get {
+            return buttonList?.selectedIndex
+        }
+        set {
+            buttonList?.selectedIndex = selectedIndex
+        }
+    }
+
+    public override init(frame: CGRect)
+    {
+        super.init(frame: frame)
+    }
+
+    public required init?(coder aDecoder: NSCoder)
+    {
+        super.init(coder: aDecoder)
+    }
+
+    public func setButtonLabels(labels: [String])
+    {
+        if let bl = buttonList
+        {
+            bl.removeFromSuperview()
+        }
+        let bl = ButtonList(frame: CGRect(x:0, y:0, width: self.frame.width, height:44),
+                                labels: labels,
+                                owner: self)
+        self.addSubview(bl)
+        self.contentSize = bl.frame.size
+        self.buttonList = bl
+    }
+}
+
+/// Horizontally layed out buttons, living within the owned scroll view
+open class ButtonList: UIView
+{
+    let labels: [String]
+    let gap: CGFloat = 10.0
+    let topGap: CGFloat = 8
+    weak var owner: ButtonScrollView? = nil
+
+    var buttonBackground = UIColor(white: 0.6, alpha: 1)
+    var selectedButtonBackground = UIColor.white
+
+    var selectedIndex: Int? = 0
+    {
+        didSet {
+            runOnMain {
+                self.highlightSelectedIndex()
+            }
+        }
+    }
+
+    public init(frame: CGRect, labels: [String], owner: ButtonScrollView)
+    {
+        self.labels = labels
+        self.owner = owner
+        super.init(frame: frame)
+        self.backgroundColor = UIColor(white: 0.9, alpha: 1)
+
+        var idx = 0
+        for label in labels
+        {
+            let b = UIButton(type: .custom)
+            b.setTitle(label, for: .normal)
+            b.backgroundColor = buttonBackground
+            b.contentEdgeInsets = UIEdgeInsets(top: 4, left: 4, bottom: 4, right: 4)
+            b.layer.cornerRadius = 4
+            b.tag = idx
+            b.addTarget(self, action: #selector(buttonTapped), for: UIControlEvents.touchUpInside)
+            self.addSubview(b)
+            idx += 1
+        }
+        self.layoutSubviews()
+    }
+
+    @objc func buttonTapped(sender: UIButton, forEvent event: UIEvent)
+    {
+        let idx = sender.tag
+        owner?.buttonClickedCallback?(idx)
+        self.selectedIndex = idx
+    }
+
+    public required init?(coder aDecoder: NSCoder)
+    {
+        fatalError("init(coder:) has not been implemented")
+    }
+
+    public var buttons: [UIButton]
+    {
+        return self.subviews.flatMap({ $0 as? UIButton })
+    }
+
+    open override func layoutSubviews()
+    {
+
+        var x: CGFloat = gap
+        for button in buttons
+        {
+            button.sizeToFit()
+            let s = button.frame.size
+            button.frame = CGRect(x: x, y: topGap, width: s.width, height: s.height)
+            x = x + (s.width + gap)
+        }
+        highlightSelectedIndex()
+        self.frame = CGRect(x:0, y: 0, width: x, height: self.frame.height)
+    }
+
+    open func highlightSelectedIndex()
+    {
+        for (index, button) in buttons.enumerated()
+        {
+            if (index == selectedIndex)
+            {
+                button.backgroundColor = selectedButtonBackground
+                button.setTitleColor(.black, for: .normal)
+            }
+            else
+            {
+                button.backgroundColor = buttonBackground
+                button.setTitleColor(.white, for: .normal)
+            }
+
+        }
+    }
+}