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//
// 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 laid 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)
}
}
}
}
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