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ItemBox implementation
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‎Sources/CodeEditTextView/TextView/TextView+ItemBox.swift‎

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//
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// TextView+ItemBox.swift
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// CodeEditTextView
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//
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// Created by Abe Malla on 6/18/24.
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//
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import AppKit
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import SwiftUI
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public protocol ItemBoxEntry {
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var view: NSView { get }
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}
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public final class ItemBoxWindowController: NSWindowController {
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public static let DEFAULT_SIZE = NSSize(width: 300, height: 212)
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public var items: [any ItemBoxEntry] = [] {
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didSet {
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updateItems()
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}
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}
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private let tableView = NSTableView()
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private let scrollView = NSScrollView()
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private var localEventMonitor: Any?
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public var isVisible: Bool {
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return window?.isVisible ?? false
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}
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public init() {
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let window = NSWindow(
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contentRect: NSRect(origin: CGPoint.zero, size: ItemBoxWindowController.DEFAULT_SIZE),
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styleMask: [.resizable, .fullSizeContentView, .nonactivatingPanel],
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backing: .buffered,
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defer: false
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)
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// Style window
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window.titleVisibility = .hidden
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window.titlebarAppearsTransparent = true
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window.isExcludedFromWindowsMenu = true
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window.isReleasedWhenClosed = false
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window.level = .popUpMenu
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window.hasShadow = true
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window.isOpaque = false
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window.tabbingMode = .disallowed
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window.hidesOnDeactivate = true
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window.backgroundColor = .clear
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window.minSize = ItemBoxWindowController.DEFAULT_SIZE
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// Style the content with custom borders and colors
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window.contentView?.wantsLayer = true
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window.contentView?.layer?.backgroundColor = CGColor(
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srgbRed: 31.0 / 255.0, green: 31.0 / 255.0, blue: 36.0 / 255.0, alpha: 1.0
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)
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window.contentView?.layer?.cornerRadius = 8
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window.contentView?.layer?.borderWidth = 1
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window.contentView?.layer?.borderColor = NSColor.gray.withAlphaComponent(0.4).cgColor
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let innerShadow = NSShadow()
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innerShadow.shadowColor = NSColor.black.withAlphaComponent(0.1)
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innerShadow.shadowOffset = NSSize(width: 0, height: -1)
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innerShadow.shadowBlurRadius = 2
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window.contentView?.shadow = innerShadow
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super.init(window: window)
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setupTableView()
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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/// Opens the window of items
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public func show() {
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super.showWindow(nil)
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setupEventMonitor()
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}
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public func showWindow(attachedTo parentWindow: NSWindow) {
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guard let window = self.window else { return }
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parentWindow.addChildWindow(window, ordered: .above)
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window.orderFront(nil)
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// Close on window switch
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NotificationCenter.default.addObserver(
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forName: NSWindow.didResignKeyNotification,
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object: parentWindow,
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queue: .current
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) { [weak self] _ in
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self?.close()
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}
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self.show()
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}
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public override func close() {
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guard isVisible else { return }
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removeEventMonitor()
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super.close()
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}
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private func setupTableView() {
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tableView.delegate = self
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tableView.dataSource = self
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tableView.headerView = nil
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tableView.backgroundColor = .clear
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tableView.intercellSpacing = .zero
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tableView.selectionHighlightStyle = .none
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tableView.backgroundColor = .clear
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tableView.enclosingScrollView?.drawsBackground = false
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tableView.rowHeight = 24
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let column = NSTableColumn(identifier: NSUserInterfaceItemIdentifier("ItemsCell"))
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column.width = ItemBoxWindowController.DEFAULT_SIZE.width
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tableView.addTableColumn(column)
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scrollView.documentView = tableView
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scrollView.hasVerticalScroller = true
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scrollView.verticalScroller?.controlSize = .large
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scrollView.autohidesScrollers = true
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scrollView.automaticallyAdjustsContentInsets = false
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scrollView.contentInsets = NSEdgeInsetsZero
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window?.contentView?.addSubview(scrollView)
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scrollView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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scrollView.topAnchor.constraint(equalTo: window!.contentView!.topAnchor),
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scrollView.leadingAnchor.constraint(equalTo: window!.contentView!.leadingAnchor),
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scrollView.trailingAnchor.constraint(equalTo: window!.contentView!.trailingAnchor),
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scrollView.bottomAnchor.constraint(equalTo: window!.contentView!.bottomAnchor)
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])
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}
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private func updateItems() {
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tableView.reloadData()
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}
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public func tableViewSelectionDidChange(_ notification: Notification) {
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tableView.enumerateAvailableRowViews { (rowView, row) in
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if let cellView = rowView.view(atColumn: 0) as? CustomTableCellView {
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cellView.backgroundStyle = tableView.selectedRow == row ? .emphasized : .normal
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}
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}
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}
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private func setupEventMonitor() {
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localEventMonitor = NSEvent.addLocalMonitorForEvents(
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matching: [.keyDown, .leftMouseDown, .rightMouseDown]
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) { [weak self] event in
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guard let self = self else { return event }
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switch event.type {
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case .keyDown:
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switch event.keyCode {
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case 53: // Escape key
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self.close()
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case 125: // Down arrow
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self.selectNextItemInTable()
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return nil
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case 126: // Up arrow
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self.selectPreviousItemInTable()
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return nil
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case 36: // Return key
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return nil
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default:
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break
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}
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case .leftMouseDown, .rightMouseDown:
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// If we click outside the window, close the window
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if !NSMouseInRect(NSEvent.mouseLocation, self.window!.frame, false) {
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self.close()
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}
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default:
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break
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}
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return event
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}
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}
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private func removeEventMonitor() {
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if let monitor = localEventMonitor {
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NSEvent.removeMonitor(monitor)
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localEventMonitor = nil
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}
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}
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private func selectNextItemInTable() {
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let nextIndex = min(tableView.selectedRow + 1, items.count - 1)
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tableView.selectRowIndexes(IndexSet(integer: nextIndex), byExtendingSelection: false)
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tableView.scrollRowToVisible(nextIndex)
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}
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private func selectPreviousItemInTable() {
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let previousIndex = max(tableView.selectedRow - 1, 0)
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tableView.selectRowIndexes(IndexSet(integer: previousIndex), byExtendingSelection: false)
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tableView.scrollRowToVisible(previousIndex)
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}
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deinit {
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removeEventMonitor()
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}
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}
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extension ItemBoxWindowController: NSTableViewDataSource {
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public func numberOfRows(in tableView: NSTableView) -> Int {
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return items.count
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}
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}
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extension ItemBoxWindowController: NSTableViewDelegate {
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// public func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
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// items[row].view
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// }
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public func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
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let cellIdentifier = NSUserInterfaceItemIdentifier("CustomCell")
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var cell = tableView.makeView(withIdentifier: cellIdentifier, owner: nil) as? CustomTableCellView
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if cell == nil {
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cell = CustomTableCellView(frame: .zero)
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cell?.identifier = cellIdentifier
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}
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// Remove any existing subviews
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cell?.subviews.forEach { $0.removeFromSuperview() }
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let itemView = items[row].view
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cell?.addSubview(itemView)
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itemView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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itemView.topAnchor.constraint(equalTo: cell!.topAnchor),
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itemView.leadingAnchor.constraint(equalTo: cell!.leadingAnchor, constant: 4),
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itemView.trailingAnchor.constraint(equalTo: cell!.trailingAnchor, constant: -4),
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itemView.bottomAnchor.constraint(equalTo: cell!.bottomAnchor)
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])
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return cell
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}
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}
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private class CustomTableCellView: NSTableCellView {
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private let backgroundView = NSView()
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override init(frame frameRect: NSRect) {
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super.init(frame: frameRect)
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setup()
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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private func setup() {
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wantsLayer = true
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layerContentsRedrawPolicy = .onSetNeedsDisplay
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backgroundView.wantsLayer = true
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backgroundView.layer?.cornerRadius = 4
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addSubview(backgroundView, positioned: .below, relativeTo: nil)
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backgroundView.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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backgroundView.topAnchor.constraint(equalTo: topAnchor),
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backgroundView.leadingAnchor.constraint(equalTo: leadingAnchor),
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backgroundView.trailingAnchor.constraint(equalTo: trailingAnchor),
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backgroundView.bottomAnchor.constraint(equalTo: bottomAnchor)
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])
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}
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override var backgroundStyle: NSView.BackgroundStyle {
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didSet {
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updateBackgroundColor()
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}
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}
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private func updateBackgroundColor() {
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switch backgroundStyle {
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case .normal:
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backgroundView.layer?.backgroundColor = NSColor.clear.cgColor
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case .emphasized:
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backgroundView.layer?.backgroundColor = NSColor.systemBlue.withAlphaComponent(0.5).cgColor
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@unknown default:
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backgroundView.layer?.backgroundColor = NSColor.clear.cgColor
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}
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}
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}

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