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NSComboBox - fixed disappearing list
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| // | |
| // FixedComboBox.swift | |
| // Snippety | |
| // | |
| // Created by Wojciech Kulik on 03/09/2020. | |
| // Copyright © 2020 Wojciech Kulik. All rights reserved. | |
| // | |
| import Cocoa | |
| final class ClickView: NSView { | |
| var onMouseDown: () -> (Bool) = { return false } | |
| override func mouseDown(with event: NSEvent) { | |
| if !onMouseDown() { | |
| super.mouseDown(with: event) | |
| } | |
| } | |
| } | |
| /// https://stackoverflow.com/questions/63726518/nscombobox-closes-immediately-after-click | |
| final class FixedComboBox: NSComboBox { | |
| private let clickView = ClickView() | |
| override init(frame frameRect: NSRect) { | |
| super.init(frame: frameRect) | |
| fix() | |
| } | |
| required init?(coder: NSCoder) { | |
| super.init(coder: coder) | |
| } | |
| override func awakeFromNib() { | |
| super.awakeFromNib() | |
| fix() | |
| } | |
| private func fix() { | |
| clickView.onMouseDown = { [weak self] in | |
| guard let cell = self?.cell else { return false } | |
| // first expand will be immediately closed because of Cocoa bug | |
| cell.setAccessibilityExpanded(true) | |
| // we need to expand it again to fix the issue | |
| // this one we schedule almost immediately to avoid blinking | |
| DispatchQueue.main.async { cell.setAccessibilityExpanded(true) } | |
| // in case the first one didn't "catch" the right moment (sometimes it happens) | |
| DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(100)) { cell.setAccessibilityExpanded(true) } | |
| return true | |
| } | |
| addSubview(clickView) | |
| clickView.snp.makeConstraints { make in | |
| make.width.equalTo(20) | |
| make.trailing.top.bottom.equalToSuperview() | |
| } | |
| } | |
| } |
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