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// Copyright 2016 The Tulsi Authors. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
import Cocoa
import TulsiGenerator
/// NSOpenPanel that allows the user to select a Bazel binary for a given project document.
class BazelSelectionPanel: FilteredOpenPanel {
// Checkbox in the Bazel path open panel's accessory view.
@IBOutlet weak var bazelSelectorUseAsDefaultCheckbox: NSButton!
static func beginSheetModalBazelSelectionPanelForWindow(_ window: NSWindow,
document: TulsiProjectDocument,
completionHandler: ((URL?) -> Void)? = nil) -> BazelSelectionPanel {
let panel = BazelSelectionPanel()
panel.delegate = panel
panel.message = NSLocalizedString("ProjectEditor_SelectBazelPathMessage",
comment: "Message to show at the top of the Bazel selector sheet, explaining what to do.")
panel.prompt = NSLocalizedString("ProjectEditor_SelectBazelPathPrompt",
comment: "Label for the button used to confirm the selected Bazel file in the Bazel selector sheet.")
var views: NSArray?
owner: panel,
topLevelObjects: &views)
// Note: topLevelObjects will contain the accessory view and an NSApplication object in a
// non-deterministic order.
if let views = views {
let viewsFound = views.filter() { $0 is NSView } as NSArray
if let accessoryView = viewsFound.firstObject as? NSView {
panel.accessoryView = accessoryView
if #available(OSX 10.11, *) {
panel.isAccessoryViewDisclosed = true
} else {
assertionFailure("Failed to load accessory view for Bazel open sheet.")
panel.canChooseDirectories = false
panel.canChooseFiles = true
panel.directoryURL = document.bazelURL?.deletingLastPathComponent()
panel.beginSheetModal(for: window) { value in
if value == NSApplication.ModalResponse.OK {
document.bazelURL = panel.url
if panel.bazelSelectorUseAsDefaultCheckbox.state == NSControl.StateValue.on {
UserDefaults.standard.set(document.bazelURL!, forKey: BazelLocator.DefaultBazelURLKey)
// Forcibly dismiss the panel before invoking the completion handler in case completion
// spawns new sheet modals.
if let completionHandler = completionHandler {
completionHandler(value == NSApplication.ModalResponse.OK ? panel.url : nil)
return panel