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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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import Cocoa
import TulsiGenerator
/// NSTableView that posts a notification when live resizing completes.
final class MessageTableView: NSTableView {
override func viewDidEndLiveResize() {
super.viewDidEndLiveResize()
// Give the delegate a chance to handle the resize now that the live operation is completed.
NotificationCenter.default.post(name: NSTableView.columnDidResizeNotification,
object: self)
}
}
/// View controller for the message output area in the Tulsi wizard.
final class MessageViewController: NSViewController, NSTableViewDelegate, NSUserInterfaceValidations {
let minRowHeight = CGFloat(16.0)
@IBOutlet var messageArrayController: NSArrayController!
@IBOutlet weak var messageAreaScrollView: NSScrollView!
// Display heights of each row in the message table.
var rowHeights = [Int: CGFloat]()
@objc dynamic var messageCount: Int = 0 {
didSet {
// Assume that a reduction in the message count means all cached heights are invalid.
if messageCount < oldValue {
rowHeights.removeAll(keepingCapacity: true)
}
scrollToNewRowIfAtBottom()
}
}
override func loadView() {
ValueTransformer.setValueTransformer(MessageTypeToImageValueTransformer(),
forName: NSValueTransformerName(rawValue: "MessageTypeToImageValueTransformer"))
super.loadView()
bind(NSBindingName(rawValue: "messageCount"), to: messageArrayController, withKeyPath: "arrangedObjects.@count", options: nil)
}
@IBAction func copy(_ sender: AnyObject?) {
guard let selectedItems = messageArrayController.selectedObjects as? [NSPasteboardWriting], !selectedItems.isEmpty else {
return
}
let pasteboard = NSPasteboard.general
pasteboard.clearContents()
pasteboard.writeObjects(selectedItems)
}
@IBAction func clearMessages(_ sender: AnyObject?) {
(self.representedObject as! TulsiProjectDocument).clearMessages()
}
// MARK: - NSUserInterfaceValidations
func validateUserInterfaceItem(_ item: NSValidatedUserInterfaceItem) -> Bool {
if item.action == #selector(copy(_:)) {
return !messageArrayController.selectedObjects.isEmpty
}
return false
}
// MARK: - NSTableViewDelegate
func tableView(_ tableView: NSTableView, heightOfRow row: Int) -> CGFloat {
if let height = rowHeights[row] {
return height
}
let message = (messageArrayController.arrangedObjects as! [UIMessage])[row]
let column = tableView.tableColumns.first!
let cell = column.dataCell as! NSTextFieldCell
cell.stringValue = message.text
let bounds = CGRect(x: 0, y: 0, width: column.width, height: CGFloat.greatestFiniteMagnitude)
let requiredSize = cell.cellSize(forBounds: bounds)
let height = max(requiredSize.height, minRowHeight)
rowHeights[row] = height
return height
}
func tableViewColumnDidResize(_ notification: Notification) {
guard let tableView = notification.object as? NSTableView else { return }
// Wait until resizing completes before doing a lot of work.
if tableView.inLiveResize {
return
}
// Disable animation.
NSAnimationContext.beginGrouping()
NSAnimationContext.current.duration = 0
rowHeights.removeAll(keepingCapacity: true)
let numRows = (messageArrayController.arrangedObjects as AnyObject).count!
let allRowsIndex = IndexSet(integersIn: 0..<numRows)
tableView.noteHeightOfRows(withIndexesChanged: allRowsIndex)
NSAnimationContext.endGrouping()
}
// MARK: - Private methods
private func scrollToNewRowIfAtBottom() {
guard messageCount > 0,
let tableView = messageAreaScrollView.documentView as? NSTableView else {
return
}
let lastRowIndex = messageCount - 1
let scrollContentViewBounds = messageAreaScrollView.contentView.bounds
let contentViewHeight = scrollContentViewBounds.height
let newRowHeight = self.tableView(tableView, heightOfRow: lastRowIndex) + tableView.intercellSpacing.height
let bottomScrollY = tableView.frame.maxY - (contentViewHeight + newRowHeight)
if scrollContentViewBounds.origin.y >= bottomScrollY {
tableView.scrollRowToVisible(lastRowIndex)
}
}
}
/// Transformer that converts a UIMessage type into an image to be displayed in the message view.
final class MessageTypeToImageValueTransformer : ValueTransformer {
override class func transformedValueClass() -> AnyClass {
return NSString.self
}
override class func allowsReverseTransformation() -> Bool {
return false
}
override func transformedValue(_ value: Any?) -> Any? {
guard let intValue = value as? Int,
let messageType = TulsiGenerator.LogMessagePriority(rawValue: intValue) else {
return nil
}
switch messageType {
case .info, .debug, .syslog:
return NSImage(named: NSImage.Name(rawValue: "message_info"))
case .warning:
return NSImage(named: NSImage.Name(rawValue: "message_warning"))
case .error:
return NSImage(named: NSImage.Name(rawValue: "message_error"))
}
}
}