Cocoa Note

gistfile1.md

Cocoa Note (including AppKit)

• NSLayoutManager.setTemporaryAttributes(:forCharacterRange:) is far faster than NSTextStorage.setAttributes(:range:). On My iMac, former took about 2 seconds, and latter took about 17 seconds in optimised build of test suit.

• Anyway, modifying NSTextStorage also took 2 seconds when wrapped by beginEditing/endEditing pair. So this performance drop is mainly due to inefficient layout refresh. You will get same performance if you can suppress the layout refreshes.

NSWindow

• You should not kill the window object while func windowWillClose(notification: NSNotification) is being called. It will cause program crash. Just keep it alive. You can try to remove some subviews from it to clean up stuffs.

NSTableView

• If you want a cell (including view-based table-view, NSTableCellView in view-based table-view) to be edited with a small delay after selecting it (just like you're renaming a file in Finder), use this code.

    	outlineView.doubleAction			=	"dummyDoubleAction:"
  

This makes the table-view to wait for double-clicking timing, and the small delay will be introduced effectively.

• If you want to get notified when the node label editing starts, see here.

• NSTableView.sizeLastColumnToFit doesn seem to work if there's no row. Try applying this after you add some row.

NSTextField

• How to clear focus ring?

  let	tf	=	getTextField() as NSTextField
  tf.window!.makeFirstResponder(nil)
  

• How to clear focus ring with Escape key?

  @objc
  override func cancelOperation(sender: AnyObject?) {
  	self.window!.makeFirstResponder(nil)
  }
  

System Icons

OS X provides a lot of default icons. These icons are accessible via several methods.

• NSImage Constants

Here're related informations.

• http://stackoverflow.com/questions/1381915/how-do-i-get-the-icon-of-the-users-mac

• Apple provided "IconCollection" example. Newer, but contains only small number of icons.

• Another system icon viewer example. Old, but provides far more constants.

Typographics

• Layout Metrics

Drag & Drop

Note that drag-drop support could be overriden and can be different by view classes. For example, NSOutlineView uses completely different approach to support per-item drag-and-drop.

• Extremly simple example for bare bone NSViews

• NSOutlineView

  You should start with implementing this data-source method at first.

  @objc
  func outlineView(outlineView: NSOutlineView, pasteboardWriterForItem item: AnyObject?) -> NSPasteboardWriting! {
  	let	m	=	NSPasteboardItem()
  	return	m
  }
  

  You'll see the outlne-view will drag nodes immediately. Now start to add extra supports.