Prevent save prompt when closing NSWindow

Question

I have a document-based Cocoa app that uses a secondary NSWindow for a preview mode (with shouldCloseDocument set to NO).

If the document is dirty (edited without saving) and I close the secondary NSWindow, a "Do you want to save the changes made to the document" prompt appears.

How can I avoid this prompt on the secondary NSWindow?

What if you set the document of the secondary window to nil in windowWillClose delegate method? — cocoafan, Aug 19 '12 at 00:00
Interesting idea but doesn't work. `windowWillClose` is called after the save prompt appears. — hpique, Aug 19 '12 at 13:57
And so is `windowShouldClose` of NSWindowDelegate and `close` of NSWindow. — hpique, Aug 19 '12 at 14:22

score 0 · Accepted Answer · answered Aug 19 '12 at 14:37

I couldn't find a way to do this. I expected to find a NSWindowDelegate or NSWindow method called before the save prompt but none of the obvious candidates (windowWillClose, close, performClose, windowShouldClose) are.

As a workaround, instead of setting NSWindowController.document I'm using a custom property to pass the document. With document set to NIL, the save prompt is not shown anymore.

score 0 · Answer 2 · answered Jan 02 '13 at 17:25

specifically you can do this inside your viewController subclass: make sure delegate is set from the window to the owner class:

//-------------------------------------------------------
- (void)windowControllerDidLoadNib:(NSWindowController *)aController
{
NSLog (@"windowControllerDidLoadNib");
    aController.document = nil;
    [super windowControllerDidLoadNib:aController];

............. etc.......

Prevent save prompt when closing NSWindow

2 Answers2