> Text _fields_ and text _views_ are different when it comes to undo/redo. The
> main difference is that you can simply turn on undo/redo in a text view in
> Interface Builder and it works, while you have to do something more in
> addition to that to make "live" undo/redo work correctly in a text field. My
> Recipe 7 was designed only to deal with the text _field_ problem.
>
> My Recipes 16 and 17 describe how to implement a text _view_ in a drawer,
> with undo/redo.
>
> However, keeping the text view's undo/redo separate from NSDocument's
> undo/redo may be a bit trickier. If I recall correctly, you will have to
> create a separate undo manager instance, similar to part of what Recipe 7
> describes.
Hi Bill,
Thanks for the info.
I have code that creates a new NSUndoManager for my text view, and I have a
undoManagerForTextView: delegate method which is being called. However, the
Undo/Redo menu commands are never activated when the sheet is running.
I originally was using the document's undo manager, and using some of your
code examples to remove the undo/redo actions generated in the panel.
Here's the code (variables starting with m are instance variables):
@implementation DescriptionSheetController
- (void) awakeFromNib
{
[mSheet setDelegate:self];
[mText setDelegate:self];
[mText setRulerVisible:YES];
[mText setAllowsUndo:YES];
[mText setRichText:YES];
}
- (void) dealloc
{
[mSheet release];
[mUndoManager release];
[super dealloc];
}
- (void) sheetDidEnd:(id) sheet returnCode:(int) returnCode
contextInfo:(void*) contextInfo
{
[sheet orderOut:self];
switch (returnCode)
{
case NSAlertDefaultReturn:
{
NSAttributedString* desc = [[[NSAttributedString alloc]
initWithAttributedString:[mText textStorage]] autorelease];
[mOwner setAttributedDescription:desc];
}
break;
}
}
- (void) showSheet:(NSWindow*) owningWindow
{
[[mText textStorage] setAttributedString:[mOwner
attributedDescription]];
[[NSApplication sharedApplication] beginSheet:mSheet
modalForWindow:owningWindow
modalDelegate:self
didEndSelector:@selector(sheetDidEnd:returnCode:contextInfo:)
contextInfo:NULL];
[mSheet makeFirstResponder:mText];
}
- (IBAction) doCancel:(id) sender
{
[[NSApplication sharedApplication] endSheet:mSheet
returnCode:NSAlertAlternateReturn];
}
- (IBAction) doOK:(id) sender
{
[[NSApplication sharedApplication] endSheet:mSheet
returnCode:NSAlertDefaultReturn];
}
// NSTextView delegate methods
- (NSUndoManager*) undoManagerForTextView: (NSTextView*) aTextView
{
if (!mUndoManager)
mUndoManager = [[NSUndoManager alloc] init];
return mUndoManager;
}
@end
Cheers
-Mark
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