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Re: understanding NSTextView undo?

On Saturday, December 28, 2002, at 09:22 PM, Jim Correia wrote:

Yes, that would be nice.

I guess I would approach this by using your own controller object with -insertMacro: and -deleteMacro: methods, and have them register each other to undo each other's actions. You can set the selection range appropriately in each instead of depending upon NSTextView's undo management.

I could go down this road. The only down side is that I'd have to do all that shouldChangeTextInRange: replacementString: does except for creating the undo object (so if the delegate wanted to reject the change, it could, etc.)

It actually turns out that there is a simpler solution.

After changing the text, I do

[[[self undoManager] prepareWithInvocationTarget: self] undoRedoSelectionRange: selectedRange];

The "correct" range is selected on undo, so the method just has to do this:

- (void)undoRedoSelectionRange:(NSRange)range
{
[[[self undoManager] prepareWithInvocationTarget: self] undoRedoSelectionRange: range];

if ([[self undoManager] isRedoing])
{
[[self firstTextView] setSelectedRange: range];
}
}


Jim
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 >Re: understanding NSTextView undo? (From: Jim Correia <email@hidden>)



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