Tk Source Code

I would like to have a way to query the current depth of 
the undo and redo stacks of a text widget.

This would allow to enable/disable contextually Undo 
and Redo commands in applications.

Whether the undo stack is empty or not can be known 
by querying the modified flag (although this is not 
equivalent, but I can set the modified flag manually in 
such a way that it is).

I have however no solution for the redo stack depth. How 
can I know if it's zero or not? Currently I have to track 
manually any editing in my text widget, this is 
cumbersome and greatly lowers the interest of using the 
embedded .text edit commands.

In summary please add a command that gives the 
current depth of each stack, or at least a command that 
says if the depths are zero or not.

Thanks,
Francois

TIP #446 now merged to core-8-6-branch and trunk following positive vote by the TCT.

Discussion about [http://tip.tcl.tk/446.html|TIP #446] can be followed on [http://code.activestate.com/lists/tcl-core/15649/|TCLCORE].

<a href="http://tip.tcl.tk/446.html">TIP #446</a> created to discuss this.