[Python-checkins] CVS: python/dist/src/Tools/idle PyShell.py,1.27,1.28

[Guido van Rossum]

Update of /projects/cvsroot/python/dist/src/Tools/idle
In directory eric:/projects/python/develop/guido/src/Tools/idle

Modified Files:
	PyShell.py 
Log Message:
Override the Undo delegator to forbid any changes before the I/O mark.
It beeps if you try to insert or delete before the "iomark" mark.
This makes the shell less confusing for newbies.


Index: PyShell.py
===================================================================
RCS file: /projects/cvsroot/python/dist/src/Tools/idle/PyShell.py,v
retrieving revision 1.27
retrieving revision 1.28
diff -C2 -r1.27 -r1.28
*** PyShell.py	2000/03/07 17:55:32	1.27
--- PyShell.py	2000/03/07 18:51:49	1.28
***************
*** 16,19 ****
--- 16,20 ----
  from FileList import FileList
  from ColorDelegator import ColorDelegator
+ from UndoDelegator import UndoDelegator
  from OutputWindow import OutputWindow
  from IdleConf import idleconf
***************
*** 128,131 ****
--- 129,154 ----
  
  
+ class ModifiedUndoDelegator(UndoDelegator):
+ 
+     # Forbid insert/delete before the I/O mark
+ 
+     def insert(self, index, chars, tags=None):
+         try:
+             if self.delegate.compare(index, "<", "iomark"):
+                 self.delegate.bell()
+                 return
+         except TclError:
+             pass
+         UndoDelegator.insert(self, index, chars, tags)
+ 
+     def delete(self, index1, index2=None):
+         try:
+             if self.delegate.compare(index1, "<", "iomark"):
+                 self.delegate.bell()
+                 return
+         except TclError:
+             pass
+         UndoDelegator.delete(self, index1, index2)
+ 
  class ModifiedInterpreter(InteractiveInterpreter):
  
***************
*** 265,268 ****
--- 288,292 ----
      # Override classes
      ColorDelegator = ModifiedColorDelegator
+     UndoDelegator = ModifiedUndoDelegator
  
      # Override menu bar specs