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Although a binding to could be made via tkinter, what we really want to do is to hook the Tk 'insert' operation itself. For one thing, we want a text.insert call in idle code to have the same effect as a key press. When a widget is instantiated, a Tcl command is created whose name is the same as the pathname widget._w. This command is used to invoke the various widget operations, e.g. insert (for a Text widget). We are going to hook this command and provide a facility ('register') to intercept the widget operation. We will also intercept method calls on the tkinter class instance that represents the tk widget. In IDLE, WidgetRedirector is used in Percolator to intercept Text commands. The function being registered provides access to the top of a Percolator chain. At the bottom of the chain is a call to the original Tk widget operation. cCsJi|_||_|j|_}|j}|d|_|d||j|||jdS)aInitialize attributes and setup redirection. _operations: dict mapping operation name to new function. widget: the widget whose tcl command is to be intercepted. tk: widget.tk, a convenience attribute, probably not needed. orig: new name of the original tcl command. Since renaming to orig fails with TclError when orig already exists, only one WidgetDirector can exist for a given widget. Z_origrenameN) _operationswidgettk_worigcallZ createcommanddispatch)selfrrwr1/opt/python39/lib/python3.9/idlelib/redirector.py__init__s   zWidgetRedirector.__init__cCsd|jj|jjj|jjfS)Nz %s(%s<%s>)) __class____name__rrr rrr__repr__1szWidgetRedirector.__repr__cCsRt|jD]}||q |j}|j}|j}|||d|j||`|`dS)zBUnregister operations and revert redirection created by .__init__.rN) listr unregisterrrrZ deletecommandr r )r operationrrr rrrclose6s  zWidgetRedirector.closecCs"||j|<t|j||t||S)aReturn OriginalCommand(operation) after registering function. Registration adds an operation: function pair to ._operations. It also adds a widget function attribute that masks the tkinter class instance method. Method masking operates independently from command dispatch. If a second function is registered for the same operation, the first function is replaced in both places. )rsetattrrOriginalCommandr rfunctionrrrregisterCs zWidgetRedirector.registercCsL||jvrD|j|}|j|=zt|j|Wnty>Yn0|SdSdS)z~Return the function for the operation, or None. Deleting the instance attribute unmasks the class attribute. N)rdelattrrAttributeErrorrrrrrRs   zWidgetRedirector.unregistercGsP|j|}z*|r||WS|j|j|f|WSWntyJYdS0dS)aCallback from Tcl which runs when the widget is referenced. If an operation has been registered in self._operations, apply the associated function to the args passed into Tcl. Otherwise, pass the operation through to Tk via the original Tcl function. Note that if a registered function is called, the operation is not passed through to Tk. Apply the function returned by self.register() to *args to accomplish that. For an example, see colorizer.py. N)rgetrr r r)r rargsmrrrr bs   zWidgetRedirector.dispatchN) r __module__ __qualname____doc__rrrrrr rrrrrs rc@s(eZdZdZddZddZddZdS) ra7Callable for original tk command that has been redirected. Returned by .register; can be used in the function registered. redir = WidgetRedirector(text) def my_insert(*args): print("insert", args) original_insert(*args) original_insert = redir.register("insert", my_insert) cCs6||_||_|j|_|j|_|jj|_|j|f|_dS)zCreate .tk_call and .orig_and_operation for .__call__ method. .redir and .operation store the input args for __repr__. .tk and .orig copy attributes of .redir (probably not needed). N)redirrrr r tk_callorig_and_operation)r r'rrrrrs  zOriginalCommand.__init__cCsd|jj|j|jfS)Nz %s(%r, %r))rrr'rrrrrrszOriginalCommand.__repr__cGs||j|S)N)r(r))r r"rrr__call__szOriginalCommand.__call__N)rr$r%r&rrr*rrrrrxs rc sddlm}m}||}|dtt|ddd\}}|d||df||}|| t |}fdd }| d |dS) Nr)ToplevelTextzTest WidgetRedirector+z+%d+%dcstd||dS)Ninsert)print)r"Zoriginal_insertrr my_inserts z%_widget_redirector..my_insertr0) tkinterr+r,titlemapintZgeometrysplitpackZ focus_setrr) parentr+r,topxytextr'r3rr2r_widget_redirectors   r?__main__)mainz!idlelib.idle_test.test_redirectorF) verbosityexit)runN) r4rrrr?rZunittestrAZidlelib.idle_test.htestrErrrrs u!