The TextUndo Widget
The TextUndo widget is derived from the Text widget, which simply means that it shares all the capabilities of its ancestor. In object-oriented terminology, we say that TextUndo is a subclass of Text (or, Text is a superclass of TextUndo). You’ll learn more about this subject in Chapter 14.
Of course, we expect TextUndo to do something
different from Text, and it does: it has unlimited undos and redos so
that previous editing operations can be rescinded or redone.
Here are the TextUndo methods above and beyond those available for a Text widget:
- $
textundo->ConfirmDiscard
Displays a messageBox that says “Save edits?”. Returns 0 if
yes
orcancel
, 1 ifno
.-
$textundo->ConfirmEmptyDocument
Displays a messageBox that says “Save edits?.” The widget is cleared if the reply is
no
.-
$textundo->ConfirmExit
Destroys the widget if you answer
yes
.-
$textundo->CreateFileSelect
Creates a popup file browser to select a filename.
-
$textundo->deleteStringAtStartOfSelectedLines(
string
)
Deletes
string
from the start of every selected line.-
$textundo>->EmptyDocument
Deletes all text and undo/redo information;
undef
s the filename.-
$textundo->FileName(?
pathName
?)
Optionally updates the current filename to
pathName
. Returns the current filename.-
$textundo->IncludeFile
Similar to
Load
, except it does not callEmptyDocument
first.-
$textundo->insertStringAtStartOfSelectedLines(
string
)
Inserts
string
at the start of every selected line.-
$textundo->Load(
pathName
)
Loads the contents ...
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