Marks
A mark is a particular position
between characters in a Text widget. Once you create a mark, you can
use it as an index. The gravity of the mark affects to which side
the text is inserted. Right
gravity is the default, in which case the text is inserted to the
right of the mark.
The two marks that are automatically set are insert and current. The insert mark refers to the position of the
insert cursor. The current mark
is the position closest to the mouse cursor.
The following methods are defined for marking:
markGravitySets the gravity of a mark. For example:
$text->markGravity('insert', 'left');markNamesReturns a list of all marks defined for the Text widget.
markSetCreates a mark at a specified index:
$text->markSet('saved', 'insert');markUnsetDeletes mark(s) from the Text widget:
$text->markUnset('saved');Note that you cannot delete the
insertorcurrentmarks.