SpecTcl Tutorial - part 2
As the soon-to-be-created widget is dragged over the canvas, three kinds
of feedback is provided to the user:
-
The row and column indicators light up for the cell that the widget is
about to be dropped into,
-
The cursor shape changes to indicate what will happen if the mouse button
is released at the current position.
-
The Message area prints the current row and column number, and indicates
if the current cell is occupied or not.
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