Practical Programming in Tcl & Tk, Third Edition By Brent B. Welch
Table of Contents
Chapter 48. Tcl 7.4/Tk 4.0
Canvas scrollincrement
The canvas widget changed the scrollIncrement attribute to a pair of attributes: xScrollIncrement and yScrollIncrement. The default for these is now one-tenth the width (height) of the canvas instead of one pixel. Scrolling by one page scrolls by nine-tenths of the canvas display.
