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Specifies the body of a command to invoke to change the view in the widget associated with the scrollbar. When a user requests a view change by manipulating the scrollbar, a command is invoked. The actual command consists of this option followed by additional information as described later. This option should have a value of this kind: (lambda (cmd num) (#<widget> 'xview cmd num)) or (lambda (cmd num) (#<widget> 'yview cmd num)) depending on scrolling is horizontal or vertical. All scrollable widgets have xview and yview commands that take exactly the additional arguments appended. |