constructor
( new scroll-event%
[ [event-typeevent-type]
[directiondirection]
[positionposition]
[time-stamptime-stamp]])
→(is-a?/c scroll-event% )

event-type :
(or/c 'top'bottom'line-up'line-down
'page-up'page-down'thumb)
= 'thumb
direction:(or/c 'horizontal'vertical)='vertical
position:dimension-integer? =0
time-stamp:exact-integer? =0

See the corresponding get- and set- methods for information about event-type, direction, position, and time-stamp.

method
(send a-scroll-event get-direction )
→(or/c 'horizontal'vertical)

Gets the identity of the scrollbar that was modified by the event, either the horizontal scrollbar or the vertical scrollbar, as 'horizontal or 'vertical, respectively. See also set-direction .

method
(send a-scroll-event get-event-type )

→
(or/c 'top'bottom'line-up'line-down
'page-up'page-down'thumb)

Returns the type of the event, one of the following:

'top — user clicked a scroll-to-top button
'bottom — user clicked a scroll-to-bottom button
'line-up — user clicked an arrow to scroll up or left one step
'line-down — user clicked an arrow to scroll down or right one step
'page-up — user clicked an arrow to scroll up or left one page
'page-down — user clicked an arrow to scroll down or right one page
'thumb — user dragged the scroll position indicator

method
(send a-scroll-event get-position )→dimension-integer?

Returns the position of the scrollbar after the action triggering the event. See also set-position .

method
(send a-scroll-event set-direction direction)→void?
direction:(or/c 'horizontal'vertical)

Sets the identity of the scrollbar that was modified by the event, either the horizontal scrollbar or the vertical scrollbar, as 'horizontal or 'vertical, respectively. See also get-direction .

method
(send a-scroll-event set-event-type type)→void?

type :
(or/c 'top'bottom'line-up'line-down
'page-up'page-down'thumb)

Sets the type of the event. See get-event-type for information about each event type.

method
(send a-scroll-event set-position position)→void?
position:dimension-integer?

Records the position of the scrollbar after the action triggering the event. (The scrollbar itself is unaffected). See also get-position .

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