| scroll-event% : class? |
superclass: event% |
A scroll-event% object contains information about a scroll
event. An instance of scroll-event% is always provided to
on-scroll.
See get-event-type for a list of the scroll event types.
(new scroll-event% [ [event-type event-type] [direction direction] [position position] [time-stamp time-stamp]]) → (is-a?/c scroll-event%)
event-type :
(one-of/c 'top 'bottom 'line-up 'line-down 'page-up 'page-down 'thumb) = 'thumb direction : (one-of/c 'horizontal 'vertical) = 'vertical position : (integer-in 0 10000) = 0 time-stamp : exact-integer? = 0
See the corresponding get- and set- methods for
information about event-type, direction, position,
and time-stamp.
(send a-scroll-event get-direction) → (one-of/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.
(send a-scroll-event get-event-type) → (one-of/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
(send a-scroll-event get-position) → (integer-in 0 10000)
Returns the position of the scrollbar after the action triggering the
event. See also set-position.
(send a-scroll-event set-direction direction) → void? direction : (one-of/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.
(send a-scroll-event set-event-type type) → void?
type :
(one-of/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.
(send a-scroll-event set-position position) → void? position : (integer-in 0 10000)
Records the position of the scrollbar after the action triggering the
event. (The scrollbar itself is unaffected). See also
get-position.