| 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.
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| → (is-a?/c scroll-event%) | ||||||||||||||||
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| 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? | ||||||||
|
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.