aaf0a0c656
Run `make fmt`. Signed-off-by: Moritz Poldrack <git@moritz.sh> Acked-by: Robin Jarry <robin@jarry.cc>
67 lines
1.2 KiB
Go
67 lines
1.2 KiB
Go
package widgets
|
|
|
|
// Scrollable implements vertical scrolling
|
|
type Scrollable struct {
|
|
scroll int
|
|
height int
|
|
elems int
|
|
}
|
|
|
|
func (s *Scrollable) Scroll() int {
|
|
return s.scroll
|
|
}
|
|
|
|
func (s *Scrollable) PercentVisible() float64 {
|
|
if s.elems <= 0 {
|
|
return 1.0
|
|
}
|
|
return float64(s.height) / float64(s.elems)
|
|
}
|
|
|
|
func (s *Scrollable) PercentScrolled() float64 {
|
|
if s.elems <= 0 {
|
|
return 1.0
|
|
}
|
|
return float64(s.scroll) / float64(s.elems)
|
|
}
|
|
|
|
func (s *Scrollable) NeedScrollbar() bool {
|
|
needScrollbar := true
|
|
if s.PercentVisible() >= 1.0 {
|
|
needScrollbar = false
|
|
}
|
|
return needScrollbar
|
|
}
|
|
|
|
func (s *Scrollable) UpdateScroller(height, elems int) {
|
|
s.height = height
|
|
s.elems = elems
|
|
}
|
|
|
|
func (s *Scrollable) EnsureScroll(selectingIdx int) {
|
|
if selectingIdx < 0 {
|
|
return
|
|
}
|
|
|
|
maxScroll := s.elems - s.height
|
|
if maxScroll < 0 {
|
|
maxScroll = 0
|
|
}
|
|
|
|
if selectingIdx >= s.scroll && selectingIdx < s.scroll+s.height {
|
|
if s.scroll > maxScroll {
|
|
s.scroll = maxScroll
|
|
}
|
|
return
|
|
}
|
|
|
|
if selectingIdx >= s.scroll+s.height {
|
|
s.scroll = selectingIdx - s.height + 1
|
|
} else if selectingIdx < s.scroll {
|
|
s.scroll = selectingIdx
|
|
}
|
|
|
|
if s.scroll > maxScroll {
|
|
s.scroll = maxScroll
|
|
}
|
|
}
|