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Fix list PageUp scrolling

This commit is contained in:
Caleb Bassi 2019-01-31 19:15:11 -08:00
parent 436eb3a261
commit 31540a46ad
1 changed files with 14 additions and 8 deletions
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22
widgets/list.go
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@ -96,20 +96,26 @@ func (self *List) ScrollDown() {
}
}
func (self *List) PageUp() { // Goes up one whole page.
if int(self.SelectedRow)-self.Inner.Dy() >= 0 {
self.topRow -= uint(self.Inner.Dy())
} else { // If at the first 'page', then go to the top and select the first item.
// PageUp scrolls up one whole page.
func (self *List) PageUp() {
// if on the first 'page'
if int(self.SelectedRow)-self.Inner.Dy() < 0 {
// go to the top
self.topRow = 0
} else {
self.topRow = uint(MaxInt(int(self.topRow)-self.Inner.Dy(), 0))
}
self.SelectedRow = self.topRow
}
func (self *List) PageDown() { // Down one whole page
if len(self.Rows)-int(self.topRow) > self.Inner.Dy() {
// PageDown scolls down one whole page.
func (self *List) PageDown() {
// if on last 'page'
if len(self.Rows)-int(self.topRow) <= self.Inner.Dy() {
// select last item
self.SelectedRow = uint(len(self.Rows) - 1)
} else {
self.topRow += uint(self.Inner.Dy())
self.SelectedRow = self.topRow
} else { // If at last 'page', then select last item.
self.SelectedRow = uint(len(self.Rows) - 1)
}
}