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Merge pull request #218 from NovA9232/master

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Added PageUp and PageDown functions to List.
This commit is contained in:
Caleb Bassi 2019-01-31 18:56:08 -08:00
commit c0336475e6
1 changed files with 19 additions and 1 deletions
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20
widgets/list.go
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@ -34,7 +34,7 @@ func (self *List) Draw(buf *Buffer) {
point := self.Inner.Min point := self.Inner.Min
if self.SelectedRow >= uint(self.Inner.Max.Y)+self.topRow-2 { if self.SelectedRow >= uint(self.Inner.Max.Y)+self.topRow-2 {
self.topRow = self.SelectedRow-uint(self.Inner.Max.Y)+2 self.topRow = self.SelectedRow - uint(self.Inner.Max.Y) + 2
} else if self.SelectedRow < self.topRow { } else if self.SelectedRow < self.topRow {
self.topRow = self.SelectedRow self.topRow = self.SelectedRow
} }
@ -95,3 +95,21 @@ 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.
self.topRow = 0
}
self.SelectedRow = self.topRow
}
func (self *List) PageDown() { // Down one whole page
if len(self.Rows)-int(self.topRow) > self.Inner.Dy() {
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)
}
}