func (l *List) VisibleItemRange(includePartiallyVisible bool) (startIndex, endIndex int) {
if l.itemCount == 0 {
return 0, 0
}
s := l.outer.Size()
p := l.outer.Padding()
majorAxisItemSize := l.MajorAxisItemSize()
if majorAxisItemSize == 0 {
return 0, 0
}
startIndex = l.scrollOffset
if !includePartiallyVisible {
startIndex += majorAxisItemSize - 1
}
if l.orientation.Horizontal() {
endIndex = l.scrollOffset + s.W - p.W()
} else {
endIndex = l.scrollOffset + s.H - p.H()
}
if includePartiallyVisible {
endIndex += majorAxisItemSize - 1
}
startIndex = math.Max(startIndex/majorAxisItemSize, 0)
endIndex = math.Min(endIndex/majorAxisItemSize, l.itemCount)
return startIndex, endIndex
}
func (t *TextBoxController) IndexDown(i int) int {
l := t.LineIndex(i)
x := i - t.LineStart(l)
if l < t.LineCount()-1 {
return math.Min(t.LineStart(l+1)+x, t.LineEnd(l+1))
} else {
return t.LineEnd(l)
}
}
func (t *TextBoxController) IndexUp(i int) int {
l := t.LineIndex(i)
x := i - t.LineStart(l)
if l > 0 {
return math.Min(t.LineStart(l-1)+x, t.LineEnd(l-1))
} else {
return 0
}
}
// InputEventHandler overrides
func (s *ScrollBar) Click(ev gxui.MouseEvent) (consume bool) {
if !s.barRect.Contains(ev.Point) {
p := s.positionAt(ev.Point)
from, to := s.scrollPositionFrom, s.scrollPositionTo
switch {
case p < from:
width := to - from
from = math.Max(from-width, 0)
s.SetScrollPosition(from, from+width)
case p > to:
width := to - from
to = math.Min(to+width, s.scrollLimit)
s.SetScrollPosition(to-width, to)
}
}
return true
}
func (t *TextBoxController) UnindentSelection(tabWidth int) {
text, edit, edits := t.text, TextBoxEdit{}, []TextBoxEdit{}
lastLine := -1
for i := len(t.selections) - 1; i >= 0; i-- {
s := t.selections[i]
lis, lie := t.LineIndex(s.start), t.LineIndex(s.end)
if lastLine == lie {
lie--
}
for l := lie; l >= lis; l-- {
c := math.Min(t.LineIndent(l), tabWidth)
if c > 0 {
ls := t.LineStart(l)
text, edit = t.ReplaceAt(text, ls, ls+c, []rune{})
edits = append(edits, edit)
}
}
lastLine = lis
}
t.SetTextEdits(text, edits)
}
func (t *TextBoxController) IndexRight(i int) int {
return math.Min(i+1, len(t.text))
}