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) indexUp(i, stored int) int {
line := t.LineIndex(i)
storedLine := t.LineIndex(stored)
x := stored - t.LineStart(storedLine)
if line > 0 {
return math.Min(t.LineStart(line-1)+x, t.LineEnd(line-1))
}
return 0
}
// TODO: figure out why pressing down at the end of the file goes back one character
func (t *TextBoxController) indexDown(i, stored int) int {
line := t.LineIndex(i)
storedLine := t.LineIndex(stored)
x := stored - t.LineStart(storedLine)
if line < t.LineCount()-1 {
return math.Min(t.LineStart(line+1)+x, t.LineEnd(line+1))
}
return len(t.text) - 1
}
// 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) IndexRight(sel TextSelection) TextSelection {
sel.start = math.Min(sel.start+1, len(t.text))
sel.end = math.Min(sel.end+1, len(t.text))
return sel.Store()
}