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 *TextBox) updateHorizScrollLimit() {
maxWidth := t.MaxLineWidth()
size := t.Size().Contract(t.outer.Padding())
maxScroll := math.Max(maxWidth-size.W, 0)
math.Clamp(t.horizOffset, 0, maxScroll)
t.horizScroll.SetScrollLimit(maxWidth)
}
func (l *List) SetScrollOffset(scrollOffset int) {
if l.adapter == nil {
return
}
s := l.outer.Size().Contract(l.outer.Padding())
if l.orientation.Horizontal() {
maxScroll := math.Max(l.itemSize.W*l.itemCount-s.W, 0)
scrollOffset = math.Clamp(scrollOffset, 0, maxScroll)
l.scrollBar.SetScrollPosition(scrollOffset, scrollOffset+s.W)
} else {
maxScroll := math.Max(l.itemSize.H*l.itemCount-s.H, 0)
scrollOffset = math.Clamp(scrollOffset, 0, maxScroll)
l.scrollBar.SetScrollPosition(scrollOffset, scrollOffset+s.H)
}
if l.scrollOffset != scrollOffset {
l.scrollOffset = scrollOffset
l.LayoutChildren()
}
}
// 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 (p *PanelHolder) RemovePanel(panel gxui.Control) {
index := p.PanelIndex(panel)
if index < 0 {
panic("PanelHolder does not contain panel")
}
entry := p.entries[index]
entry.MouseDownSubscription.Unlisten()
p.entries = append(p.entries[:index], p.entries[index+1:]...)
p.tabLayout.RemoveChildAt(index)
if panel == p.selected.Panel {
if p.PanelCount() > 0 {
p.Select(math.Max(index-1, 0))
} else {
p.Select(-1)
}
}
}
func (l *List) DesiredSize(min, max math.Size) math.Size {
if l.adapter == nil {
return min
}
count := math.Max(l.itemCount, 1)
var s math.Size
if l.orientation.Horizontal() {
s = math.Size{W: l.itemSize.W * count, H: l.itemSize.H}
} else {
s = math.Size{W: l.itemSize.W, H: l.itemSize.H * count}
}
if l.scrollBarEnabled {
if l.orientation.Horizontal() {
s.H += l.scrollBar.DesiredSize(min, max).H
} else {
s.W += l.scrollBar.DesiredSize(min, max).W
}
}
return s.Expand(l.outer.Padding()).Clamp(min, max)
}
func (t *TextBoxAdapter) Count() int {
return math.Max(t.TextBox.controller.LineCount(), 1)
}
func (t *TextBoxController) IndexLeft(sel TextSelection) TextSelection {
sel.start = math.Max(sel.start-1, 0)
sel.end = math.Max(sel.end-1, 0)
return sel.Store()
}