func NewGUIListBox(id int, x, y, w, h float64, fnt *font.Font, color, highlightColor, spriteHighlightColor hge.Dword) *GUIListBox {
l := new(GUIListBox)
l.GUIObject.Initialize()
l.GUIObject.Id = id
l.GUIObject.Visible = true
l.GUIObject.Enabled = true
l.GUIObject.Rect.Set(x, y, x+w, y+h)
l.Font = fnt
l.highlight = sprite.New(nil, 0, 0, w, fnt.GetHeight())
l.highlight.SetColor(highlightColor)
l.color = color
l.highlightColor = highlightColor
l.List = list.New()
l.GUIObject.Render = func() {
item := l.List.Front()
for i := 0; i < l.topItem; i++ {
if item == nil {
return
}
item = item.Next()
}
for i := 0; i < l.NumRows(); i++ {
if i >= l.items {
return
}
if l.topItem+i == l.selectedItem {
l.highlight.Render(l.GUIObject.Rect.X1, l.GUIObject.Rect.Y1+float64(i)*l.Font.GetHeight())
l.Font.SetColor(l.highlightColor)
} else {
l.Font.SetColor(l.color)
}
l.Font.Render(l.GUIObject.Rect.X1+3, l.GUIObject.Rect.Y1+float64(i)*l.Font.GetHeight(), font.TEXT_LEFT, item.Value.(*guiListboxItem).text)
item = item.Next()
}
}
l.GUIObject.MouseMove = func(x, y float64) bool {
l.mx, l.my = x, y
return false
}
l.GUIObject.MouseLButton = func(down bool) bool {
if down {
item := l.topItem + int(l.my)/int(l.Font.GetHeight())
if item < l.Len() {
l.selectedItem = item
return true
}
}
return false
}
l.GUIObject.MouseWheel = func(notches int) bool {
l.topItem -= notches
if l.topItem < 0 {
l.topItem = 0
}
if l.topItem > l.Len()-l.NumRows() {
l.topItem = l.Len() - l.NumRows()
}
return true
}
l.GUIObject.KeyClick = func(key input.Key, chr int) bool {
switch key {
case input.K_DOWN:
if l.selectedItem < l.Len()-1 {
l.selectedItem++
if l.selectedItem > l.topItem+l.NumRows()-1 {
l.topItem = l.selectedItem - l.NumRows() + 1
}
return true
}
case input.K_UP:
if l.selectedItem > 0 {
l.selectedItem--
if l.selectedItem < l.topItem {
l.topItem = l.selectedItem
}
return true
}
}
return false
}
return l
}
