func (item *simpleTextItem) AddNewPart(surface *drawing.Surface, bounds drawing.Rectangle) (part part, more bool, err os.Error) {
partCount := len(item.parts)
var offset int
if partCount > 0 {
prevPart := item.parts[len(item.parts)-1]
offset = prevPart.offset + prevPart.length
}
runeCount := item.text.RuneCount()
text := item.text.Slice(offset, runeCount)
fontHeight, err := surface.FontHeight(item.font)
if err != nil {
return
}
bounds.Height = (bounds.Height / fontHeight) * fontHeight
if bounds.Height == 0 {
more = true
return
}
boundsMeasured, runesFitted, err := surface.MeasureText(text, item.font, bounds, item.format)
if err != nil {
return
}
p := &simpleTextPart{
item: item,
offset: offset,
length: runesFitted,
bounds: boundsMeasured,
}
if partCount == cap(item.parts) {
parts := make([]*simpleTextPart, partCount, partCount*2)
copy(parts, item.parts)
item.parts = parts
}
item.parts = item.parts[0 : partCount+1]
item.parts[partCount] = p
part = p
more = p.offset+p.length < runeCount
return
}
