int CharacterIterator::previous()
{
int previous = m_index - 1;
if (previous >= 0) {
m_utf16Index = max(m_utf16Index - characterSize(previous), 0);
m_index = previous;
} else {
m_index = TextBreakDone;
m_utf16Index = TextBreakDone;
}
return m_index;
}
int CharacterIterator::next()
{
int next = m_index + 1;
if (next <= m_length) {
m_utf16Index = min(m_utf16Index + characterSize(m_index), m_utf16Length);
m_index = next;
} else {
m_index = TextBreakDone;
m_utf16Index = TextBreakDone;
}
return m_index;
}
KDPoint KDContext::writeString(const char * text, KDPoint p, KDText::FontSize size, KDColor textColor, KDColor backgroundColor, int maxLength, bool transparentBackground) {
KDPoint position = p;
int characterWidth = size == KDText::FontSize::Large ? BITMAP_LargeFont_CHARACTER_WIDTH : BITMAP_SmallFont_CHARACTER_WIDTH;
int characterHeight = size == KDText::FontSize::Large ? BITMAP_LargeFont_CHARACTER_HEIGHT: BITMAP_SmallFont_CHARACTER_HEIGHT;
KDPoint characterSize(characterWidth, 0);
const char * end = text+maxLength;
while(*text != 0 && text != end) {
writeChar(*text, position, size, textColor, backgroundColor, transparentBackground);
if (*text == '\n') {
position = KDPoint(0, position.y()+characterHeight);
} else if (*text == '\t') {
position = position.translatedBy(KDPoint(KDText::k_tabCharacterWidth*characterWidth, 0));
} else {
position = position.translatedBy(characterSize);
}
text++;
}
return position;
}
void CharacterIterator::setUTF16Index(int index)
{
if (index == m_utf16Index)
return;
if (index <= 0)
m_utf16Index = m_index = 0;
else if (index >= m_utf16Length) {
m_utf16Index = m_utf16Length;
m_index = m_length;
} else if (m_length == m_utf16Length)
m_utf16Index = m_index = index;
else {
m_utf16Index = index;
int utf16Index = 0;
int utf8Index = 0;
while (utf16Index < index) {
utf16Index += characterSize(utf8Index);
utf8Index++;
}
m_index = utf8Index;
}
}
