bool
ParagraphLayout::_AppendGlyphInfos(const TextSpan& span)
{
int charCount = span.CountChars();
if (charCount == 0)
return true;
const BString& text = span.Text();
const BFont& font = span.Style().Font();
// Allocate arrays
float* escapementArray = new (std::nothrow) float[charCount];
if (escapementArray == NULL)
return false;
ArrayDeleter<float> escapementDeleter(escapementArray);
// Fetch glyph spacing information
font.GetEscapements(text, charCount, escapementArray);
// Append to glyph buffer and convert escapement scale
float size = font.Size();
const char* c = text.String();
for (int i = 0; i < charCount; i++) {
if (!_AppendGlyphInfo(UTF8ToCharCode(&c), escapementArray[i] * size,
span.Style())) {
return false;
}
}
return true;
}
bool
Paragraph::Append(const TextSpan& span)
{
// Try to merge with last span if the TextStyles are equal
if (fTextSpans.CountItems() > 0) {
const TextSpan& lastSpan = fTextSpans.LastItem();
if (lastSpan.Style() == span.Style()) {
BString text(lastSpan.Text());
text.Append(span.Text());
fTextSpans.Remove();
return fTextSpans.Add(TextSpan(text, span.Style()));
}
}
return fTextSpans.Add(span);
}
void
ParagraphLayout::_DrawSpan(BView* view, BPoint offset,
const TextSpan& span, int32 textOffset) const
{
const BString& text = span.Text();
if (text.Length() == 0)
return;
const GlyphInfo& glyph = fGlyphInfos.ItemAtFast(textOffset);
const LineInfo& line = fLineInfos.ItemAtFast(glyph.lineIndex);
offset.x += glyph.x;
offset.y += line.y + line.maxAscent;
const CharacterStyle& style = span.Style();
view->SetFont(&style.Font());
view->SetHighColor(style.ForegroundColor());
// TODO: Implement other style properties
escapement_delta delta;
delta.nonspace = line.extraGlyphSpacing;
delta.space = line.extraWhiteSpacing;
// TODO: Fix in app_server: First glyph should not be shifted by delta.
if (text[0] == ' ')
offset.x -= delta.space;
else
offset.x -= delta.nonspace;
view->DrawString(span.Text(), offset, &delta);
}
bool
Paragraph::Prepend(const TextSpan& span)
{
_InvalidateCachedLength();
// Try to merge with first span if the TextStyles are equal
if (fTextSpans.CountItems() > 0) {
const TextSpan& firstSpan = fTextSpans.ItemAtFast(0);
if (firstSpan.Style() == span.Style()) {
BString text(span.Text());
text.Append(firstSpan.Text());
return fTextSpans.Replace(0, TextSpan(text, span.Style()));
}
}
return fTextSpans.Add(span, 0);
}
bool
Paragraph::Insert(int32 offset, const TextSpan& newSpan)
{
_InvalidateCachedLength();
int32 index = 0;
while (index < fTextSpans.CountItems()) {
const TextSpan& span = fTextSpans.ItemAtFast(index);
if (offset - span.CountChars() < 0)
break;
offset -= span.CountChars();
index++;
}
if (fTextSpans.CountItems() == index)
return Append(newSpan);
// Try to merge with span at index if the TextStyles are equal
TextSpan span = fTextSpans.ItemAtFast(index);
if (span.Style() == newSpan.Style()) {
span.Insert(offset, newSpan.Text());
return fTextSpans.Replace(index, span);
}
if (offset == 0) {
if (index > 0) {
// Try to merge with TextSpan before if offset == 0 && index > 0
TextSpan span = fTextSpans.ItemAtFast(index - 1);
if (span.Style() == newSpan.Style()) {
span.Insert(span.CountChars(), newSpan.Text());
return fTextSpans.Replace(index - 1, span);
}
}
// Just insert the new span before the one at index
return fTextSpans.Add(newSpan, index);
}
// Split the span,
TextSpan spanBefore = span.SubSpan(0, offset);
TextSpan spanAfter = span.SubSpan(offset, span.CountChars() - offset);
return fTextSpans.Replace(index, spanBefore)
&& fTextSpans.Add(newSpan, index + 1)
&& fTextSpans.Add(spanAfter, index + 2);
}
void
ParagraphLayout::_DrawSpan(BView* view, const TextSpan& span,
int32 textOffset) const
{
const GlyphInfo& glyph = fGlyphInfos.ItemAtFast(textOffset);
const LineInfo& line = fLineInfos.ItemAtFast(glyph.lineIndex);
float x = glyph.x;
float y = line.y + line.maxAscent;
const CharacterStyle& style = span.Style();
view->SetFont(&style.Font());
view->SetHighColor(style.ForegroundColor());
// TODO: Implement other style properties
// TODO: Implement correct glyph spacing
view->DrawString(span.Text(), BPoint(x, y));
}
bool
Paragraph::Remove(int32 offset, int32 length)
{
if (length == 0)
return true;
_InvalidateCachedLength();
int32 index = 0;
while (index < fTextSpans.CountItems()) {
const TextSpan& span = fTextSpans.ItemAtFast(index);
if (offset - span.CountChars() < 0)
break;
offset -= span.CountChars();
index++;
}
if (index >= fTextSpans.CountItems())
return false;
TextSpan span(fTextSpans.ItemAtFast(index));
int32 removeLength = std::min(span.CountChars() - offset, length);
span.Remove(offset, removeLength);
length -= removeLength;
index += 1;
// Remove more spans if necessary
while (length > 0 && index < fTextSpans.CountItems()) {
int32 spanLength = fTextSpans.ItemAtFast(index).CountChars();
if (spanLength <= length) {
fTextSpans.Remove(index);
length -= spanLength;
} else {
// Reached last span
removeLength = std::min(length, spanLength);
TextSpan lastSpan = fTextSpans.ItemAtFast(index).SubSpan(
removeLength, spanLength - removeLength);
// Try to merge with first span, otherwise replace span at index
if (lastSpan.Style() == span.Style()) {
span.Insert(span.CountChars(), lastSpan.Text());
fTextSpans.Remove(index);
} else {
fTextSpans.Replace(index, lastSpan);
}
break;
}
}
// See if anything from the TextSpan at offset remained, keep it as empty
// span if it is the last remaining span.
index--;
if (span.CountChars() > 0 || fTextSpans.CountItems() == 1) {
fTextSpans.Replace(index, span);
} else {
fTextSpans.Remove(index);
index--;
}
// See if spans can be merged after one has been removed.
if (index >= 0 && index + 1 < fTextSpans.CountItems()) {
const TextSpan& span1 = fTextSpans.ItemAtFast(index);
const TextSpan& span2 = fTextSpans.ItemAtFast(index + 1);
if (span1.Style() == span2.Style()) {
span = span1;
span.Append(span2.Text());
fTextSpans.Replace(index, span);
fTextSpans.Remove(index + 1);
}
}
return true;
}