Size Font::get_text_size(Canvas &canvas, const std::string &text)
{
Size total_size;
if (impl)
{
FontMetrics fm = get_font_metrics();
int line_spacing = fm.get_external_leading();
std::vector<std::string> lines = StringHelp::split_text(text, "\n", false);
for (std::vector<std::string>::size_type i=0; i<lines.size(); i++)
{
Size line_size = impl->get_text_size(canvas, lines[i]);
if ((line_size.width == 0) && (line_size.height == 0) && (lines.size() > 1)) // blank line
line_size.height = fm.get_descent() + fm.get_ascent();
if ((i+1) != lines.size()) // Do not add the line spacing on the last line
line_size.height += line_spacing;
if (total_size.width < line_size.width) // Find the widest line
total_size.width = line_size.width;
total_size.height += line_size.height;
}
}
return total_size;
}
void Font::draw_text_ellipsis(Canvas &canvas, float dest_x, float dest_y, Rectf content_box, const std::string &text, const Colorf &color)
{
if (impl)
{
FontMetrics fm = get_font_metrics();
int ascent = fm.get_ascent();
int descent = fm.get_descent();
int line_spacing = fm.get_height() + fm.get_external_leading();
std::vector<std::string> lines = StringHelp::split_text(text, "\n", false);
for (std::vector<std::string>::size_type i=0; i<lines.size(); i++)
{
if (i == 0 || (dest_y - ascent >= content_box.top && dest_y + descent < content_box.bottom))
{
Size size = get_text_size(canvas, lines[i]);
if (dest_x + size.width <= content_box.right)
{
draw_text(canvas, dest_x, dest_y, lines[i], color);
}
else
{
Size ellipsis = get_text_size(canvas, "...");
int seek_start = 0;
int seek_end = lines[i].size();
int seek_center = (seek_start + seek_end) / 2;
UTF8_Reader utf8_reader(lines[i].data(), lines[i].length());
while (true)
{
utf8_reader.set_position(seek_center);
utf8_reader.move_to_leadbyte();
if (seek_center != utf8_reader.get_position())
utf8_reader.next();
seek_center = utf8_reader.get_position();
if (seek_center == seek_end)
break;
utf8_reader.set_position(seek_start);
utf8_reader.next();
if (utf8_reader.get_position() == seek_end)
break;
Size text_size = get_text_size(canvas, lines[i].substr(0, seek_center));
if (dest_x + text_size.width + ellipsis.width >= content_box.right)
seek_end = seek_center;
else
seek_start = seek_center;
seek_center = (seek_start+seek_end)/2;
}
draw_text(canvas, dest_x, dest_y, lines[i].substr(0, seek_center) + "...", color);
}
dest_y += line_spacing;
}
}
}
}
VerticalTextPosition GUIComponent::get_vertical_text_align(Canvas &canvas, const Rect &content_rect)
{
Font font = get_font();
// See diagram in: Documentation\Overview\fonts.html (Font Metrics)
FontMetrics metrics = font.get_font_metrics();
float align_height = metrics.get_ascent() - metrics.get_internal_leading();
float content_height = content_rect.get_height();
float baseline = (content_height + align_height) / 2.0f;
VerticalTextPosition result;
result.baseline = baseline + content_rect.top;
result.top = result.baseline - metrics.get_ascent();
result.bottom = result.baseline + metrics.get_descent();
return result;
}
std::string Font::get_clipped_text(Canvas &canvas, const Sizef &box_size, const std::string &text, const std::string &ellipsis_text)
{
std::string out_string;
out_string.reserve(text.length());
if (impl)
{
Pointf pos;
FontMetrics fm = get_font_metrics(canvas);
float descent = fm.get_descent();
float line_spacing = fm.get_line_height();
std::vector<std::string> lines = StringHelp::split_text(text, "\n", false);
for (std::vector<std::string>::size_type i = 0; i < lines.size(); i++)
{
if (i == 0 || pos.y + descent < box_size.height)
{
Sizef size = measure_text(canvas, lines[i]).bbox_size;
if (pos.x + size.width <= box_size.width)
{
if (!out_string.empty())
out_string += "\n";
out_string += lines[i];
}
else
{
Sizef ellipsis = measure_text(canvas, ellipsis_text).bbox_size;
int seek_start = 0;
int seek_end = lines[i].size();
int seek_center = (seek_start + seek_end) / 2;
UTF8_Reader utf8_reader(lines[i].data(), lines[i].length());
while (true)
{
utf8_reader.set_position(seek_center);
utf8_reader.move_to_leadbyte();
if (seek_center != utf8_reader.get_position())
utf8_reader.next();
seek_center = utf8_reader.get_position();
if (seek_center == seek_end)
break;
utf8_reader.set_position(seek_start);
utf8_reader.next();
if (utf8_reader.get_position() == seek_end)
break;
Sizef text_size = measure_text(canvas, lines[i].substr(0, seek_center)).bbox_size;
if (pos.x + text_size.width + ellipsis.width >= box_size.width)
seek_end = seek_center;
else
seek_start = seek_center;
seek_center = (seek_start + seek_end) / 2;
}
if (!out_string.empty())
out_string += "\n";
out_string += lines[i].substr(0, seek_center) + ellipsis_text;
}
pos.y += line_spacing;
}
}
}
return out_string;
}