protected function _line_break($text)
{
$style = $this->_frame->get_style();
$size = $style->font_size;
$font = $style->font_family;
$current_line = $this->_block_parent->get_current_line_box();
// Determine the available width
$line_width = $this->_frame->get_containing_block("w");
$current_line_width = $current_line->left + $current_line->w + $current_line->right;
$available_width = $line_width - $current_line_width;
// Account for word-spacing
$word_spacing = $style->length_in_pt($style->word_spacing);
$char_spacing = $style->length_in_pt($style->letter_spacing);
// Determine the frame width including margin, padding & border
$text_width = $this->getFontMetrics()->getTextWidth($text, $font, $size, $word_spacing, $char_spacing);
$mbp_width = $style->length_in_pt(array($style->margin_left, $style->border_left_width, $style->padding_left, $style->padding_right, $style->border_right_width, $style->margin_right), $line_width);
$frame_width = $text_width + $mbp_width;
// Debugging:
// Helpers::pre_r("Text: '" . htmlspecialchars($text). "'");
// Helpers::pre_r("width: " .$frame_width);
// Helpers::pre_r("textwidth + delta: $text_width + $mbp_width");
// Helpers::pre_r("font-size: $size");
// Helpers::pre_r("cb[w]: " .$line_width);
// Helpers::pre_r("available width: " . $available_width);
// Helpers::pre_r("current line width: " . $current_line_width);
// Helpers::pre_r($words);
if ($frame_width <= $available_width) {
return false;
}
// split the text into words
$words = preg_split('/([\\s-]+)/u', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
$wc = count($words);
// Determine the split point
$width = 0;
$str = "";
reset($words);
// @todo support <shy>, <wbr>
for ($i = 0; $i < $wc; $i += 2) {
$word = $words[$i] . (isset($words[$i + 1]) ? $words[$i + 1] : "");
$word_width = $this->getFontMetrics()->getTextWidth($word, $font, $size, $word_spacing, $char_spacing);
if ($width + $word_width + $mbp_width > $available_width) {
break;
}
$width += $word_width;
$str .= $word;
}
$break_word = $style->word_wrap === "break-word";
// The first word has overflowed. Force it onto the line
if ($current_line_width == 0 && $width == 0) {
$s = "";
$last_width = 0;
if ($break_word) {
for ($j = 0; $j < strlen($word); $j++) {
$s .= $word[$j];
$_width = $this->getFontMetrics()->getTextWidth($s, $font, $size, $word_spacing, $char_spacing);
if ($_width > $available_width) {
break;
}
$last_width = $_width;
}
}
if ($break_word && $last_width > 0) {
$width += $last_width;
$str .= substr($s, 0, -1);
} else {
$width += $word_width;
$str .= $word;
}
}
$offset = mb_strlen($str);
// More debugging:
// var_dump($str);
// print_r("Width: ". $width);
// print_r("Offset: " . $offset);
return $offset;
}
/**
* Determine current frame width based on contents
*
* @return float
*/
public function calculate_auto_width()
{
return $this->_frame->recalculate_width();
}