378 lines
11 KiB
PHP
378 lines
11 KiB
PHP
<?php
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/**
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* DOMPDF - PHP5 HTML to PDF renderer
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*
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* File: $RCSfile: text_frame_reflower.cls.php,v $
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* Created on: 2004-06-17
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*
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* Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library in the file LICENSE.LGPL; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*
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* Alternatively, you may distribute this software under the terms of the
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* PHP License, version 3.0 or later. A copy of this license should have
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* been distributed with this file in the file LICENSE.PHP . If this is not
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* the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
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*
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* The latest version of DOMPDF might be available at:
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* http://www.digitaljunkies.ca/dompdf
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*
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* @link http://www.digitaljunkies.ca/dompdf
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* @copyright 2004 Benj Carson
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* @author Benj Carson <benjcarson@digitaljunkies.ca>
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* @package dompdf
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* @version 0.5.1
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*/
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/* $Id: text_frame_reflower.cls.php,v 1.8 2006/07/07 21:31:05 benjcarson Exp $ */
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/**
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* Reflows text frames.
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*
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* @access private
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* @package dompdf
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*/
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class Text_Frame_Reflower extends Frame_Reflower {
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protected $_block_parent; // Nearest block-level ancestor
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function __construct(Text_Frame_Decorator $frame) {
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parent::__construct($frame);
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$this->_block_parent = null;
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}
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//........................................................................
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protected function _collapse_white_space($text) {
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//$text = $this->_frame->get_text();
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if ( $this->_block_parent->get_current_line("w") == 0 )
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$text = ltrim($text, " \n\r\t");
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return preg_replace("/[\s\n]+/u", " ", $text);
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}
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//........................................................................
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protected function _line_break($text) {
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$style = $this->_frame->get_style();
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$size = $style->font_size;
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$font = $style->font_family;
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// Determine the available width
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$line_width = $this->_frame->get_containing_block("w");
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$current_line_width = $this->_block_parent->get_current_line("w");
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$available_width = $line_width - $current_line_width;
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// split the text into words
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$words = preg_split('/([\s-]+)/u', $text, -1, PREG_SPLIT_DELIM_CAPTURE);
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$wc = count($words);
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// Account for word-spacing
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$word_spacing = $style->length_in_pt($style->word_spacing);
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// Determine the frame width including margin, padding & border
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$text_width = Font_Metrics::get_text_width($text, $font, $size, $word_spacing);
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$mbp_width =
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$style->length_in_pt( array( $style->margin_left,
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$style->border_left_width,
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$style->padding_left,
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$style->padding_right,
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$style->border_right_width,
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$style->margin_right), $line_width );
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$frame_width = $text_width + $mbp_width;
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// Debugging:
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// pre_r("Text: '" . htmlspecialchars($text). "'");
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// pre_r("width: " .$frame_width);
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// pre_r("textwidth + delta: $text_width + $mbp_width");
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// pre_r("font-size: $size");
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// pre_r("cb[w]: " .$line_width);
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// pre_r("available width: " . $available_width);
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// pre_r("current line width: " . $current_line_width);
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// pre_r($words);
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if ( $frame_width <= $available_width )
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return false;
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// Determine the split point
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$width = 0;
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$str = "";
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reset($words);
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for ($i = 0; $i < count($words); $i += 2) {
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$word = $words[$i] . (isset($words[$i+1]) ? $words[$i+1] : "");
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$word_width = Font_Metrics::get_text_width($word, $font, $size, $word_spacing);
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if ( $width + $word_width + $mbp_width > $available_width )
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break;
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$width += $word_width;
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$str .= $word;
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}
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// The first word has overflowed. Force it onto the line
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if ( $current_line_width == 0 && $width == 0 ) {
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$width += $word_width;
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$str .= $word;
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}
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$offset = mb_strlen($str);
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// More debugging:
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// pre_var_dump($str);
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// pre_r("Width: ". $width);
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// pre_r("Offset: " . $offset);
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return $offset;
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}
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//........................................................................
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protected function _newline_break($text) {
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if ( ($i = mb_strpos($text, "\n")) === false)
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return false;
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return $i+1;
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}
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//........................................................................
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protected function _layout_line() {
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$style = $this->_frame->get_style();
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$text = $this->_frame->get_text();
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$size = $style->font_size;
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$font = $style->font_family;
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$word_spacing = $style->length_in_pt($style->word_spacing);
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// Determine the text height
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$style->height = Font_Metrics::get_font_height( $font, $size );
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$split = false;
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$add_line = false;
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// Handle white-space property:
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// http://www.w3.org/TR/CSS21/text.html#propdef-white-space
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switch ($style->white_space) {
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default:
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case "normal":
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$this->_frame->set_text( $text = $this->_collapse_white_space($text) );
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if ( $text == "" )
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break;
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$split = $this->_line_break($text);
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break;
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case "pre":
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$split = $this->_newline_break($text);
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$add_line = $split !== false;
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break;
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case "nowrap":
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$this->_frame->set_text( $text = $this->_collapse_white_space($text) );
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break;
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case "pre-wrap":
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$split = $this->_newline_break($text);
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if ( ($tmp = $this->_line_break($text)) !== false ) {
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$add_line = $split < $tmp;
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$split = min($tmp, $split);
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} else
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$add_line = true;
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break;
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case "pre-line":
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// Collapse white-space except for \n
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$this->_frame->set_text( $text = preg_replace( "/[ \t]+/u", " ", $text ) );
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if ( $text == "" )
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break;
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$split = $this->_newline_break($text);
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if ( ($tmp = $this->_line_break($text)) !== false ) {
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$add_line = $split < $tmp;
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$split = min($tmp, $split);
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} else
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$add_line = true;
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break;
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}
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// Handle degenerate case
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if ( $text === "" )
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return;
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if ( $split !== false) {
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// Handle edge cases
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if ( $split == 0 && $text == " " ) {
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$this->_frame->set_text("");
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return;
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}
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if ( $split == 0 ) {
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// Trim newlines from the beginning of the line
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//$this->_frame->set_text(ltrim($text, "\n\r"));
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$this->_block_parent->add_line();
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$this->_frame->position();
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// Layout the new line
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$this->_layout_line();
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} else if ( $split < mb_strlen($this->_frame->get_text()) ) {
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// split the line if required
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$this->_frame->split_text($split);
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// Remove any trailing newlines
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$t = $this->_frame->get_text();
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if ( $split > 1 && $t{$split-1} == "\n" )
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$this->_frame->set_text( mb_substr($t, 0, -1) );
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}
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if ( $add_line ) {
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$this->_block_parent->add_line();
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$this->_frame->position();
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}
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// Set our new width
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$width = Font_Metrics::get_text_width($this->_frame->get_text(), $font, $size, $word_spacing);
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$style->width = $width;
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} else {
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// Add the current frame to the line
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$width = Font_Metrics::get_text_width($text, $font, $size, $word_spacing);
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$style->width = $width;
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}
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}
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//........................................................................
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function reflow() {
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$this->_block_parent = $this->_frame->find_block_parent();
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$this->_frame->position();
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$this->_layout_line();
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}
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//........................................................................
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// Returns an array(0 => min, 1 => max, "min" => min, "max" => max) of the
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// minimum and maximum widths of this frame
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function get_min_max_width() {
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$style = $this->_frame->get_style();
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$this->_block_parent = $this->_frame->find_block_parent();
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$line_width = $this->_frame->get_containing_block("w");
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$str = $text = $this->_frame->get_text();
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$size = $style->font_size;
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$font = $style->font_family;
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$spacing = $style->length_in_pt($style->word_spacing);
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switch($style->white_space) {
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default:
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case "normal":
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$str = preg_replace("/[\s\n]+/u"," ", $str);
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case "pre-wrap":
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case "pre-line":
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// Find the longest word (i.e. minimum length)
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// This technique (using arrays & an anonymous function) is actually
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// faster than doing a single-pass character by character scan. Heh,
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// yes I took the time to bench it ;)
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$words = array_flip(preg_split("/[\s-]+/u",$str, -1, PREG_SPLIT_DELIM_CAPTURE));
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array_walk($words, create_function('&$val,$str',
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'$val = Font_Metrics::get_text_width($str, "'.$font.'", '.$size.', '.$spacing.');'));
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arsort($words);
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$min = reset($words);
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break;
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case "pre":
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$lines = array_flip(preg_split("/\n/u", $str));
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array_walk($lines, create_function('&$val,$str',
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'$val = Font_Metrics::get_text_width($str, "'.$font.'", '.$size.', '.$spacing.');'));
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arsort($lines);
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$min = reset($lines);
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break;
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case "nowrap":
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$min = Font_Metrics::get_text_width($this->_collapse_white_space($str), $font, $size, $spacing);
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break;
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}
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switch ($style->white_space) {
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default:
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case "normal":
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case "nowrap":
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$str = preg_replace("/[\s\n]+/u"," ", $text);
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break;
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case "pre-line":
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$str = preg_replace( "/[ \t]+/u", " ", $text);
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case "pre-wrap":
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// Find the longest word (i.e. minimum length)
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$lines = array_flip(preg_split("/\n/", $text));
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array_walk($lines, create_function('&$val,$str',
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'$val = Font_Metrics::get_text_width($str, "'.$font.'", '.$size.', '.$spacing.');'));
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arsort($lines);
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reset($lines);
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$str = key($lines);
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break;
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}
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$max = Font_Metrics::get_text_width($str, $font, $size, $spacing);
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$delta = $style->length_in_pt(array($style->margin_left,
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$style->border_left_width,
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$style->padding_left,
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$style->padding_right,
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$style->border_right_width,
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$style->margin_right), $line_width);
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$min += $delta;
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$max += $delta;
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return array($min, $max, "min" => $min, "max" => $max);
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}
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}
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?>
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