121 lines
3.2 KiB
PHP
121 lines
3.2 KiB
PHP
<?php
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// $Header: /cvsroot/html2ps/box.whitespace.php,v 1.33 2007/01/24 18:55:46 Konstantin Exp $
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class WhitespaceBox extends TextBox {
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function &create(&$pipeline) {
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$box =& new WhitespaceBox();
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$box->readCSS($pipeline->getCurrentCSSState());
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$box->add_subword(" ", 'iso-8859-1', array());
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return $box;
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}
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function readCSS(&$state) {
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parent::readCSS($state);
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$this->_readCSSLengths($state,
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array(CSS_WORD_SPACING));
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}
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function get_extra_bottom() {
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return 0;
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}
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// "Pure" Text boxes never have margins/border/padding
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function get_extra_left() {
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return 0;
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}
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// "Pure" Text boxes never have margins/border/padding
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function get_extra_right() {
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return 0;
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}
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function get_extra_top() {
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return 0;
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}
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function get_full_width() {
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return $this->width;
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}
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function get_margin_top() {
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return 0;
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}
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function get_min_width(&$context) {
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return $this->width;
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}
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function get_max_width(&$context) {
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return $this->width;
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}
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function WhitespaceBox() {
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// Call parent constructor
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$this->TextBox();
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}
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// (!) SIDE EFFECT: current whitespace box can be replaced by a null box during reflow.
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// callers of reflow should take this into account and possilby check for this
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// after reflow returns. This can be detected by UID change.
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//
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function reflow(&$parent, &$context) {
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// Check if there are any boxes in parent's line box
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if ($parent->line_box_empty()) {
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// The very first whitespace in the line box should not affect neither height nor baseline of the line box;
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// because following boxes can be smaller that assumed whitespace height
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// Example: <br>[whitespace]<img height="2" width="2"><br>; whitespace can overextend this line
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$this->width = 0;
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$this->height = 0;
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} elseif (is_a($parent->last_in_line(),"WhitespaceBox")) {
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// Duplicate whitespace boxes should not offset further content and affect the line box length
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$this->width = 0;
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$this->height = 0;
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} elseif ($this->maybe_line_break($parent, $context)) {
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$this->width = 0;
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$this->height = 0;
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};
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parent::reflow($parent, $context);
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}
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function reflow_text(&$driver) {
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if (is_null(parent::reflow_text($driver))) {
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return null;
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};
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// Override widths
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$letter_spacing = $this->getCSSProperty(CSS_LETTER_SPACING);
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$word_spacing = $this->getCSSProperty(CSS_WORD_SPACING);
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$this->width =
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$this->height * WHITESPACE_FONT_SIZE_FRACTION +
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$letter_spacing->getPoints() +
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$word_spacing->getPoints();
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return true;
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}
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function reflow_whitespace(&$linebox_started, &$previous_whitespace) {
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if (!$linebox_started ||
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($linebox_started && $previous_whitespace)) {
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$link_destination = $this->getCSSProperty(CSS_HTML2PS_LINK_DESTINATION);
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if ($link_destination == "") {
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$this->parent->remove($this);
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} else {
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$this->font_height = 0.001;
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$this->height = 0;
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$this->width = 0;
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};
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};
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$previous_whitespace = true;
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// Note that there can (in theory) several whitespaces in a row, so
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// we could not modify a flag until we met a real text box
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}
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}
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?>
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