1<?php
2
3require_once(HTML2PS_DIR.'filter.post.positioned.class.php');
4
5class LayoutEngineDefault extends LayoutEngine {
6  function process(&$box, &$media, &$driver, &$context) {
7    // Calculate the size of text boxes
8    if (is_null($box->reflow_text($driver))) {
9      error_log("LayoutEngineDefault::process: reflow_text call failed");
10      return null;
11    };
12
13    // Explicitly remove any height declarations from the BODY-generated box;
14    // BODY should always fill last page completely. Percentage height of the BODY is meaningless
15    // on the paged media.
16    $box->_height_constraint = new HCConstraint(null, null, null);
17
18    $margin = $box->get_css_property(CSS_MARGIN);
19    $margin->calcPercentages(mm2pt($media->width() - $media->margins['left'] - $media->margins['right']));
20    $box->setCSSProperty(CSS_MARGIN, $margin);
21
22    $box->width = mm2pt($media->width() - $media->margins['left'] - $media->margins['right']) -
23      $box->_get_hor_extra();
24    $box->setCSSProperty(CSS_WIDTH, new WCConstant($box->width));
25
26    $box->height = mm2pt($media->real_height()) - $box->_get_vert_extra();
27
28    $box->put_top(mm2pt($media->height() -
29                        $media->margins['top']) -
30                  $box->get_extra_top());
31
32    $box->put_left(mm2pt($media->margins['left']) +
33                   $box->get_extra_left());
34
35
36    $flag = false;
37    $whitespace_flag = false;
38    $box->reflow_whitespace($flag, $whitespace_flag);
39
40    $box->pre_reflow_images();
41
42    $viewport = new FlowViewport();
43    $viewport->left   = mm2pt($media->margins['left']);
44    $viewport->top    = mm2pt($media->height() - $media->margins['top']);
45    $viewport->width  = mm2pt($media->width()  - $media->margins['left'] - $media->margins['right']);
46    $viewport->height = mm2pt($media->height() - $media->margins['top'] - $media->margins['bottom']);
47
48    $fake_parent = null;
49    $context->push_viewport($viewport);
50
51    $box->reflow($fake_parent, $context);
52
53    // Make the top-level box competely fill the last page
54    $page_real_height = mm2pt($media->real_height());
55
56    // Note we cannot have less than 1 page in our doc; max() call
57    // is required as we, in general, CAN have the content height strictly equal to 0.
58    // In this case wi still render the very first page
59    $pages = max(1,ceil($box->get_full_height() / $page_real_height));
60
61    /**
62     * Set body box height so it will fit the page exactly
63     */
64    $box->height = $pages * $page_real_height - $box->_get_vert_extra();
65
66    $driver->set_expected_pages($pages);
67
68    /**
69     * Flow absolute-positioned boxes;
70     * note that we should know the number of expected pages at this moment, unless
71     * we will not be able to calculate positions for elements using 'bottom: ...' CSS property
72     */
73    for ($i=0, $num_positioned = count($context->absolute_positioned); $i < $num_positioned; $i++) {
74      $context->push();
75      $context->absolute_positioned[$i]->reflow_absolute($context);
76      $context->pop();
77    };
78
79    // Flow fixed-positioned box
80    for ($i=0, $num_positioned = count($context->fixed_positioned); $i < $num_positioned; $i++) {
81      $context->push();
82      $context->fixed_positioned[$i]->reflow_fixed($context);
83      $context->pop();
84    };
85
86    $box->reflow_inline();
87
88    return true;
89  }
90}
91?>