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Current File : /var/www/html/kalemon/public/certification/dompdf/src/FrameDecorator/Page.php
<?php
/**
 * @package dompdf
 * @link    http://dompdf.github.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 */
namespace Dompdf\FrameDecorator;

use Dompdf\Css\Style;
use Dompdf\Dompdf;
use Dompdf\Helpers;
use Dompdf\Frame;
use Dompdf\Renderer;

/**
 * Decorates frames for page layout
 *
 * @access  private
 * @package dompdf
 */
class Page extends AbstractFrameDecorator
{

    /**
     * y value of bottom page margin
     *
     * @var float
     */
    protected $_bottom_page_margin;

    /**
     * Flag indicating page is full.
     *
     * @var bool
     */
    protected $_page_full;

    /**
     * Number of tables currently being reflowed
     *
     * @var int
     */
    protected $_in_table;

    /**
     * The pdf renderer
     *
     * @var Renderer
     */
    protected $_renderer;

    /**
     * This page's floating frames
     *
     * @var array
     */
    protected $_floating_frames = [];

    //........................................................................

    /**
     * Class constructor
     *
     * @param Frame $frame the frame to decorate
     * @param Dompdf $dompdf
     */
    function __construct(Frame $frame, Dompdf $dompdf)
    {
        parent::__construct($frame, $dompdf);
        $this->_page_full = false;
        $this->_in_table = 0;
        $this->_bottom_page_margin = null;
    }

    /**
     * Set the renderer used for this pdf
     *
     * @param Renderer $renderer the renderer to use
     */
    function set_renderer($renderer)
    {
        $this->_renderer = $renderer;
    }

    /**
     * Return the renderer used for this pdf
     *
     * @return Renderer
     */
    function get_renderer()
    {
        return $this->_renderer;
    }

    /**
     * Set the frame's containing block.  Overridden to set $this->_bottom_page_margin.
     *
     * @param float $x
     * @param float $y
     * @param float $w
     * @param float $h
     */
    function set_containing_block($x = null, $y = null, $w = null, $h = null)
    {
        parent::set_containing_block($x, $y, $w, $h);
        //$w = $this->get_containing_block("w");
        if (isset($h)) {
            $this->_bottom_page_margin = $h;
        } // - $this->_frame->get_style()->length_in_pt($this->_frame->get_style()->margin_bottom, $w);
    }

    /**
     * Returns true if the page is full and is no longer accepting frames.
     *
     * @return bool
     */
    function is_full()
    {
        return $this->_page_full;
    }

    /**
     * Start a new page by resetting the full flag.
     */
    function next_page()
    {
        $this->_floating_frames = [];
        $this->_renderer->new_page();
        $this->_page_full = false;
    }

    /**
     * Indicate to the page that a table is currently being reflowed.
     */
    function table_reflow_start()
    {
        $this->_in_table++;
    }

    /**
     * Indicate to the page that table reflow is finished.
     */
    function table_reflow_end()
    {
        $this->_in_table--;
    }

    /**
     * Return whether we are currently in a nested table or not
     *
     * @return bool
     */
    function in_nested_table()
    {
        return $this->_in_table > 1;
    }

    /**
     * Check if a forced page break is required before $frame.  This uses the
     * frame's page_break_before property as well as the preceeding frame's
     * page_break_after property.
     *
     * @link http://www.w3.org/TR/CSS21/page.html#forced
     *
     * @param Frame $frame the frame to check
     *
     * @return bool true if a page break occured
     */
    function check_forced_page_break(Frame $frame)
    {
        // Skip check if page is already split
        if ($this->_page_full) {
            return null;
        }

        $block_types = ["block", "list-item", "table", "inline"];
        $page_breaks = ["always", "left", "right"];

        $style = $frame->get_style();

        if (!in_array($style->display, $block_types)) {
            return false;
        }

        // Find the previous block-level sibling
        $prev = $frame->get_prev_sibling();

        while ($prev && !in_array($prev->get_style()->display, $block_types)) {
            $prev = $prev->get_prev_sibling();
        }

        if (in_array($style->page_break_before, $page_breaks)) {
            // Prevent cascading splits
            $frame->split(null, true);
            // We have to grab the style again here because split() resets
            // $frame->style to the frame's original style.
            $frame->get_style()->page_break_before = "auto";
            $this->_page_full = true;
            $frame->_already_pushed = true;

            return true;
        }

        if ($prev && in_array($prev->get_style()->page_break_after, $page_breaks)) {
            // Prevent cascading splits
            $frame->split(null, true);
            $prev->get_style()->page_break_after = "auto";
            $this->_page_full = true;
            $frame->_already_pushed = true;

            return true;
        }

        if ($prev && $prev->get_last_child() && $frame->get_node()->nodeName != "body") {
            $prev_last_child = $prev->get_last_child();
            if (in_array($prev_last_child->get_style()->page_break_after, $page_breaks)) {
                $frame->split(null, true);
                $prev_last_child->get_style()->page_break_after = "auto";
                $this->_page_full = true;
                $frame->_already_pushed = true;

                return true;
            }
        }

        return false;
    }

    /**
     * Determine if a page break is allowed before $frame
     * http://www.w3.org/TR/CSS21/page.html#allowed-page-breaks
     *
     * In the normal flow, page breaks can occur at the following places:
     *
     *    1. In the vertical margin between block boxes. When a page
     *    break occurs here, the used values of the relevant
     *    'margin-top' and 'margin-bottom' properties are set to '0'.
     *    2. Between line boxes inside a block box.
     *    3. Between the content edge of a block container box and the
     *    outer edges of its child content (margin edges of block-level
     *    children or line box edges for inline-level children) if there
     *    is a (non-zero) gap between them.
     *
     * These breaks are subject to the following rules:
     *
     *   * Rule A: Breaking at (1) is allowed only if the
     *     'page-break-after' and 'page-break-before' properties of
     *     all the elements generating boxes that meet at this margin
     *     allow it, which is when at least one of them has the value
     *     'always', 'left', or 'right', or when all of them are
     *     'auto'.
     *
     *   * Rule B: However, if all of them are 'auto' and the
     *     nearest common ancestor of all the elements has a
     *     'page-break-inside' value of 'avoid', then breaking here is
     *     not allowed.
     *
     *   * Rule C: Breaking at (2) is allowed only if the number of
     *     line boxes between the break and the start of the enclosing
     *     block box is the value of 'orphans' or more, and the number
     *     of line boxes between the break and the end of the box is
     *     the value of 'widows' or more.
     *
     *   * Rule D: In addition, breaking at (2) is allowed only if
     *     the 'page-break-inside' property is 'auto'.
     *
     * If the above doesn't provide enough break points to keep
     * content from overflowing the page boxes, then rules B and D are
     * dropped in order to find additional breakpoints.
     *
     * If that still does not lead to sufficient break points, rules A
     * and C are dropped as well, to find still more break points.
     *
     * We will also allow breaks between table rows.  However, when
     * splitting a table, the table headers should carry over to the
     * next page (but they don't yet).
     *
     * @param Frame $frame the frame to check
     *
     * @return bool true if a break is allowed, false otherwise
     */
    protected function _page_break_allowed(Frame $frame)
    {
        $block_types = ["block", "list-item", "table", "-dompdf-image"];
        Helpers::dompdf_debug("page-break", "_page_break_allowed(" . $frame->get_node()->nodeName . ")");
        $display = $frame->get_style()->display;

        // Block Frames (1):
        if (in_array($display, $block_types)) {

            // Avoid breaks within table-cells
            if ($this->_in_table > ($display === "table" ? 1 : 0)) {
                Helpers::dompdf_debug("page-break", "In table: " . $this->_in_table);

                return false;
            }

            // Rules A & B

            if ($frame->get_style()->page_break_before === "avoid") {
                Helpers::dompdf_debug("page-break", "before: avoid");

                return false;
            }

            // Find the preceeding block-level sibling
            $prev = $frame->get_prev_sibling();
            while ($prev && !in_array($prev->get_style()->display, $block_types)) {
                $prev = $prev->get_prev_sibling();
            }

            // Does the previous element allow a page break after?
            if ($prev && $prev->get_style()->page_break_after === "avoid") {
                Helpers::dompdf_debug("page-break", "after: avoid");

                return false;
            }

            // If both $prev & $frame have the same parent, check the parent's
            // page_break_inside property.
            $parent = $frame->get_parent();
            if ($prev && $parent && $parent->get_style()->page_break_inside === "avoid") {
                Helpers::dompdf_debug("page-break", "parent inside: avoid");

                return false;
            }

            // To prevent cascading page breaks when a top-level element has
            // page-break-inside: avoid, ensure that at least one frame is
            // on the page before splitting.
            if ($parent->get_node()->nodeName === "body" && !$prev) {
                // We are the body's first child
                Helpers::dompdf_debug("page-break", "Body's first child.");

                return false;
            }

            // If the frame is the first block-level frame, only allow a page
            // break if there is a (non-zero) gap between the frame and its
            // parent
            if (!$prev && $parent) {
                Helpers::dompdf_debug("page-break", "First block level frame, checking gap");

                return $frame->get_style()->length_in_pt($frame->get_style()->margin_top) != 0
                    || $parent->get_style()->length_in_pt($parent->get_style()->padding_top) != 0;
            }

            Helpers::dompdf_debug("page-break", "block: break allowed");

            return true;

        } // Inline frames (2):
        else {
            if (in_array($display, Style::$INLINE_TYPES)) {

                // Avoid breaks within table-cells
                if ($this->_in_table) {
                    Helpers::dompdf_debug("page-break", "In table: " . $this->_in_table);

                    return false;
                }

                // Rule C
                $block_parent = $frame->find_block_parent();
                if (count($block_parent->get_line_boxes()) < $frame->get_style()->orphans) {
                    Helpers::dompdf_debug("page-break", "orphans");

                    return false;
                }

                // FIXME: Checking widows is tricky without having laid out the
                // remaining line boxes.  Just ignore it for now...

                // Rule D
                $p = $block_parent;
                while ($p) {
                    if ($p->get_style()->page_break_inside === "avoid") {
                        Helpers::dompdf_debug("page-break", "parent->inside: avoid");

                        return false;
                    }
                    $p = $p->find_block_parent();
                }

                // To prevent cascading page breaks when a top-level element has
                // page-break-inside: avoid, ensure that at least one frame with
                // some content is on the page before splitting.
                $prev = $frame->get_prev_sibling();
                while ($prev && ($prev->is_text_node() && trim($prev->get_node()->nodeValue) == "")) {
                    $prev = $prev->get_prev_sibling();
                }

                if ($block_parent->get_node()->nodeName === "body" && !$prev) {
                    // We are the body's first child
                    Helpers::dompdf_debug("page-break", "Body's first child.");

                    return false;
                }

                // Skip breaks on empty text nodes
                if ($frame->is_text_node() && $frame->get_node()->nodeValue == "") {
                    return false;
                }

                Helpers::dompdf_debug("page-break", "inline: break allowed");

                return true;

            // Table-rows
            } else {
                if ($display === "table-row") {
                    // Simply check if the parent table's page_break_inside property is
                    // not 'avoid'
                    $table = Table::find_parent_table($frame);

                    $p = $table;
                    while ($p) {
                        if ($p->get_style()->page_break_inside === "avoid") {
                            Helpers::dompdf_debug("page-break", "parent->inside: avoid");

                            return false;
                        }
                        $p = $p->find_block_parent();
                    }

                    // Avoid breaking before the first row of a table
                    if ($table && $table->get_first_child() === $frame || $table->get_first_child()->get_first_child() === $frame) {
                        Helpers::dompdf_debug("page-break", "table: first-row");

                        return false;
                    }

                    // If this is a nested table, prevent the page from breaking
                    if ($this->_in_table > 1) {
                        Helpers::dompdf_debug("page-break", "table: nested table");

                        return false;
                    }

                    Helpers::dompdf_debug("page-break", "table-row/row-groups: break allowed");

                    return true;
                } else {
                    if (in_array($display, Table::$ROW_GROUPS)) {

                        // Disallow breaks at row-groups: only split at row boundaries
                        return false;

                    } else {
                        Helpers::dompdf_debug("page-break", "? " . $frame->get_style()->display . "");

                        return false;
                    }
                }
            }
        }
    }

    /**
     * Check if $frame will fit on the page.  If the frame does not fit,
     * the frame tree is modified so that a page break occurs in the
     * correct location.
     *
     * @param Frame $frame the frame to check
     *
     * @return bool
     */
    function check_page_break(Frame $frame)
    {
        if ($this->_page_full || $frame->_already_pushed) {
            return false;
        }

        $p = $frame;
        do {
            $display = $p->get_style()->display;
            if ($display == "table-row") {
                if ($p->_already_pushed) { return false; }
            }
        } while ($p = $p->get_parent());

        // If the frame is absolute or fixed it shouldn't break
        $p = $frame;
        do {
            if ($p->is_absolute()) {
                return false;
            }
        } while ($p = $p->get_parent());

        $margin_height = $frame->get_margin_height();

        // Determine the frame's maximum y value
        $max_y = (float)$frame->get_position("y") + $margin_height;

        // If a split is to occur here, then the bottom margins & paddings of all
        // parents of $frame must fit on the page as well:
        $p = $frame->get_parent();
        while ($p) {
            $max_y += (float) $p->get_style()->computed_bottom_spacing();
            $p = $p->get_parent();
        }

        // Check if $frame flows off the page
        if ($max_y <= $this->_bottom_page_margin) {
            // no: do nothing
            return false;
        }

        Helpers::dompdf_debug("page-break", "check_page_break");
        Helpers::dompdf_debug("page-break", "in_table: " . $this->_in_table);

        // yes: determine page break location
        $iter = $frame;
        $flg = false;
        $pushed_flg = false;

        $in_table = $this->_in_table;

        Helpers::dompdf_debug("page-break", "Starting search");
        while ($iter) {
            // echo "\nbacktrack: " .$iter->get_node()->nodeName ." ".spl_object_hash($iter->get_node()). "";
            if ($iter === $this) {
                Helpers::dompdf_debug("page-break", "reached root.");
                // We've reached the root in our search.  Just split at $frame.
                break;
            }

            if ($iter->_already_pushed) {
                $pushed_flg = true;
            } elseif ($this->_page_break_allowed($iter)) {
                Helpers::dompdf_debug("page-break", "break allowed, splitting.");
                $iter->split(null, true);
                $this->_page_full = true;
                $this->_in_table = $in_table;
                $iter->_already_pushed = true;
                $frame->_already_pushed = true;

                return true;
            }

            if (!$flg && $next = $iter->get_last_child()) {
                Helpers::dompdf_debug("page-break", "following last child.");

                if ($next->is_table()) {
                    $this->_in_table++;
                }

                $iter = $next;
                $pushed_flg = false;
                continue;
            }

            if ($pushed_flg) {
                // The frame was already pushed, avoid breaking on a previous page
                break;
            }

            if ($next = $iter->get_prev_sibling()) {
                Helpers::dompdf_debug("page-break", "following prev sibling.");

                if ($next->is_table() && !$iter->is_table()) {
                    $this->_in_table++;
                } else if (!$next->is_table() && $iter->is_table()) {
                    $this->_in_table--;
                }

                $iter = $next;
                $flg = false;
                continue;
            }

            if ($next = $iter->get_parent()) {
                Helpers::dompdf_debug("page-break", "following parent.");

                if ($iter->is_table()) {
                    $this->_in_table--;
                }

                $iter = $next;
                $flg = true;
                continue;
            }

            break;
        }

        $this->_in_table = $in_table;

        // No valid page break found.  Just break at $frame.
        Helpers::dompdf_debug("page-break", "no valid break found, just splitting.");

        // If we are in a table, backtrack to the nearest top-level table row
        if ($this->_in_table) {
            $iter = $frame;
            while ($iter && $iter->get_style()->display !== "table-row" && $iter->get_style()->display !== 'table-row-group' && $iter->_already_pushed === false) {
                $iter = $iter->get_parent();
            }

            if ($iter) {
                $iter->split(null, true);
                $iter->_already_pushed = true;
            } else {
                return false;
            }
        } else {
            $frame->split(null, true);
        }

        $this->_page_full = true;
        $frame->_already_pushed = true;

        return true;
    }

    //........................................................................

    /**
     * @param Frame|null $frame
     * @param bool $force_pagebreak
     */
    function split(Frame $frame = null, $force_pagebreak = false)
    {
        // Do nothing
    }

    /**
     * Add a floating frame
     *
     * @param Frame $frame
     *
     * @return void
     */
    function add_floating_frame(Frame $frame)
    {
        array_unshift($this->_floating_frames, $frame);
    }

    /**
     * @return Frame[]
     */
    function get_floating_frames()
    {
        return $this->_floating_frames;
    }

    /**
     * @param $key
     */
    public function remove_floating_frame($key)
    {
        unset($this->_floating_frames[$key]);
    }

    /**
     * @param Frame $child
     * @return int|mixed
     */
    public function get_lowest_float_offset(Frame $child)
    {
        $style = $child->get_style();
        $side = $style->clear;
        $float = $style->float;

        $y = 0;

        if ($float === "none") {
            foreach ($this->_floating_frames as $key => $frame) {
                if ($side === "both" || $frame->get_style()->float === $side) {
                    $y = max($y, $frame->get_position("y") + $frame->get_margin_height());
                }
                $this->remove_floating_frame($key);
            }
        }

        if ($y > 0) {
            $y++; // add 1px buffer from float
        }

        return $y;
    }
}

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