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<?php namespace Imagely\NGG\Display; /** * View element for building display structures. / class ViewElement { /* * Element ID. * * @var string / protected $id; /* * Element type. * * @var string\|null / protected $type; /* * List of child elements. * * @var array / protected $list; /* * Element context data. * * @var array / protected $context; /* * Constructor. * * @param string $id The element ID. * @param string\|null $type The element type. / public function __construct( $id, $type = null ) { $this->id = $id; $this->type = $type; $this->list = []; $this->context = []; } /* * Get the element ID. * * @return string The element ID. / public function get_id() { return $this->id; } /* * Append a child element. * * @param mixed $child The child element to append. / public function append( $child ) { $this->list[] = $child; } /* * Insert a child element at a specific position. * * @param mixed $child The child element to insert. * @param int $position The position to insert at. / public function insert( $child, $position = 0 ) { array_splice( $this->list, $position, 0, $child ); } /* * Delete a child element. * * @param mixed $child The child element to delete. / public function delete( $child ) { $index = array_search( $child, $this->list, true ); if ( false !== $index ) { array_splice( $this->list, $index, 1 ); } } /* * Find elements by ID. * * @param string $id The ID to find. * @param bool $recurse Whether to search recursively. * @return array Found elements. / public function find( $id, $recurse = false ) { $list = []; $this->_find( $list, $id, $recurse ); return $list; } /* * Internal find helper method. * * @param array $found_list Reference to list to populate with found elements. * @param string $id The ID to find. * @param bool $recurse Whether to search recursively. / public function _find( array &$found_list, $id, $recurse = false ) { foreach ( $this->list as $index => $element ) { if ( $element instanceof ViewElement ) { if ( $element->get_id() == $id ) { $found_list[] = $element; } if ( $recurse ) { $element->_find( $found_list, $id, $recurse ); } } } } /* * Get a context value by name. * * @param string $name The context name. * @return mixed\|null The context value or null if not found. / public function get_context( $name ) { if ( isset( $this->context[ $name ] ) ) { return $this->context[ $name ]; } return null; } /* * Set a context value. * * @param string $name The context name. * @param mixed $value The context value. / public function set_context( $name, $value ) { $this->context[ $name ] = $value; } /* * Get the object from context. * * @return mixed\|null The object or null if not found. / public function get_object() { return $this->get_context( 'object' ); } /* * Rasterize the element tree to a string. * * @return string\|null The rasterized output. */ public function rasterize() { $ret = null; foreach ( $this->list as $index => $element ) { if ( $element instanceof ViewElement ) { $ret .= $element->rasterize(); } else { $ret .= (string) $element; } } return $ret; } }

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