Пример #1
0
function &create_node_box(&$root, &$pipeline)
{
    // Determine CSS proerty value for current child
    $css_state =& $pipeline->get_current_css_state();
    $css_state->pushDefaultState();
    $default_css = $pipeline->get_default_css();
    $default_css->apply($root, $css_state, $pipeline);
    // Store the default 'display' value; we'll need it later when checking for impossible tag/display combination
    $handler =& CSS::get_handler(CSS_DISPLAY);
    $default_display = $handler->get($css_state->getState());
    // Initially generated boxes do not require block wrappers
    // Block wrappers are required in following cases:
    // - float property is specified for non-block box which cannot be directly converted to block box
    //   (a button, for example)
    // - display set to block for such box
    $need_block_wrapper = false;
    // TODO: some inheritance magic
    // Order is important. Items with most priority should be applied last
    // Tag attributes
    execute_attrs_before($root, $pipeline);
    // CSS stylesheet
    $css =& $pipeline->get_current_css();
    $css->apply($root, $css_state, $pipeline);
    // values from 'style' attribute
    if ($root->has_attribute("style")) {
        parse_style_attr($root, $css_state, $pipeline);
    }
    _fix_tag_display($default_display, $css_state, $pipeline);
    execute_attrs_after_styles($root, $pipeline);
    // CSS 2.1:
    // 9.7 Relationships between 'display', 'position', and 'float'
    // The three properties that affect box generation and layout —
    // 'display', 'position', and 'float' — interact as follows:
    // 1. If 'display' has the value 'none', then 'position' and 'float' do not apply.
    //    In this case, the element generates no box.
    $position_handler =& CSS::get_handler(CSS_POSITION);
    $float_handler =& CSS::get_handler(CSS_FLOAT);
    // 2. Otherwise, if 'position' has the value 'absolute' or 'fixed', the box is absolutely positioned,
    //    the computed value of 'float' is 'none', and display is set according to the table below.
    //    The position of the box will be determined by the 'top', 'right', 'bottom' and 'left' properties and
    //    the box's containing block.
    $position = $css_state->get_property(CSS_POSITION);
    if ($position === CSS_PROPERTY_INHERIT) {
        $position = $css_state->getInheritedProperty(CSS_POSITION);
    }
    if ($position === POSITION_ABSOLUTE || $position === POSITION_FIXED) {
        $float_handler->replace(FLOAT_NONE, $css_state);
        $need_block_wrapper |= _fix_display_position_float($css_state);
    }
    // 3. Otherwise, if 'float' has a value other than 'none', the box is floated and 'display' is set
    //    according to the table below.
    $float = $css_state->get_property(CSS_FLOAT);
    if ($float != FLOAT_NONE) {
        $need_block_wrapper |= _fix_display_position_float($css_state);
    }
    // Process some special nodes, which should not get their 'display' values overwritten (unless
    // current display value is 'none'
    $current_display = $css_state->get_property(CSS_DISPLAY);
    if ($current_display != 'none') {
        switch ($root->tagname()) {
            case 'body':
                $handler =& CSS::get_handler(CSS_DISPLAY);
                $handler->css('-body', $pipeline);
                break;
            case 'br':
                $handler =& CSS::get_handler(CSS_DISPLAY);
                $handler->css('-break', $pipeline);
                break;
            case 'img':
                $handler =& CSS::get_handler(CSS_DISPLAY);
                $need_block_wrapper |= $handler->get($css_state->getState()) == 'block';
                $handler->css('-image', $pipeline);
                break;
        }
    }
    // 4. Otherwise, if the element is the root element, 'display' is set according to the table below.
    // 5. Otherwise, the remaining 'display' property values apply as specified. (see _fix_display_position_float)
    switch ($css_state->get_property(CSS_DISPLAY)) {
        case 'block':
            $box =& BlockBox::create($root, $pipeline);
            break;
        case '-break':
            $box =& BRBox::create($pipeline);
            break;
        case '-body':
            $box =& BodyBox::create($root, $pipeline);
            break;
        case '-button':
            $box =& ButtonBox::create($root, $pipeline);
            break;
        case '-button-reset':
            $box =& ButtonResetBox::create($root, $pipeline);
            break;
        case '-button-submit':
            $box =& ButtonSubmitBox::create($root, $pipeline);
            break;
        case '-button-image':
            $box =& ButtonImageBox::create($root, $pipeline);
            break;
        case '-checkbox':
            $box =& CheckBox::create($root, $pipeline);
            break;
        case '-form':
            $box =& FormBox::create($root, $pipeline);
            break;
        case '-frame':
            inc_frame_level();
            $box =& FrameBox::create($root, $pipeline);
            dec_frame_level();
            break;
        case '-frameset':
            inc_frame_level();
            $box =& FramesetBox::create($root, $pipeline);
            dec_frame_level();
            break;
        case '-iframe':
            inc_frame_level();
            $box =& IFrameBox::create($root, $pipeline);
            dec_frame_level();
            break;
        case '-textarea':
            $box =& TextAreaInputBox::create($root, $pipeline);
            break;
        case '-image':
            $box =& IMGBox::create($root, $pipeline);
            break;
        case 'inline':
            $box =& InlineBox::create($root, $pipeline);
            break;
        case 'inline-block':
            $box =& InlineBlockBox::create($root, $pipeline);
            break;
        case '-legend':
            $box =& LegendBox::create($root, $pipeline);
            break;
        case 'list-item':
            $box =& ListItemBox::create($root, $pipeline);
            break;
        case 'none':
            $box =& NullBox::create();
            break;
        case '-radio':
            $box =& RadioBox::create($root, $pipeline);
            break;
        case '-select':
            $box =& SelectBox::create($root, $pipeline);
            break;
        case 'table':
            $box =& TableBox::create($root, $pipeline);
            break;
        case 'table-cell':
            $box =& TableCellBox::create($root, $pipeline);
            break;
        case 'table-row':
            $box =& TableRowBox::create($root, $pipeline);
            break;
        case 'table-row-group':
        case 'table-header-group':
        case 'table-footer-group':
            $box =& TableSectionBox::create($root, $pipeline);
            break;
        case '-text':
            $box =& TextInputBox::create($root, $pipeline);
            break;
        case '-password':
            $box =& PasswordInputBox::create($root, $pipeline);
            break;
        default:
            /**
             * If 'display' value is invalid or unsupported, fall back to 'block' mode
             */
            error_log("Unsupported 'display' value: " . $css_state->get_property(CSS_DISPLAY));
            $box =& BlockBox::create($root, $pipeline);
            break;
    }
    // Now check if pseudoelement should be created; in this case we'll use the "inline wrapper" box
    // containing both generated box and pseudoelements
    //
    $pseudoelements = $box->get_css_property(CSS_HTML2PS_PSEUDOELEMENTS);
    if ($pseudoelements & CSS_HTML2PS_PSEUDOELEMENTS_BEFORE) {
        // Check if :before preudoelement exists
        $before =& create_pdf_pseudoelement($root, SELECTOR_PSEUDOELEMENT_BEFORE, $pipeline);
        if (!is_null($before)) {
            $box->insert_child(0, $before);
        }
    }
    if ($pseudoelements & CSS_HTML2PS_PSEUDOELEMENTS_AFTER) {
        // Check if :after pseudoelement exists
        $after =& create_pdf_pseudoelement($root, SELECTOR_PSEUDOELEMENT_AFTER, $pipeline);
        if (!is_null($after)) {
            $box->add_child($after);
        }
    }
    // Check if this box needs a block wrapper (for example, floating button)
    // Note that to keep float/position information, we clear the CSS stack only
    // AFTER the wrapper box have been created; BUT we should clear the following CSS properties
    // to avoid the fake wrapper box actually affect the layout:
    // - margin
    // - border
    // - padding
    // - background
    //
    if ($need_block_wrapper) {
        /**
         * Clear POSITION/FLOAT properties on wrapped boxes
         */
        $box->setCSSProperty(CSS_POSITION, POSITION_STATIC);
        $box->setCSSProperty(CSS_POSITION, FLOAT_NONE);
        $wc = $box->get_css_property(CSS_WIDTH);
        // Note that if element width have been set as a percentage constraint and we're adding a block wrapper,
        // then we need to:
        // 1. set the same percentage width constraint to the wrapper element (will be done implicilty if we will not
        // modify the 'width' CSS handler stack
        // 2. set the wrapped element's width constraint to 100%, otherwise it will be narrower than expected
        if ($wc->isFraction()) {
            $box->setCSSProperty(CSS_WIDTH, new WCFraction(1));
        }
        $handler =& CSS::get_handler(CSS_MARGIN);
        $box->setCSSProperty(CSS_MARGIN, $handler->default_value());
        /** 
         * Note:  default border does  not contain  any fontsize-dependent
         * values, so we may safely use zero as a base font size
         */
        $border_handler =& CSS::get_handler(CSS_BORDER);
        $value = $border_handler->default_value();
        $value->units2pt(0);
        $box->setCSSProperty(CSS_BORDER, $value);
        $handler =& CSS::get_handler(CSS_PADDING);
        $box->setCSSProperty(CSS_PADDING, $handler->default_value());
        $handler =& CSS::get_handler(CSS_BACKGROUND);
        $box->setCSSProperty(CSS_BACKGROUND, $handler->default_value());
        // Create "clean" block box
        $wrapper =& new BlockBox();
        $wrapper->readCSS($pipeline->get_current_css_state());
        $wrapper->add_child($box);
        // Remove CSS propery values from stack
        execute_attrs_after($root, $pipeline);
        $css_state->popState();
        return $wrapper;
    } else {
        // Remove CSS propery values from stack
        execute_attrs_after($root, $pipeline);
        $css_state->popState();
        $box->set_tagname($root->tagname());
        return $box;
    }
}
Пример #2
0
function &create_pdf_pseudoelement($root, $pe_type, &$pipeline)
{
    // Store initial values to CSS stack
    //
    push_css_defaults();
    // Apply default stylesheet rules (using base element)
    global $g_css_defaults_obj;
    $g_css_defaults_obj->apply($root, $pipeline);
    // Initially generated boxes do not require block wrappers
    // Block wrappers are required in following cases:
    // - float property is specified for non-block box which cannot be directly converted to block box
    //   (a button, for example)
    // - display set to block for such box
    $need_block_wrapper = false;
    // Order is important. Items with most priority should be applied last
    // Tag attributes
    execute_attrs_before($root, $pipeline);
    // CSS stylesheet
    global $g_css_obj;
    $g_css_obj->apply($root, $pipeline);
    // values from 'style' attribute
    if ($root->has_attribute("style")) {
        parse_style_attr(null, $root, $pipeline);
    }
    // Pseudoelement-specific rules; be default, it should flow inline
    //
    $handler =& get_css_handler('display');
    $handler->css('inline', $pipeline);
    $handler =& get_css_handler('content');
    $handler->css("", $pipeline);
    $handler =& get_css_handler('float');
    $handler->css("none", $pipeline);
    $handler =& get_css_handler('position');
    $handler->css("static", $pipeline);
    $handler =& get_css_handler('margin');
    $handler->css("0", $pipeline);
    $handler =& get_css_handler('width');
    $handler->css("auto", $pipeline);
    $handler =& get_css_handler('height');
    $handler->css("auto", $pipeline);
    $g_css_obj->apply_pseudoelement($pe_type, $root, $pipeline);
    // Now, if no content found, just return
    //
    $handler =& get_css_handler('content');
    $content = $handler->get();
    if ($content === "") {
        pop_css_defaults();
        $dummy = null;
        return $dummy;
    }
    // CSS 2.1:
    // 9.7 Relationships between 'display', 'position', and 'float'
    // The three properties that affect box generation and layout —
    // 'display', 'position', and 'float' — interact as follows:
    // 1. If 'display' has the value 'none', then 'position' and 'float' do not apply.
    //    In this case, the element generates no box.
    $position_handler =& get_css_handler('position');
    $float_handler =& get_css_handler('float');
    // 2. Otherwise, if 'position' has the value 'absolute' or 'fixed', the box is absolutely positioned,
    //    the computed value of 'float' is 'none', and display is set according to the table below.
    //    The position of the box will be determined by the 'top', 'right', 'bottom' and 'left' properties and
    //    the box's containing block.
    $position = $position_handler->get();
    if ($position === POSITION_ABSOLUTE || $position === POSITION_FIXED) {
        $float_handler->replace(FLOAT_NONE);
        $need_block_wrapper |= _fix_display_position_float();
    }
    // 3. Otherwise, if 'float' has a value other than 'none', the box is floated and 'display' is set
    //    according to the table below.
    $float = $float_handler->get();
    if ($float != FLOAT_NONE) {
        $need_block_wrapper |= _fix_display_position_float();
    }
    // 4. Otherwise, if the element is the root element, 'display' is set according to the table below.
    // 5. Otherwise, the remaining 'display' property values apply as specified. (see _fix_display_position_float)
    // Note that pseudoelements may get only standard display values
    $display_handler =& get_css_handler('display');
    switch (trim($display_handler->get())) {
        case "block":
            $box =& BlockBox::create_from_text($content);
            break;
        case "inline":
            $ws_handler =& get_css_handler('white-space');
            $box =& InlineBox::create_from_text($content, $ws_handler->get());
            break;
        default:
            die("Unsupported 'display' value: " . $display_handler->get());
    }
    // Check if this box needs a block wrapper (for example, floating button)
    // Note that to keep float/position information, we clear the CSS stack only
    // AFTER the wrapper box have been created; BUT we should clear the following CSS properties
    // to avoid the fake wrapper box actually affect the layout:
    // - margin
    // - border
    // - padding
    // - background
    //
    if ($need_block_wrapper) {
        $handler =& get_css_handler('margin');
        $handler->css("0", $pipeline);
        pop_border();
        push_border(default_border());
        pop_padding();
        push_padding(default_padding());
        $handler =& get_css_handler('background');
        $handler->css('transparent', $pipeline);
        // Create "clean" block box
        $wrapper =& new BlockBox();
        $wrapper->add_child($box);
        // Remove CSS propery values from stack
        execute_attrs_after($root, $pipeline);
        pop_css_defaults();
        return $wrapper;
    } else {
        // Remove CSS propery values from stack
        execute_attrs_after($root, $pipeline);
        pop_css_defaults();
        return $box;
    }
}