mirror of
https://github.com/RGBCube/serenity
synced 2025-10-31 19:22:45 +00:00
d65bebd8cf
Instead of invoking the CSS parser every time we compute the style for an element that has a "style" attribute, we now cache the result of parsing the inline style whenever the "style" attribute is set. This is a nice boost to relayout performance since we no longer hit the CSS parser at all.
306 lines
10 KiB
C++
306 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/StringBuilder.h>
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#include <LibWeb/CSS/Length.h>
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#include <LibWeb/CSS/Parser/CSSParser.h>
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#include <LibWeb/CSS/PropertyID.h>
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#include <LibWeb/CSS/StyleResolver.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/DocumentFragment.h>
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/DOM/Text.h>
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#include <LibWeb/Dump.h>
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#include <LibWeb/HTML/Parser/HTMLDocumentParser.h>
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#include <LibWeb/Layout/BlockBox.h>
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#include <LibWeb/Layout/InlineNode.h>
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#include <LibWeb/Layout/ListItemBox.h>
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#include <LibWeb/Layout/TableBox.h>
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#include <LibWeb/Layout/TableCellBox.h>
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#include <LibWeb/Layout/TableRowBox.h>
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#include <LibWeb/Layout/TableRowGroupBox.h>
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#include <LibWeb/Layout/TreeBuilder.h>
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namespace Web::DOM {
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Element::Element(Document& document, const QualifiedName& qualified_name)
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: ParentNode(document, NodeType::ELEMENT_NODE)
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, m_qualified_name(qualified_name)
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{
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}
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Element::~Element()
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{
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}
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Attribute* Element::find_attribute(const FlyString& name)
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{
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for (auto& attribute : m_attributes) {
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if (attribute.name() == name)
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return &attribute;
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}
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return nullptr;
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}
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const Attribute* Element::find_attribute(const FlyString& name) const
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{
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for (auto& attribute : m_attributes) {
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if (attribute.name() == name)
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return &attribute;
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}
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return nullptr;
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}
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String Element::attribute(const FlyString& name) const
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{
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if (auto* attribute = find_attribute(name))
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return attribute->value();
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return {};
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}
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void Element::set_attribute(const FlyString& name, const String& value)
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{
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if (auto* attribute = find_attribute(name))
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attribute->set_value(value);
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else
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m_attributes.empend(name, value);
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parse_attribute(name, value);
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}
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void Element::remove_attribute(const FlyString& name)
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{
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m_attributes.remove_first_matching([&](auto& attribute) { return attribute.name() == name; });
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}
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void Element::set_attributes(Vector<Attribute>&& attributes)
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{
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m_attributes = move(attributes);
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for (auto& attribute : m_attributes)
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parse_attribute(attribute.name(), attribute.value());
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}
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bool Element::has_class(const FlyString& class_name) const
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{
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for (auto& class_ : m_classes) {
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if (class_ == class_name)
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return true;
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}
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return false;
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}
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RefPtr<Layout::Node> Element::create_layout_node(const CSS::StyleProperties* parent_style)
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{
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auto style = document().style_resolver().resolve_style(*this, parent_style);
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const_cast<Element&>(*this).m_resolved_style = style;
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auto display = style->display();
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if (display == CSS::Display::None)
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return nullptr;
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if (local_name() == "noscript" && document().is_scripting_enabled())
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return nullptr;
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if (display == CSS::Display::Block)
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return adopt(*new Layout::BlockBox(document(), this, move(style)));
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if (display == CSS::Display::Inline) {
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if (style->float_().value_or(CSS::Float::None) != CSS::Float::None)
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return adopt(*new Layout::BlockBox(document(), this, move(style)));
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return adopt(*new Layout::InlineNode(document(), *this, move(style)));
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}
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if (display == CSS::Display::ListItem)
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return adopt(*new Layout::ListItemBox(document(), *this, move(style)));
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if (display == CSS::Display::Table)
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return adopt(*new Layout::TableBox(document(), *this, move(style)));
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if (display == CSS::Display::TableRow)
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return adopt(*new Layout::TableRowBox(document(), *this, move(style)));
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if (display == CSS::Display::TableCell)
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return adopt(*new Layout::TableCellBox(document(), *this, move(style)));
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if (display == CSS::Display::TableRowGroup || display == CSS::Display::TableHeaderGroup || display == CSS::Display::TableFooterGroup)
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return adopt(*new Layout::TableRowGroupBox(document(), *this, move(style)));
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if (display == CSS::Display::InlineBlock) {
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auto inline_block = adopt(*new Layout::BlockBox(document(), this, move(style)));
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inline_block->set_inline(true);
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return inline_block;
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}
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ASSERT_NOT_REACHED();
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}
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void Element::parse_attribute(const FlyString& name, const String& value)
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{
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if (name == HTML::AttributeNames::class_) {
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auto new_classes = value.split_view(' ');
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m_classes.clear();
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m_classes.ensure_capacity(new_classes.size());
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for (auto& new_class : new_classes) {
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m_classes.unchecked_append(new_class);
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}
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} else if (name == HTML::AttributeNames::style) {
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m_inline_style = parse_css_declaration(CSS::ParsingContext(document()), value);
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}
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}
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enum class StyleDifference {
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None,
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NeedsRepaint,
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NeedsRelayout,
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};
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static StyleDifference compute_style_difference(const CSS::StyleProperties& old_style, const CSS::StyleProperties& new_style, const Document& document)
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{
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if (old_style == new_style)
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return StyleDifference::None;
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bool needs_repaint = false;
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bool needs_relayout = false;
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if (new_style.display() != old_style.display())
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needs_relayout = true;
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if (new_style.color_or_fallback(CSS::PropertyID::Color, document, Color::Black) != old_style.color_or_fallback(CSS::PropertyID::Color, document, Color::Black))
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needs_repaint = true;
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else if (new_style.color_or_fallback(CSS::PropertyID::BackgroundColor, document, Color::Black) != old_style.color_or_fallback(CSS::PropertyID::BackgroundColor, document, Color::Black))
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needs_repaint = true;
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if (needs_relayout)
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return StyleDifference::NeedsRelayout;
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if (needs_repaint)
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return StyleDifference::NeedsRepaint;
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return StyleDifference::None;
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}
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void Element::recompute_style()
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{
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set_needs_style_update(false);
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ASSERT(parent());
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auto* parent_layout_node = parent()->layout_node();
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if (!parent_layout_node)
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return;
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ASSERT(parent_layout_node);
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auto style = document().style_resolver().resolve_style(*this, &parent_layout_node->specified_style());
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m_resolved_style = style;
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if (!layout_node()) {
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if (style->display() == CSS::Display::None)
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return;
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// We need a new layout tree here!
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Layout::TreeBuilder tree_builder;
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tree_builder.build(*this);
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return;
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}
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// Don't bother with style on widgets. NATIVE LOOK & FEEL BABY!
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if (layout_node()->is_widget())
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return;
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auto diff = compute_style_difference(layout_node()->specified_style(), *style, document());
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if (diff == StyleDifference::None)
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return;
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layout_node()->set_specified_style(*style);
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if (diff == StyleDifference::NeedsRelayout) {
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document().force_layout();
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return;
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}
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if (diff == StyleDifference::NeedsRepaint) {
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layout_node()->set_needs_display();
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}
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}
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NonnullRefPtr<CSS::StyleProperties> Element::computed_style()
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{
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auto properties = m_resolved_style->clone();
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if (layout_node() && layout_node()->has_style()) {
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CSS::PropertyID box_model_metrics[] = {
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CSS::PropertyID::MarginTop,
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CSS::PropertyID::MarginBottom,
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CSS::PropertyID::MarginLeft,
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CSS::PropertyID::MarginRight,
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CSS::PropertyID::PaddingTop,
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CSS::PropertyID::PaddingBottom,
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CSS::PropertyID::PaddingLeft,
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CSS::PropertyID::PaddingRight,
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CSS::PropertyID::BorderTopWidth,
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CSS::PropertyID::BorderBottomWidth,
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CSS::PropertyID::BorderLeftWidth,
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CSS::PropertyID::BorderRightWidth,
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};
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for (CSS::PropertyID id : box_model_metrics) {
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auto prop = layout_node()->specified_style().property(id);
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if (prop.has_value())
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properties->set_property(id, prop.value());
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}
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}
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return properties;
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}
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void Element::set_inner_html(StringView markup)
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{
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auto new_children = HTML::HTMLDocumentParser::parse_html_fragment(*this, markup);
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remove_all_children();
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while (!new_children.is_empty()) {
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append_child(new_children.take_first());
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}
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set_needs_style_update(true);
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document().schedule_style_update();
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document().invalidate_layout();
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}
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String Element::inner_html() const
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{
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StringBuilder builder;
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Function<void(const Node&)> recurse = [&](auto& node) {
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for (auto* child = node.first_child(); child; child = child->next_sibling()) {
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if (child->is_element()) {
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builder.append('<');
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builder.append(downcast<Element>(*child).local_name());
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builder.append('>');
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recurse(*child);
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builder.append("</");
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builder.append(downcast<Element>(*child).local_name());
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builder.append('>');
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}
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if (child->is_text()) {
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builder.append(downcast<Text>(*child).data());
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}
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}
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};
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recurse(*this);
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return builder.to_string();
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}
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bool Element::is_focused() const
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{
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return document().focused_element() == this;
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}
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}
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