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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <LibHTML/CSS/StyleResolver.h>
#include <LibHTML/CSS/PropertyID.h>
#include <LibHTML/CSS/Length.h>
#include <LibHTML/DOM/Document.h>
#include <LibHTML/DOM/Element.h>
#include <LibHTML/Layout/LayoutBlock.h>
#include <LibHTML/Layout/LayoutInline.h>
#include <LibHTML/Layout/LayoutListItem.h>
#include <LibHTML/Layout/LayoutTable.h>
#include <LibHTML/Layout/LayoutTableCell.h>
#include <LibHTML/Layout/LayoutTableRow.h>
#include <LibHTML/Layout/LayoutTreeBuilder.h>
namespace Web {
Element::Element(Document& document, const String& tag_name)
: ParentNode(document, NodeType::ELEMENT_NODE)
, m_tag_name(tag_name)
{
}
Element::~Element()
{
}
Attribute* Element::find_attribute(const String& name)
{
for (auto& attribute : m_attributes) {
if (attribute.name() == name)
return &attribute;
}
return nullptr;
}
const Attribute* Element::find_attribute(const String& name) const
{
for (auto& attribute : m_attributes) {
if (attribute.name() == name)
return &attribute;
}
return nullptr;
}
String Element::attribute(const String& name) const
{
if (auto* attribute = find_attribute(name))
return attribute->value();
return {};
}
void Element::set_attribute(const String& name, const String& value)
{
if (auto* attribute = find_attribute(name))
attribute->set_value(value);
else
m_attributes.empend(name, value);
parse_attribute(name, value);
}
void Element::set_attributes(Vector<Attribute>&& attributes)
{
m_attributes = move(attributes);
for (auto& attribute : m_attributes)
parse_attribute(attribute.name(), attribute.value());
}
bool Element::has_class(const StringView& class_name) const
{
auto value = attribute("class");
if (value.is_empty())
return false;
auto parts = value.split_view(' ');
for (auto& part : parts) {
if (part == class_name)
return true;
}
return false;
}
RefPtr<LayoutNode> Element::create_layout_node(const StyleProperties* parent_style) const
{
auto style = document().style_resolver().resolve_style(*this, parent_style);
const_cast<Element&>(*this).m_resolved_style = style;
auto display = style->string_or_fallback(CSS::PropertyID::Display, "inline");
if (display == "none")
return nullptr;
if (display == "block")
return adopt(*new LayoutBlock(this, move(style)));
if (display == "inline")
return adopt(*new LayoutInline(*this, move(style)));
if (display == "list-item")
return adopt(*new LayoutListItem(*this, move(style)));
if (display == "table")
return adopt(*new LayoutTable(*this, move(style)));
if (display == "table-row")
return adopt(*new LayoutTableRow(*this, move(style)));
if (display == "table-cell")
return adopt(*new LayoutTableCell(*this, move(style)));
if (display == "inline-block")
return adopt(*new LayoutBlock(this, move(style)));
ASSERT_NOT_REACHED();
}
void Element::parse_attribute(const String&, const String&)
{
}
enum class StyleDifference {
None,
NeedsRepaint,
NeedsRelayout,
};
static StyleDifference compute_style_difference(const StyleProperties& old_style, const StyleProperties& new_style, const Document& document)
{
if (old_style == new_style)
return StyleDifference::None;
bool needs_repaint = false;
bool needs_relayout = false;
if (new_style.color_or_fallback(CSS::PropertyID::Color, document, Color::Black) != old_style.color_or_fallback(CSS::PropertyID::Color, document, Color::Black))
needs_repaint = true;
else if (new_style.color_or_fallback(CSS::PropertyID::BackgroundColor, document, Color::Black) != old_style.color_or_fallback(CSS::PropertyID::BackgroundColor, document, Color::Black))
needs_repaint = true;
if (needs_relayout)
return StyleDifference::NeedsRelayout;
if (needs_repaint)
return StyleDifference::NeedsRepaint;
return StyleDifference::None;
}
void Element::recompute_style()
{
set_needs_style_update(false);
ASSERT(parent());
auto* parent_layout_node = parent()->layout_node();
if (!parent_layout_node)
return;
ASSERT(parent_layout_node);
auto style = document().style_resolver().resolve_style(*this, &parent_layout_node->style());
m_resolved_style = style;
if (!layout_node()) {
if (style->string_or_fallback(CSS::PropertyID::Display, "inline") == "none")
return;
// We need a new layout tree here!
LayoutTreeBuilder tree_builder;
tree_builder.build(*this);
return;
}
auto diff = compute_style_difference(layout_node()->style(), *style, document());
if (diff == StyleDifference::None)
return;
layout_node()->set_style(*style);
if (diff == StyleDifference::NeedsRelayout) {
ASSERT_NOT_REACHED();
}
if (diff == StyleDifference::NeedsRepaint) {
layout_node()->set_needs_display();
}
}
NonnullRefPtr<StyleProperties> Element::computed_style()
{
auto properties = m_resolved_style->clone();
if (layout_node() && layout_node()->has_style()) {
CSS::PropertyID box_model_metrics[] = {
CSS::PropertyID::MarginTop,
CSS::PropertyID::MarginBottom,
CSS::PropertyID::MarginLeft,
CSS::PropertyID::MarginRight,
CSS::PropertyID::PaddingTop,
CSS::PropertyID::PaddingBottom,
CSS::PropertyID::PaddingLeft,
CSS::PropertyID::PaddingRight,
CSS::PropertyID::BorderTopWidth,
CSS::PropertyID::BorderBottomWidth,
CSS::PropertyID::BorderLeftWidth,
CSS::PropertyID::BorderRightWidth,
};
for (CSS::PropertyID id : box_model_metrics) {
auto prop = layout_node()->style().property(id);
if (prop.has_value())
properties->set_property(id, prop.value());
}
}
return properties;
}
}
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