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serenity/Userland/Libraries/LibWeb/CSS/StyleProperties.cpp
Andreas Kling 21371bf6ee LibWeb: Add parsing and application of CSS "overflow" property 
We don't actually do anything with the values yet, but now they are
available for layout nodes once we are ready to implement them.
2021-02-22 15:21:42 +01:00

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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 <LibCore/DirIterator.h>
#include <LibGfx/FontDatabase.h>
#include <LibWeb/CSS/StyleProperties.h>
#include <LibWeb/FontCache.h>
#include <ctype.h>
namespace Web::CSS {
StyleProperties::StyleProperties()
{
}
StyleProperties::StyleProperties(const StyleProperties& other)
: m_property_values(other.m_property_values)
{
if (other.m_font) {
m_font = other.m_font->clone();
} else {
m_font = nullptr;
}
}
NonnullRefPtr<StyleProperties> StyleProperties::clone() const
{
return adopt(*new StyleProperties(*this));
}
void StyleProperties::set_property(CSS::PropertyID id, NonnullRefPtr<StyleValue> value)
{
m_property_values.set((unsigned)id, move(value));
}
void StyleProperties::set_property(CSS::PropertyID id, const StringView& value)
{
m_property_values.set((unsigned)id, StringStyleValue::create(value));
}
Optional<NonnullRefPtr<StyleValue>> StyleProperties::property(CSS::PropertyID id) const
{
auto it = m_property_values.find((unsigned)id);
if (it == m_property_values.end())
return {};
return it->value;
}
Length StyleProperties::length_or_fallback(CSS::PropertyID id, const Length& fallback) const
{
auto value = property(id);
if (!value.has_value())
return fallback;
return value.value()->to_length();
}
LengthBox StyleProperties::length_box(CSS::PropertyID left_id, CSS::PropertyID top_id, CSS::PropertyID right_id, CSS::PropertyID bottom_id, const CSS::Length& default_value) const
{
LengthBox box;
box.left = length_or_fallback(left_id, default_value);
box.top = length_or_fallback(top_id, default_value);
box.right = length_or_fallback(right_id, default_value);
box.bottom = length_or_fallback(bottom_id, default_value);
return box;
}
String StyleProperties::string_or_fallback(CSS::PropertyID id, const StringView& fallback) const
{
auto value = property(id);
if (!value.has_value())
return fallback;
return value.value()->to_string();
}
Color StyleProperties::color_or_fallback(CSS::PropertyID id, const DOM::Document& document, Color fallback) const
{
auto value = property(id);
if (!value.has_value())
return fallback;
return value.value()->to_color(document);
}
void StyleProperties::load_font() const
{
auto family_value = string_or_fallback(CSS::PropertyID::FontFamily, "Katica");
auto font_size = property(CSS::PropertyID::FontSize).value_or(IdentifierStyleValue::create(CSS::ValueID::Medium));
auto font_weight = property(CSS::PropertyID::FontWeight).value_or(IdentifierStyleValue::create(CSS::ValueID::Normal));
auto family_parts = family_value.split(',');
auto family = family_parts[0];
if (family.is_one_of("monospace", "ui-monospace"))
family = "Csilla";
else if (family.is_one_of("serif", "sans-serif", "cursive", "fantasy", "ui-serif", "ui-sans-serif", "ui-rounded"))
family = "Katica";
int weight = 400;
if (font_weight->is_identifier()) {
switch (static_cast<const IdentifierStyleValue&>(*font_weight).id()) {
case CSS::ValueID::Normal:
weight = 400;
break;
case CSS::ValueID::Bold:
weight = 700;
break;
case CSS::ValueID::Lighter:
// FIXME: This should be relative to the parent.
weight = 400;
break;
case CSS::ValueID::Bolder:
// FIXME: This should be relative to the parent.
weight = 700;
break;
default:
break;
}
} else if (font_weight->is_length()) {
// FIXME: This isn't really a length, it's a numeric value..
int font_weight_integer = font_weight->to_length().raw_value();
if (font_weight_integer <= 400)
weight = 400;
if (font_weight_integer <= 700)
weight = 700;
weight = 900;
}
int size = 10;
if (font_size->is_identifier()) {
switch (static_cast<const IdentifierStyleValue&>(*font_size).id()) {
case CSS::ValueID::XxSmall:
case CSS::ValueID::XSmall:
case CSS::ValueID::Small:
case CSS::ValueID::Medium:
// FIXME: Should be based on "user's default font size"
size = 10;
break;
case CSS::ValueID::Large:
case CSS::ValueID::XLarge:
case CSS::ValueID::XxLarge:
case CSS::ValueID::XxxLarge:
// FIXME: Should be based on "user's default font size"
size = 12;
break;
case CSS::ValueID::Smaller:
// FIXME: This should be relative to the parent.
size = 10;
break;
case CSS::ValueID::Larger:
// FIXME: This should be relative to the parent.
size = 12;
break;
default:
break;
}
} else if (font_size->is_length()) {
// FIXME: This isn't really a length, it's a numeric value..
int font_size_integer = font_size->to_length().raw_value();
size = font_size_integer;
}
FontSelector font_selector { family, size, weight };
auto found_font = FontCache::the().get(font_selector);
if (found_font) {
m_font = found_font;
return;
}
Gfx::FontDatabase::the().for_each_font([&](auto& font) {
if (font.family() == family && font.weight() == weight && font.presentation_size() == size)
found_font = font;
});
if (!found_font) {
dbgln("Font not found: '{}' {} {}", family, size, weight);
found_font = Gfx::FontDatabase::default_font();
}
m_font = found_font;
FontCache::the().set(font_selector, *m_font);
}
float StyleProperties::line_height(const Layout::Node& layout_node) const
{
auto line_height_length = length_or_fallback(CSS::PropertyID::LineHeight, Length::make_auto());
if (line_height_length.is_absolute())
return (float)line_height_length.to_px(layout_node);
return (float)font().glyph_height() * 1.4f;
}
Optional<int> StyleProperties::z_index() const
{
auto value = property(CSS::PropertyID::ZIndex);
if (!value.has_value())
return {};
return static_cast<int>(value.value()->to_length().raw_value());
}
Optional<CSS::FlexDirection> StyleProperties::flex_direction() const
{
auto value = property(CSS::PropertyID::FlexDirection);
if (!value.has_value())
return {};
switch (value.value()->to_identifier()) {
case CSS::ValueID::Row:
return CSS::FlexDirection::Row;
case CSS::ValueID::RowReverse:
return CSS::FlexDirection::RowReverse;
case CSS::ValueID::Column:
return CSS::FlexDirection::Column;
case CSS::ValueID::ColumnReverse:
return CSS::FlexDirection::ColumnReverse;
default:
return {};
}
}
Optional<CSS::Position> StyleProperties::position() const
{
auto value = property(CSS::PropertyID::Position);
if (!value.has_value() || !value.value()->is_identifier())
return {};
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::Static:
return CSS::Position::Static;
case CSS::ValueID::Relative:
return CSS::Position::Relative;
case CSS::ValueID::Absolute:
return CSS::Position::Absolute;
case CSS::ValueID::Fixed:
return CSS::Position::Fixed;
case CSS::ValueID::Sticky:
return CSS::Position::Sticky;
default:
return {};
}
}
bool StyleProperties::operator==(const StyleProperties& other) const
{
if (m_property_values.size() != other.m_property_values.size())
return false;
for (auto& it : m_property_values) {
auto jt = other.m_property_values.find(it.key);
if (jt == other.m_property_values.end())
return false;
auto& my_value = *it.value;
auto& other_value = *jt->value;
if (my_value.type() != other_value.type())
return false;
if (my_value != other_value)
return false;
}
return true;
}
Optional<CSS::TextAlign> StyleProperties::text_align() const
{
auto value = property(CSS::PropertyID::TextAlign);
if (!value.has_value() || !value.value()->is_identifier())
return {};
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::Left:
return CSS::TextAlign::Left;
case CSS::ValueID::Center:
return CSS::TextAlign::Center;
case CSS::ValueID::Right:
return CSS::TextAlign::Right;
case CSS::ValueID::Justify:
return CSS::TextAlign::Justify;
case CSS::ValueID::LibwebCenter:
return CSS::TextAlign::LibwebCenter;
default:
return {};
}
}
Optional<CSS::WhiteSpace> StyleProperties::white_space() const
{
auto value = property(CSS::PropertyID::WhiteSpace);
if (!value.has_value() || !value.value()->is_identifier())
return {};
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::Normal:
return CSS::WhiteSpace::Normal;
case CSS::ValueID::Nowrap:
return CSS::WhiteSpace::Nowrap;
case CSS::ValueID::Pre:
return CSS::WhiteSpace::Pre;
case CSS::ValueID::PreLine:
return CSS::WhiteSpace::PreLine;
case CSS::ValueID::PreWrap:
return CSS::WhiteSpace::PreWrap;
default:
return {};
}
}
Optional<CSS::LineStyle> StyleProperties::line_style(CSS::PropertyID property_id) const
{
auto value = property(property_id);
if (!value.has_value() || !value.value()->is_identifier())
return {};
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::None:
return CSS::LineStyle::None;
case CSS::ValueID::Hidden:
return CSS::LineStyle::Hidden;
case CSS::ValueID::Dotted:
return CSS::LineStyle::Dotted;
case CSS::ValueID::Dashed:
return CSS::LineStyle::Dashed;
case CSS::ValueID::Solid:
return CSS::LineStyle::Solid;
case CSS::ValueID::Double:
return CSS::LineStyle::Double;
case CSS::ValueID::Groove:
return CSS::LineStyle::Groove;
case CSS::ValueID::Ridge:
return CSS::LineStyle::Ridge;
case CSS::ValueID::Inset:
return CSS::LineStyle::Inset;
case CSS::ValueID::Outset:
return CSS::LineStyle::Outset;
default:
return {};
}
}
Optional<CSS::Float> StyleProperties::float_() const
{
auto value = property(CSS::PropertyID::Float);
if (!value.has_value() || !value.value()->is_identifier())
return {};
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::None:
return CSS::Float::None;
case CSS::ValueID::Left:
return CSS::Float::Left;
case CSS::ValueID::Right:
return CSS::Float::Right;
default:
return {};
}
}
Optional<CSS::Clear> StyleProperties::clear() const
{
auto value = property(CSS::PropertyID::Clear);
if (!value.has_value() || !value.value()->is_identifier())
return {};
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::None:
return CSS::Clear::None;
case CSS::ValueID::Left:
return CSS::Clear::Left;
case CSS::ValueID::Right:
return CSS::Clear::Right;
case CSS::ValueID::Both:
return CSS::Clear::Both;
default:
return {};
}
}
CSS::Display StyleProperties::display() const
{
auto value = property(CSS::PropertyID::Display);
if (!value.has_value() || !value.value()->is_identifier())
return CSS::Display::Inline;
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::None:
return CSS::Display::None;
case CSS::ValueID::Block:
return CSS::Display::Block;
case CSS::ValueID::Inline:
return CSS::Display::Inline;
case CSS::ValueID::InlineBlock:
return CSS::Display::InlineBlock;
case CSS::ValueID::ListItem:
return CSS::Display::ListItem;
case CSS::ValueID::Table:
return CSS::Display::Table;
case CSS::ValueID::TableRow:
return CSS::Display::TableRow;
case CSS::ValueID::TableCell:
return CSS::Display::TableCell;
case CSS::ValueID::TableColumn:
return CSS::Display::TableColumn;
case CSS::ValueID::TableColumnGroup:
return CSS::Display::TableColumnGroup;
case CSS::ValueID::TableCaption:
return CSS::Display::TableCaption;
case CSS::ValueID::TableRowGroup:
return CSS::Display::TableRowGroup;
case CSS::ValueID::TableHeaderGroup:
return CSS::Display::TableHeaderGroup;
case CSS::ValueID::TableFooterGroup:
return CSS::Display::TableFooterGroup;
case CSS::ValueID::Flex:
return CSS::Display::Flex;
default:
return CSS::Display::Block;
}
}
Optional<CSS::TextDecorationLine> StyleProperties::text_decoration_line() const
{
auto value = property(CSS::PropertyID::TextDecorationLine);
if (!value.has_value() || !value.value()->is_identifier())
return {};
switch (static_cast<const IdentifierStyleValue&>(*value.value()).id()) {
case CSS::ValueID::None:
return CSS::TextDecorationLine::None;
case CSS::ValueID::Underline:
return CSS::TextDecorationLine::Underline;
case CSS::ValueID::Overline:
return CSS::TextDecorationLine::Overline;
case CSS::ValueID::LineThrough:
return CSS::TextDecorationLine::LineThrough;
case CSS::ValueID::Blink:
return CSS::TextDecorationLine::Blink;
default:
return {};
}
}
Optional<CSS::TextTransform> StyleProperties::text_transform() const
{
auto value = property(CSS::PropertyID::TextTransform);
if (!value.has_value())
return {};
switch (value.value()->to_identifier()) {
case CSS::ValueID::None:
return CSS::TextTransform::None;
case CSS::ValueID::Lowercase:
return CSS::TextTransform::Lowercase;
case CSS::ValueID::Uppercase:
return CSS::TextTransform::Uppercase;
case CSS::ValueID::Capitalize:
return CSS::TextTransform::Capitalize;
case CSS::ValueID::FullWidth:
return CSS::TextTransform::FullWidth;
case CSS::ValueID::FullSizeKana:
return CSS::TextTransform::FullSizeKana;
default:
return {};
}
}
Optional<CSS::ListStyleType> StyleProperties::list_style_type() const
{
auto value = property(CSS::PropertyID::ListStyleType);
if (!value.has_value())
return {};
switch (value.value()->to_identifier()) {
case CSS::ValueID::None:
return CSS::ListStyleType::None;
case CSS::ValueID::Disc:
return CSS::ListStyleType::Disc;
case CSS::ValueID::Circle:
return CSS::ListStyleType::Circle;
case CSS::ValueID::Square:
return CSS::ListStyleType::Square;
case CSS::ValueID::Decimal:
return CSS::ListStyleType::Decimal;
default:
return {};
}
}
Optional<CSS::Overflow> StyleProperties::overflow_x() const
{
return overflow(CSS::PropertyID::OverflowX);
}
Optional<CSS::Overflow> StyleProperties::overflow_y() const
{
return overflow(CSS::PropertyID::OverflowY);
}
Optional<CSS::Overflow> StyleProperties::overflow(CSS::PropertyID property_id) const
{
auto value = property(property_id);
if (!value.has_value())
return {};
switch (value.value()->to_identifier()) {
case CSS::ValueID::Auto:
return CSS::Overflow::Auto;
case CSS::ValueID::Visible:
return CSS::Overflow::Visible;
case CSS::ValueID::Hidden:
return CSS::Overflow::Hidden;
case CSS::ValueID::Clip:
return CSS::Overflow::Clip;
case CSS::ValueID::Scroll:
return CSS::Overflow::Scroll;
default:
return {};
}
}
}
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