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serenity/Userland/Libraries/LibWeb/Layout/Box.cpp
Aliaksandr Kalenik 55b5c61a79 LibWeb: Move scroll offset state from layout tree to dom tree
Scroll offset state should not be reset by layout tree rebuilt.
2023-08-07 05:23:31 +02:00

125 lines
3.9 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, Sam Atkins <atkinssj@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Painter.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/HTMLHtmlElement.h>
#include <LibWeb/Layout/BlockContainer.h>
#include <LibWeb/Layout/Box.h>
#include <LibWeb/Layout/FormattingContext.h>
#include <LibWeb/Painting/PaintableBox.h>
namespace Web::Layout {
Box::Box(DOM::Document& document, DOM::Node* node, NonnullRefPtr<CSS::StyleProperties> style)
: NodeWithStyleAndBoxModelMetrics(document, node, move(style))
{
}
Box::Box(DOM::Document& document, DOM::Node* node, CSS::ComputedValues computed_values)
: NodeWithStyleAndBoxModelMetrics(document, node, move(computed_values))
{
}
Box::~Box()
{
}
// https://www.w3.org/TR/css-overflow-3/#overflow-control
static bool overflow_value_makes_box_a_scroll_container(CSS::Overflow overflow)
{
switch (overflow) {
case CSS::Overflow::Clip:
case CSS::Overflow::Visible:
return false;
case CSS::Overflow::Auto:
case CSS::Overflow::Hidden:
case CSS::Overflow::Scroll:
return true;
}
VERIFY_NOT_REACHED();
}
// https://www.w3.org/TR/css-overflow-3/#scroll-container
bool Box::is_scroll_container() const
{
// NOTE: This isn't in the spec, but we want the viewport to behave like a scroll container.
if (is_viewport())
return true;
return overflow_value_makes_box_a_scroll_container(computed_values().overflow_x())
|| overflow_value_makes_box_a_scroll_container(computed_values().overflow_y());
}
bool Box::is_scrollable() const
{
// FIXME: Support horizontal scroll as well (overflow-x)
return computed_values().overflow_y() == CSS::Overflow::Scroll;
}
CSSPixelPoint Box::scroll_offset() const
{
if (is_generated_for_before_pseudo_element())
return pseudo_element_generator()->scroll_offset(DOM::Element::ScrollOffsetFor::PseudoBefore);
if (is_generated_for_after_pseudo_element())
return pseudo_element_generator()->scroll_offset(DOM::Element::ScrollOffsetFor::PseudoAfter);
if (!is<DOM::Element>(*dom_node()))
return {};
return static_cast<DOM::Element const*>(dom_node())->scroll_offset(DOM::Element::ScrollOffsetFor::Self);
}
void Box::set_scroll_offset(CSSPixelPoint offset)
{
// FIXME: If there is horizontal and vertical scroll ignore only part of the new offset
if (offset.y() < 0 || scroll_offset() == offset)
return;
if (is_generated_for_before_pseudo_element()) {
pseudo_element_generator()->set_scroll_offset(DOM::Element::ScrollOffsetFor::PseudoBefore, offset);
} else if (is_generated_for_after_pseudo_element()) {
pseudo_element_generator()->set_scroll_offset(DOM::Element::ScrollOffsetFor::PseudoAfter, offset);
} else if (is<DOM::Element>(*dom_node())) {
static_cast<DOM::Element*>(dom_node())->set_scroll_offset(DOM::Element::ScrollOffsetFor::Self, offset);
} else {
return;
}
set_needs_display();
}
void Box::set_needs_display()
{
if (paintable_box())
browsing_context().set_needs_display(paintable_box()->absolute_rect());
}
bool Box::is_body() const
{
return dom_node() && dom_node() == document().body();
}
JS::GCPtr<Painting::Paintable> Box::create_paintable() const
{
return Painting::PaintableBox::create(*this);
}
Painting::PaintableBox const* Box::paintable_box() const
{
return static_cast<Painting::PaintableBox const*>(Node::paintable());
}
Optional<float> Box::preferred_aspect_ratio() const
{
auto computed_aspect_ratio = computed_values().aspect_ratio();
if (computed_aspect_ratio.use_natural_aspect_ratio_if_available && natural_aspect_ratio().has_value())
return natural_aspect_ratio();
return computed_aspect_ratio.preferred_ratio.map([](CSS::Ratio const& ratio) { return ratio.value(); });
}
}