mirror of
https://github.com/fergalmoran/ladybird.git
synced 2026-01-06 16:45:03 +00:00
866608532a
This allows the calculation of the cumulative scroll offset for a scroll frame by adding its scroll offset to the parent’s scroll offset, rather than traversing the containing block chain. While it doesn't greatly simplify calculations for typical scroll frames, it serves as a preparation for supporting "position: sticky".
79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <LibWeb/Painting/ClippableAndScrollable.h>
|
|
#include <LibWeb/Painting/PaintContext.h>
|
|
|
|
namespace Web::Painting {
|
|
|
|
Optional<int> ClippableAndScrollable::own_scroll_frame_id() const
|
|
{
|
|
if (m_own_scroll_frame)
|
|
return m_own_scroll_frame->id;
|
|
return {};
|
|
}
|
|
|
|
Optional<int> ClippableAndScrollable::scroll_frame_id() const
|
|
{
|
|
if (m_enclosing_scroll_frame)
|
|
return m_enclosing_scroll_frame->id;
|
|
return {};
|
|
}
|
|
|
|
CSSPixelPoint ClippableAndScrollable::cumulative_offset_of_enclosing_scroll_frame() const
|
|
{
|
|
if (m_enclosing_scroll_frame)
|
|
return m_enclosing_scroll_frame->cumulative_offset();
|
|
return {};
|
|
}
|
|
|
|
Optional<CSSPixelRect> ClippableAndScrollable::clip_rect_for_hit_testing() const
|
|
{
|
|
if (m_enclosing_clip_frame)
|
|
return m_enclosing_clip_frame->clip_rect_for_hit_testing();
|
|
return {};
|
|
}
|
|
|
|
void ClippableAndScrollable::apply_clip(PaintContext& context) const
|
|
{
|
|
if (!m_enclosing_clip_frame)
|
|
return;
|
|
auto const& clip_rects = m_enclosing_clip_frame->clip_rects();
|
|
if (clip_rects.is_empty())
|
|
return;
|
|
|
|
auto& display_list_recorder = context.display_list_recorder();
|
|
display_list_recorder.save();
|
|
auto saved_scroll_frame_id = display_list_recorder.scroll_frame_id();
|
|
for (auto const& clip_rect : clip_rects) {
|
|
Optional<i32> clip_scroll_frame_id;
|
|
if (clip_rect.enclosing_scroll_frame)
|
|
clip_scroll_frame_id = clip_rect.enclosing_scroll_frame->id;
|
|
display_list_recorder.set_scroll_frame_id(clip_scroll_frame_id);
|
|
auto rect = context.rounded_device_rect(clip_rect.rect).to_type<int>();
|
|
auto corner_radii = clip_rect.corner_radii.as_corners(context);
|
|
if (corner_radii.has_any_radius()) {
|
|
display_list_recorder.add_rounded_rect_clip(corner_radii, rect, CornerClip::Outside);
|
|
} else {
|
|
display_list_recorder.add_clip_rect(rect);
|
|
}
|
|
}
|
|
display_list_recorder.set_scroll_frame_id(saved_scroll_frame_id);
|
|
}
|
|
|
|
void ClippableAndScrollable::restore_clip(PaintContext& context) const
|
|
{
|
|
if (!m_enclosing_clip_frame)
|
|
return;
|
|
auto const& clip_rects = m_enclosing_clip_frame->clip_rects();
|
|
if (clip_rects.is_empty())
|
|
return;
|
|
|
|
context.display_list_recorder().restore();
|
|
}
|
|
|
|
}
|