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LibWeb: Use border box to position sticky elements

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Fixes https://github.com/LadybirdBrowser/ladybird/issues/1245
This commit is contained in:
Aliaksandr Kalenik 2024-09-02 14:06:35 +02:00 committed by Andreas Kling
parent 2e06d26ddb
commit 427e6cec7b
Notes: github-actions[bot] 2024-09-02 15:15:22 +00:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/LadybirdBrowser/ladybird/commit/427e6cec7b8
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1251
5 changed files with 81 additions and 19 deletions
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29
Tests/LibWeb/Ref/reference/sticky-positioned-box-with-border-ref.html Normal file
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@ -0,0 +1,29 @@
<link rel="match" href="reference/sticky-positioned-box-with-border-ref.html" />
<style>
* {
scrollbar-width: none;
}
html,
body {
margin: 0;
}
.sticky {
position: relative;
top: 0;
left: 0;
right: 0;
background-color: cyan;
border-top: 20px solid magenta;
padding: 0.5em;
}
#scrollable {
width: 300px;
height: 200px;
overflow: auto;
position: relative;
border: 1px solid black;
}
</style>
<div id="scrollable">
<div style="height: 10000px"><div class="sticky">I'm sticky</div></div>
</div>

33
Tests/LibWeb/Ref/sticky-positioned-box-with-border.html Normal file
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@ -0,0 +1,33 @@
<link rel="match" href="reference/sticky-positioned-box-with-border-ref.html" />
<style>
* {
scrollbar-width: none;
}
html,
body {
margin: 0;
}
.sticky {
position: sticky;
top: 0;
left: 0;
right: 0;
background-color: cyan;
border-top: 20px solid magenta;
padding: 0.5em;
}
#scrollable {
width: 300px;
height: 200px;
overflow: auto;
position: relative;
border: 1px solid black;
}
</style>
<div id="scrollable">
<div style="height: 10000px"><div class="sticky">I'm sticky</div></div>
</div>
<script>
const scrollable = document.getElementById("scrollable");
scrollable.scrollTop = 5000;
</script>

4
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
View file

@ -1120,9 +1120,9 @@ RefPtr<ScrollFrame const> PaintableBox::nearest_scroll_frame() const
return nullptr;
}
CSSPixelRect PaintableBox::padding_box_rect_relative_to_nearest_scrollable_ancestor() const
CSSPixelRect PaintableBox::border_box_rect_relative_to_nearest_scrollable_ancestor() const
{
auto result = absolute_padding_box_rect();
auto result = absolute_border_box_rect();
auto const* nearest_scrollable_ancestor = this->nearest_scrollable_ancestor();
if (nearest_scrollable_ancestor) {
result.set_location(result.location() - nearest_scrollable_ancestor->absolute_rect().top_left());

2
Userland/Libraries/LibWeb/Painting/PaintableBox.h
View file

@ -212,7 +212,7 @@ public:
RefPtr<ScrollFrame const> nearest_scroll_frame() const;
CSSPixelRect padding_box_rect_relative_to_nearest_scrollable_ancestor() const;
CSSPixelRect border_box_rect_relative_to_nearest_scrollable_ancestor() const;
PaintableBox const* nearest_scrollable_ancestor() const;
struct StickyInsets {

32
Userland/Libraries/LibWeb/Painting/ViewportPaintable.cpp
View file

@ -199,18 +199,18 @@ void ViewportPaintable::refresh_scroll_state()
auto const* containing_block_of_sticky_box = sticky_box.containing_block();
if (containing_block_of_sticky_box->is_scrollable()) {
min_y_offset_relative_to_nearest_scrollable_ancestor = 0;
max_y_offset_relative_to_nearest_scrollable_ancestor = containing_block_of_sticky_box->scrollable_overflow_rect()->height() - sticky_box.absolute_padding_box_rect().height();
max_y_offset_relative_to_nearest_scrollable_ancestor = containing_block_of_sticky_box->scrollable_overflow_rect()->height() - sticky_box.absolute_border_box_rect().height();
min_x_offset_relative_to_nearest_scrollable_ancestor = 0;
max_x_offset_relative_to_nearest_scrollable_ancestor = containing_block_of_sticky_box->scrollable_overflow_rect()->width() - sticky_box.absolute_padding_box_rect().width();
max_x_offset_relative_to_nearest_scrollable_ancestor = containing_block_of_sticky_box->scrollable_overflow_rect()->width() - sticky_box.absolute_border_box_rect().width();
} else {
auto containing_block_rect_relative_to_nearest_scrollable_ancestor = containing_block_of_sticky_box->absolute_padding_box_rect().translated(-nearest_scrollable_ancestor->absolute_rect().top_left());
auto containing_block_rect_relative_to_nearest_scrollable_ancestor = containing_block_of_sticky_box->absolute_border_box_rect().translated(-nearest_scrollable_ancestor->absolute_rect().top_left());
min_y_offset_relative_to_nearest_scrollable_ancestor = containing_block_rect_relative_to_nearest_scrollable_ancestor.top();
max_y_offset_relative_to_nearest_scrollable_ancestor = containing_block_rect_relative_to_nearest_scrollable_ancestor.bottom() - sticky_box.absolute_padding_box_rect().height();
max_y_offset_relative_to_nearest_scrollable_ancestor = containing_block_rect_relative_to_nearest_scrollable_ancestor.bottom() - sticky_box.absolute_border_box_rect().height();
min_x_offset_relative_to_nearest_scrollable_ancestor = containing_block_rect_relative_to_nearest_scrollable_ancestor.left();
max_x_offset_relative_to_nearest_scrollable_ancestor = containing_block_rect_relative_to_nearest_scrollable_ancestor.right() - sticky_box.absolute_padding_box_rect().width();
max_x_offset_relative_to_nearest_scrollable_ancestor = containing_block_rect_relative_to_nearest_scrollable_ancestor.right() - sticky_box.absolute_border_box_rect().width();
}
auto padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor = sticky_box.padding_box_rect_relative_to_nearest_scrollable_ancestor();
auto border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor = sticky_box.border_box_rect_relative_to_nearest_scrollable_ancestor();
// By default, the sticky box is shifted by the scroll offset of the nearest scrollable ancestor.
CSSPixelPoint sticky_offset = -nearest_scrollable_ancestor->scroll_offset();
@ -218,37 +218,37 @@ void ViewportPaintable::refresh_scroll_state()
if (sticky_insets.top.has_value()) {
auto top_inset = sticky_insets.top.value();
auto stick_to_top_scroll_offset_threshold = padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.top() - top_inset;
auto stick_to_top_scroll_offset_threshold = border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.top() - top_inset;
if (scrollport_rect.top() > stick_to_top_scroll_offset_threshold) {
sticky_offset.translate_by({ 0, -padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.top() });
sticky_offset.translate_by({ 0, -border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.top() });
sticky_offset.translate_by({ 0, min(scrollport_rect.top() + top_inset, max_y_offset_relative_to_nearest_scrollable_ancestor) });
}
}
if (sticky_insets.left.has_value()) {
auto left_inset = sticky_insets.left.value();
auto stick_to_left_scroll_offset_threshold = padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.left() - left_inset;
auto stick_to_left_scroll_offset_threshold = border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.left() - left_inset;
if (scrollport_rect.left() > stick_to_left_scroll_offset_threshold) {
sticky_offset.translate_by({ -padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.left(), 0 });
sticky_offset.translate_by({ -border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.left(), 0 });
sticky_offset.translate_by({ min(scrollport_rect.left() + left_inset, max_x_offset_relative_to_nearest_scrollable_ancestor), 0 });
}
}
if (sticky_insets.bottom.has_value()) {
auto bottom_inset = sticky_insets.bottom.value();
auto stick_to_bottom_scroll_offset_threshold = padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.bottom() + bottom_inset;
auto stick_to_bottom_scroll_offset_threshold = border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.bottom() + bottom_inset;
if (scrollport_rect.bottom() < stick_to_bottom_scroll_offset_threshold) {
sticky_offset.translate_by({ 0, -padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.top() });
sticky_offset.translate_by({ 0, max(scrollport_rect.bottom() - sticky_box.absolute_padding_box_rect().height() - bottom_inset, min_y_offset_relative_to_nearest_scrollable_ancestor) });
sticky_offset.translate_by({ 0, -border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.top() });
sticky_offset.translate_by({ 0, max(scrollport_rect.bottom() - sticky_box.absolute_border_box_rect().height() - bottom_inset, min_y_offset_relative_to_nearest_scrollable_ancestor) });
}
}
if (sticky_insets.right.has_value()) {
auto right_inset = sticky_insets.right.value();
auto stick_to_right_scroll_offset_threshold = padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.right() + right_inset;
auto stick_to_right_scroll_offset_threshold = border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.right() + right_inset;
if (scrollport_rect.right() < stick_to_right_scroll_offset_threshold) {
sticky_offset.translate_by({ -padding_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.left(), 0 });
sticky_offset.translate_by({ max(scrollport_rect.right() - sticky_box.absolute_padding_box_rect().width() - right_inset, min_x_offset_relative_to_nearest_scrollable_ancestor), 0 });
sticky_offset.translate_by({ -border_rect_of_sticky_box_relative_to_nearest_scrollable_ancestor.left(), 0 });
sticky_offset.translate_by({ max(scrollport_rect.right() - sticky_box.absolute_border_box_rect().width() - right_inset, min_x_offset_relative_to_nearest_scrollable_ancestor), 0 });
}
}