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LibWeb+WebContent: Move scrollbar painting into WebContent

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The main intention of this change is to have a consistent look and
behavior across all scrollbars, including elements with
`overflow: scroll` and `overflow: auto`, iframes, and a page.

Before:
- Page's scrollbar is painted by Browser (Qt/AppKit) using the
  corresponding UI framework style,
- Both WebContent and Browser know the scroll position offset.
- WebContent uses did_request_scroll_to() IPC call to send updates.
- Browser uses set_viewport_rect() to send updates.

After:
- Page's scrollbar is painted on WebContent side using the same style as
  currently used for elements with `overflow: scroll` and
  `overflow: auto`. A nice side effects: scrollbars are now painted for
  iframes, and page's scrollbar respects scrollbar-width CSS property.
- Only WebContent knows scroll position offset.
- did_request_scroll_to() is no longer used.
- set_viewport_rect() is changed to set_viewport_size().
This commit is contained in:
Aliaksandr Kalenik 2024-06-03 17:53:55 +03:00 • committed by Andreas Kling
commit 5285e22f2a
Notes: sideshowbarker 2024-07-17 01:28:15 +09:00
30 changed files with 147 additions and 186 deletions
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2
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -890,7 +890,7 @@ JS::NonnullGCPtr<Geometry::DOMRectList> Element::get_client_rects() const
if (auto const* paintable_box = this->paintable_box()) {
transform = Gfx::extract_2d_affine_transform(paintable_box->transform());
for (auto const* containing_block = paintable->containing_block(); containing_block; containing_block = containing_block->containing_block()) {
for (auto const* containing_block = paintable->containing_block(); !containing_block->is_viewport(); containing_block = containing_block->containing_block()) {
transform = Gfx::extract_2d_affine_transform(containing_block->transform()).multiply(transform);
scroll_offset.translate_by(containing_block->scroll_offset());
}