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LibWeb: Remove is<BlockContainer> check for fragments in hit testing

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This change introduces a method for direct access to the paintable of
a PaintableFragment. This method is intended to replace the usage of
the layout node pointer. Currently, we are only eliminating the use
of `layout_node()` in hit testing.

Additionally, we no longer check if a fragment's layout node is a
`BlockContainer` before recursing into its children during hit testing.
This check was likely relevant when all fragments were owned by
`PaintableWithLines`, but now it should be safe to remove this check.
This commit is contained in:
Aliaksandr Kalenik 2024-01-25 15:29:12 +01:00 committed by Andreas Kling
parent 09124fc3a5
commit 270bbf43ab
3 changed files with 13 additions and 12 deletions
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8
Userland/Libraries/LibWeb/Painting/InlinePaintable.cpp
View file

@ -163,13 +163,13 @@ void InlinePaintable::for_each_fragment(Callback callback) const
Optional<HitTestResult> InlinePaintable::hit_test(CSSPixelPoint position, HitTestType type) const
{
for (auto& fragment : m_fragments) {
if (is<Layout::Box>(fragment.layout_node()) && static_cast<Layout::Box const&>(fragment.layout_node()).paintable_box()->stacking_context())
if (fragment.paintable().stacking_context())
continue;
auto fragment_absolute_rect = fragment.absolute_rect();
if (fragment_absolute_rect.contains(position)) {
if (is<Layout::BlockContainer>(fragment.layout_node()) && fragment.layout_node().paintable())
return fragment.layout_node().paintable()->hit_test(position, type);
return HitTestResult { const_cast<Paintable&>(const_cast<Paintable&>(*fragment.layout_node().paintable())),
if (auto result = fragment.paintable().hit_test(position, type); result.has_value())
return result;
return HitTestResult { const_cast<Paintable&>(fragment.paintable()),
fragment.text_index_at(position.x()) };
}
}

16
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
View file

@ -752,17 +752,17 @@ Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, Hit
Optional<HitTestResult> last_good_candidate;
for (auto const& fragment : fragments()) {
if (is<Layout::Box>(fragment.layout_node()) && static_cast<Layout::Box const&>(fragment.layout_node()).paintable_box()->stacking_context())
if (fragment.paintable().stacking_context())
continue;
if (!fragment.layout_node().containing_block()) {
if (!fragment.paintable().containing_block()) {
dbgln("FIXME: PaintableWithLines::hit_test(): Missing containing block on {}", fragment.layout_node().debug_description());
continue;
}
auto fragment_absolute_rect = fragment.absolute_rect();
if (fragment_absolute_rect.contains(position)) {
if (is<Layout::BlockContainer>(fragment.layout_node()) && fragment.layout_node().paintable())
return fragment.layout_node().paintable()->hit_test(position, type);
return HitTestResult { const_cast<Paintable&>(const_cast<Paintable&>(*fragment.layout_node().paintable())), fragment.text_index_at(position.x()) };
if (auto result = fragment.paintable().hit_test(position, type); result.has_value())
return result;
return HitTestResult { const_cast<Paintable&>(fragment.paintable()), fragment.text_index_at(position.x()) };
}
// If we reached this point, the position is not within the fragment. However, the fragment start or end might be the place to place the cursor.
@ -771,14 +771,14 @@ Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, Hit
// We arbitrarily choose to consider the end of the line above and ignore the beginning of the line below.
// If we knew the direction of selection, we could make a better choice.
if (fragment_absolute_rect.bottom() - 1 <= position.y()) { // fully below the fragment
last_good_candidate = HitTestResult { const_cast<Paintable&>(*fragment.layout_node().paintable()), fragment.start() + fragment.length() };
last_good_candidate = HitTestResult { const_cast<Paintable&>(fragment.paintable()), fragment.start() + fragment.length() };
} else if (fragment_absolute_rect.top() <= position.y()) { // vertically within the fragment
if (position.x() < fragment_absolute_rect.left()) { // left of the fragment
if (!last_good_candidate.has_value()) { // first fragment of the line
last_good_candidate = HitTestResult { const_cast<Paintable&>(*fragment.layout_node().paintable()), fragment.start() };
last_good_candidate = HitTestResult { const_cast<Paintable&>(fragment.paintable()), fragment.start() };
}
} else { // right of the fragment
last_good_candidate = HitTestResult { const_cast<Paintable&>(*fragment.layout_node().paintable()), fragment.start() + fragment.length() };
last_good_candidate = HitTestResult { const_cast<Paintable&>(fragment.paintable()), fragment.start() + fragment.length() };
}
}
}

1
Userland/Libraries/LibWeb/Painting/PaintableFragment.h
View file

@ -20,6 +20,7 @@ public:
explicit PaintableFragment(Layout::LineBoxFragment const&);
Layout::Node const& layout_node() const { return m_layout_node; }
Paintable const& paintable() const { return *m_layout_node->paintable(); }
int start() const { return m_start; }
int length() const { return m_length; }