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LibWeb: Make hit testing respect hidden overflow

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This commit is contained in:
Igor Pissolati 2022-07-03 18:34:51 -03:00 • committed by Andreas Kling
parent 4b70ddf5a0
commit 44057c9482
2 changed files with 48 additions and 21 deletions
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43
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
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@ -288,20 +288,27 @@ Gfx::FloatPoint StackingContext::transform_origin() const
Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& position, HitTestType type) const
{
if (!m_box.is_visible())
return {};
if (m_box.computed_values().z_index().value_or(0) < 0)
return {};
auto transform_origin = this->transform_origin();
auto affine_transform = combine_transformations_2d(m_box.computed_values().transformations());
auto transformed_position = affine_transform.inverse().value_or({}).map(position - transform_origin) + transform_origin;
// FIXME: Support more overflow variations.
if (paintable().computed_values().overflow_x() == CSS::Overflow::Hidden && paintable().computed_values().overflow_y() == CSS::Overflow::Hidden) {
if (!paintable().absolute_border_box_rect().contains(transformed_position.x(), transformed_position.y()))
return {};
}
// NOTE: Hit testing basically happens in reverse painting order.
// https://www.w3.org/TR/CSS22/visuren.html#z-index
// 7. the child stacking contexts with positive stack levels (least positive first).
for (ssize_t i = m_children.size() - 1; i >= 0; --i) {
auto const& child = *m_children[i];
if (!child.m_box.is_visible())
continue;
if (child.m_box.computed_values().z_index().value_or(0) < 0)
continue;
auto result = child.hit_test(transformed_position, type);
if (result.has_value())
return result;
@ -310,12 +317,18 @@ Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& positio
Optional<HitTestResult> result;
// 6. the child stacking contexts with stack level 0 and the positioned descendants with stack level 0.
paintable().for_each_in_subtree_of_type<PaintableBox>([&](auto& paint_box) {
// FIXME: Support more overflow variations.
if (paint_box.computed_values().overflow_x() == CSS::Overflow::Hidden && paint_box.computed_values().overflow_y() == CSS::Overflow::Hidden) {
if (!paint_box.absolute_border_box_rect().contains(transformed_position.x(), transformed_position.y()))
return TraversalDecision::SkipChildrenAndContinue;
}
auto& layout_box = paint_box.layout_box();
if (layout_box.is_positioned() && !paint_box.stacking_context()) {
if (auto candidate = paint_box.hit_test(transformed_position, type); candidate.has_value())
result = move(candidate);
}
return IterationDecision::Continue;
return TraversalDecision::Continue;
});
if (result.has_value())
return result;
@ -329,12 +342,18 @@ Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& positio
// 4. the non-positioned floats.
paintable().for_each_in_subtree_of_type<PaintableBox>([&](auto const& paint_box) {
// FIXME: Support more overflow variations.
if (paint_box.computed_values().overflow_x() == CSS::Overflow::Hidden && paint_box.computed_values().overflow_y() == CSS::Overflow::Hidden) {
if (!paint_box.absolute_border_box_rect().contains(transformed_position.x(), transformed_position.y()))
return TraversalDecision::SkipChildrenAndContinue;
}
auto& layout_box = paint_box.layout_box();
if (layout_box.is_floating()) {
if (auto candidate = paint_box.hit_test(transformed_position, type); candidate.has_value())
result = move(candidate);
}
return IterationDecision::Continue;
return TraversalDecision::Continue;
});
if (result.has_value())
return result;
@ -342,12 +361,18 @@ Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& positio
// 3. the in-flow, non-inline-level, non-positioned descendants.
if (!m_box.children_are_inline()) {
paintable().for_each_in_subtree_of_type<PaintableBox>([&](auto const& paint_box) {
// FIXME: Support more overflow variations.
if (paint_box.computed_values().overflow_x() == CSS::Overflow::Hidden && paint_box.computed_values().overflow_y() == CSS::Overflow::Hidden) {
if (!paint_box.absolute_border_box_rect().contains(transformed_position.x(), transformed_position.y()))
return TraversalDecision::SkipChildrenAndContinue;
}
auto& layout_box = paint_box.layout_box();
if (!layout_box.is_absolutely_positioned() && !layout_box.is_floating()) {
if (auto candidate = paint_box.hit_test(transformed_position, type); candidate.has_value())
result = move(candidate);
}
return IterationDecision::Continue;
return TraversalDecision::Continue;
});
if (result.has_value())
return result;
@ -356,10 +381,6 @@ Optional<HitTestResult> StackingContext::hit_test(Gfx::FloatPoint const& positio
// 2. the child stacking contexts with negative stack levels (most negative first).
for (ssize_t i = m_children.size() - 1; i >= 0; --i) {
auto const& child = *m_children[i];
if (child.m_box.computed_values().z_index().value_or(0) < 0)
continue;
if (!child.m_box.is_visible())
continue;
auto result = child.hit_test(transformed_position, type);
if (result.has_value())
return result;