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LibWeb: Treat grid item as it creates stacking context during painting

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Grid specification https://www.w3.org/TR/css-grid-2/#z-order defines
special painting order for grid items which should be the same as for
defined for inline-blocks in CSS2.
This commit is contained in:
Aliaksandr Kalenik 2023-08-20 19:42:54 +02:00 • committed by Andreas Kling
parent b4064320bd
commit 95a8dec373
7 changed files with 74 additions and 10 deletions
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8
Tests/LibWeb/Ref/grid-items-painting-order-ref.html Normal file
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@ -0,0 +1,8 @@
<!doctype html><style type="text/css">
* { outline: 1px solid black; }
body { display: grid; }
.bar {
grid-area: 1 / 1 / auto / auto;
background: orange;
}
</style><body><div class="bar">bar</div>

12
Tests/LibWeb/Ref/grid-items-painting-order.html Normal file
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@ -0,0 +1,12 @@
<!doctype html><style type="text/css">
* { outline: 1px solid black; }
body { display: grid; }
.foo {
grid-area: 1 / 1 / auto / auto;
background: pink;
}
.bar {
grid-area: 1 / 1 / auto / auto;
background: orange;
}
</style><body><div class="foo">foo</div><div class="bar">bar</div>

1
Tests/LibWeb/Ref/manifest.json
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@ -1,5 +1,6 @@
{
"img-srcset-viewport-relative-sizes.html": "img-srcset-viewport-relative-sizes-ref.html",
"grid-items-painting-order.html": "grid-items-painting-order-ref.html",
"square-flex.html": "square-ref.html",
"separate-borders-inline-table.html": "separate-borders-ref.html",
"opacity-stacking.html": "opacity-stacking-ref.html",

1
Tests/LibWeb/Text/expected/hit_testing/grid.txt Normal file
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@ -0,0 +1 @@
true

23
Tests/LibWeb/Text/input/hit_testing/grid.html Normal file
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@ -0,0 +1,23 @@
<!doctype html><style type="text/css">
* { outline: 1px solid black; }
body { display: grid; }
#foo {
grid-area: 1 / 1 / auto / auto;
background: pink;
width: 100px;
height: 100px;
}
#bar {
grid-area: 1 / 1 / auto / auto;
background: orange;
width: 100px;
height: 100px;
}
</style>
<div id="foo"></div><div id="bar"></div>
<script src="../include.js"></script>
<script>
test(() => {
println(internals.hitTest(50, 50).node === document.getElementById("bar"));
});
</script>

38
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
View file

@ -72,6 +72,20 @@ static PaintPhase to_paint_phase(StackingContext::StackingContextPaintPhase phas
}
}
void StackingContext::paint_node_as_stacking_context(Paintable const& paintable, PaintContext& context) const
{
paint_node(paintable, context, PaintPhase::Background);
paint_node(paintable, context, PaintPhase::Border);
paint_descendants(context, paintable, StackingContextPaintPhase::BackgroundAndBorders);
paint_descendants(context, paintable, StackingContextPaintPhase::Floats);
paint_descendants(context, paintable, StackingContextPaintPhase::BackgroundAndBordersForInlineLevelAndReplaced);
paint_node(paintable, context, PaintPhase::Foreground);
paint_descendants(context, paintable, StackingContextPaintPhase::Foreground);
paint_node(paintable, context, PaintPhase::Outline);
paint_node(paintable, context, PaintPhase::Overlay);
paint_descendants(context, paintable, StackingContextPaintPhase::FocusAndOverlay);
}
void StackingContext::paint_descendants(PaintContext& context, Paintable const& paintable, StackingContextPaintPhase phase) const
{
paintable.before_children_paint(context, to_paint_phase(phase));
@ -99,6 +113,19 @@ void StackingContext::paint_descendants(PaintContext& context, Paintable const&
return;
}
// NOTE: Grid specification https://www.w3.org/TR/css-grid-2/#z-order says that grid items should be treated
// the same way as CSS2 defines for inline-blocks:
// "For each one of these, treat the element as if it created a new stacking context, but any positioned
// descendants and descendants which actually create a new stacking context should be considered part of
// the parent stacking context, not this new one."
auto should_be_treated_as_stacking_context = child.layout_node().is_grid_item();
if (should_be_treated_as_stacking_context) {
// FIXME: This may not be fully correct with respect to the paint phases.
if (phase == StackingContextPaintPhase::Foreground)
paint_node_as_stacking_context(child, context);
return;
}
bool child_is_inline_or_replaced = child.is_inline() || is<Layout::ReplacedBox>(child);
switch (phase) {
case StackingContextPaintPhase::BackgroundAndBorders:
@ -214,16 +241,7 @@ void StackingContext::paint_internal(PaintContext& context) const
paint_child(context, *child);
return TraversalDecision::SkipChildrenAndContinue;
} else {
paint_node(paintable, context, PaintPhase::Background);
paint_node(paintable, context, PaintPhase::Border);
paint_descendants(context, paintable, StackingContextPaintPhase::BackgroundAndBorders);
paint_descendants(context, paintable, StackingContextPaintPhase::Floats);
paint_descendants(context, paintable, StackingContextPaintPhase::BackgroundAndBordersForInlineLevelAndReplaced);
paint_node(paintable, context, PaintPhase::Foreground);
paint_descendants(context, paintable, StackingContextPaintPhase::Foreground);
paint_node(paintable, context, PaintPhase::Outline);
paint_node(paintable, context, PaintPhase::Overlay);
paint_descendants(context, paintable, StackingContextPaintPhase::FocusAndOverlay);
paint_node_as_stacking_context(paintable, context);
}
if (parent_paintable)
parent_paintable->after_children_paint(context, PaintPhase::Foreground);

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

@ -29,6 +29,7 @@ public:
FocusAndOverlay,
};
void paint_node_as_stacking_context(Paintable const&, PaintContext&) const;
void paint_descendants(PaintContext&, Paintable const&, StackingContextPaintPhase) const;
void paint(PaintContext&) const;
Optional<HitTestResult> hit_test(CSSPixelPoint, HitTestType) const;