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LibWeb: Pick the correct DOM node for mouse-move events

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This makes hovering over the link in the following HTML snippet work,
i.e. the tooltip is shown and the link target is shown at the bottom
of the browser window:

<html lang="en"><head><style>
.site-link{display:inline-block}
.site-link:before{content:"derp"}
.site-link::after{content:"";display:block}
</style></head><body><a class="site-link" href="#"
title="Tooltip, maybe!"></a>
This commit is contained in:
Gunnar Beutner 2022-11-07 18:22:33 +01:00 • committed by Andreas Kling
parent 3cc0d60141
commit 892186d058
1 changed files with 6 additions and 11 deletions
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17
Userland/Libraries/LibWeb/Page/EventHandler.cpp
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@ -453,9 +453,14 @@ bool EventHandler::handle_mousemove(Gfx::IntPoint const& position, unsigned butt
// FIXME: Handle other values for pointer-events.
VERIFY(pointer_events != CSS::PointerEvents::None);
// Search for the first parent of the hit target that's an element.
// "The click event type MUST be dispatched on the topmost event target indicated by the pointer." (https://www.w3.org/TR/uievents/#event-type-click)
// "The topmost event target MUST be the element highest in the rendering order which is capable of being an event target." (https://www.w3.org/TR/uievents/#topmost-event-target)
Layout::Node const* layout_node;
bool found_parent_element = parent_element_for_event_dispatch(*paintable, node, layout_node);
hovered_node_changed = node.ptr() != document.hovered_node();
document.set_hovered_node(node);
if (node) {
if (found_parent_element) {
hovered_link_element = node->enclosing_link_element();
if (hovered_link_element)
is_hovering_link = true;
@ -474,22 +479,12 @@ bool EventHandler::handle_mousemove(Gfx::IntPoint const& position, unsigned butt
hovered_node_cursor = cursor_css_to_gfx(cursor);
}
// Search for the first parent of the hit target that's an element.
// "The click event type MUST be dispatched on the topmost event target indicated by the pointer." (https://www.w3.org/TR/uievents/#event-type-click)
// "The topmost event target MUST be the element highest in the rendering order which is capable of being an event target." (https://www.w3.org/TR/uievents/#topmost-event-target)
Layout::Node const* layout_node;
if (!parent_element_for_event_dispatch(*paintable, node, layout_node)) {
// FIXME: This is pretty ugly but we need to bail out here.
goto after_node_use;
}
auto offset = compute_mouse_event_offset(position, *layout_node);
node->dispatch_event(*UIEvents::MouseEvent::create_from_platform_event(node->realm(), UIEvents::EventNames::mousemove, offset.x(), offset.y(), position.x(), position.y(), buttons));
// NOTE: Dispatching an event may have disturbed the world.
if (!paint_root() || paint_root() != node->document().paint_box())
return true;
}
after_node_use:
if (m_in_mouse_selection) {
auto hit = paint_root()->hit_test(position.to_type<float>(), Painting::HitTestType::TextCursor);
if (start_index.has_value() && hit.has_value() && hit->dom_node()) {