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Issue #2030 - Dispatch click on common interactive ancestor if mousdown/up are not on the same element

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For example, if the mouse is dragged from one element to another while
staying inside the same button, dispatch from their common ancestor
This commit is contained in:
Martok 2022-11-27 16:35:56 +01:00 • committed by roytam1
commit b4dd106262
6 changed files with 103 additions and 56 deletions
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50
dom/base/nsContentUtils.cpp
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@ -2377,6 +2377,56 @@ nsContentUtils::GetCommonAncestor(nsINode* aNode1,
return parent;
}
// static
nsINode*
nsContentUtils::GetCommonAncestorUnderInteractiveContent(nsINode* aNode1,
nsINode* aNode2)
{
if (!aNode1 || !aNode2) {
return nullptr;
}
if (aNode1 == aNode2) {
return aNode1;
}
// Build the chain of parents
AutoTArray<nsINode*, 30> parents1;
do {
parents1.AppendElement(aNode1);
if (aNode1->IsElement() &&
aNode1->AsElement()->IsInteractiveHTMLContent(true)) {
break;
}
aNode1 = aNode1->GetFlattenedTreeParentNode();
} while (aNode1);
AutoTArray<nsINode*, 30> parents2;
do {
parents2.AppendElement(aNode2);
if (aNode2->IsElement() &&
aNode2->AsElement()->IsInteractiveHTMLContent(true)) {
break;
}
aNode2 = aNode2->GetFlattenedTreeParentNode();
} while (aNode2);
// Find where the parent chain differs
uint32_t pos1 = parents1.Length();
uint32_t pos2 = parents2.Length();
nsINode* parent = nullptr;
for (uint32_t len = std::min(pos1, pos2); len > 0; --len) {
nsINode* child1 = parents1.ElementAt(--pos1);
nsINode* child2 = parents2.ElementAt(--pos2);
if (child1 != child2) {
break;
}
parent = child1;
}
return parent;
}
/* static */
bool
nsContentUtils::PositionIsBefore(nsINode* aNode1, nsINode* aNode2)