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Issue #1655: Update MediaQueryList to the current draft spec.

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This make MediaQueryList inherit from EventTarget and adds MediaQueryListEvent
as an interface as well as the onchange() method.
This should not affect compatibility with other code; the event object is a
MediaQueryListEvent instance, which is recognized as a MediaListQuery instance.
This commit is contained in:
Moonchild 2020-09-23 08:24:14 +00:00 • committed by roytam1
commit 78bcb176ea
7 changed files with 209 additions and 117 deletions
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26
layout/base/nsPresContext.cpp
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@ -1931,33 +1931,13 @@ nsPresContext::MediaFeatureValuesChanged(nsRestyleHint aRestyleHint,
if (!PR_CLIST_IS_EMPTY(mDocument->MediaQueryLists())) {
// We build a list of all the notifications we're going to send
// before we send any of them. (The spec says the notifications
// should be a queued task, so any removals that happen during the
// notifications shouldn't affect what gets notified.) Furthermore,
// we hold strong pointers to everything we're going to make
// notification calls to, since each notification involves calling
// arbitrary script that might otherwise destroy these objects, or,
// for that matter, |this|.
//
// Note that we intentionally send the notifications to media query
// list in the order they were created and, for each list, to the
// listeners in the order added.
nsTArray<MediaQueryList::HandleChangeData> notifyList;
// before we send any of them.
for (PRCList *l = PR_LIST_HEAD(mDocument->MediaQueryLists());
l != mDocument->MediaQueryLists(); l = PR_NEXT_LINK(l)) {
nsAutoMicroTask mt;
MediaQueryList *mql = static_cast<MediaQueryList*>(l);
mql->MediumFeaturesChanged(notifyList);
mql->MaybeNotify();
}
if (!notifyList.IsEmpty()) {
for (uint32_t i = 0, i_end = notifyList.Length(); i != i_end; ++i) {
nsAutoMicroTask mt;
MediaQueryList::HandleChangeData &d = notifyList[i];
d.callback->Call(*d.mql);
}
}
// NOTE: When |notifyList| goes out of scope, our destructor could run.
}
}