Selection caches an nsRange instance for saving re-allocation cost and AddMutationObserver() and RemoveMutationObserver()'s cost when its RemoveAllRangesTemporarily() is called.
Then, the instance is detached from the Selection but still referring editing point. E.g., the only text node in TextEditor when its value is set. Therefore, it'll receive character data change notification and need to check whether the point is still valid with new text. However, the range will be always set new position later, i.e., immediately before going back to a part of Selection. Therefore, even if the point becomes invalid, nobody must not have any problems.
This patch makes Selection make the cached range not positioned, and makes nsRange ignore any mutations when it's not positioned.
Differential Revision: https://phabricator.services.mozilla.com/D2587
--HG--
extra : moz-landing-system : lando
This also changes the function to return a sequence (JS Array) instead of
an nsFontFaceList object, and converts nsFontFace/nsIDOMFontFace into a
Web IDL implemented object too.
MozReview-Commit-ID: 1iAW3DYe5kO
--HG--
rename : layout/inspector/nsFontFace.cpp => layout/inspector/InspectorFontFace.cpp
nsRange::SetStart(), nsRange::SetEnd(), nsRange::IsPointInRange() and
nsRange::ComparePoint() take a set of container node and offset in it to
specifying a DOM point. However, the caller may not have computed the offset
but may know the child node at the point. In such case, they can avoid
computing the offset with nsINode::IndexOf() if they have overloads which
take RawRangeBoundary.
Therefore, this patch implements the overloads and changes the callers in
editor.
MozReview-Commit-ID: E4DLbAgTTCI
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extra : rebase_source : 8d1632a030f1e0a0dd2b81c3996c19d427e8b0bd
Selection should have Collapse() methods which take RawRangeBoundary instead of
a set of container and offset in it. Then, if caller know only child node but
doesn't know offset in the container, neither callers, Selections nor nsRange
needs to compute offset. This makes them avoid calling expensive method,
nsINode::IndexOf().
MozReview-Commit-ID: 79IRajLe1FE
--HG--
extra : rebase_source : a8ce52ff1654974461d5ecfed98b73d9cca34133
Inserting/removing things into a doubly-linked list is much faster than doing
the same with a hashtable. Selection ranges register themselves on their common
ancestor, but all we do with that in non-debug code is iterate all the ranges
registered. A doubly-linked list works fine for that.
This adds three words to every range for the LinkedListItem members, but that
should be OK.
Inserting/removing things into a doubly-linked list is much faster than doing
the same with a hashtable. Selection ranges register themselves on their common
ancestor, but all we do with that in non-debug code is iterate all the ranges
registered. A doubly-linked list works fine for that.
This adds three words to every range for the LinkedListItem members, but that
should be OK.
This costs an extra word per range, but ranges aren't that small anyway. The
benefit is that we don't have to recompute it dynamically when we need it, which
lets us simplify how selection ranges get registered with their common ancestors.
nsIContentIterator::Init() takes nsRange but it's too expensive for some users.
So, there should be another Init() which can be specified a range in DOM tree
with 2 pairs of nsINode* and uint32_t.
MozReview-Commit-ID: 6JXic0KOM2d
--HG--
extra : rebase_source : 28ff355a2aa0dcb5d65495806ef8c67f1da642ea
Allocating and initializing nsRange is too expensive especially for temporary
use. However, ContentEventHandler uses nsRange only for representing two DOM
points. So, it should use simpler helper class, RawRange, for reducing some
unnecessary runtime cost.
Note that this still uses nsRange for initializing nsIContentIterator. This
will be fixed by the following patch.
MozReview-Commit-ID: 5TUy6yJf7HA
--HG--
extra : rebase_source : c4eb58e8f37c408c75479e6961ba9225f8bcee77
DOM Standard defines that offset of Range is unsigned long. However, nsRange uses int32_t to them.
This patch makes nsRange use uint32_t instead. However, this patch does NOT allow to set over INT32_MAX as offset values since a lot of users of nsRange cannot treat the values as over INT32_MAX because a lot of internal APIs take int32_t as offsets.
For easier to search such points, this patch adds static_cast<int32_t> to uint32_t variables when they are used for int32_t arguments.
And note that nsContentUtils::ComparePoints() behaves odd. It accepts negative offset and compares such value with valid offset simply. This patch still uses int32_t offset variables in nsRange::CompareNodeToRange() even though it may be negative value if nsINode::IndexOf() returns -1 because the caller of it depends on this behavior.
MozReview-Commit-ID: 8RbOgA86JuT
--HG--
extra : rebase_source : 46d526c6d50dfa2f104439b19b8691477b17a4af
Web standards use "Container" instead of "Parent". So, nsRange shouldn't use "Parent" for its members and methods.
MozReview-Commit-ID: Ho6N0diuWtE
--HG--
extra : rebase_source : ee4eb7068a68b118c7fe98e9e9e7fa9c9e7f13e2
Masayuki Nakano
Emilio Cobos Álvarez
Jonathan Kew
Boris Zbarsky
Peter Van der Beken
Chris Peterson
Andrea Marchesini
Cameron McCormack
Edgar Chen
Ehsan Akhgari
Nika Layzell
Michael Layzell
Olli Pettay
Catalin Badea
Sebastian Hengst
Sylvestre Ledru
Mats Palmgren