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Diffstat (limited to '')
| -rw-r--r-- | dom/base/SelectionChangeEventDispatcher.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/dom/base/SelectionChangeEventDispatcher.cpp b/dom/base/SelectionChangeEventDispatcher.cpp new file mode 100644 index 0000000000..f53637081d --- /dev/null +++ b/dom/base/SelectionChangeEventDispatcher.cpp @@ -0,0 +1,173 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* + * Implementation of mozilla::SelectionChangeEventDispatcher + */ + +#include "SelectionChangeEventDispatcher.h" + +#include "mozilla/AsyncEventDispatcher.h" +#include "mozilla/BasePrincipal.h" +#include "mozilla/StaticPrefs_dom.h" +#include "nsCOMPtr.h" +#include "nsContentUtils.h" +#include "mozilla/dom/Document.h" +#include "nsFrameSelection.h" +#include "nsRange.h" +#include "mozilla/dom/Selection.h" + +namespace mozilla { + +using namespace dom; + +SelectionChangeEventDispatcher::RawRangeData::RawRangeData( + const nsRange* aRange) { + if (aRange->IsPositioned()) { + mStartContainer = aRange->GetStartContainer(); + mEndContainer = aRange->GetEndContainer(); + mStartOffset = aRange->StartOffset(); + mEndOffset = aRange->EndOffset(); + } else { + mStartContainer = nullptr; + mEndContainer = nullptr; + mStartOffset = 0; + mEndOffset = 0; + } +} + +bool SelectionChangeEventDispatcher::RawRangeData::Equals( + const nsRange* aRange) { + if (!aRange->IsPositioned()) { + return !mStartContainer; + } + return mStartContainer == aRange->GetStartContainer() && + mEndContainer == aRange->GetEndContainer() && + mStartOffset == aRange->StartOffset() && + mEndOffset == aRange->EndOffset(); +} + +inline void ImplCycleCollectionTraverse( + nsCycleCollectionTraversalCallback& aCallback, + SelectionChangeEventDispatcher::RawRangeData& aField, const char* aName, + uint32_t aFlags = 0) { + ImplCycleCollectionTraverse(aCallback, aField.mStartContainer, + "mStartContainer", aFlags); + ImplCycleCollectionTraverse(aCallback, aField.mEndContainer, "mEndContainer", + aFlags); +} + +NS_IMPL_CYCLE_COLLECTION_CLASS(SelectionChangeEventDispatcher) + +NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(SelectionChangeEventDispatcher) + tmp->mOldRanges.Clear(); +NS_IMPL_CYCLE_COLLECTION_UNLINK_END + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(SelectionChangeEventDispatcher) + NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOldRanges); +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END + +NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(SelectionChangeEventDispatcher, AddRef) +NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(SelectionChangeEventDispatcher, Release) + +void SelectionChangeEventDispatcher::OnSelectionChange(Document* aDoc, + Selection* aSel, + int16_t aReason) { + Document* doc = aSel->GetParentObject(); + if (!(doc && doc->NodePrincipal()->IsSystemPrincipal()) && + !StaticPrefs::dom_select_events_enabled()) { + return; + } + + // Check if the ranges have actually changed + // Don't bother checking this if we are hiding changes. + if (mOldRanges.Length() == aSel->RangeCount() && + !aSel->IsBlockingSelectionChangeEvents()) { + bool changed = false; + + for (size_t i = 0; i < mOldRanges.Length(); i++) { + if (!mOldRanges[i].Equals(aSel->GetRangeAt(i))) { + changed = true; + break; + } + } + + if (!changed) { + return; + } + } + + // The ranges have actually changed, update the mOldRanges array + mOldRanges.ClearAndRetainStorage(); + for (size_t i = 0; i < aSel->RangeCount(); i++) { + mOldRanges.AppendElement(RawRangeData(aSel->GetRangeAt(i))); + } + + if (doc) { + nsPIDOMWindowInner* inner = doc->GetInnerWindow(); + if (inner && !inner->HasSelectionChangeEventListeners()) { + return; + } + } + + // If we are hiding changes, then don't do anything else. We do this after we + // update mOldRanges so that changes after the changes stop being hidden don't + // incorrectly trigger a change, even though they didn't change anything + if (aSel->IsBlockingSelectionChangeEvents()) { + return; + } + + // The spec currently doesn't say that we should dispatch this event on text + // controls, so for now we only support doing that under a pref, disabled by + // default. + // See https://github.com/w3c/selection-api/issues/53. + if (StaticPrefs::dom_select_events_textcontrols_enabled()) { + nsCOMPtr<nsINode> target; + + // Check if we should be firing this event to a different node than the + // document. The limiter of the nsFrameSelection will be within the native + // anonymous subtree of the node we want to fire the event on. We need to + // climb up the parent chain to escape the native anonymous subtree, and + // then fire the event. + if (const nsFrameSelection* fs = aSel->GetFrameSelection()) { + if (nsCOMPtr<nsIContent> root = fs->GetLimiter()) { + while (root && root->IsInNativeAnonymousSubtree()) { + root = root->GetParent(); + } + + target = std::move(root); + } + } + + // If we didn't get a target before, we can instead fire the event at the + // document. + if (!target) { + target = aDoc; + } + + if (target) { + RefPtr<AsyncEventDispatcher> asyncDispatcher = + new AsyncEventDispatcher(target, eSelectionChange, CanBubble::eNo); + asyncDispatcher->PostDOMEvent(); + } + } else { + if (const nsFrameSelection* fs = aSel->GetFrameSelection()) { + if (nsCOMPtr<nsIContent> root = fs->GetLimiter()) { + if (root->IsInNativeAnonymousSubtree()) { + return; + } + } + } + + if (aDoc) { + RefPtr<AsyncEventDispatcher> asyncDispatcher = + new AsyncEventDispatcher(aDoc, eSelectionChange, CanBubble::eNo); + asyncDispatcher->PostDOMEvent(); + } + } +} + +} // namespace mozilla |