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/* -*- 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
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