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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/editing/spellcheck/cold_mode_spell_check_requester.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/idle_deadline.h"
#include "third_party/blink/renderer/core/editing/editing_utilities.h"
#include "third_party/blink/renderer/core/editing/ephemeral_range.h"
#include "third_party/blink/renderer/core/editing/frame_selection.h"
#include "third_party/blink/renderer/core/editing/iterators/character_iterator.h"
#include "third_party/blink/renderer/core/editing/selection_template.h"
#include "third_party/blink/renderer/core/editing/spellcheck/spell_check_requester.h"
#include "third_party/blink/renderer/core/editing/spellcheck/spell_checker.h"
#include "third_party/blink/renderer/core/editing/visible_units.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
namespace blink {
namespace {
const int kColdModeChunkSize = 16384; // in UTF16 code units
const int kInvalidChunkIndex = -1;
} // namespace
// static
ColdModeSpellCheckRequester* ColdModeSpellCheckRequester::Create(
LocalFrame& frame) {
return new ColdModeSpellCheckRequester(frame);
}
void ColdModeSpellCheckRequester::Trace(blink::Visitor* visitor) {
visitor->Trace(frame_);
visitor->Trace(root_editable_);
visitor->Trace(last_chunk_end_);
}
ColdModeSpellCheckRequester::ColdModeSpellCheckRequester(LocalFrame& frame)
: frame_(frame),
last_chunk_index_(kInvalidChunkIndex),
needs_more_invocation_for_testing_(false) {}
bool ColdModeSpellCheckRequester::FullyChecked() const {
if (needs_more_invocation_for_testing_) {
needs_more_invocation_for_testing_ = false;
return false;
}
return !root_editable_ ||
last_chunk_end_ == Position::LastPositionInNode(*root_editable_);
}
SpellCheckRequester& ColdModeSpellCheckRequester::GetSpellCheckRequester()
const {
return GetFrame().GetSpellChecker().GetSpellCheckRequester();
}
const Element* ColdModeSpellCheckRequester::CurrentFocusedEditable() const {
const Position position =
GetFrame().Selection().GetSelectionInDOMTree().Extent();
if (position.IsNull())
return nullptr;
const ContainerNode* root = HighestEditableRoot(position);
if (!root || !root->isConnected() || !root->IsElementNode())
return nullptr;
const Element* element = ToElement(root);
if (!element->IsSpellCheckingEnabled() ||
!SpellChecker::IsSpellCheckingEnabledAt(position))
return nullptr;
return element;
}
void ColdModeSpellCheckRequester::Invoke(IdleDeadline* deadline) {
TRACE_EVENT0("blink", "ColdModeSpellCheckRequester::invoke");
// TODO(xiaochengh): Figure out if this has any performance impact.
GetFrame().GetDocument()->UpdateStyleAndLayout();
const Element* current_focused = CurrentFocusedEditable();
if (!current_focused) {
ClearProgress();
return;
}
if (root_editable_ != current_focused) {
root_editable_ = current_focused;
last_chunk_index_ = 0;
last_chunk_end_ = Position::FirstPositionInNode(*root_editable_);
}
while (!FullyChecked() && deadline->timeRemaining() > 0)
RequestCheckingForNextChunk();
}
void ColdModeSpellCheckRequester::ClearProgress() {
root_editable_ = nullptr;
last_chunk_index_ = kInvalidChunkIndex;
last_chunk_end_ = Position();
}
void ColdModeSpellCheckRequester::RequestCheckingForNextChunk() {
DCHECK(root_editable_);
const int chunk_index = last_chunk_index_;
const Position chunk_start = last_chunk_end_;
const Position chunk_end =
CalculateCharacterSubrange(
EphemeralRange(chunk_start,
Position::LastPositionInNode(*root_editable_)),
0, kColdModeChunkSize)
.EndPosition();
const EphemeralRange chunk_range(chunk_start, chunk_end);
const EphemeralRange check_range = ExpandEndToSentenceBoundary(chunk_range);
if (!GetSpellCheckRequester().RequestCheckingFor(check_range, chunk_index)) {
// Fully checked.
last_chunk_end_ = Position::LastPositionInNode(*root_editable_);
return;
}
last_chunk_index_ = chunk_index;
last_chunk_end_ = check_range.EndPosition();
}
} // namespace blink
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