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// Copyright 2020 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.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_IME_CACHED_TEXT_INPUT_INFO_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_IME_CACHED_TEXT_INPUT_INFO_H_
#include "third_party/blink/renderer/core/editing/iterators/text_iterator_behavior.h"
#include "third_party/blink/renderer/core/editing/plain_text_range.h"
#include "third_party/blink/renderer/core/editing/position.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
class LayoutObject;
// |CachedTextInputInfo| holds plain text, and plain text range for
// composition and selection in |element_| until layout of |element_|
// changed. This class also provides faster version of |PlaintTextRange|.
class CORE_EXPORT CachedTextInputInfo final {
DISALLOW_NEW();
public:
CachedTextInputInfo(const CachedTextInputInfo&) = delete;
CachedTextInputInfo() = default;
CachedTextInputInfo& operator=(const CachedTextInputInfo&) = delete;
void EnsureCached(const ContainerNode& element) const;
PlainTextRange GetComposition(const EphemeralRange& range) const;
PlainTextRange GetPlainTextRange(const EphemeralRange& range) const;
PlainTextRange GetSelection(const EphemeralRange& range) const;
String GetText() const;
bool IsValidFor(const ContainerNode& element) const;
// For cache invalidation
void DidChangeVisibility(const LayoutObject& layout_object);
void DidLayoutSubtree(const LayoutObject& layout_object);
void DidUpdateLayout(const LayoutObject& layout_object);
void LayoutObjectWillBeDestroyed(const LayoutObject& layout_object);
void Trace(Visitor*) const;
private:
class CachedPlainTextRange final {
DISALLOW_NEW();
public:
CachedPlainTextRange(const CachedPlainTextRange&) = delete;
CachedPlainTextRange() = default;
CachedPlainTextRange& operator=(const CachedPlainTextRange&) = delete;
void Clear();
PlainTextRange Get() const;
bool IsValidFor(const EphemeralRange& range) const;
void Set(const EphemeralRange& range, const PlainTextRange& text_range);
void Trace(Visitor*) const;
private:
// |start_| and |end_| can be disconnected from document.
mutable Position start_;
mutable Position end_;
mutable unsigned start_offset_ = kNotFound;
mutable unsigned end_offset_ = kNotFound;
};
static TextIteratorBehavior Behavior();
void ClearIfNeeded(const LayoutObject& layout_object);
PlainTextRange GetPlainTextRangeWithCache(
const EphemeralRange& range,
CachedPlainTextRange* text_range) const;
unsigned RangeLength(const EphemeralRange& range) const;
mutable Member<const ContainerNode> container_;
mutable const LayoutObject* layout_object_ = nullptr;
// Records offset of text node from start of |container_|.
mutable HeapHashMap<Member<const Text>, unsigned> offset_map_;
mutable String text_;
mutable CachedPlainTextRange composition_;
mutable CachedPlainTextRange selection_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_EDITING_IME_CACHED_TEXT_INPUT_INFO_H_
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