text_editing_delta.h

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// Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_COMMON_TEXT_EDITING_DELTA_H_
#define FLUTTER_SHELL_PLATFORM_COMMON_TEXT_EDITING_DELTA_H_
 
#include <string>
 
#include "flutter/fml/string_conversion.h"
#include "flutter/shell/platform/common/text_range.h"
 
namespace flutter {
 
/// A change in the state of an input field.
struct TextEditingDelta {
  TextEditingDelta(const std::u16string& text_before_change,
                   const TextRange& range,
                   const std::u16string& text);
 
  TextEditingDelta(const std::string& text_before_change,
                   const TextRange& range,
                   const std::string& text);
 
  explicit TextEditingDelta(const std::u16string& text);
 
  explicit TextEditingDelta(const std::string& text);
 
  virtual ~TextEditingDelta() = default;
 
  /// Get the old_text_ value.
  ///
  /// All strings are stored as UTF16 but converted to UTF8 when accessed.
  std::string old_text() const { return fml::Utf16ToUtf8(old_text_); }
 
  /// Get the delta_text value.
  ///
  /// All strings are stored as UTF16 but converted to UTF8 when accessed.
  std::string delta_text() const { return fml::Utf16ToUtf8(delta_text_); }
 
  /// Get the delta_start_ value.
  int delta_start() const { return delta_start_; }
 
  /// Get the delta_end_ value.
  int delta_end() const { return delta_end_; }
 
  bool operator==(const TextEditingDelta& rhs) const {
    return old_text_ == rhs.old_text_ && delta_text_ == rhs.delta_text_ &&
           delta_start_ == rhs.delta_start_ && delta_end_ == rhs.delta_end_;
  }
 
  bool operator!=(const TextEditingDelta& rhs) const { return !(*this == rhs); }
 
  TextEditingDelta(const TextEditingDelta& other) = default;
 
  TextEditingDelta& operator=(const TextEditingDelta& other) = default;
 
 private:
  std::u16string old_text_;
  std::u16string delta_text_;
  int delta_start_;
  int delta_end_;
 
  void set_old_text(const std::u16string& old_text) { old_text_ = old_text; }
 
  void set_delta_text(const std::u16string& delta_text) {
    delta_text_ = delta_text;
  }
 
  void set_delta_start(int delta_start) { delta_start_ = delta_start; }
 
  void set_delta_end(int delta_end) { delta_end_ = delta_end; }
};
 
}  // namespace flutter
 
#endif  // FLUTTER_SHELL_PLATFORM_COMMON_TEXT_EDITING_DELTA_H_