renderable_message.h

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/******************************************************************************
 * Copyright 2018 The Apollo Authors. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *****************************************************************************/
 
#ifndef TOOLS_CVT_MONITOR_RENDERABLE_MESSAGE_H_
#define TOOLS_CVT_MONITOR_RENDERABLE_MESSAGE_H_
 
#include <string>
 
class Screen;
 
class RenderableMessage {
 public:
  static constexpr int FrameRatio_Precision = 2;
 
  explicit RenderableMessage(RenderableMessage* parent = nullptr,
                             int line_no = 0)
      : line_no_(line_no),
        pages_(1),
        page_index_(0),
        page_item_count_(24),
        parent_(parent),
        frame_ratio_(0.0) {}
 
  virtual ~RenderableMessage() { parent_ = nullptr; }
 
  virtual int Render(const Screen* s, int key) = 0;
  virtual RenderableMessage* Child(int /* line_no */) const = 0;
 
  virtual double frame_ratio(void) { return frame_ratio_; }
 
  RenderableMessage* parent(void) const { return parent_; }
  void set_parent(RenderableMessage* parent) {
    if (parent == parent_) {
      return;
    }
    parent_ = parent;
  }
 
  int page_item_count(void) const { return page_item_count_; }
 
 protected:
  int* line_no(void) { return &line_no_; }
  void set_line_no(int line_no) { line_no_ = line_no; }
  void reset_line_page(void) {
    line_no_ = 0;
    page_index_ = 0;
  }
  void SplitPages(int key);
 
  int line_no_;
  int pages_;
  int page_index_;
  int page_item_count_;
  RenderableMessage* parent_;
  double frame_ratio_;
 
  friend class Screen;
};  // RenderableMessage
 
#endif  // TOOLS_CVT_MONITOR_RENDERABLE_MESSAGE_H_