text_element_lambda.h

来自「rtorrent」· C头文件 代码 · 共 119 行

// rTorrent - BitTorrent client
// Copyright (C) 2005-2006, Jari Sundell
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
// In addition, as a special exception, the copyright holders give
// permission to link the code of portions of this program with the
// OpenSSL library under certain conditions as described in each
// individual source file, and distribute linked combinations
// including the two.
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#ifndef RTORRENT_DISPLAY_TEXT_ELEMENT_LAMBDA_H
#define RTORRENT_DISPLAY_TEXT_ELEMENT_LAMBDA_H

#include "text_element.h"

namespace display {

template <typename slot_type>
class TextElementBranchVoid : public TextElement {
public:
  typedef typename slot_type::result_type   result_type;
  
  TextElementBranchVoid(const slot_type& slot, TextElement* branch1, TextElement* branch2) :
    m_slot(slot), m_branch1(branch1), m_branch2(branch2) {}
  ~TextElementBranchVoid() { delete m_branch1; delete m_branch2; }

  virtual char* print(char* first, char* last, Canvas::attributes_list* attributes, void* object) {
    if (m_slot())
      return m_branch1 != NULL ? m_branch1->print(first, last, attributes, object) : first;
    else
      return m_branch2 != NULL ? m_branch2->print(first, last, attributes, object) : first;
  }

  virtual extent_type max_length() {
    return std::max(m_branch1 != NULL ? m_branch1->max_length() : 0,
                    m_branch2 != NULL ? m_branch2->max_length() : 0);
  }

private:
  slot_type           m_slot;

  TextElement*        m_branch1;
  TextElement*        m_branch2;
};

template <typename slot_type>
class TextElementBranch : public TextElement {
public:
  typedef typename slot_type::argument_type arg1_type;
  typedef typename slot_type::result_type   result_type;
  
  TextElementBranch(const slot_type& slot, TextElement* branch1, TextElement* branch2) :
    m_slot(slot), m_branch1(branch1), m_branch2(branch2) {}
  ~TextElementBranch() { delete m_branch1; delete m_branch2; }

  virtual char* print(char* first, char* last, Canvas::attributes_list* attributes, void* object) {
    if (object == NULL)
      return first;

    if (m_slot(reinterpret_cast<arg1_type>(object)))
      return m_branch1 != NULL ? m_branch1->print(first, last, attributes, object) : first;
    else
      return m_branch2 != NULL ? m_branch2->print(first, last, attributes, object) : first;
  }

  virtual extent_type max_length() {
    return std::max(m_branch1 != NULL ? m_branch1->max_length() : 0,
                    m_branch2 != NULL ? m_branch2->max_length() : 0);
  }

private:
  slot_type           m_slot;

  TextElement*        m_branch1;
  TextElement*        m_branch2;
};

template <typename slot_type>
inline TextElementBranchVoid<slot_type>*
text_element_branch_void(const slot_type& slot, TextElement* branch1, TextElement* branch2) {
  return new TextElementBranchVoid<slot_type>(slot, branch1, branch2);
}

template <typename slot_type>
inline TextElementBranch<slot_type>*
text_element_branch(const slot_type& slot, TextElement* branch1, TextElement* branch2) {
  return new TextElementBranch<slot_type>(slot, branch1, branch2);
}

}

#endif