/* text.hh
 * This file is part of ndk library
 * Copyright (c) 2003,2004 by Stanislav Ievlev
 *
 * This file is covered by the GNU Library General Public License,
 * which should be included with libndk as the file COPYING.
 */
#pragma once

#include <ndk/color.hh>
#include <ndk/frame.hh>
#include <ndk/pad.hh>

namespace ndk
{
  struct color;
}

namespace ndk
{
  // this is a simple container of the multi-line text
  struct text
    : frame
  {
    enum possible_events
    {
      // system events generated by text widget
      changed
    };

    enum wrap_type
    {
      no_wrap,
      wrap
    };

    explicit text (std::string const &title = "", panel *parent = 0, wrap_type wrapping = no_wrap);

    void add_text (color c, std::string const &str);     // append text to the buffer
    void set_text (color c, std::string const &str);     // set current text of the buffer, same as clear+add+draw

    template<typename... Args>
    void add_text (color c, char const *fmt, Args const &...args)
    {
      char buf[BUFSIZ];
      add_text (c, std::string (buf, snprintf (buf, sizeof buf, fmt, args...)));
    }

    bool right ();                              // move text viewport to the right
    bool left ();                               // move text viewport to the left
    bool up ();                                 // move text viewport to the up
    bool down ();                               // move text viewport to the down

    void clear ();                              // clear all text

    int length () const;                        // total length of the text
    int last_line () const;                     // number of the last visible line

    virtual void resize (int w, int h);

  private:
    event::result at_keyboard (const keyboard &ev);

    virtual void draw ();                       // draw frame on the panel

    int string_height (const std::string &str); // number of strings
    int string_width (const std::string &str);  // maximum string length

    int x_;                                     // first viewport position coordinate
    int y_;                                     // second viewport position coordinate
    pad pad_;                                   // internal container for all inner text
    wrap_type wrapping_;                        // made or not wrapping of the inner strings
  };
}