core/vgui/vgui_soview.cxx

// This is core/vgui/vgui_soview.cxx
//:
// \file
// \author Philip C. Pritchett, RRG, University of Oxford
// \date   24 Mar 1999
// \brief  See vgui_soview.h for a description of this file.
//
// \date Modified 14 Nov 2006, by B. McCane. Set AWF_USE_MAP to 1 so the
// map is used by default and added a destructor that removes the id
// from the map and therefore prevents a memory leak.

#include <iostream>
#include <map>
#include "vgui_soview.h"

#ifdef _MSC_VER
#  include "vcl_msvc_warnings.h"
#endif

#include "vgui/vgui_gl.h"
#include "vgui/vgui_observer.h"
#include "vgui/vgui_style.h"

#define VGUI_STATIC_OBJECT(T, var)                                                                                     \
  static T & var()                                                                                                     \
  {                                                                                                                    \
    static T * t = 0;                                                                                                  \
    if (t == 0)                                                                                                        \
      t = new T();                                                                                                     \
    return *t;                                                                                                         \
  }

#define AWF_USE_MAP 1

unsigned vgui_soview::current_id = 1;

#if AWF_USE_MAP
typedef std::map<unsigned, void *, std::less<unsigned>> Map_soview;
VGUI_STATIC_OBJECT(Map_soview, object_map);
#else
typedef std::vector<void *> Map_soview;
VGUI_STATIC_OBJECT(Map_soview, object_map);
#endif

//: Destructor - delete this soview.
// Modified to erase the id from the map - otherwise we get a memory leak
vgui_soview::~vgui_soview()
{
#if AWF_USE_MAP
  object_map().erase(id);
#endif
}

unsigned
vgui_soview::create_id()
{
  unsigned nid = current_id;
  current_id++;
  return nid;
}

void
vgui_soview::add_id()
{
  id = create_id();
#if AWF_USE_MAP
  object_map().insert(Map_soview::value_type(id, this));
#else
  object_map().resize(id * 2);
  object_map()[id] = this;
#endif
}

vgui_soview *
vgui_soview::id_to_object(unsigned id)
{
#if AWF_USE_MAP
  Map_soview::iterator i = object_map().find(id);
  if (i != object_map().end())
  {
    return static_cast<vgui_soview *>((*i).second);
  }
#else
  if (id < object_map().size())
  {
    return static_cast<vgui_soview *>(object_map()[id]);
  }
#endif

  return nullptr;
}


std::ostream &
vgui_soview::print(std::ostream & s) const
{
  return s << "id " << id;
}


void
vgui_soview::draw_select() const
{
  // default is to draw as normal. Complex objects may override
  // this behaviour.
  //
  this->draw();
}


void
vgui_soview::load_name() const
{
  glLoadName(id);
}


void
vgui_soview::set_colour(float r, float g, float b)
{
  vgui_style_sptr newstyle = vgui_style::new_style();

  newstyle->rgba[0] = r;
  newstyle->rgba[1] = g;
  newstyle->rgba[2] = b;

  if (style)
  {
    newstyle->point_size = style->point_size;
    newstyle->line_width = style->line_width;
  }

  style = newstyle;
}

void
vgui_soview::set_point_size(float s)
{
  vgui_style_sptr newstyle = vgui_style::new_style();

  newstyle->point_size = s;

  if (style)
  {
    newstyle->rgba[0] = style->rgba[0];
    newstyle->rgba[1] = style->rgba[1];
    newstyle->rgba[2] = style->rgba[2];
    newstyle->line_width = style->line_width;
  }

  style = newstyle;
}

void
vgui_soview::set_line_width(float w)
{
  vgui_style_sptr newstyle = vgui_style::new_style();

  newstyle->line_width = w;

  if (style)
  {
    newstyle->rgba[0] = style->rgba[0];
    newstyle->rgba[1] = style->rgba[1];
    newstyle->rgba[2] = style->rgba[2];
    newstyle->point_size = style->point_size;
  }

  style = newstyle;
}


//
const void * const vgui_soview::msg_select = "select";
const void * const vgui_soview::msg_deselect = "deselect";
const void * const vgui_soview::msg_highlight = "highlight";
const void * const vgui_soview::msg_unhighlight = "unhighlight";


//--------------------------------------------------------------------------------

// Observers. Rather than storing a std::list/std::vector/whatever of observers on each
// soview, we maintain a static multimap from soviews to observers. This makes
// the soviews smaller and optimizes the common case of soviews with no
// observers.
// fsm: I have not tested this code yet -- where is it used?

// vc++ static data members have some peculiarities, so
// we use this traditional work-around instead :
typedef std::multimap<void *, void *, std::less<void *>> mmap_Pv_Pv;
static mmap_Pv_Pv &
the_map()
{
  static mmap_Pv_Pv * ptr = nullptr;
  if (!ptr)
    ptr = new mmap_Pv_Pv;
  return *ptr;
}

void
vgui_soview::attach(vgui_observer * o)
{
  the_map().insert(mmap_Pv_Pv::value_type(this, o));
}

void
vgui_soview::detach(vgui_observer * o)
{
  mmap_Pv_Pv::iterator lo = the_map().lower_bound(this);
  mmap_Pv_Pv::iterator hi = the_map().upper_bound(this);
  for (mmap_Pv_Pv::iterator i = lo; i != hi; ++i)
    if ((*i).second == o)
    {
      the_map().erase(i);
      return;
    }

  // not found :
  std::cerr << __FILE__ " : no such observer on this soview\n";
}

void
vgui_soview::get_observers(std::vector<vgui_observer *> & vobs) const
{
  mmap_Pv_Pv::const_iterator lo = the_map().lower_bound(const_cast<vgui_soview *>(this));
  mmap_Pv_Pv::const_iterator hi = the_map().upper_bound(const_cast<vgui_soview *>(this));
  for (mmap_Pv_Pv::const_iterator i = lo; i != hi; ++i)
    vobs.push_back(static_cast<vgui_observer *>((*i).second));
}

// These two method could be optimized a bit.
void
vgui_soview::notify() const
{
  std::vector<vgui_observer *> vobs;
  get_observers(vobs);
  for (unsigned i = 0; i < vobs.size(); ++i)
    vobs[i]->update();
}

void
vgui_soview::notify(vgui_message const & msg) const
{
  std::vector<vgui_observer *> vobs;
  get_observers(vobs);
  for (unsigned i = 0; i < vobs.size(); ++i)
    vobs[i]->update(msg);
}