/*=========================================================================

  Module:    vtkKWNotebook.cxx

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkKWNotebook.h"

#include "vtkKWApplication.h"
#include "vtkKWEvent.h"
#include "vtkKWFrame.h"
#include "vtkKWIcon.h"
#include "vtkKWLabel.h"
#include "vtkKWMenu.h"
#include "vtkKWTkUtilities.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"

#include <vtksys/stl/list>
#include <vtksys/stl/algorithm>

// The amount of padding that is to be added to the internal vertical padding
// of the selected tab (basically defines the additional height of the 
// selected tab compared to an unselected tab).

#define VTK_KW_NB_TAB_SELECT_BD_Y  2

// The amount of horizontal padding separating each tab in the top tab row.

#define VTK_KW_NB_TAB_PADX         1

// The size of the border of each tab (as well as the main notebook body/frame)

#define VTK_KW_NB_TAB_BD           2

// The amount of horizontal padding around the tabs frame itself (i.e. defines
// a margin between the first (respectively last) tab and the left 
// (respectively right) border of the notebook widget

#define VTK_KW_NB_TAB_FRAME_PADX   10

// Given the HSV (Hue, Saturation, Value) of a frame, give the % of Value used
// by the corresponding tab when it is not selected (i.e. dim unselected tabs).

#define VTK_KW_NB_TAB_UNSELECTED_VALUE 0.93

// The color of the border of a pinned tab

#define VTK_KW_NB_TAB_PIN_R 255
#define VTK_KW_NB_TAB_PIN_G 255
#define VTK_KW_NB_TAB_PIN_B 194

//----------------------------------------------------------------------------
vtkStandardNewMacro(vtkKWNotebook);
vtkCxxRevisionMacro(vtkKWNotebook, "1.83");

//----------------------------------------------------------------------------
class vtkKWNotebookInternals
{
public:

  typedef vtksys_stl::list<vtkKWNotebook::Page*> PagesContainer;
  typedef vtksys_stl::list<vtkKWNotebook::Page*>::iterator PagesContainerIterator;
  typedef vtksys_stl::list<vtkKWNotebook::Page*>::reverse_iterator PagesContainerReverseIterator;

  PagesContainer Pages;
  PagesContainer MostRecentPages;
};

//----------------------------------------------------------------------------
void vtkKWNotebook::Page::Delete()
{
  if (this->Title)
    {
    delete [] this->Title;
    this->Title = NULL;
    }

  if (this->Frame)
    {
    this->Frame->Delete();
    this->Frame = NULL;
    }

  if (this->TabFrame)
    {
    this->TabFrame->Delete();
    this->TabFrame = NULL;
    }

  if (this->Label)
    {
    this->Label->Delete();
    this->Label = NULL;
    }

  if (this->ImageLabel)
    {
    this->ImageLabel->Delete();
    this->ImageLabel = NULL;
    }

  if (this->Icon)
    {
    this->Icon->Delete();
    this->Icon = NULL;
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::Page::SetEnabled(int s)
{
  if (this->Frame)
    {
    this->Frame->SetEnabled(s);
    }

  if (this->TabFrame)
    {
    this->TabFrame->SetEnabled(s);
    }

  if (this->Label)
    {
    this->Label->SetEnabled(s);
    }

  if (this->ImageLabel)
    {
    this->ImageLabel->SetEnabled(s);
    }
}

//----------------------------------------------------------------------------
vtkKWNotebook::vtkKWNotebook()
{
  this->MinimumWidth             = 10;
  this->MinimumHeight            = 10;
  this->AlwaysShowTabs           = 0;
  this->ShowAllPagesWithSameTag  = 0;
  this->ShowOnlyPagesWithSameTag = 0;
  this->ShowOnlyMostRecentPages  = 0;
  this->NumberOfMostRecentPages  = 4;
  this->PagesCanBePinned         = 0;
  this->EnablePageTabContextMenu = 0;
  this->ShowIcons                = 0;

  this->IdCounter       = 0;
  this->CurrentId       = -1;
  this->Expanding       = 0;

  this->Body            = vtkKWFrame::New();
  this->Mask            = vtkKWFrame::New();
  this->TabsFrame       = vtkKWFrame::New();
  this->TabPopupMenu    = 0;

  // Internal structs

  this->Internals = new vtkKWNotebookInternals;
}

//----------------------------------------------------------------------------
vtkKWNotebook::~vtkKWNotebook()
{
  if (this->Body)
    {
    this->Body->Delete();
    this->Body = 0;
    }

  if (this->Mask)
    {
    this->Mask->Delete();
    this->Mask = 0;
    }

  if (this->TabsFrame)
    {
    this->TabsFrame->Delete();
    this->TabsFrame = 0;
    }

  if (this->TabPopupMenu)
    {
    this->TabPopupMenu->Delete();
    this->TabPopupMenu = 0;
    }

  // Delete all pages

  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it)
        {
        (*it)->Delete();
        delete *it;
        }
      }
    delete this->Internals;
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::Create(vtkKWApplication *app)
{
  // Check if already created

  if (this->IsCreated())
    {
    vtkErrorMacro(<< this->GetClassName() << " already created");
    return;
    }

  // Call the superclass to create the whole widget

  this->Superclass::Create(app);

  ostrstream cmd;

  cmd << this->GetWidgetName() << " configure -width " << this->MinimumWidth 
      <<  " -height " << this->MinimumHeight << " -bd 0 -relief flat " << endl;

  // Create the frame that stores the tabs button

  this->TabsFrame->SetParent(this);
  this->TabsFrame->Create(app);

  cmd << "pack " << this->TabsFrame->GetWidgetName() 
      << " -fill x -expand y -side top -anchor n " 
      << " -padx " << VTK_KW_NB_TAB_FRAME_PADX << endl;

  // Create the frame where each page will be mapped

  this->Body->SetParent(this);
  this->Body->Create(app);

  cmd << this->Body->GetWidgetName() << " config -relief raised "
      << " -bd " << VTK_KW_NB_TAB_BD << endl;

  // Create the mask used to hide the seam between the current active tab and
  // the body (i.e. between the tab and the corresponding page under the tab).

  this->Mask->SetParent(this);
  this->Mask->Create(app);

  // Bind <Configure> event to both the tabs frame (in case a tab is added
  // and its size requires the whole widget to be resized) and the body.

  cmd << "bind " << this->TabsFrame->GetWidgetName() << " <Configure> {" 
      << this->GetTclName() << " ScheduleResize}" << endl;

  cmd << "bind " << this->Body->GetWidgetName() << " <Configure> {" 
      << this->GetTclName() << " ScheduleResize}" << endl;

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);

  // Update enable state

  this->UpdateEnableState();
}

//----------------------------------------------------------------------------
vtkKWNotebook::Page* vtkKWNotebook::GetPage(int id)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Id == id)
        {
        return (*it);
        }
      }
    }

  return NULL;
}

//----------------------------------------------------------------------------
vtkKWNotebook::Page* vtkKWNotebook::GetPage(const char *title)
{
  if (title && this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Title && !strcmp(title, (*it)->Title))
        {
        return (*it);
        }
      }
    }

  return NULL;
}

//----------------------------------------------------------------------------
vtkKWNotebook::Page* vtkKWNotebook::GetPage(const char *title, int tag)
{
  if (title && this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag == tag && 
          (*it)->Title && !strcmp(title, (*it)->Title))
        {
        return (*it);
        }
      }
    }

  return NULL;
}

//----------------------------------------------------------------------------
vtkKWNotebook::Page* vtkKWNotebook::GetFirstVisiblePage()
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Visibility)
        {
        return (*it);
        }
      }
    }

  return NULL;
}

//----------------------------------------------------------------------------
vtkKWNotebook::Page* vtkKWNotebook::GetFirstPageMatchingTag(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag == tag)
        {
        return (*it);
        }
      }
    }

  return NULL;
}

//----------------------------------------------------------------------------
vtkKWNotebook::Page* vtkKWNotebook::GetFirstPackedPageNotMatchingTag(int tag)
{
  if (!this->IsCreated())
    {
    return NULL;
    }

  // Get the slaves in the tabs frame

  char **slaves = 0;
  int nb_slaves = vtkKWTkUtilities::GetSlavesInPack(this->TabsFrame, &slaves);
  if (!nb_slaves)
    {
    return NULL;
    }

  // Iterate over each slave and find the corresponding page and its tag

  vtkKWNotebook::Page *found = NULL;
  int i;
  for (i = 0 ; i < nb_slaves && !found; i++)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag != tag && 
          !strcmp(slaves[i], (*it)->TabFrame->GetWidgetName()))
        {
        found = *it;
        break;
        }
      }
    }

  // Deallocate slaves

  for (i = 0 ; i < nb_slaves; i++)
    {
    delete [] slaves[i];
    }
  delete [] slaves;

  return found;
}

//----------------------------------------------------------------------------
unsigned int vtkKWNotebook::GetNumberOfPages()
{
  return (unsigned int)this->Internals->Pages.size();
}

//----------------------------------------------------------------------------
unsigned int  vtkKWNotebook::GetNumberOfPagesMatchingTag(int tag)
{
  unsigned int count = 0;

  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag == tag)
        {
        ++count;
        }
      }
    }

  return count;
}

//----------------------------------------------------------------------------
unsigned int vtkKWNotebook::GetNumberOfVisiblePages()
{
  unsigned int count = 0;

  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Visibility)
        {
        ++count;
        }
      }
    }

  return count;
}

//----------------------------------------------------------------------------
unsigned int vtkKWNotebook::GetNumberOfVisiblePagesMatchingTag(int tag)
{
  unsigned int count = 0;

  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Visibility && (*it)->Tag == tag)
        {
        ++count;
        }
      }
    }

  return count;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetVisiblePageId(int idx)
{
  // As a convenience, if ShowOnlyMostRecentPages is On, return the 
  // GetMostRecentPageId, since it provides a better clue about the tab 
  // ordering.

  if (this->ShowOnlyMostRecentPages)
    {
    return this->GetMostRecentPageId(idx);
    }

  if (this->Internals)
    {
    // If not, consider the unpinned page first

    int idx2 = idx;
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Visibility && !(*it)->Pinned && !idx2--)
        {
        return (*it)->Id;
        }
      }

    // Not found ? Now consider the pinned page

    idx2 = idx;
    it = this->Internals->Pages.begin();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Visibility && (*it)->Pinned && !idx2--)
        {
        return (*it)->Id;
        }
      }
    }

  return -1;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::AreTabsVisible()
{
  int visible_pages = this->GetNumberOfVisiblePages();
  return 
    (visible_pages > 1 || 
     (visible_pages == 1 && this->AlwaysShowTabs)) ? 1 : 0;
}

//----------------------------------------------------------------------------
vtkKWWidget *vtkKWNotebook::GetFrame(int id)
{
  // Return the frame corresponding to that id

  vtkKWNotebook::Page *page = this->GetPage(id);
  if (page)
    {
    return page->Frame;
    }
  return NULL;
}

//----------------------------------------------------------------------------
vtkKWWidget *vtkKWNotebook::GetFrame(const char *title)
{
  // Return the frame corresponding to that title

  vtkKWNotebook::Page *page = this->GetPage(title);
  if (page)
    {
    return page->Frame;
    }
  return NULL;
}

//----------------------------------------------------------------------------
vtkKWWidget *vtkKWNotebook::GetFrame(const char *title, int tag)
{
  // Return the frame corresponding to that title and tag

  vtkKWNotebook::Page *page = this->GetPage(title, tag);
  if (page)
    {
    return page->Frame;
    }
  return NULL;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageIdFromFrameWidgetName(const char *frame_wname)
{
  if (this->IsCreated() && frame_wname && this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Frame && 
          (*it)->Frame->IsCreated() &&
          !strcmp((*it)->Frame->GetWidgetName(), frame_wname))
        {
        return (*it)->Id;
        }
      }
    }

  return -1;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::AddPage(const char *title)
{
  return this->AddPage(title, 0);
}

//----------------------------------------------------------------------------
int vtkKWNotebook::AddPage(const char *title, 
                           const char *balloon)
{
  return this->AddPage(title, balloon, 0);
}

//----------------------------------------------------------------------------
int vtkKWNotebook::AddPage(const char *title, 
                           const char *balloon, 
                           vtkKWIcon *icon)
{
  return this->AddPage(title, balloon, icon, 0);
}

//----------------------------------------------------------------------------
int vtkKWNotebook::AddPage(const char *title, 
                           const char *balloon, 
                           vtkKWIcon *icon,
                           int tag)
{
  if (!this->IsCreated())
    {
    return -1;
    }

  ostrstream cmd;

  // Create a new page, insert it in the container
  
  vtkKWNotebook::Page *page = new vtkKWNotebook::Page;
  this->Internals->Pages.push_back(page);

  // Each page has a unique ID in the notebook lifetime
  // It is visible and not pinned by default

  page->Id = this->IdCounter++;
  page->Pinned = 0;
  page->Tag = tag;

  // Create the page frame (this is where user-defined widgets will be packed)

  page->Frame = vtkKWFrame::New();
  page->Frame->SetParent(this->Body);
  page->Frame->Create(this->GetApplication());

  // Store the page title for fast page retrieval on title

  page->Title = new char [strlen(title) + 1];
  strcpy(page->Title, title);

  // Create the "tab" part of the page

  page->TabFrame = vtkKWFrame::New();
  page->TabFrame->SetParent(this->TabsFrame);
  page->TabFrame->Create(this->GetApplication());

  cmd << page->TabFrame->GetWidgetName() << " config -relief raised "
      << " -bd " << VTK_KW_NB_TAB_BD << endl;

  // Create the label that holds the page title

  page->Label = vtkKWLabel::New();
  page->Label->SetParent(page->TabFrame);
  page->Label->Create(this->GetApplication());
  page->Label->SetHighlightThickness(0);
  page->Label->SetText(page->Title);
  if (balloon)
    {
    page->Label->SetBalloonHelpString(balloon);
    }

  cmd << "pack " << page->Label->GetWidgetName() 
      << " -side left -fill both -expand y -anchor c" << endl;

  // Create the icon if any. We want to keep both the icon and the image label
  // since the icon is required to recreate the label when its background
  // color changes

  page->ImageLabel = 0;
  page->Icon = 0;

  if (icon && icon->GetData())
    {
    page->Icon = vtkKWIcon::New();
    page->Icon->SetImage(icon);

    page->ImageLabel = vtkKWLabel::New();
    page->ImageLabel->SetParent(page->TabFrame);
    page->ImageLabel->Create(this->GetApplication());
    page->ImageLabel->SetImageOption(page->Icon);

    if (this->ShowIcons)
      {
      cmd << "pack " << page->ImageLabel->GetWidgetName() 
          << " -side left -fill both -anchor c "
          << " -before " << page->Label->GetWidgetName() << endl;
      }
    }

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);

  page->SetEnabled(this->GetEnabled());
  if (this->GetEnabled())
    {
    this->BindPage(page);
    }
  else
    {
    this->UnBindPage(page);
    }

  // Show the page. Set Visibility to Off first. If this page can really
  // be shown, Visibility will be set to On automatically.
  // Do not show anything if we are maintaining a list of most recent pages
  // shown (which should be controled by the user, not the way developpers
  // have added pages).

  page->Visibility = 0;
  
  if (!this->ShowOnlyMostRecentPages)
    {
    this->ShowPage(page);
    }

  return page->Id;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::BindPage(vtkKWNotebook::Page *page)
{
  if (!page || !this->IsCreated())
    {
    return;
    }

  ostrstream cmd;

  if (page->Label && page->Label->IsCreated())
    {
    cmd << "bind " << page->Label->GetWidgetName() << " <Button-1> {" 
        << this->GetTclName() << " RaiseCallback " << page->Id << "}" << endl
        << "bind " << page->Label->GetWidgetName() << " <Double-1> {" 
        << this->GetTclName()<<" TogglePagePinnedCallback " << page->Id << "}" 
        << endl
        << "bind " << page->Label->GetWidgetName() << " <Button-3> {" 
        << this->GetTclName() << " PageTabContextMenuCallback " << page->Id 
        << " %%X %%Y}" 
        << endl;
    }

  if (page->ImageLabel && page->ImageLabel->IsCreated())
    {
    cmd << "bind " << page->ImageLabel->GetWidgetName() << " <Button-1> {" 
        << this->GetTclName() << " RaiseCallback " << page->Id << "}" << endl;
    }

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UnBindPage(vtkKWNotebook::Page *page)
{
  if (!page || !this->IsCreated())
    {
    return;
    }

  ostrstream cmd;

  if (page->Label && page->Label->IsCreated())
    {
    cmd << "bind " << page->Label->GetWidgetName() << " <Button-1> {}\n"
        << "bind " << page->Label->GetWidgetName() << " <Double-1> {}\n"
        << "bind " << page->Label->GetWidgetName() << " <Button-3> {}\n";
    }

  if (page->ImageLabel && page->ImageLabel->IsCreated())
    {
    cmd << "bind " << page->ImageLabel->GetWidgetName() << " <Button-1> {}\n";
    }

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);
}

//----------------------------------------------------------------------------
int vtkKWNotebook::HasPage(int id)
{
  return this->GetPage(id) ? 1 : 0;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::HasPage(const char *title, int tag)
{
  return this->GetPage(title, tag) ? 1 : 0;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageId(const char *title, int tag)
{
  vtkKWNotebook::Page *page = this->GetPage(title, tag);
  if (page)
    {
    return page->Id;
    }
  return -1;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::RemovePage(int id)
{
  return this->RemovePage(this->GetPage(id));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::RemovePage(const char *title)
{
  return this->RemovePage(this->GetPage(title));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::RemovePage(vtkKWNotebook::Page *page)
{
  if (!this->IsCreated())
    {
    return 0;
    }

  if (page == NULL)
    {
    vtkErrorMacro("Can not remove a NULL page from the notebook.");
    return 0;
    }

  // Hide the page

  this->UnpinPage(page);
  this->HidePage(page);

  // Remove the page from the container

  vtkKWNotebookInternals::PagesContainerIterator pos = 
    vtksys_stl::find(this->Internals->Pages.begin(),
                 this->Internals->Pages.end(),
                 page);

  if (pos == this->Internals->Pages.end())
    {
    vtkErrorMacro("Error while removing a page from the notebook "
                  "(can not find the page).");
    return 0;
    }

  this->Internals->Pages.erase(pos);

  // Delete the page

  page->Delete();
  delete page;

  // Bring or remove more pages depending on options
  
  this->ConstrainVisiblePages();

  // Schedule a resize since removing a page might make a the tab frame smaller
  // (the <Configure> event might do the trick too, but I don't trust Tk, 
  // yadi yada...)

  this->ScheduleResize();

  return 1;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::RemovePagesMatchingTag(int tag)
{
  if (this->Internals)
    {
    // This is not too efficient, but we are talking at most two dozens
    // element anyway. We could save the iterator value, then go to the next
    // position, and remove at the old iterator value, but too many
    // STL related operations take place in ::RemovePage, invalidating the
    // list iterators. Let's keep it simple.

    int keep_going;
    do
      {
      keep_going = 0;
      vtkKWNotebookInternals::PagesContainerIterator it = 
        this->Internals->Pages.begin();
      vtkKWNotebookInternals::PagesContainerIterator end = 
        this->Internals->Pages.end();
      while (it != end)
        {
        if (*it && (*it)->Tag == tag)
          {
          this->RemovePage(*it);
          keep_going = 1;
          break;
          }
        ++it;
        }
      } while (keep_going);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::Raise(int id)
{
  this->RaisePage(this->GetPage(id));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::Raise(const char *title)
{
  this->RaisePage(this->GetPage(title));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::Raise(const char *title, int tag)
{
  this->RaisePage(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::RaisePage(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }
  
  // Lower the current one (unpack the page, shrink the selected tab)

  if (page->Id != this->CurrentId)
    {
    vtkKWNotebook::Page *old_page = this->GetPage(this->CurrentId);
    if (old_page)
      {
      this->LowerPage(old_page);
      }
    }

  // Set the selected page

  this->CurrentId = page->Id;

  // A raised page becomes automatically visible 
  // (i.e., it's a way to unhide it)

  page->Visibility = 1;

  // Show the tab body

  ostrstream cmd;
  cmd << "pack " << page->Frame->GetWidgetName() 
      << " -fill both -anchor n -expand 1" 
      << endl;

  // Show the page tab

  this->ShowPageTab(page);
  
  // Select the page tab: enlarge it

  cmd << "pack " << page->TabFrame->GetWidgetName() 
      << " -ipadx 0 -ipady " << VTK_KW_NB_TAB_SELECT_BD_Y 
      << " -padx " << VTK_KW_NB_TAB_PADX
      << endl;

  // Warning: the following can have *very* nasty side effects. For example, 
  // select a vtkKWView might trigger a ViewSelectedEvent that will bring
  // up the UI for that view. If showing that UI involves raising a page,
  // the focus will be lost *aynchronously* (because of the events). Therefore,
  // although the view has been selected, the focus is not in the view, and
  // events like keys might not be triggered.
  // => Let's NOT use it :) Focus is evil.
  // cmd << "focus " << page->Frame->GetWidgetName() << endl;

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);
  
  // Update the page color

  this->UpdatePageTabBackgroundColor(page, 1);
 
  // Bring or remove more pages depending on options
  
  this->ConstrainVisiblePages();

  // Schedule a resize since raising a page might make a larger tab or a larger
  // page show up (the <Configure> event might do the trick too, but I don't
  // trust Tk that much)

  this->ScheduleResize();

  // Now the page has been raised so it should be put on top of the most recent
  // pages

  this->PutOnTopOfMostRecentPages(page);
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetRaisedPageId()
{
  return this->CurrentId;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::RaiseFirstPageMatchingTag(int tag)
{
  this->RaisePage(this->GetFirstPageMatchingTag(tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPageTab(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }
  
  ostrstream cmd;
  cmd << "pack " << page->TabFrame->GetWidgetName() << " -side left -anchor s";

  // If the tab was not packed, we are about to bring up a new page tab
  // which should be enqueue in the most recent pages list.

  if (this->ShowOnlyMostRecentPages && 
      page->Visibility && 
      !page->TabFrame->IsPacked())
    {
    this->AddToMostRecentPages(page);

    // Also, if we show only the most recent pages, the expected behaviour 
    // would be to bring the page so that it is packed as the first one 
    // in the list.
    // If ShowAllPagesWithSameTag is Off, just pack the tab in front of all
    // others, otherwise try to pack in front of the first page that has a
    // different tag, so that pages with the same tag will still be packed
    // in the right order.

    if (page->TabFrame->GetParent()->GetNumberOfPackedChildren())
      {
      if (!this->ShowAllPagesWithSameTag)
        {
        cmd << " -before [lindex [pack slaves " 
            << page->TabFrame->GetParent()->GetWidgetName() << "] 0]";
        }
      else
        {
        vtkKWNotebook::Page *other_page = 
          this->GetFirstPackedPageNotMatchingTag(page->Tag);
        if (other_page)
          {
          cmd << " -before " << other_page->TabFrame->GetWidgetName();
          }
        else
          {
          cmd << " -before [lindex [pack slaves " 
              << page->TabFrame->GetParent()->GetWidgetName() << "] 0]";
          }
        }
      }
    }

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPageTabAsLow(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }
  
  // Show the page tab

  this->ShowPageTab(page);

  // Unselect the page tab: shrink it (no ipady)

  this->Script("pack %s -ipadx 0 -ipady 0 -padx %d",
               page->TabFrame->GetWidgetName(), VTK_KW_NB_TAB_PADX);

  // Update the page color (dim it)

  this->UpdatePageTabBackgroundColor(page, 0);

  // Make sure everything has been resized properly

  this->ScheduleResize();
}

//----------------------------------------------------------------------------
void vtkKWNotebook::LowerPage(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }
  
  ostrstream cmd;

  // Unpack the page

  cmd << "pack forget " << page->Frame->GetWidgetName() << endl;

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);

  // Lower the tab (which will schedule a resize)

  this->ShowPageTabAsLow(page);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetPageTag(int id, int tag)
{
  this->SetPageTag(this->GetPage(id), tag);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetPageTag(const char *title, int tag)
{
  this->SetPageTag(this->GetPage(title), tag);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetPageTag(vtkKWNotebook::Page *page, int tag)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }

  page->Tag = tag;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageTag(int id)
{
  return this->GetPageTag(this->GetPage(id));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageTag(const char *title)
{
  return this->GetPageTag(this->GetPage(title));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageTag(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    vtkErrorMacro("Can not query page tag.");
    return 0;
    }

  return page->Tag;
}

//----------------------------------------------------------------------------
char* vtkKWNotebook::GetPageTitle(int id)
{
  return this->GetPageTitle(this->GetPage(id));
}

//----------------------------------------------------------------------------
char* vtkKWNotebook::GetPageTitle(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    vtkErrorMacro("Can not query page title.");
    return 0;
    }

  return page->Title;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPage(int id)
{
  this->ShowPage(this->GetPage(id));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPage(const char *title)
{
  this->ShowPage(this->GetPage(title));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPage(const char *title, int tag)
{
  this->ShowPage(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPage(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated() || page->Visibility)
    {
    return;
    }
  
  // If the number of visible pages is 0, raise this one automatically
    
  if (this->GetNumberOfVisiblePages() == 0)
    {
    this->RaisePage(page);
    return;
    }

  page->Visibility = 1;

  // Otherwise just display the page tab in the non-selected mode "low" mode.

  this->ShowPageTabAsLow(page);

  // Bring or remove more pages depending on options
  
  this->ConstrainVisiblePages();
}

//----------------------------------------------------------------------------
int vtkKWNotebook::CanBeHidden(int id)
{
  return this->CanBeHidden(this->GetPage(id));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::CanBeHidden(const char *title)
{
  return this->CanBeHidden(this->GetPage(title));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::CanBeHidden(const char *title, int tag)
{
  return this->CanBeHidden(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::CanBeHidden(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return -1;
    }
  
  // A pinned page can not be hidden

  return !page->Pinned;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::HidePage(int id)
{
  this->HidePage(this->GetPage(id));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::HidePage(const char *title)
{
  this->HidePage(this->GetPage(title));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::HidePage(const char *title, int tag)
{
  this->HidePage(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::HidePage(vtkKWNotebook::Page *page)
{
  if (page == NULL || 
      !this->IsCreated() || 
      !page->Visibility || 
      !this->CanBeHidden(page))
    {
    return;
    }
  
  page->Visibility = 0;
  
  // If the page to hide is selected, select another one among
  // the visible one (which will be different than the current one since
  // we just removed it from the pool of visible pages).
  // if no other one, set current selection to nothing (-1)
    
  if (page->Id == this->CurrentId)
    {
    vtkKWNotebook::Page *new_page = this->GetFirstVisiblePage();
    if (new_page)
      {
      this->RaisePage(new_page);
      }
    else
      {
      this->LowerPage(page);
      this->CurrentId = -1;
      }
    }

  // If tab to hide was packed, unpack it
  // and dequeue it from the most recent pages list.
  
  if (page->TabFrame->IsPacked())
    {
    this->Script("pack forget %s", page->TabFrame->GetWidgetName());
    if (this->ShowOnlyMostRecentPages)
      {
      this->RemoveFromMostRecentPages(page);
      }
    }

  // Bring or remove more pages depending on options
  
  this->ConstrainVisiblePages();

  // Make sure everything has been resized properly

  this->ScheduleResize();
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetPageVisibility(int id, int flag)
{
  if (flag)
    {
    this->ShowPage(id);
    }
  else
    {
    this->HidePage(id);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetPageVisibility(const char *title, int flag)
{
  if (flag)
    {
    this->ShowPage(title);
    }
  else
    {
    this->HidePage(title);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetPageVisibility(const char *title, int tag, int flag)
{
  if (flag)
    {
    this->ShowPage(title, tag);
    }
  else
    {
    this->HidePage(title, tag);
    }
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageVisibility(int id)
{
  return this->GetPageVisibility(this->GetPage(id));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageVisibility(const char *title)
{
  return this->GetPageVisibility(this->GetPage(title));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageVisibility(const char *title, int tag)
{
  return this->GetPageVisibility(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageVisibility(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return -1;
    }
  
  return page->Visibility;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePageVisibility(int id)
{
  this->TogglePageVisibility(this->GetPage(id));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePageVisibility(const char *title)
{
  this->TogglePageVisibility(this->GetPage(title));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePageVisibility(const char *title, int tag)
{
  this->TogglePageVisibility(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePageVisibility(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }
  
  if (page->Visibility)
    {
    this->HidePage(page);
    }
  else
    {
    this->ShowPage(page);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::HideAllPages()
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it)
        {
        this->HidePage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPagesMatchingTag(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag == tag)
        {
        this->ShowPage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPagesMatchingTagReverse(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerReverseIterator rit = 
      this->Internals->Pages.rbegin();
    vtkKWNotebookInternals::PagesContainerReverseIterator rend = 
      this->Internals->Pages.rend();
    for (; rit != rend; ++rit)
      {
      if (*rit && (*rit)->Tag == tag)
        {
        this->ShowPage(*rit);
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::HidePagesMatchingTag(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag == tag)
        {
        this->HidePage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ShowPagesNotMatchingTag(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag != tag)
        {
        this->ShowPage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::HidePagesNotMatchingTag(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag != tag)
        {
        this->HidePage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
int vtkKWNotebook::AddToMostRecentPages(vtkKWNotebook::Page *page)
{
  if (page == NULL)
    {
    return 0;
    }

  vtkKWNotebookInternals::PagesContainerIterator pos = 
    vtksys_stl::find(this->Internals->MostRecentPages.begin(),
                 this->Internals->MostRecentPages.end(),
                 page);

  if (pos != this->Internals->MostRecentPages.end())
    {
    return 0;
    }

  this->Internals->MostRecentPages.push_front(page);
  return 1;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::RemoveFromMostRecentPages(vtkKWNotebook::Page *page)
{
  if (!this->Internals || page == NULL)
    {
    return 0;
    }

  vtkKWNotebookInternals::PagesContainerIterator pos = 
    vtksys_stl::find(this->Internals->MostRecentPages.begin(),
                 this->Internals->MostRecentPages.end(),
                 page);

  if (pos == this->Internals->MostRecentPages.end())
    {
    return 0;
    }

  this->Internals->MostRecentPages.erase(pos);
  return 1;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::PutOnTopOfMostRecentPages(vtkKWNotebook::Page *page)
{
  this->RemoveFromMostRecentPages(page);
  return this->AddToMostRecentPages(page);
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetMostRecentPageId(int idx)
{
  if (this->Internals &&
      idx >= 0 && idx < (int)this->Internals->MostRecentPages.size())
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->MostRecentPages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->MostRecentPages.end();
    for (; it != end; ++it)
      {
      if (*it && !idx--)
        {
        return (*it)->Id;
        }
      }
    }

  return -1;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::PinPage(int id)
{
  this->PinPage(this->GetPage(id));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::PinPage(const char *title)
{
  this->PinPage(this->GetPage(title));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::PinPage(const char *title, int tag)
{
  this->PinPage(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::PinPage(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }

  page->Pinned = 1;
  this->UpdatePageTabBackgroundColor(page, this->CurrentId == page->Id);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UnpinPage(int id)
{
  this->UnpinPage(this->GetPage(id));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UnpinPage(const char *title)
{
  this->UnpinPage(this->GetPage(title));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UnpinPage(const char *title, int tag)
{
  this->UnpinPage(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UnpinPage(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }

  page->Pinned = 0;
  this->UpdatePageTabBackgroundColor(page, this->CurrentId == page->Id);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::PinPagesMatchingTag(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag == tag)
        {
        this->PinPage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UnpinPagesMatchingTag(int tag)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Tag == tag)
        {
        this->UnpinPage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePagePinned(int id)
{
  this->TogglePagePinned(this->GetPage(id));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePagePinned(const char *title)
{
  this->TogglePagePinned(this->GetPage(title));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePagePinned(const char *title, int tag)
{
  this->TogglePagePinned(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePagePinned(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    return;
    }

  if (page->Pinned)
    {
    this->UnpinPage(page);
    }
  else
    {
    this->PinPage(page);
    }
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPagePinned(int id)
{
  return this->GetPagePinned(this->GetPage(id));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPagePinned(const char *title)
{
  return this->GetPagePinned(this->GetPage(title));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPagePinned(const char *title, int tag)
{
  return this->GetPagePinned(this->GetPage(title, tag));
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPagePinned(vtkKWNotebook::Page *page)
{
  if (page == NULL || !this->IsCreated())
    {
    vtkErrorMacro("Can not query page pinned status.");
    return 0;
    }

  return page->Pinned;
}

//----------------------------------------------------------------------------
unsigned int vtkKWNotebook::GetNumberOfPinnedPages()
{
  unsigned int count = 0;

  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Pinned)
        {
        ++count;
        }
      }
    }

  return count;
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPinnedPageId(int idx)
{
  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Pinned && !idx--)
        {
        return (*it)->Id;
        }
      }
    }

  return -1;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SendEventForPage(unsigned long event, int id)
{
  vtkKWNotebook::Page *page = this->GetPage(id);
  if (page)
    {
    char tag[128];
    sprintf(tag, "%d", page->Tag);
    const char *cargs[2];
    cargs[0] = page->Title;
    cargs[1] = tag;
    this->InvokeEvent(event, cargs);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::RaiseCallback(int id)
{
  this->Raise(id);

  this->SendEventForPage(vtkKWEvent::NotebookRaisePageEvent, id);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePagePinnedCallback(int id)
{
  this->TogglePagePinned(id);

  if (this->GetPagePinned(id))
    {
    this->SendEventForPage(vtkKWEvent::NotebookPinPageEvent, id);
    }
  else
    {
    this->SendEventForPage(vtkKWEvent::NotebookUnpinPageEvent, id);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::TogglePageVisibilityCallback(int id)
{
  this->TogglePageVisibility(id);

  if (this->GetPageVisibility(id))
    {
    this->SendEventForPage(vtkKWEvent::NotebookShowPageEvent, id);
    }
  else
    {
    this->SendEventForPage(vtkKWEvent::NotebookHidePageEvent, id);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::PageTabContextMenuCallback(int id, int x, int y)
{
  if (!this->IsCreated() || !this->EnablePageTabContextMenu)
    {
    return;
    }

  vtkKWNotebook::Page *page = this->GetPage(id);

  if (page == NULL || !page->Visibility)
    {
    return;
    }

  // Create the popup menu if it has not been done already

  if (!this->TabPopupMenu)
    {
    this->TabPopupMenu = vtkKWMenu::New();
    this->TabPopupMenu->SetParent(this);
    this->TabPopupMenu->TearOffOff();
    this->TabPopupMenu->Create(this->GetApplication());
    }

  this->TabPopupMenu->DeleteAllMenuItems();
  char *var;
  
  // Visibility

  var = this->TabPopupMenu->CreateCheckButtonVariable(this, "Show");
  ostrstream visibility;
  visibility << "TogglePageVisibilityCallback " << id << ends;
  this->TabPopupMenu->AddCheckButton(
    "Show", var, this, visibility.str(), "Show/Hide this notebook page");
  this->TabPopupMenu->CheckCheckButton(
    this, "Show", this->GetPageVisibility(page));
  visibility.rdbuf()->freeze(0);
  delete [] var;
    
  // Pin

  if (this->PagesCanBePinned)
    {
    var = this->TabPopupMenu->CreateCheckButtonVariable(this, "Pin");
    ostrstream pin;
    pin << "TogglePagePinnedCallback " << id << ends;
    this->TabPopupMenu->InsertCheckButton(
      0, "Pin", var, this, pin.str(), "Pin/Unpin this notebook page");
    this->TabPopupMenu->CheckCheckButton(this, "Pin", page->Pinned);
    pin.rdbuf()->freeze(0);
    delete [] var;

    // If a page is pinned, it can not be hidden. Unpin it first :)

    if (page->Pinned)
      {
      this->TabPopupMenu->SetState("Show", vtkKWMenu::StateDisabled);
      }
    }

  this->Script("tk_popup %s %d %d", 
               this->TabPopupMenu->GetWidgetName(), x, y);
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UpdatePageTabBackgroundColor(vtkKWNotebook::Page *page, 
                                                 int selected)
{
  // If selected, use the same tab color as the page, otherwise use
  // a shade of that page color.

  ostrstream cmd;

  if (selected)
    {
    cmd << page->Label->GetWidgetName() << " config -bg [" 
        << page->Frame->GetWidgetName() << " cget -bg]" << endl;

    if (page->Icon)
      {
      this->Script("%s config -bg [%s cget -bg]",
                   page->ImageLabel->GetWidgetName(), 
                   page->Frame->GetWidgetName());
      // Reset the imagelabel so that the icon is blended with the background
      page->ImageLabel->SetImageOption(page->Icon);
      }

    // If the tab is pinned, use a color for the border of the tab
    // and render text italic

    if (!page->Pinned)
      {
      cmd << page->TabFrame->GetWidgetName() << " config -bg [" 
          << page->Frame->GetWidgetName() << " cget -bg]" << endl;
      vtkKWTkUtilities::ChangeFontSlantToRoman(page->Label);
      }
    else
      {
      char color[10];
      sprintf(color, "#%02x%02x%02x", 
              VTK_KW_NB_TAB_PIN_R, VTK_KW_NB_TAB_PIN_G, VTK_KW_NB_TAB_PIN_B);
      cmd << page->TabFrame->GetWidgetName() 
          << " config -bg " << color << endl;
      vtkKWTkUtilities::ChangeFontSlantToItalic(page->Label);
      }
    }
  else
    {
    // Compute the shaded color based on the current frame background color

    double fr, fg, fb;
    page->Frame->GetBackgroundColor(&fr, &fg, &fb);

    double fh, fs, fv;
    if (fr == fg && fg == fb)
      {
      fh = fs = 0.0;
      fv = fr;
      }
    else
      {
      vtkMath::RGBToHSV(fr, fg, fb, &fh, &fs, &fv);
      }

    double r, g, b;
    fv *= VTK_KW_NB_TAB_UNSELECTED_VALUE;
    vtkMath::HSVToRGB(fh, fs, fv, &r, &g, &b);

    char shade[10];
    sprintf(shade, "#%02x%02x%02x", 
            (int)(r * 255.0), (int)(g * 255.0), (int)(b * 255.0));
    
    cmd << page->Label->GetWidgetName() << " config -bg " << shade << endl;

    if (page->Icon)
      {
      this->Script("%s config -bg %s", 
                   page->ImageLabel->GetWidgetName(), shade);
      // Reset the imagelabel so that the icon is blended with the background
      page->ImageLabel->SetImageOption(page->Icon);
      }

    // If the tab is pinned, use a different hue for the border of the tab

    if (!page->Pinned)
      {
      cmd << page->TabFrame->GetWidgetName() 
          << " config -bg " << shade << endl;
      }
    else
      {
      fr = (double)VTK_KW_NB_TAB_PIN_R / 255.0;
      fg = (double)VTK_KW_NB_TAB_PIN_G / 255.0;
      fb = (double)VTK_KW_NB_TAB_PIN_B / 255.0;

      if (fr == fg && fg == fb)
        {
        fh = fs = 0.0;
        fv = fr;
        }
      else
        {
        vtkMath::RGBToHSV(fr, fg, fb, &fh, &fs, &fv);
        }

      fv *= VTK_KW_NB_TAB_UNSELECTED_VALUE;
      vtkMath::HSVToRGB(fh, fs, fv, &r, &g, &b);

      sprintf(shade, "#%02x%02x%02x", 
              (int)(r * 255.0), (int)(g * 255.0), (int)(b * 255.0));
    
      cmd << page->TabFrame->GetWidgetName() 
          << " config -bg " << shade << endl;
      }
    }

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);

  // If the page that has just been update was the selected page, update the
  // mask position since the color has an influence on the mask size (win32)

#if _WIN32
  if (this->CurrentId == page->Id)
    {
    this->UpdateMaskPosition();
    }
#endif
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UpdateBodyPosition()
{
  if (!this->IsCreated())
    {
    return;
    }

  // If the tabs should not be displayed, place the body so that it uses
  // the whole notebook space

  if (!this->AreTabsVisible())
    {
    this->Script("place %s -x 0 -y 0 -relwidth 1.0 -relheight 1.0 -height 0",
                 this->Body->GetWidgetName());
    }
  else
    {
    // Otherwise get the size of the frame hold the tabs, and place the body
    // right under it, but slightly higher so that the bottom border of the
    // tabs is hidden (which will give the "notebook" look).

    int rheight = atoi(
      this->Script("winfo reqheight %s", this->TabsFrame->GetWidgetName()));

    // if 1, then we have not been mappep/configured at the moment, but this
    // function will be called by Resize() when Configure is triggered, so
    // we can return safely now.

    if (rheight <= 1)
      {
      return;
      }

    rheight -= VTK_KW_NB_TAB_BD;

    this->Script("place %s -x 0 -y %d -relwidth 1.0 -relheight 1.0 -height %d",
                 this->Body->GetWidgetName(), rheight, -rheight);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UpdateMaskPosition()
{
  if (!this->IsCreated())
    {
    return;
    }

  // If the tabs should not be displayed, don't bother about the mask,
  // just forget it.

  if (!this->AreTabsVisible())
    {
    this->Script("place forget %s", this->Mask->GetWidgetName());
    }
  else
    {
    // Otherwise get the selected page

    vtkKWNotebook::Page *page = this->GetPage(this->CurrentId);
    if (!page)
      {
      vtkErrorMacro("Error while updating the mask position in the notebook "
                    "(no current page)");
      return;
      }

    const char *res;

    // tabs_x: horizontal pos of the tabs container inside the notebook
    // tab_x:  horizontal pos of the selected tab inside the tabs container

    int tabs_x, tab_x = 0, tab_is_mapped;
    res = this->Script("concat [winfo x %s] [winfo ismapped %s]", 
                       this->TabsFrame->GetWidgetName(),
                       page->TabFrame->GetWidgetName());
    sscanf(res, "%d %d", &tabs_x, &tab_is_mapped);

    // For some reasons, even if the tabs container is mapped and its position
    // can be queried, the position of the tab inside the container can not
    // be queried if it is not mapped. In that case use a slower method by
    // computing the size of previous slaves inside the container. Hopefully
    // this will be done only at startup, not in later interaction.
    // UPDATE: if it is mapped, it does not seem to be reliable, so let's use
    // the slowest method anyway.

#if 0
    if (tab_is_mapped)
      {
      tab_x = atoi(
        this->Script("winfo x %s", page->TabFrame->GetWidgetName()));
      }
    else
#endif
      {
      vtkKWTkUtilities::GetSlaveHorizontalPositionInPack(
        this->TabsFrame, page->TabFrame, &tab_x);
      }

    // tab_width: width of the selected tab
    // body_y:    vertical pos of the body (i.e. the page itself)

    int tab_width, body_y;
    res = this->Script("concat [winfo reqwidth %s] [winfo y %s]", 
                       page->TabFrame->GetWidgetName(),
                       this->Body->GetWidgetName());
    sscanf(res, "%d %d", &tab_width, &body_y);

    // Now basically the mask:
    // - starts right after the inner left border of the selected tab 
    //   horizontally, and at the begginning of the body top border vertically
    // - ends right before the inner right border of the selected tab 
    //   horizontally, and at the end of the body top border vertically

    int x0 = tabs_x + tab_x + VTK_KW_NB_TAB_BD;
    int y0 = body_y;
    int w0 = tab_width - VTK_KW_NB_TAB_BD * 2;
    int h0 = VTK_KW_NB_TAB_BD;

    // Now this is a bit trickier for Windows. If the tab frame and the 
    // label have the same background color, the "relief" of the tab is
    // actually drawn by Tk so that the right half of the left border is
    // the same color as the tab background itself. Thus, let's remove
    // this half-size.

#if _WIN32
    double tr, tg, tb, lr, lg, lb;
    page->TabFrame->GetBackgroundColor(&tr, &tg, &tb);
    page->Label->GetBackgroundColor(&lr, &lg, &lb);
    if (tr == lr && tg == lg && tb == lb)
      {
      x0 -= (int)(VTK_KW_NB_TAB_BD * 0.5); 
      w0 += (int)(VTK_KW_NB_TAB_BD * 0.5);
      }
#endif

    this->Script("place %s -x %d -y %d -width %d -height %d",
                 this->Mask->GetWidgetName(), x0, y0, w0, h0);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ScheduleResize()
{  
  if (this->Expanding)
    {
    return;
    }
  this->Expanding = 1;

  // We need a "catch" here since in the "idle time" we could have been
  // destroyed.

  this->Script("after idle {catch {%s Resize}}", this->GetTclName());
}

//----------------------------------------------------------------------------
void vtkKWNotebook::Resize()
{
  if (!this->IsCreated())
    {
    return;
    }

  const char *res;

  // First update the body position, because we need to know where the page
  // location is vertically.

  this->UpdateBodyPosition();

  // We need to compute the height required by both the page and the
  // tabs. First get the width and height of the current page, 
  // and the width of the tabs container

  int height, width, tabs_width;

  res = this->Script(
    "concat [winfo reqheight %s] [winfo reqwidth %s] [winfo reqwidth %s]", 
    this->Body->GetWidgetName(),
    this->Body->GetWidgetName(),
    this->TabsFrame->GetWidgetName());
  sscanf(res, "%d %d %d", &height, &width, &tabs_width);

  // If the tabs container is visible, add the vertical space required for 
  // the tabs to get the total required height (use the body position since
  // the tabs are not completely visible)

  if (this->AreTabsVisible())
    {
    height += atoi(
      this->Script("winfo y %s", this->Body->GetWidgetName()));
    }

  // Now if the tabs require more width than the page, use the tabs width
  // as the new width
  
  if (tabs_width > width)
    {
    width = tabs_width;
    }
  
  // If the new size is smaller than minimum size, use the minimum size

  if (width < this->MinimumWidth)
    {
    width = this->MinimumWidth;
    }
  if (height < this->MinimumHeight)
    {
    height = this->MinimumHeight;
    }

  // Resize the whole notebook to fit the page and the tabs

  this->Script("%s configure -width %d -height %d",
               this->GetWidgetName(), width, height);

  // Update the mask position

  this->UpdateMaskPosition();

  this->Expanding = 0;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetShowIcons(int arg)
{
  if (this->ShowIcons == arg)
    {
    return;
    }
  this->ShowIcons = arg;
  this->Modified();

  if (!this->IsCreated())
    {
    return;
    }

  // Pack or unpack the icons if needed

  ostrstream cmd;

  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Icon)
        {
        if (this->ShowIcons)
          {
          cmd << "pack " << (*it)->ImageLabel->GetWidgetName() 
              << " -side left -before " << (*it)->Label->GetWidgetName() 
              << endl;
          }
        else
          {
          cmd << "pack forget " << (*it)->ImageLabel->GetWidgetName() << endl;
          }
        }
      }
    }

  cmd << ends;
  this->Script(cmd.str());
  cmd.rdbuf()->freeze(0);

  this->ScheduleResize();
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetMinimumWidth(int arg)
{
  if (this->MinimumWidth == arg)
    {
    return;
    }
  this->MinimumWidth = arg;
  this->Modified();

  if (this->IsCreated())
    {
    this->ScheduleResize();
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetMinimumHeight(int arg)
{
  if (this->MinimumHeight == arg)
    {
    return;
    }
  this->MinimumHeight = arg;
  this->Modified();

  if (this->IsCreated())
    {
    this->ScheduleResize();
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetAlwaysShowTabs(int arg)
{
  if (this->AlwaysShowTabs == arg)
    {
    return;
    }
  this->AlwaysShowTabs = arg;
  this->Modified();

  if (this->IsCreated())
    {
    this->ScheduleResize();
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetShowAllPagesWithSameTag(int arg)
{
  if (this->ShowAllPagesWithSameTag == arg)
    {
    return;
    }

  this->ShowAllPagesWithSameTag = arg;
  this->Modified();

  this->ConstrainVisiblePages();
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetShowOnlyPagesWithSameTag(int arg)
{
  if (this->ShowOnlyPagesWithSameTag == arg)
    {
    return;
    }

  this->ShowOnlyPagesWithSameTag = arg;
  this->Modified();

  this->ConstrainVisiblePages();
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetShowOnlyMostRecentPages(int arg)
{
  if (this->ShowOnlyMostRecentPages == arg)
    {
    return;
    }

  this->ShowOnlyMostRecentPages = arg;
  this->Modified();

  // Empty the most recent pages buffer

  if (this->Internals)
    {
    this->Internals->MostRecentPages.clear();
    }

  // If we are enabling this feature, put the current tabs in the most
  // recent pages

  if (this->ShowOnlyMostRecentPages && this->IsCreated())
    {
    char **slaves = 0;
    int nb_slaves = vtkKWTkUtilities::GetSlavesInPack(
      this->TabsFrame, &slaves);

    // Iterate over each slave and find the corresponding page

    if (nb_slaves)
      {
      int i;
      for (i = nb_slaves - 1; i >= 0; i--)
        {
        vtkKWNotebookInternals::PagesContainerIterator it = 
          this->Internals->Pages.begin();
        vtkKWNotebookInternals::PagesContainerIterator end = 
          this->Internals->Pages.end();
        for (; it != end; ++it)
          {
          if (*it && (*it)->TabFrame && (*it)->TabFrame->IsCreated() &&
              !strcmp(slaves[i], (*it)->TabFrame->GetWidgetName()))
            {
            this->AddToMostRecentPages(*it);
            break;
            }
          }
        delete [] slaves[i];
        }
      delete [] slaves;
      }
    }

  // Make sure the constraint are satisfied

  this->ConstrainVisiblePages();
}

//----------------------------------------------------------------------------
void vtkKWNotebook::ConstrainVisiblePages()
{
  if (!this->IsCreated())
    {
    return;
    }

  // Show only the pages with the same tag (as the current selected page,
  // except if it is pinned)

  if (this->ShowOnlyPagesWithSameTag)
    {
    vtkKWNotebook::Page *selected_page = this->GetPage(this->CurrentId);
    if (selected_page && !selected_page->Pinned)
      {
      this->HidePagesNotMatchingTag(selected_page->Tag);
      }
    }

  // Show all pages with the same tag

  if (this->ShowAllPagesWithSameTag)
    {
    if (this->Internals)
      {
      vtkKWNotebookInternals::PagesContainerIterator it = 
        this->Internals->Pages.begin();
      vtkKWNotebookInternals::PagesContainerIterator end = 
        this->Internals->Pages.end();
      for (; it != end; ++it)
        {
        if (*it && (*it)->Visibility)
          {
          this->ShowPagesMatchingTag((*it)->Tag);
          }
        }
      }
    }

  // Show only the most recent pages

  if (this->ShowOnlyMostRecentPages && 
      this->NumberOfMostRecentPages > 0 && 
      ((int)this->Internals->MostRecentPages.size() >
       this->NumberOfMostRecentPages))
    {
    int diff = 
      this->Internals->MostRecentPages.size() - this->NumberOfMostRecentPages;

    // There are more pages than allowed, try to remove some of them

    int keep_going;
    do
      {
      keep_going = 0;
      vtkKWNotebookInternals::PagesContainerIterator it = 
        this->Internals->Pages.begin();
      vtkKWNotebookInternals::PagesContainerIterator end = 
        this->Internals->Pages.end();
      while (diff && it != end)
        {
        if (*it && this->CanBeHidden(*it))
          {
          this->RemoveFromMostRecentPages(*it);
          this->HidePage(*it);
          diff--;
          keep_going = 1;
          break;
          }
        ++it;
        }
      } while (keep_going);
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::SetPagesCanBePinned(int arg)
{
  if (this->PagesCanBePinned == arg)
    {
    return;
    }
  this->PagesCanBePinned = arg;
  this->Modified();

  if (this->IsCreated() && !this->PagesCanBePinned)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && (*it)->Pinned)
        {
        this->UnpinPage(*it);
        }
      }
    }
}

//----------------------------------------------------------------------------
int vtkKWNotebook::GetPageIdContainingCoordinatesInTab(int x, int y)
{
  if (this->IsCreated() && this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it && 
          (*it)->Visibility &&
          (*it)->TabFrame &&
          (*it)->TabFrame->IsCreated() &&
          vtkKWTkUtilities::ContainsCoordinates((*it)->TabFrame, x, y))
        {
        return (*it)->Id;
        }
      }
    }

  return -1;
}

//----------------------------------------------------------------------------
void vtkKWNotebook::UpdateEnableState()
{
  this->Superclass::UpdateEnableState();

  this->PropagateEnableState(this->TabsFrame);
  this->PropagateEnableState(this->Body);
  this->PropagateEnableState(this->Mask);

  if (this->Internals)
    {
    vtkKWNotebookInternals::PagesContainerIterator it = 
      this->Internals->Pages.begin();
    vtkKWNotebookInternals::PagesContainerIterator end = 
      this->Internals->Pages.end();
    for (; it != end; ++it)
      {
      if (*it)
        {
        (*it)->SetEnabled(this->GetEnabled());
        if (this->GetEnabled())
          {
          this->BindPage(*it);
          }
        else
          {
          this->UnBindPage(*it);
          }
        }
      }
    }
}

//----------------------------------------------------------------------------
void vtkKWNotebook::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);
  os << indent << "MinimumHeight: " << this->GetMinimumHeight() << endl;
  os << indent << "MinimumWidth: " << this->GetMinimumWidth() << endl;
  os << indent << "NumberOfPages: " << this->GetNumberOfPages() << endl;
  os << indent << "AlwaysShowTabs: " << (this->AlwaysShowTabs ? "On" : "Off")
     << endl;
  os << indent << "ShowAllPagesWithSameTag: " 
     << (this->ShowAllPagesWithSameTag ? "On" : "Off") << endl;
  os << indent << "ShowOnlyPagesWithSameTag: " 
     << (this->ShowOnlyPagesWithSameTag ? "On" : "Off") << endl;
  os << indent << "ShowOnlyMostRecentPages: " 
     << (this->ShowOnlyMostRecentPages ? "On" : "Off") << endl;
  os << indent << "NumberOfMostRecentPages: " 
     << this->GetNumberOfMostRecentPages() << endl;
  os << indent << "ShowIcons: " << (this->ShowIcons ? "On" : "Off")
     << endl;
  os << indent << "PagesCanBePinned: " << (this->PagesCanBePinned ? "On" : "Off")
     << endl;
  os << indent << "EnablePageTabContextMenu: " 
     << (this->EnablePageTabContextMenu ? "On" : "Off")
     << endl;
}

