/***************************************************************************
                         SIMPLY POWERFUL TOOLKIT (SPTK)
                         CSplitter.cpp -  description
                            -------------------
   begin                : Tue Jan 27 2004
   copyright            : (C) 2002-2005 by Alexey S.Parshin
   email                : alexeyp@gmail.com
***************************************************************************/

/***************************************************************************
   This library is free software; you can redistribute it and/or modify it
   under the terms of the GNU Library General Public License as published by
   the Free Software Foundation; either version 2 of the License, or (at
   your option) any later version.

   This library 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 Library
   General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

   Please report all bugs and problems to "alexeyp@gmail.com"
 ***************************************************************************/

#include <sptk3/CSplitter.h>
#include <stdio.h>
#include <FL/Fl.h>
#include <FL/Fl_Window.h>
#include <FL/fl_draw.h>
#include <sptk3/CGroup.h>

CSplitter::CSplitter( const char * label, int layoutSize, CLayoutAlign layoutAlign )
: CBox( label, layoutSize, layoutAlign ) {
   m_chainedWidget = 0L;
   m_dragging = false;
   box(FL_THIN_UP_BOX);
}

int CSplitter::handle( int event ) {

   switch ( event ) {
      case FL_ENTER:
         switch (m_layoutAlign) {
            case SP_ALIGN_TOP:
            case SP_ALIGN_BOTTOM:
               fl_cursor( FL_CURSOR_NS );
               break;
            case SP_ALIGN_RIGHT:
            case SP_ALIGN_LEFT:
               fl_cursor( FL_CURSOR_WE );
               break;
            default:
               break;
         }
         break;

      case FL_LEAVE:
         fl_cursor( FL_CURSOR_ARROW ); 
         break;

      case FL_PUSH:
         m_lastDragX = Fl::event_x();
         m_lastDragY = Fl::event_y();
         m_dragging = true;
         findChainedControl();
         return true;

      case FL_RELEASE:
         m_dragging = false;
         return true;

      case FL_DRAG:
         if (m_chainedWidget) {
            //puts("DRAGGING");
            int dx = Fl::event_x() - m_lastDragX;
            int dy = Fl::event_y() - m_lastDragY;
            m_lastDragX = Fl::event_x();
            m_lastDragY = Fl::event_y();
            int newW = m_chainedWidget->w();
            int newH = m_chainedWidget->h();
            switch (m_layoutAlign) {
               case SP_ALIGN_TOP:
                  newH += dy;
                  m_chainedWidgetLayout->preferredSize(newW,newH);
                  m_chainedWidgetLayout->layoutSize(newH);
                  break;
               case SP_ALIGN_BOTTOM:
                  newH -= dy;
                  m_chainedWidgetLayout->preferredSize(newW,newH);
                  m_chainedWidgetLayout->layoutSize(newH);
                  break;
               case SP_ALIGN_LEFT:
                  newW += dx;
                  m_chainedWidgetLayout->preferredSize(newW,newH);
                  m_chainedWidgetLayout->layoutSize(newW);
                  break;
               case SP_ALIGN_RIGHT:
                  newW -= dx;
                  m_chainedWidgetLayout->preferredSize(newW,newH);
                  m_chainedWidgetLayout->layoutSize(newW);
                  break;
               default:
                  break;
            }
            CLayoutManager *parentManager = dynamic_cast<CLayoutManager *>(parent());
            if (parentManager) {
               parentManager->relayout();
               CGroup *parentGroup = dynamic_cast<CGroup *>(parent());
               if (parentGroup) {
                  //puts("Group");
                  parentGroup->redraw();
               } else {
                  //puts("Window");
                  window()->redraw();
               }
            }
         }
         return true;
   }

   return CBox::handle( event );
}

void CSplitter::findChainedControl() {
   m_chainedWidget = 0;
   try {
      if (!dynamic_cast<CLayoutManager *>(parent()))
         return;
      Fl_Group *group = parent();
      unsigned cnt = group->children();
      Fl_Widget *priorWidget = 0;
      Fl_Widget *nextWidget = 0;
      CLayoutClient *priorWidgetLayout = 0;
      CLayoutClient *nextWidgetLayout = 0;
      unsigned index = (unsigned)-1;
      for (unsigned i = 1; i < cnt; i++) {
         if (group->child(i) == this) {
            index = i;
            break;
         }
      }
      if (index < cnt - 1) {
         try {
            priorWidget = group->child(index-1);
            priorWidgetLayout = dynamic_cast<CLayoutClient *>(group->child(index-1));
         }
         catch (...) {}
         try {
            nextWidget = group->child(index+1);
            nextWidgetLayout = dynamic_cast<CLayoutClient *>(group->child(index+1));
         }
         catch (...) {}
      }
      if (priorWidget && priorWidgetLayout->layoutAlign() != SP_ALIGN_CLIENT) {
         m_chainedWidget = priorWidget;
         m_chainedWidgetLayout = priorWidgetLayout;
      } else {
         m_chainedWidget = nextWidget;
         m_chainedWidgetLayout = nextWidgetLayout;
      }

      if (m_chainedWidget) {
         if (m_chainedWidgetLayout->layoutAlign() == SP_ALIGN_NONE) {
            m_chainedWidget = 0;
            return;
         }
         layoutAlign(m_chainedWidgetLayout->layoutAlign());
      }
   } catch (...) {
      return;
   }
}
