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/*
    This file is part of KOrganizer.

    Copyright (c) 2000,2001 Cornelius Schumacher <[email protected]>
    Copyright (C) 2003-2004 Reinhold Kainhofer <[email protected]>
    Copyright (c) 2005 Rafal Rzepecki <[email protected]>

    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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

    As a special exception, permission is given to link this program
    with any edition of Qt, and distribute the resulting executable,
    without including the source code for Qt in the source distribution.
*/

#include <qpainter.h>

#include <klocale.h>
#include <kdebug.h>
#include <qpainter.h>
#include <qpixmap.h>

#include "kotodoviewitem.h"
#include "kotodoview.h"
#include "koprefs.h"
#include "koglobals.h"

KOTodoViewItem::KOTodoViewItem( QListView *parent, Todo *todo, KOTodoView *kotodo)
  : QCheckListItem( parent , "", CheckBox ), mTodo( todo ), mTodoView( kotodo )
{
  construct();
}

KOTodoViewItem::KOTodoViewItem( KOTodoViewItem *parent, Todo *todo, KOTodoView *kotodo )
  : QCheckListItem( parent, "", CheckBox ), mTodo( todo ), mTodoView( kotodo )
{
  construct();
}

inline int KOTodoViewItem::compareDueDates( const KOTodoViewItem *b ) const
{
  if ( mEffectiveDueDate.isValid() && 
       !b->mEffectiveDueDate.isValid() )
    return -1;
  else if ( !mEffectiveDueDate.isValid() &&
            b->mEffectiveDueDate.isValid() )
    return 1;
  else
    return b->mEffectiveDueDate.secsTo( mEffectiveDueDate );
}

int KOTodoViewItem::compare( QListViewItem *it, int col, bool ascending ) const
{
  KOTodoViewItem *i = dynamic_cast<KOTodoViewItem *>( it );
  if ( !i )
    return QListViewItem::compare( it, col, ascending );
  
  // throw completed todos to the bottom
  if ( mTodo->isCompleted() && !i->todo()->isCompleted() )
    return ascending ? 1 : -1;
  else if ( !mTodo->isCompleted() && i->todo()->isCompleted() )
    return ascending ? -1 : 1;
  
  int c;
  switch ( col ) {
    case ( KOTodoView::eSummaryColumn ):
      return mTodo->summary().localeAwareCompare( i->todo()->summary() );
    case ( KOTodoView::eRecurColumn ):
      return ( mTodo->doesRecur() ? 1 : 0 ) - (i->todo()->doesRecur() ? 1 : 0 );
    case ( KOTodoView::ePriorityColumn ):
      c = mTodo->priority() - i->todo()->priority();
      if ( c )
        return c;
      return compareDueDates( i );
    case ( KOTodoView::ePercentColumn ):
      return mTodo->percentComplete() - i->todo()->percentComplete();
    case ( KOTodoView::eDueDateColumn ):
      c = compareDueDates( i );
      if ( c )
        return c;
      return mTodo->priority() - i->todo()->priority();
    case ( KOTodoView::eCategoriesColumn ):
      return mTodo->categoriesStr().localeAwareCompare( 
                                                  i->todo()->categoriesStr() );
    case ( KOTodoView::eDescriptionColumn ):
      return mTodo->description().localeAwareCompare( i->todo()->description() );
    default:
      Q_ASSERT( false && "unknown column to compare" );
      return QListViewItem::compare( it, col, ascending );
  }
}

#if QT_VERSION >= 300
void KOTodoViewItem::paintBranches(QPainter *p,const QColorGroup & cg,int w,
                                   int y,int h)
{
  QListViewItem::paintBranches(p,cg,w,y,h);
}
#else
#endif

void KOTodoViewItem::construct()
{
  if ( !mTodo ) return;
  m_init = true;

  setOn( mTodo->isCompleted() );
  setText( KOTodoView::eSummaryColumn, mTodo->summary());
  static const QPixmap recurPxmp = KOGlobals::self()->smallIcon("recur");
  if ( mTodo->doesRecur() )
    setPixmap( KOTodoView::eRecurColumn, recurPxmp );
  
  if ( mTodo->priority()==0 ) {
    setText( KOTodoView::ePriorityColumn, i18n("--") );
  } else {
    setText( KOTodoView::ePriorityColumn, QString::number(mTodo->priority()) );
  }
  setText( KOTodoView::ePercentColumn, QString::number(mTodo->percentComplete()) );
  
  if (mTodo->hasDueDate()) {
    QString dtStr = mTodo->dtDueDateStr();
    if (!mTodo->doesFloat()) {
      dtStr += " " + mTodo->dtDueTimeStr();
    }
    setText( KOTodoView::eDueDateColumn, dtStr );
    mEffectiveDueDate = mTodo->dtDue();
    KOTodoViewItem *myParent;
    if ( ( myParent = dynamic_cast<KOTodoViewItem *>( parent() ) ) )
      if ( !myParent->mEffectiveDueDate.isValid() ||
          myParent->mEffectiveDueDate > mEffectiveDueDate ) {
        myParent->mEffectiveDueDate = mEffectiveDueDate;
      }
  } else
    setText( KOTodoView::eDueDateColumn, "" );
  
  setText( KOTodoView::eCategoriesColumn, mTodo->categoriesStr() );

#if 0
  // Find sort id in description. It's the text behind the last '#' character
  // found in the description. White spaces are removed from beginning and end
  // of sort id.
  int pos = mTodo->description().findRev('#');
  if (pos < 0) {
    setText( KOTodoView::eDescriptionColumn, "" );
  } else {
    QString str = mTodo->description().mid(pos+1);
    str.stripWhiteSpace();
    setText( KOTodoView::eDescriptionColumn, str );
  }
#endif

  m_known = false;
  m_init = false;
}

void KOTodoViewItem::stateChange( bool state )
{
  // do not change setting on startup or if no valid todo item is given
  if ( m_init || !mTodo ) return;

  if ( mTodo->isReadOnly() ) {
    setOn( mTodo->isCompleted() );
    return;
  }
  
  kdDebug(5850) << "State changed, modified " << state << endl;
  mTodoView->setNewPercentageDelayed( this, state ? 100 : 0 );
}

bool KOTodoViewItem::isAlternate()
{
#ifndef KORG_NOLVALTERNATION
  KOTodoListView *lv = static_cast<KOTodoListView *>(listView());
  if (lv && lv->alternateBackground().isValid())
  {
    KOTodoViewItem *above = 0;
    above = dynamic_cast<KOTodoViewItem *>(itemAbove());
    m_known = above ? above->m_known : true;
    if (m_known)
    {
       m_odd = above ? !above->m_odd : false;
    }
    else
    {
       KOTodoViewItem *item;
       bool previous = true;
       if (QListViewItem::parent())
       {
          item = dynamic_cast<KOTodoViewItem *>(QListViewItem::parent());
          if (item)
             previous = item->m_odd;
          item = dynamic_cast<KOTodoViewItem *>(QListViewItem::parent()->firstChild());
       }
       else
       {
          item = dynamic_cast<KOTodoViewItem *>(lv->firstChild());
       }

       while(item)
       {
          item->m_odd = previous = !previous;
          item->m_known = true;
          item = dynamic_cast<KOTodoViewItem *>(item->nextSibling());
       }
    }
    return m_odd;
  }
  return false;
#else
  return false;
#endif
}

void KOTodoViewItem::paintCell(QPainter *p, const QColorGroup &cg, int column, int width, int alignment)
{
  QColorGroup _cg = cg;
  // If no todo is set, just don't paint anything...
  if ( !mTodo ) return;
#ifndef KORG_NOLVALTERNATION
  if (isAlternate())
        _cg.setColor(QColorGroup::Base, static_cast< KOTodoListView* >(listView())->alternateBackground());
  if (mTodo->hasDueDate()) {
    if (mTodo->dtDue().date()==QDate::currentDate() &&
        !mTodo->isCompleted()) {
      _cg.setColor(QColorGroup::Base, KOPrefs::instance()->mTodoDueTodayColor);
      _cg.setColor(QColorGroup::Text, getTextColor(KOPrefs::instance()->mTodoDueTodayColor));
    }
    if (mTodo->dtDue().date() < QDate::currentDate() &&
        !mTodo->isCompleted()) {
      _cg.setColor(QColorGroup::Base, KOPrefs::instance()->mTodoOverdueColor);
      _cg.setColor(QColorGroup::Text, getTextColor(KOPrefs::instance()->mTodoOverdueColor));
    }
  }
#endif

  // show the progess by a horizontal bar
  if ( column == KOTodoView::ePercentColumn ) {
    p->save();
    int progress = (int)(( (width-6)*mTodo->percentComplete())/100.0 + 0.5);

    p->fillRect( 0, 0, width, height(), _cg.base() ); // background
    p->setPen( KGlobalSettings::textColor() );  //border
    p->setBrush( KGlobalSettings::baseColor() );  //filling
    p->drawRect( 2, 2, width-4, height()-4);
    p->fillRect( 3, 3, progress, height()-6,
        KGlobalSettings::highlightColor() );
    p->restore();
  } else {
    QCheckListItem::paintCell(p, _cg, column, width, alignment);
  }
}