/*
 *   This file is part of libkdepim.
 *
 *   Copyright (C) 2000 Espen Sand, espen@kde.org
 *   Copyright (C) 2007 Mathias Soeken, msoeken@tzi.de
 *
 *   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.
 *
 */

#include "colorlistbox.h"

#include <KColorDialog>
#include <KColorMimeData>

#include <QDragEnterEvent>
#include <QDragLeaveEvent>
#include <QDragMoveEvent>
#include <QDropEvent>
#include <QHeaderView>
#include <QStringList>

namespace KPIM {

ColorListBox::ColorListBox( QWidget *parent )
  : QTreeWidget( parent ), mCurrentOnDragEnter( 0L )
{
  setColumnCount( 1 );
  setRootIsDecorated( false );
  header()->hide();

  connect( this, SIGNAL(doubleClicked(const QModelIndex&)), this, SLOT(newColor(const QModelIndex&)) );
  setAcceptDrops( true );
}

void ColorListBox::addColor( const QString& text, const QColor& color )
{
  QTreeWidgetItem *item = new QTreeWidgetItem( QStringList() << text );
  item->setData( 0, Qt::DecorationRole, color );
  addTopLevelItem( item );
}

void ColorListBox::setColor( int index, const QColor &color )
{
  if (index < model()->rowCount()) {
    topLevelItem( index )->setData( 0, Qt::DecorationRole, color );
    emit changed();
  }
}

QColor ColorListBox::color( int index ) const
{
  if (index < model()->rowCount()) {
    return topLevelItem( index )->data( 0, Qt::DecorationRole ).value<QColor>();
  } else {
    return Qt::black;
  }
}

void ColorListBox::newColor( const QModelIndex& index )
{
  if( !isEnabled() )
  {
    return;
  }

  if (index.isValid()) {
    QColor c = color( index.row() );
    if (KColorDialog::getColor(c, this) != QDialog::Rejected) {
      setColor( index.row(), c );
    }
  }
}

void ColorListBox::dragEnterEvent( QDragEnterEvent *e )
{
  if (KColorMimeData::canDecode( e->mimeData() ) && isEnabled()) {
    mCurrentOnDragEnter = currentItem();
    e->setAccepted( true );
  }
  else {
    mCurrentOnDragEnter = 0L;
    e->setAccepted( false );
  }
}


void ColorListBox::dragLeaveEvent( QDragLeaveEvent * )
{
  if (mCurrentOnDragEnter) {
    setCurrentItem( mCurrentOnDragEnter );
    mCurrentOnDragEnter = 0L;
  }
}


void ColorListBox::dragMoveEvent( QDragMoveEvent *e )
{
  if (KColorMimeData::canDecode( e->mimeData() ) && isEnabled()) {
    QTreeWidgetItem *item = itemAt( e->pos() );
    if ( item ) {
      setCurrentItem( item );
    }
  }
}


void ColorListBox::dropEvent( QDropEvent *e )
{
  QColor color = KColorMimeData::fromMimeData( e->mimeData() );
  if (color.isValid()) {
    QTreeWidgetItem *item = currentItem();
    if ( item ) {
      item->setData( 0, Qt::DecorationRole, color );
      emit changed();
    }
    mCurrentOnDragEnter = 0L;
  }
}

}

#include "colorlistbox.moc"
