/*
    Copyright (c) 2009 Tobias Koenig <tokoe@kde.org>

    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; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#include "contactswitcher.h"

#include <klocale.h>

#include <QtGui/QAbstractItemView>
#include <QtGui/QHBoxLayout>
#include <QtGui/QLabel>
#include <QtGui/QPushButton>

ContactSwitcher::ContactSwitcher( QWidget *parent )
  : QWidget( parent ),
    mView( 0 )
{
  QHBoxLayout *layout = new QHBoxLayout( this );

  mPreviousButton = new QPushButton( i18n( "Previous" ) );
  mNextButton = new QPushButton( i18n( "Next" ) );
  mStatusLabel = new QLabel();

  layout->addWidget( mPreviousButton );
  layout->addWidget( mNextButton );
  layout->addStretch( 1 );
  layout->addWidget( mStatusLabel );

  connect( mPreviousButton, SIGNAL( clicked() ), SLOT( previousClicked() ) );
  connect( mNextButton, SIGNAL( clicked() ), SLOT( nextClicked() ) );
}

void ContactSwitcher::setView( QAbstractItemView *view )
{
  mView = view;

  Q_ASSERT_X( mView->model(), "ContactSwitcher::setView", "The view has no model set!" );

  connect( mView->model(), SIGNAL( layoutChanged() ), SLOT( updateStatus() ) );
  connect( mView->model(), SIGNAL( rowsInserted(const QModelIndex&, int, int) ), SLOT( updateStatus() ) );
  connect( mView->model(), SIGNAL( rowsRemoved(const QModelIndex&, int, int) ), SLOT( updateStatus() ) );

  updateStatus();
}

void ContactSwitcher::nextClicked()
{
  if ( !mView || !mView->model() )
    return;

  const QModelIndex index = mView->selectionModel()->currentIndex();

  int row = 0;
  if ( index.isValid() )
    row = index.row() + 1;

  mView->selectionModel()->setCurrentIndex( mView->model()->index( row, 0 ),
                                            QItemSelectionModel::Rows |
                                            QItemSelectionModel::ClearAndSelect );

  updateStatus();
}

void ContactSwitcher::previousClicked()
{
  if ( !mView || !mView->model() )
    return;

  const QModelIndex index = mView->selectionModel()->currentIndex();

  int row = 0;
  if ( index.isValid() )
    row = index.row() - 1;

  mView->selectionModel()->setCurrentIndex( mView->model()->index( row, 0 ),
                                            QItemSelectionModel::Rows |
                                            QItemSelectionModel::ClearAndSelect );

  updateStatus();
}

void ContactSwitcher::updateStatus()
{
  if ( !mView || !mView->model() )
    return;

  const QModelIndex index = mView->selectionModel()->currentIndex();

  int row = 0;
  if ( index.isValid() )
    row = index.row();

  mPreviousButton->setEnabled( row != 0 );
  mNextButton->setEnabled( row != (mView->model()->rowCount() - 1) );

  mStatusLabel->setText( i18n( "%1 out of %2", row + 1,  mView->model()->rowCount() ) );
}

#include "contactswitcher.moc"
