/*
 *  copyright (C) 2002-2004
 *  Umbrello UML Modeller Authors <uml-devel@ uml.sf.net>
 */

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

//kde includes
#include <kcursor.h>
#include <kdebug.h>
//app includes
#include "umlview.h"
#include "objectwidget.h"
#include "messagewidget.h"
#include "seqlinewidget.h"

// class members
int const SeqLineWidget::m_nMouseDownEpsilonX = 20;

SeqLineWidget::SeqLineWidget( UMLView * pView, ObjectWidget * pObject ) : QCanvasLine( pView -> canvas() ) {
    m_pView = pView;
    m_pObject = pObject;
    setPen( QPen( m_pObject->getLineColor(), 0, Qt::DashLine ) );
    setZ( 0 );
    setVisible( true );
    m_pDestructionBox.line1 = 0;
    m_nLengthY = 250;
    setupDestructionBox();
    m_pView -> addSeqLine( this );
}

SeqLineWidget::~SeqLineWidget() {}

int SeqLineWidget::onWidget( const QPoint & p ) {
    int nOnWidget = 0;
    QPoint sp = startPoint();
    QPoint ep = endPoint();
    //see if on widget ( for message creation )
    if( sp.x() - m_nMouseDownEpsilonX < p.x()
            && ep.x() + m_nMouseDownEpsilonX > p.x()
            && sp.y() < p.y() && ep.y() + 3 > p.y() )
    {
        nOnWidget = 1;
    }
    return nOnWidget;
}

void SeqLineWidget::cleanup() {
    cleanupDestructionBox();
    m_pView->removeSeqLine( this );
}

void SeqLineWidget::setStartPoint( int startX, int startY ) {
    int endX = startX;
    int endY = startY + m_nLengthY;
    QCanvasLine::setPoints( startX, startY, endX, endY );
    moveDestructionBox();
}

void SeqLineWidget::cleanupDestructionBox() {
    if ( m_pDestructionBox.line1 ) {
        delete m_pDestructionBox.line1;
        m_pDestructionBox.line1 = 0;
        delete m_pDestructionBox.line2;
        m_pDestructionBox.line2 = 0;
    }
}

void SeqLineWidget::setupDestructionBox() {
    cleanupDestructionBox();
    if( !m_pObject->getShowDestruction() ) {
        return;
    }
    QRect rect;
    rect.setX( m_pObject->getX() + m_pObject->getWidth() / 2 - 10 );
    rect.setY( m_pObject->getY() + m_pObject->getHeight() + m_nLengthY );
    rect.setWidth( 14 );
    rect.setHeight( 14 );

    m_pDestructionBox.line1 = new QCanvasLine( m_pView->canvas() );
    m_pDestructionBox.line1->setPoints( rect.x(), rect.y(),
                                        rect.x() + rect.width(), rect.y() + rect.height() );
    m_pDestructionBox.line1->setVisible( true );
    m_pDestructionBox.line1->setPen( QPen(m_pObject->getLineColor(), 2) );
    m_pDestructionBox.line1->setZ( 3 );

    m_pDestructionBox.line2 = new QCanvasLine( m_pView -> canvas() );
    m_pDestructionBox.line2->setPoints( rect.x(), rect.y() + rect.height(), rect.x() + rect.width(), rect.y() );
    m_pDestructionBox.line2->setVisible( true );
    m_pDestructionBox.line2->setPen( QPen(m_pObject->getLineColor(), 2) );
    m_pDestructionBox.line2->setZ( 3 );
}

void SeqLineWidget::moveDestructionBox() {
    if( !m_pDestructionBox.line1 ) {
        return;
    }
    QRect rect;
    rect.setX( m_pObject->getX() + m_pObject->getWidth() / 2 - 7 );
    rect.setY( m_pObject->getY() + m_pObject->getHeight() + m_nLengthY - 7 );
    rect.setWidth( 14 );
    rect.setHeight( 14 );
    m_pDestructionBox.line1->setPoints( rect.x(), rect.y(),
                                        rect.x() + rect.width(), rect.y() + rect.height() );
    m_pDestructionBox.line2->setPoints( rect.x(), rect.y() + rect.height(),
                                        rect.x() + rect.width(), rect.y() );
}

void SeqLineWidget::setEndOfLine(int yPosition) {
    QPoint sp = startPoint();
    int newY = yPosition;
    m_nLengthY = yPosition - m_pObject->getY() - m_pObject->getHeight();
    // normally the managing Objectwidget is responsible for the call of this function
    // but to be sure - make a double check _against current position_
    if ( m_nLengthY < 0 ) {
        m_nLengthY = 0;
        newY = m_pObject->getY() + m_pObject->getHeight();
    }
    setPoints( sp.x(), sp.y(), sp.x(), newY );
    moveDestructionBox();
    m_pView->resizeCanvasToItems();
}

