vcanvas.cpp

/* This file is part of the KDE project
   Copyright (C) 2001, 2002, 2003 The Karbon Developers
 
   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 <tqcursor.h>
#include <tqpainter.h>
#include <tqpixmap.h>
 
#include "karbon_view.h"
#include "karbon_part.h"
#include "karbon_drag.h"
#include "vcanvas.h"
#include "vdocument.h"
#include "vpainter.h"
#include "vqpainter.h"
#include "vpainterfactory.h"
#include "vselection.h"
#include "vtoolcontroller.h"
#include "vtool.h"
 
#include <kdebug.h>
#include <tdelocale.h>
#include <kcolordrag.h>
 
int
VCanvas::pageOffsetX() const
{
    double zoomedWidth = m_part->document().width() * m_view->zoom();
    if( contentsWidth() < visibleWidth() )
        return int( 0.5 * ( visibleWidth() - zoomedWidth ) );
    else
        return int( 0.5 * ( contentsWidth() - zoomedWidth ) );
}
 
int
VCanvas::pageOffsetY() const
{
    double zoomedHeight = m_part->document().height() * m_view->zoom();
    if( contentsHeight() < visibleHeight() )
        return int( 0.5 * ( visibleHeight() - zoomedHeight ) );
    else
        return int( 0.5 * ( contentsHeight() - zoomedHeight ) );
}
 
KoPoint VCanvas::snapToGrid( const KoPoint &point )
{
    if( !m_part->document().grid().isSnap )
        return point;
 
    KoPoint p = point;
 
    KoSize dist = m_part->document().grid().snap;
    KoSize dxy = m_part->document().grid().freq;
 
    int dx = tqRound( p.x() / dxy.width() );
    int dy = tqRound( p.y() / dxy.height() );
 
    float distx = TQMIN( TQABS( p.x() - dxy.width() * dx ), TQABS( p.x() - dxy.width() * ( dx + 1 ) ) );
    float disty = TQMIN( TQABS( p.y() - dxy.height() * dy ), TQABS( p.y() - dxy.height() * ( dy + 1 ) ) );
 
    if( distx < dist.width() )
    {
        if( TQABS(p.x() - dxy.width() * dx ) < TQABS( p.x() - dxy.width() * ( dx + 1 ) ) )
            p.rx() = dxy.width() * dx;
        else
            p.rx() = dxy.width() * ( dx + 1 );
    }
 
    if( disty < dist.height() )
    {
        if( TQABS( p.y() - dxy.height() * dy ) < TQABS( p.y() - dxy.height() * ( dy + 1 ) ) )
            p.ry() = dxy.height() * dy;
        else
            p.ry() = dxy.height() * ( dy + 1 );
    }
 
    return p;
}
 
 
VCanvas::VCanvas( TQWidget *parent, KarbonView* view, KarbonPart* part )
    : TQScrollView( parent, "canvas", WStaticContents/*WNorthWestGravity*/ | WResizeNoErase  |
      WRepaintNoErase ), m_part( part ), m_view( view )
{
    connect(this, TQ_SIGNAL( contentsMoving( int, int ) ), this, TQ_SLOT( slotContentsMoving( int, int ) ) );
    viewport()->setFocusPolicy( TQWidget::StrongFocus );
 
    viewport()->setMouseTracking( true );
    setMouseTracking( true );
 
    viewport()->setBackgroundColor( TQt::white );
    viewport()->setBackgroundMode( TQWidget::NoBackground );
    viewport()->installEventFilter( this );
 
    resizeContents( 800, 600 );
    m_pixmap = new TQPixmap( 800, 600 );
 
    setFocus();
 
    setAcceptDrops( true );
}
 
VCanvas::~VCanvas()
{
    delete m_pixmap;
    m_view = 0L;
    m_part = 0L;
}
 
void
VCanvas::setPos( const KoPoint& p )
{
    KoPoint p2 = toViewport( p );
    TQCursor::setPos( mapToGlobal( TQPoint( int(p2.x()), int(p2.y()) ) ) );
}
 
bool
VCanvas::eventFilter( TQObject* object, TQEvent* event )
{
    TQScrollView::eventFilter( object, event );
 
    if( event->type() == TQEvent::AccelOverride || event->type() == TQEvent::Accel )
        return TQScrollView::eventFilter( object, event );
 
    if( event->type() == TQEvent::KeyPress || event->type() == TQEvent::KeyRelease )
        return m_view->keyEvent( event );
 
    TQMouseEvent* mouseEvent = dynamic_cast<TQMouseEvent*>( event );
 
    if( mouseEvent && m_view )
    {
        KoPoint canvasCoordinate = toContents( KoPoint( mouseEvent->pos() ) );
        return m_view->mouseEvent( mouseEvent, canvasCoordinate );
    }
 
    return false;
}
 
 
// This causes a repaint normally, so just overwriting it omits the repainting
void
VCanvas::focusInEvent( TQFocusEvent * )
{
}
 
KoPoint
VCanvas::toViewport( const KoPoint &p ) const
{
    KoPoint p2 = p;
    p2.setX( ( p.x() * m_view->zoom() ) - contentsX() + pageOffsetX() );
    if( contentsHeight() > height() )
        p2.setY( ( contentsHeight() - ( p.y() * m_view->zoom() + contentsY() + pageOffsetY() ) ) );
    else
        p2.setY( ( height() - p.y() * m_view->zoom() + pageOffsetY() ) );
    return p2;
}
 
KoPoint
VCanvas::toContents( const KoPoint &p ) const
{
    KoPoint p2 = p;
    p2.setX( ( p.x() + contentsX() - pageOffsetX() ) / m_view->zoom() );
    if( contentsHeight() > height() )
        p2.setY( ( contentsHeight() - ( p.y() + contentsY() + pageOffsetY()) ) / m_view->zoom() );
    else
        p2.setY( ( height() - p.y() - pageOffsetY() ) / m_view->zoom() );
    return p2;
}
 
KoRect
VCanvas::boundingBox() const
{
    KoPoint p1( 0, 0 );
    KoPoint p2( width(), height() );
    if( !m_view->documentDeleted() )
    {
        p1 = toContents( p1 );
        p2 = toContents( p2 );
    }
    return KoRect( p1, p2 ).normalize();
}
 
void
VCanvas::setYMirroring( VPainter *p )
{
    TQWMatrix mat;
 
    mat.scale( 1, -1 );
    mat.translate( pageOffsetX(), pageOffsetY() );
 
    if( contentsHeight() > visibleHeight() )
        mat.translate( -contentsX(), contentsY() - contentsHeight() );
    else
        mat.translate( 0, -visibleHeight() );
 
    p->setWorldMatrix( mat );
}
 
void
VCanvas::viewportPaintEvent( TQPaintEvent *e )
{
    TQRect eventRect = e->rect();
    KoRect rect = KoRect::fromTQRect( eventRect );
    
    setYMirroring( m_view->painterFactory()->editpainter() );
    viewport()->setUpdatesEnabled( false );
    VPainter *p = m_view->painterFactory()->painter();
 
    // TODO : only update ROIs
    p->begin();
    p->clear( rect, TQColor( 195, 194, 193 ) );
    p->setZoomFactor( m_view->zoom() );
    setYMirroring( p );
    
    // TRICK : slightly adjust the matrix so libart AA looks better
    TQWMatrix mat = p->worldMatrix();
    p->setWorldMatrix( mat.translate( -.5, -.5 ) );
 
    // set up clippath
    p->newPath();
    p->moveTo( rect.topLeft() );
    p->lineTo( rect.topRight() );
    p->lineTo( rect.bottomRight() );
    p->lineTo( rect.bottomLeft() );
    p->lineTo( rect.topLeft() );
    p->setClipPath();
 
    m_part->document().drawPage( p, m_part->pageLayout(), m_view->showPageMargins() );
    KoRect bbox = boundingBox();
    m_part->document().draw( p, &bbox );
 
    p->resetClipPath();
    p->end();
 
    // draw handle:
    VTQPainter qpainter( p->device() );
    setYMirroring( &qpainter );
    qpainter.setZoomFactor( m_view->zoom() );
    m_part->document().selection()->draw( &qpainter, m_view->zoom() );
 
    if( m_view->toolController()->currentTool() )
        m_view->toolController()->currentTool()->draw( &qpainter );
 
    bitBlt( viewport(), eventRect.topLeft(), p->device(), eventRect );
    viewport()->setUpdatesEnabled( true );
}
 
void
VCanvas::setViewport( double centerX, double centerY )
{
    setContentsPos( int( centerX * contentsWidth() - 0.5 * visibleWidth() ),
                    int( centerY * contentsHeight() - 0.5 * visibleHeight() ) );
}
 
void
VCanvas::setViewportRect( const KoRect &r )
{
    viewport()->setUpdatesEnabled( false );
    double zoomX = m_view->zoom() * ( ( visibleWidth() / m_view->zoom() ) / r.width() );
    double zoomY = m_view->zoom() * ( ( visibleHeight() / m_view->zoom() ) / r.height() );
    double pageOffX = ( contentsWidth() - ( m_part->document().width() * m_view->zoom() ) ) / 2.0;
    double centerX = double( ( r.center().x() ) * m_view->zoom() + pageOffX ) / double( contentsWidth() );
    double pageOffY = ( contentsHeight() - ( m_part->document().height() * m_view->zoom() ) ) / 2.0;
    double centerY = double( ( r.center().y() ) * m_view->zoom() + pageOffY ) / double( contentsHeight() );
    double zoom = zoomX < zoomY ? zoomX : zoomY;
    resizeContents( int( ( zoom / m_view->zoom() ) * contentsWidth() ),
                    int( ( zoom / m_view->zoom() ) * contentsHeight() ) );
    setViewport( centerX, 1.0 - centerY );
    m_view->setZoomAt( zoom );
    viewport()->setUpdatesEnabled( true );
}
 
void
VCanvas::drawContents( TQPainter* painter, int clipx, int clipy,
    int clipw, int cliph  )
{
    drawDocument( painter, KoRect( clipx, clipy, clipw, cliph ) );
}
 
void
VCanvas::drawDocument( TQPainter* /*painter*/, const KoRect&, bool drawVObjects )
{
    setYMirroring( m_view->painterFactory()->editpainter() );
 
    VPainter* p = m_view->painterFactory()->painter();
    if( drawVObjects )
    {
        p->begin();
        p->clear( TQColor( 195, 194, 193 ) );
        p->setZoomFactor( m_view->zoom() );
        setYMirroring( p );
        // TRICK : slightly adjust the matrix so libart AA looks better
        TQWMatrix mat = p->worldMatrix();
        p->setWorldMatrix( mat.translate( -.5, -.5 ) );
 
        m_part->document().drawPage( p, m_part->pageLayout(), m_view->showPageMargins() );
        KoRect r2 = boundingBox();
        m_part->document().draw( p, &r2 );
 
        p->end();
    }
 
    // draw handle:
    VTQPainter qpainter( p->device() );
    setYMirroring( &qpainter );
    qpainter.setZoomFactor( m_view->zoom() );
    m_part->document().selection()->draw( &qpainter, m_view->zoom() );
 
    if( m_view->toolController()->currentTool() )
        m_view->toolController()->currentTool()->draw( &qpainter );
 
    bitBlt( viewport(), 0, 0, p->device(), 0, 0, width(), height() );
}
 
void
VCanvas::repaintAll( bool drawVObjects )
{
    drawDocument( 0, KoRect( 0, 0, width(), height() ), drawVObjects );
}

void
VCanvas::repaintAll( const KoRect &r )
{
    drawDocument( 0, r );
}
 
void
VCanvas::resizeEvent( TQResizeEvent* event )
{
    double centerX = double( contentsX() + 0.5 * visibleWidth() ) / double( contentsWidth() );
    double centerY = double( contentsY() + 0.5 * visibleHeight() ) / double( contentsHeight() );
 
    TQScrollView::resizeEvent( event );
    if( !m_pixmap )
        m_pixmap = new TQPixmap( width(), height() );
    else
        m_pixmap->resize( width(), height() );
 
    VPainter *p = m_view->painterFactory()->painter();
    p->resize( width(), height() );
    p->clear( TQColor( 195, 194, 193 ) );
    setViewport( centerX, centerY );
}
 
void
VCanvas::slotContentsMoving( int /*x*/, int /*y*/ )
{
    emit viewportChanged();
}
 
void
VCanvas::dragEnterEvent( TQDragEnterEvent *e )
{
    e->accept( KarbonDrag::canDecode( e ) || KColorDrag::canDecode( e ) );
}
 
void
VCanvas::dropEvent( TQDropEvent *e )
{
    m_view->dropEvent( e );
}
 
#include "vcanvas.moc"