vgradienttool.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 <tqlabel.h>
 
#include <tdelocale.h>
 
#include <karbon_part.h>
#include <karbon_view.h>
#include <karbon_factory.h>
#include <render/vpainter.h>
#include <render/vpainterfactory.h>
#include "vgradienttool.h"
#include <widgets/vgradienttabwidget.h>
#include <commands/vfillcmd.h>
#include <commands/vstrokecmd.h>
#include <core/vstroke.h>
#include <core/vselection.h>
#include <widgets/vstrokefillpreview.h>
 
#include <kdebug.h>
 
VGradientTool::VGradientOptionsWidget::VGradientOptionsWidget( VGradient& gradient )
    : KDialogBase( 0L, "", true, i18n( "Edit Gradient" ), Ok | Cancel )
{
    m_gradientWidget = new VGradientTabWidget( gradient, KarbonFactory::rServer(), this );
    setMainWidget( m_gradientWidget );
    setFixedSize( baseSize() );
}
 
VGradientTool::VGradientTool( KarbonView *view )
    : VTool( view, "gradienttool" ), m_state( normal ), m_handleSize( 3 ), m_active( false )
{
    setName( "tool_gradient" );
    m_optionsWidget = new VGradientOptionsWidget( m_gradient );
    registerTool( this );
}
 
VGradientTool::~VGradientTool()
{
    delete m_optionsWidget;
}
 
void
VGradientTool::activate()
{
    m_active = true;
    m_state = normal;
    view()->statusMessage()->setText( i18n( "Gradient" ) );
    view()->setCursor( TQCursor( TQt::crossCursor ) );
    VTool::activate();
 
    if( view() )
    {
        // disable selection handles
        view()->part()->document().selection()->showHandle( false );
        // connect to the stroke-fill-preview to get notice when the stroke or fill gets selected
        VStrokeFillPreview* preview = view()->strokeFillPreview();
        if( preview )
        {
            connect( preview, TQ_SIGNAL( fillSelected() ), this, TQ_SLOT( targetChanged() ) );
            connect( preview, TQ_SIGNAL( strokeSelected() ), this, TQ_SLOT( targetChanged() ) );
        }
        view()->repaintAll( view()->part()->document().selection()->boundingBox() );
    }
}
 
void
VGradientTool::deactivate()
{
    m_active = false;
 
    if( view() )
    {
        // enable selection handles
        view()->part()->document().selection()->showHandle( true );
        VStrokeFillPreview* preview = view()->strokeFillPreview();
        if( preview )
        {
            disconnect( preview, TQ_SIGNAL( fillSelected() ), this, TQ_SLOT( targetChanged() ) );
            disconnect( preview, TQ_SIGNAL( strokeSelected() ), this, TQ_SLOT( targetChanged() ) );
        }
        view()->repaintAll( view()->part()->document().selection()->boundingBox() );
    }
}
 
TQString
VGradientTool::statusText()
{
    return i18n( "Gradient Tool" );
}
 
TQString 
VGradientTool::contextHelp()
{
    TQString s = i18n( "<qt><b>Gradient tool:</b><br>" );
    s += i18n( "<i>Click and drag</i> to choose the gradient vector.<br>" );
    s += i18n( "<i>Click and drag</i> a gradient vector handle to change the gradient vector.<br>" );
    s += i18n( "<i>Shift click and drag</i> to move the radial gradient focal point.<br>" );
    s += i18n( "<i>Press i or Shift+i</i> to decrease or increase the handle size.<br>" );
    s += i18n( "<br><b>Gradient editing:</b><br>" );
    s += i18n( "<i>Click and drag</i> to move points.<br>" );
    s += i18n( "<i>Double click</i> on a color point to edit it.<br>" );
    s += i18n( "<i>Right click</i> on a color point to remove it.</qt>" );
    return s;
}
 
bool 
VGradientTool::getGradient( VGradient &gradient )
{
    if( ! view() ) 
        return false;
    
    // determine if stroke of fill is selected for editing
    VStrokeFillPreview *preview = view()->strokeFillPreview();
    bool strokeSelected = ( preview && preview->strokeIsSelected() );
        
    VSelection* selection = view()->part()->document().selection();
    if( selection->objects().count() != 1 ) 
        return false;
    
    VObject *obj = selection->objects().getFirst();
    // get the gradient of the first selected object, if any
    if( strokeSelected && obj->stroke()->type() == VStroke::grad )
        gradient = obj->stroke()->gradient();
    else if( ! strokeSelected && obj->fill()->type() == VFill::grad )
        gradient = obj->fill()->gradient();
    else
        return false;
    
    return true;
}
 
bool
VGradientTool::getOpacity( double &opacity )
{
    if( ! view() ) 
        return false;
    
    // determine if stroke of fill is selected for editing
    VStrokeFillPreview *preview = view()->strokeFillPreview();
    bool strokeSelected = ( preview && preview->strokeIsSelected() );
        
    VSelection* selection = view()->part()->document().selection();
    if( selection->objects().count() != 1 ) 
        return false;
    
    VObject *obj = selection->objects().getFirst();
    // get the opacity of the first selected object, if any
    if( strokeSelected && obj->stroke()->type() == VStroke::grad )
        opacity = obj->stroke()->color().opacity();
    else if( ! strokeSelected && obj->fill()->type() == VFill::grad )
        opacity = obj->fill()->color().opacity();
    else return false;
    
    return true;
}
 
void 
VGradientTool::draw( VPainter* painter )
{
    if( ! m_active )
        return;
 
    if( m_state != normal )
        return;
 
    if( ! getGradient( m_gradient ) )
        return;
 
    KoPoint s = m_gradient.origin();
    KoPoint e = m_gradient.vector();
    KoPoint f = m_gradient.focalPoint();
 
    // save the handle rects for later inside testing
    m_origin = KoRect( s.x()-m_handleSize, s.y()-m_handleSize, 2*m_handleSize, 2*m_handleSize );
    m_vector = KoRect( e.x()-m_handleSize, e.y()-m_handleSize, 2*m_handleSize, 2*m_handleSize );
    m_center = KoRect( f.x()-m_handleSize, f.y()-m_handleSize, 2*m_handleSize, 2*m_handleSize );
 
    painter->setPen( TQt::blue.light() );
    painter->setBrush( TQt::blue.light() );
    painter->setRasterOp( TQt::XorROP );
 
    // draw the gradient vector
    painter->newPath();
    painter->moveTo( s );
    painter->lineTo( e );
    painter->strokePath();
    
    if( m_gradient.type() == VGradient::radial )
    {
        // draw the focal point cross
        double size = (double)m_handleSize / view()->zoom();
        KoPoint focal = m_center.center();
        KoRect cross = KoRect( focal.x()-3*size, focal.y()-3*size, 6*size, 6*size );
        painter->newPath();
        painter->moveTo( cross.topLeft() );
        painter->lineTo( cross.bottomRight() );
        painter->strokePath();
        painter->newPath();
        painter->moveTo( cross.bottomLeft() );
        painter->lineTo( cross.topRight() );
        painter->strokePath();
    }
    // draw the handle rects
    painter->drawNode( m_origin.center(), m_handleSize );
    painter->drawNode( m_vector.center(), m_handleSize );
}
 
void
VGradientTool::draw()
{
    if( ! view() || view()->part()->document().selection()->objects().count() == 0 )
        return;
 
    VPainter *painter = view()->painterFactory()->editpainter();
    painter->setRasterOp( TQt::NotROP );
 
    painter->setPen( TQt::DotLine );
    painter->newPath();
    
    // differentiate between moving a handle and creating a complete new vector
    if( m_state == moveOrigin || m_state == moveVector )
    {
        painter->moveTo( m_fixed );
        painter->lineTo( m_current );
        // draw the handle rects
        painter->drawNode( m_fixed, m_handleSize );
        painter->drawNode( m_current, m_handleSize );
    }
    else if( m_state == createNew )
    {
        painter->moveTo( first() );
        painter->lineTo( m_current );
        // draw the handle rects
        painter->drawNode( first(), m_handleSize );
        painter->drawNode( m_current, m_handleSize );
    }
    else if( m_state == moveCenter )
    {
        // draw the focal point cross
        double size = (double)m_handleSize / view()->zoom();
        KoRect cross = KoRect( m_current.x()-3*size, m_current.y()-3*size, 6*size, 6*size );
        painter->moveTo( cross.topLeft() );
        painter->lineTo( cross.bottomRight() );
        painter->strokePath();
        painter->newPath();
        painter->moveTo( cross.bottomLeft() );
        painter->lineTo( cross.topRight() );
    }
 
    painter->strokePath();
}
 
void
VGradientTool::mouseDrag()
{
    if( m_state == normal ) 
        return;
 
    // undo old line
    draw();
 
    m_current = last();
 
    draw();
}
 
void
VGradientTool::mouseButtonPress()
{
    m_current = first();
 
    // set the apropriate editing state
    if( m_center.contains( m_current ) && shiftPressed())
    {
        m_state = moveCenter;
    }
    else if( m_origin.contains( m_current ) )
    {
        m_state = moveOrigin;
        m_fixed = m_vector.center();
    }
    else if( m_vector.contains( m_current ) )
    {
        m_state = moveVector;
        m_fixed = m_origin.center();
    }
    else 
        m_state = createNew;
}
 
void
VGradientTool::mouseButtonRelease()
{
    m_state = normal;
 
    if( ! view() || view()->part()->document().selection()->objects().count() == 0 ) 
        return;
 
    // save old gradient position
    VGradient oldGradient = m_gradient;
 
    bool strokeSelected = false;
 
    // determine the target from the stroke-fill-preview-widget
    VStrokeFillPreview* preview = view()->strokeFillPreview();
    if( preview && preview->strokeIsSelected() )
        strokeSelected = true;
 
    if( first() == last() )
    {
        m_optionsWidget->gradientWidget()->setGradient( m_gradient );
        if( strokeSelected )
        {
            m_optionsWidget->gradientWidget()->setTarget( VGradientTabWidget::STROKE );
            m_optionsWidget->gradientWidget()->setOpacity( 1.0 );
        }
        else
        {
            m_optionsWidget->gradientWidget()->setTarget( VGradientTabWidget::FILL );
            double opacity;
            if( getOpacity( opacity ) )
                m_optionsWidget->gradientWidget()->setOpacity( opacity );
        }
        
        if( ! showDialog() )
            return;
        
        m_gradient = m_optionsWidget->gradientWidget()->gradient();
 
        // if the gradient dialog was shown and accepted, determine the target from the dialog
        strokeSelected = ( m_optionsWidget->gradientWidget()->target() == VGradientTabWidget::STROKE );
    }
 
    // calculate a sane intial position for the new gradient
    if( view()->part()->document().selection()->objects().count() == 1 )
    {
        VObject *obj = view()->part()->document().selection()->objects().getFirst();
 
        if( ( ! strokeSelected && obj->fill()->type() != VFill::grad ) 
        || ( strokeSelected && obj->stroke()->type() != VStroke::grad ) )
        {
            KoRect bbox = obj->boundingBox();
            switch( m_gradient.type() )
            {
                case VGradient::linear:
                    oldGradient.setOrigin( bbox.bottomLeft() + 0.5*(bbox.bottomRight()-bbox.bottomLeft()) );
                    oldGradient.setVector( bbox.topLeft() + 0.5*(bbox.topRight()-bbox.topLeft()) );
                    oldGradient.setFocalPoint( bbox.center() );
                break;
                case VGradient::radial:
                    oldGradient.setOrigin( bbox.center() );
                    oldGradient.setVector( bbox.topLeft() + 0.5*(bbox.topRight()-bbox.topLeft()) );
                    oldGradient.setFocalPoint( bbox.center() );
                break;
                case VGradient::conic:
                    oldGradient.setOrigin( bbox.center() );
                    oldGradient.setVector( bbox.topLeft() + 0.5*(bbox.topRight()-bbox.topLeft()) );
                    oldGradient.setFocalPoint( bbox.center() );
                break;
            }
        }
    }
 
    // workaround for a libart 2.3.10 bug
    if( oldGradient.origin() == oldGradient.vector() )
        oldGradient.vector().rx()+=1;
 
    // use the old gradient position
    m_gradient.setVector( oldGradient.vector() );
    m_gradient.setOrigin( oldGradient.origin() );
    m_gradient.setFocalPoint( oldGradient.focalPoint() );
 
    if( ! strokeSelected )
    {
        VFill fill;
        fill.gradient() = m_gradient;
        fill.setType( VFill::grad );
        VColor c = fill.color();
        c.setOpacity( m_optionsWidget->gradientWidget()->opacity() );
        fill.setColor( c, false );
        view()->part()->addCommand(
            new VFillCmd( &view()->part()->document(), fill, "14_gradient" ), true );
    }
    else
    {
        view()->part()->addCommand(
            new VStrokeCmd( &view()->part()->document(), &m_gradient ), true );
    }
}
 
void
VGradientTool::mouseDragRelease()
{
    if( ! view() || m_state == normal ) 
        return;
 
    if( view()->part()->document().selection()->objects().count() == 0 )
    {
        draw();
        return;
    }
 
    if( m_state == moveOrigin )
        m_gradient.setOrigin( last() );
    else if( m_state == moveVector )
        m_gradient.setVector( last() );
    else if( m_state == moveCenter )
        m_gradient.setFocalPoint( last() );
    else if( m_state == createNew )
    {
        m_gradient.setOrigin( first() );
        m_gradient.setFocalPoint( first() );
        m_gradient.setVector( last() );
    }
 
    m_state = normal;
 
    VStrokeFillPreview* preview = view()->strokeFillPreview();
    if( ! preview )
        return;
 
    if( ! preview->strokeIsSelected() )
    {
        VFill fill;
        fill.gradient() = m_gradient;
        fill.setType( VFill::grad );
        VColor c = fill.color();
        c.setOpacity( m_optionsWidget->gradientWidget()->opacity() );
        fill.setColor( c, false );
        view()->part()->addCommand(
            new VFillCmd( &view()->part()->document(), fill, "14_gradient" ), true );
    }
    else
        view()->part()->addCommand(
            new VStrokeCmd( &view()->part()->document(), &m_gradient ), true );
}
 
void
VGradientTool::cancel()
{
    // Erase old object:
    if( isDragging() )
        draw();
    m_state = normal;
}
 
bool
VGradientTool::showDialog() const
{
    return m_optionsWidget->exec() == TQDialog::Accepted;
}
 
void
VGradientTool::setup( TDEActionCollection *collection )
{
    m_action = static_cast<TDERadioAction *>(collection -> action( name() ) );
 
    if( m_action == 0 )
    {
        m_action = new TDERadioAction( i18n( "Gradient Tool" ), "14_gradient", TQt::Key_G, this, TQ_SLOT( activate() ), collection, name() );
        m_action->setToolTip( i18n( "Gradient" ) );
        m_action->setExclusiveGroup( "misc" );
        //m_ownAction = true;
    }
}
 
void
VGradientTool::setCursor() const
{
    if( !view() ) return;
 
    // set a different cursor if mouse is inside the handle rects
    if( m_origin.contains( last() ) || m_vector.contains( last() ) || m_center.contains( last() ) )
        view()->setCursor( TQCursor( TQt::SizeAllCursor ) );
    else
        view()->setCursor( TQCursor( TQt::arrowCursor ) );
}
 
bool 
VGradientTool::keyReleased( TQt::Key key )
{
    // increase/decrease the handle size
    switch( key )
    {
        case TQt::Key_I:
            if( shiftPressed() ) 
                m_handleSize++;
            else if( m_handleSize > 3 )
                m_handleSize--;
        break;
        default: return false;
    }
 
    if( view() )
        view()->repaintAll( view()->part()->document().selection()->boundingBox() );
 
    return true;
}
 
void 
VGradientTool::targetChanged()
{
    if( view() ) 
        view()->repaintAll( view()->part()->document().selection()->boundingBox() );
}
 
#include "vgradienttool.moc"