kdganttgraphicsview.cpp

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/****************************************************************************
** Copyright (C) 2001-2012 Klaralvdalens Datakonsult AB.  All rights reserved.
**
** This file is part of the KD Chart library.
**
** Licensees holding valid commercial KD Chart licenses may use this file in
** accordance with the KD Chart Commercial License Agreement provided with
** the Software.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 and version 3 as published by the
** Free Software Foundation and appearing in the file LICENSE.GPL.txt included.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Contact info@kdab.com if any conditions of this licensing are not
** clear to you.
**
**********************************************************************/

#include "kdganttgraphicsview.h"
#include "kdganttgraphicsview_p.h"
#include "kdganttabstractrowcontroller.h"
#include "kdganttgraphicsitem.h"
#include "kdganttconstraintmodel.h"

#include <QMenu>
#include <QPainter>
#include <QPaintEvent>
#include <QResizeEvent>
#include <QScrollBar>
#include <QAbstractProxyModel>

#include <cassert>

#if defined KDAB_EVAL
#include "../evaldialog/evaldialog.h"
#endif

using namespace KDGantt;

HeaderWidget::HeaderWidget( GraphicsView* parent )
    : QWidget( parent ), m_offset( 0. )
{
    assert( parent ); // Parent must be set
}

HeaderWidget::~HeaderWidget()
{
}

void HeaderWidget::scrollTo( int v )
{
    m_offset = v;
    // QWidget::scroll() wont work properly for me on Mac
    //scroll( static_cast<int>( old-v ), 0 );
    update();
}

void HeaderWidget::paintEvent( QPaintEvent* ev )
{
    QPainter p( this );
    view()->grid()->paintHeader( &p, rect(), ev->rect(), m_offset, this );
}

bool HeaderWidget::event( QEvent* event )
{
    if ( event->type() == QEvent::ToolTip ) {
        DateTimeGrid* const grid = qobject_cast< DateTimeGrid* >( view()->grid() );
        if ( grid ) {
            QHelpEvent *e = static_cast<QHelpEvent*>( event );
            QDateTime dt = grid->mapFromChart( view()->mapToScene( e->x(), 0 ).x() ).toDateTime();
            setToolTip( dt.toString() );
        }
    }
    return QWidget::event( event );
}

void HeaderWidget::contextMenuEvent( QContextMenuEvent* event )
{
    QMenu contextMenu;

    DateTimeGrid* const grid = qobject_cast< DateTimeGrid* >( view()->grid() );
    QAction* actionScaleAuto = 0;
    QAction* actionScaleMonth = 0;
    QAction* actionScaleWeek = 0;
    QAction* actionScaleDay = 0;
    QAction* actionScaleHour = 0;
    QAction* actionZoomIn = 0;
    QAction* actionZoomOut = 0;
    if( grid != 0 )
    {
        QMenu* menuScale = new QMenu( tr( "Scale" ), &contextMenu );
        QActionGroup* scaleGroup = new QActionGroup( &contextMenu );
        scaleGroup->setExclusive( true );

        actionScaleAuto = new QAction( tr( "Auto" ), menuScale );
        actionScaleAuto->setCheckable( true );
        actionScaleAuto->setChecked( grid->scale() == DateTimeGrid::ScaleAuto );
        actionScaleMonth = new QAction( tr( "Month" ), menuScale );
        actionScaleMonth->setCheckable( true );
        actionScaleMonth->setChecked( grid->scale() == DateTimeGrid::ScaleMonth );
        actionScaleWeek = new QAction( tr( "Week" ), menuScale );
        actionScaleWeek->setCheckable( true );
        actionScaleWeek->setChecked( grid->scale() == DateTimeGrid::ScaleWeek );
        actionScaleDay = new QAction( tr( "Day" ), menuScale );
        actionScaleDay->setCheckable( true );
        actionScaleDay->setChecked( grid->scale() == DateTimeGrid::ScaleDay );
        actionScaleHour = new QAction( tr( "Hour" ), menuScale );
        actionScaleHour->setCheckable( true );
        actionScaleHour->setChecked( grid->scale() == DateTimeGrid::ScaleHour );

        scaleGroup->addAction( actionScaleAuto );
        menuScale->addAction( actionScaleAuto );

        scaleGroup->addAction( actionScaleMonth );
        menuScale->addAction( actionScaleMonth );

        scaleGroup->addAction( actionScaleWeek );
        menuScale->addAction( actionScaleWeek );

        scaleGroup->addAction( actionScaleDay );
        menuScale->addAction( actionScaleDay );

        scaleGroup->addAction( actionScaleHour );
        menuScale->addAction( actionScaleHour );

        contextMenu.addMenu( menuScale );

        contextMenu.addSeparator();

        actionZoomIn = new QAction( tr( "Zoom In" ), &contextMenu );
        contextMenu.addAction( actionZoomIn );
        actionZoomOut = new QAction( tr( "Zoom Out" ), &contextMenu );
        contextMenu.addAction( actionZoomOut );
    }

    if( contextMenu.isEmpty() )
    {
        event->ignore();
        return;
    }

    const QAction* const action = contextMenu.exec( event->globalPos() );
    if( action == 0 ) {}
    else if( action == actionScaleAuto )
    {
        assert( grid != 0 );
        grid->setScale( DateTimeGrid::ScaleAuto );
    }
    else if( action == actionScaleMonth )
    {
        assert( grid != 0 );
        grid->setScale( DateTimeGrid::ScaleMonth );
    }
    else if( action == actionScaleWeek )
    {
        assert( grid != 0 );
        grid->setScale( DateTimeGrid::ScaleWeek );
    }
    else if( action == actionScaleDay )
    {
        assert( grid != 0 );
        grid->setScale( DateTimeGrid::ScaleDay );
    }
    else if( action == actionScaleHour )
    {
        assert( grid != 0 );
        grid->setScale( DateTimeGrid::ScaleHour );
    }
    else if( action == actionZoomIn )
    {
        assert( grid != 0 );
        grid->setDayWidth( grid->dayWidth() + 10.0 );
    }
    else if( action == actionZoomOut )
    {
        assert( grid != 0 );
        grid->setDayWidth( grid->dayWidth() - 10.0 );
    }

    event->accept();
}

GraphicsView::Private::Private( GraphicsView* _q )
  : q( _q ), rowcontroller(0), headerwidget( _q )
{
}

void GraphicsView::Private::updateHeaderGeometry()
{
    q->setViewportMargins(0,rowcontroller->headerHeight(),0,0);
    headerwidget.setGeometry( q->viewport()->x(),
                              q->viewport()->y() - rowcontroller->headerHeight(),
                              q->viewport()->width(),
                              rowcontroller->headerHeight() );
}

void GraphicsView::Private::slotGridChanged()
{
    updateHeaderGeometry();
    headerwidget.update();
    q->updateSceneRect();
    q->update();
}

void GraphicsView::Private::slotHorizontalScrollValueChanged( int val )
{
#if QT_VERSION >= 0x040300
    const QRectF viewRect = q->transform().mapRect( q->sceneRect() );
#else
    const QRectF viewRect = q->sceneRect();
#endif
    headerwidget.scrollTo( val-q->horizontalScrollBar()->minimum()+static_cast<int>( viewRect.left() ) );
}

void GraphicsView::Private::slotColumnsInserted( const QModelIndex& parent,  int start, int end )
{
    Q_UNUSED( start );
    Q_UNUSED( end );
    QModelIndex idx = scene.model()->index( 0, 0, scene.summaryHandlingModel()->mapToSource( parent ) );
    do {
        scene.updateRow( scene.summaryHandlingModel()->mapFromSource( idx ) );
    } while ( ( idx = rowcontroller->indexBelow( idx ) ) != QModelIndex() && rowcontroller->isRowVisible( idx ) );
        //} while ( ( idx = d->treeview.indexBelow( idx ) ) != QModelIndex() && d->treeview.visualRect(idx).isValid() );
     q->updateSceneRect();
}

void GraphicsView::Private::slotColumnsRemoved( const QModelIndex& parent,  int start, int end )
{
    // TODO
    Q_UNUSED( start );
    Q_UNUSED( end );
    Q_UNUSED( parent );
    q->updateScene();
}

void GraphicsView::Private::slotDataChanged( const QModelIndex& topLeft, const QModelIndex& bottomRight )
{
    //qDebug() << "GraphicsView::slotDataChanged("<<topLeft<<bottomRight<<")";
    const QModelIndex parent = topLeft.parent();
    for ( int row = topLeft.row(); row <= bottomRight.row(); ++row ) {
        scene.updateRow( scene.summaryHandlingModel()->index( row, 0, parent ) );
    }
}

void GraphicsView::Private::slotLayoutChanged()
{
    //qDebug() << "slotLayoutChanged()";
    q->updateScene();
}

void GraphicsView::Private::slotModelReset()
{
    //qDebug() << "slotModelReset()";
    q->updateScene();
}

void GraphicsView::Private::slotRowsInserted( const QModelIndex& parent,  int start, int end )
{
    Q_UNUSED( parent );
    Q_UNUSED( start );
    Q_UNUSED( end );
    q->updateScene(); // TODO: This might be optimised
}

void GraphicsView::Private::slotRowsAboutToBeRemoved( const QModelIndex& parent,  int start, int end )
{
    //qDebug() << "GraphicsView::Private::slotRowsAboutToBeRemoved("<<parent<<start<<end<<")";
    for ( int row = start; row <= end; ++row ) {
        for ( int col = 0; col < scene.summaryHandlingModel()->columnCount( parent ); ++col ) {
            //qDebug() << "removing "<<scene.summaryHandlingModel()->index( row, col, parent );
            scene.removeItem( scene.summaryHandlingModel()->index( row, col, parent ) );
        }
    }
}

void GraphicsView::Private::slotRowsRemoved( const QModelIndex& parent,  int start, int end )
{
    //qDebug() << "GraphicsView::Private::slotRowsRemoved("<<parent<<start<<end<<")";
    // TODO
    Q_UNUSED( parent );
    Q_UNUSED( start );
    Q_UNUSED( end );

    q->updateScene();
}

void GraphicsView::Private::slotItemClicked( const QModelIndex& idx )
{
    QModelIndex sidx = idx;//scene.summaryHandlingModel()->mapToSource( idx );
    emit q->clicked( sidx );
    if (q->style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, 0, q))
        emit q->activated( sidx );
}

void GraphicsView::Private::slotItemDoubleClicked( const QModelIndex& idx )
{
    QModelIndex sidx = idx;//scene.summaryHandlingModel()->mapToSource( idx );
    emit q->doubleClicked( sidx );
    if (!q->style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, 0, q))
        emit q->activated( sidx );
}

void GraphicsView::Private::slotHeaderContextMenuRequested( const QPoint& pt )
{
    emit q->headerContextMenuRequested( headerwidget.mapToGlobal( pt ) );
}

GraphicsView::GraphicsView( QWidget* parent )
    : QGraphicsView( parent ), _d( new Private( this ) )
{

#if defined KDAB_EVAL
  EvalDialog::checkEvalLicense( "KD Gantt" );
#endif
    connect( horizontalScrollBar(), SIGNAL( valueChanged( int ) ),
             this, SLOT( slotHorizontalScrollValueChanged( int ) ) );
    connect( &_d->scene, SIGNAL( gridChanged() ),
             this, SLOT( slotGridChanged() ) );
    connect( &_d->scene, SIGNAL( entered( const QModelIndex& ) ),
             this, SIGNAL( entered( const QModelIndex& ) ) );
    connect( &_d->scene, SIGNAL( pressed( const QModelIndex& ) ),
             this, SIGNAL( pressed( const QModelIndex& ) ) );
    connect( &_d->scene, SIGNAL( clicked( const QModelIndex& ) ),
             this, SLOT( slotItemClicked( const QModelIndex& ) ) );
    connect( &_d->scene, SIGNAL( doubleClicked( const QModelIndex& ) ),
             this, SLOT( slotItemDoubleClicked( const QModelIndex& ) ) );
    connect( &_d->scene, SIGNAL( sceneRectChanged( const QRectF& ) ),
             this, SLOT( updateSceneRect() ) );
    connect( &_d->headerwidget, SIGNAL( customContextMenuRequested( const QPoint& ) ),
             this, SLOT( slotHeaderContextMenuRequested( const QPoint& ) ) );
    setScene( &_d->scene );

    // HACK!
    setSummaryHandlingModel( _d->scene.summaryHandlingModel() );

    // So that AbstractGrid::drawBackground() and AbstractGrid::drawForeground() 
    // works properly
    setViewportUpdateMode(QGraphicsView::FullViewportUpdate);

    //setCacheMode( CacheBackground );
}

GraphicsView::~GraphicsView()
{
    delete _d;
}

#define d d_func()

void GraphicsView::setModel( QAbstractItemModel* model )
{
    if ( d->scene.model() ) {
        disconnect( d->scene.model() );
    }

    d->scene.setModel( model );
    connect( model, SIGNAL( dataChanged(  const QModelIndex&, const QModelIndex& ) ),
             this, SLOT( updateSceneRect() ) );
    updateScene();
}

QAbstractItemModel* GraphicsView::model() const
{
    return d->scene.model();
}

void GraphicsView::setSummaryHandlingModel( QAbstractProxyModel* proxyModel )
{
    disconnect( d->scene.summaryHandlingModel() );
    d->scene.setSummaryHandlingModel( proxyModel );

    /* Connections. We have to rely on the treeview
     * to receive the signals before we do(!)
     */
    connect( proxyModel, SIGNAL( columnsInserted( const QModelIndex&, int, int ) ),
             this,  SLOT( slotColumnsInserted( const QModelIndex&,  int, int ) ) );
    connect( proxyModel, SIGNAL( columnsRemoved( const QModelIndex&, int, int ) ),
             this,  SLOT( slotColumnsRemoved( const QModelIndex&,  int, int ) ) );
    connect( proxyModel, SIGNAL( dataChanged( const QModelIndex&, const QModelIndex& ) ),
             this,  SLOT( slotDataChanged( const QModelIndex&, const QModelIndex& ) ) );
    connect( proxyModel, SIGNAL( layoutChanged() ),
             this,  SLOT( slotLayoutChanged() ) );
    connect( proxyModel, SIGNAL( modelReset() ),
             this,  SLOT( slotModelReset() ) );
    connect( proxyModel, SIGNAL( rowsInserted( const QModelIndex&, int, int ) ),
             this,  SLOT( slotRowsInserted( const QModelIndex&,  int, int ) ) );
    connect( proxyModel, SIGNAL( rowsAboutToBeRemoved( const QModelIndex&, int, int ) ),
             this,  SLOT( slotRowsAboutToBeRemoved( const QModelIndex&,  int, int ) ) );
    connect( proxyModel, SIGNAL( rowsRemoved( const QModelIndex&, int, int ) ),
             this,  SLOT( slotRowsRemoved( const QModelIndex&,  int, int ) ) );

    updateScene();
}

void GraphicsView::setConstraintModel( ConstraintModel* cmodel )
{
    d->scene.setConstraintModel( cmodel );
}

ConstraintModel* GraphicsView::constraintModel() const
{
    return d->scene.constraintModel();
}

QAbstractProxyModel* GraphicsView::summaryHandlingModel() const
{
    return d->scene.summaryHandlingModel();
}

void GraphicsView::setRootIndex( const QModelIndex& idx )
{
    d->scene.setRootIndex( idx );
}

QModelIndex GraphicsView::rootIndex() const
{
    return d->scene.rootIndex();
}

void GraphicsView::setSelectionModel( QItemSelectionModel* model )
{
    d->scene.setSelectionModel( model );
}

QItemSelectionModel* GraphicsView::selectionModel() const
{
    return d->scene.selectionModel();
}

void GraphicsView::setItemDelegate( ItemDelegate* delegate )
{
    d->scene.setItemDelegate( delegate );
}

ItemDelegate* GraphicsView::itemDelegate() const
{
    return d->scene.itemDelegate();
}

void GraphicsView::setRowController( AbstractRowController* rowcontroller )
{
    d->rowcontroller = rowcontroller;
    d->scene.setRowController( rowcontroller );
    updateScene();
}

AbstractRowController* GraphicsView::rowController() const
{
    return d->rowcontroller;
}

void GraphicsView::setGrid( AbstractGrid* grid )
{
    d->scene.setGrid( grid );
    d->slotGridChanged();
}

AbstractGrid* GraphicsView::grid() const
{
    return d->scene.grid();
}

void GraphicsView::setReadOnly( bool ro )
{
    d->scene.setReadOnly( ro );
}

bool GraphicsView::isReadOnly() const
{
    return d->scene.isReadOnly();
}

void GraphicsView::setHeaderContextMenuPolicy( Qt::ContextMenuPolicy p )
{
    d->headerwidget.setContextMenuPolicy( p );
}

Qt::ContextMenuPolicy GraphicsView::headerContextMenuPolicy() const
{
    return d->headerwidget.contextMenuPolicy();
}

void GraphicsView::addConstraint( const QModelIndex& from,
                                  const QModelIndex& to,
                                  Qt::KeyboardModifiers modifiers )
{
    if ( isReadOnly() ) return;
    ConstraintModel* cmodel = constraintModel();
    assert( cmodel );
    Constraint c( from, to, ( modifiers&Qt::ShiftModifier )?Constraint::TypeHard:Constraint::TypeSoft );
    if ( cmodel->hasConstraint( c ) ) cmodel->removeConstraint( c );
    else cmodel->addConstraint( c );
}

void GraphicsView::resizeEvent( QResizeEvent* ev )
{
    d->updateHeaderGeometry();
    QRectF r = scene()->itemsBoundingRect();
    // To scroll more to the left than the actual item start, bug #4516
    r.setLeft( qMin( qreal(0.0), r.left() ) );
    // TODO: take scrollbars into account (if not always on)
    // The scene should be at least the size of the viewport
    QSizeF size = viewport()->size();
    //TODO: why -2 below? size should be ex. frames etc?
    if ( size.width() > r.width() ) {
        r.setWidth( size.width() - 2 );
    }
    if ( size.height() > r.height() ) {
        r.setHeight( size.height() - 2 );
    }
    const int totalh = rowController()->totalHeight();
    if ( r.height() < totalh ) {
        r.setHeight( totalh );
    }

    scene()->setSceneRect( r );

    QGraphicsView::resizeEvent( ev );
}

QModelIndex GraphicsView::indexAt( const QPoint& pos ) const
{
    QGraphicsItem* item = itemAt( pos );
    if ( GraphicsItem* gitem = qgraphicsitem_cast<GraphicsItem*>( item ) ) {
        return d->scene.summaryHandlingModel()->mapToSource( gitem->index() );
    } else {
        return QModelIndex();
    }
}

void GraphicsView::clearItems()
{
    d->scene.clearItems();
}

void GraphicsView::updateRow( const QModelIndex& idx )
{
    d->scene.updateRow( d->scene.summaryHandlingModel()->mapFromSource( idx ) );
}

void GraphicsView::updateSceneRect()
{
    /* What to do with this? We need to shrink the view to
     * make collapsing items work
     */
    qreal range = horizontalScrollBar()->maximum()-horizontalScrollBar()->minimum();
    const qreal hscroll = horizontalScrollBar()->value()/( range>0?range:1 );
    QRectF r = d->scene.itemsBoundingRect();
    // To scroll more to the left than the actual item start, bug #4516
    r.setTop( 0. );
    r.setLeft( qMin( qreal(0.0), r.left() ) );
    r.setSize( r.size().expandedTo( viewport()->size() ) );
    const int totalh = rowController()->totalHeight();
    if ( r.height() < totalh ) r.setHeight( totalh );
    d->scene.setSceneRect( r );

    /* set scrollbar to keep the same time in view */
    range = horizontalScrollBar()->maximum()-horizontalScrollBar()->minimum();
    if ( range>0 ) horizontalScrollBar()->setValue( qRound( hscroll*range ) );

    /* We have to update here to adjust for any rows with no
     * information because they are painted with a different
     * background brush
     */
    d->scene.invalidate( QRectF(), QGraphicsScene::BackgroundLayer );
}

void GraphicsView::updateScene()
{
    clearItems();
    if( !model()) return;
    if( !rowController()) return;
    QModelIndex idx = model()->index( 0, 0, rootIndex() );
    do {
        updateRow( idx );
    } while ( ( idx = rowController()->indexBelow( idx ) ) != QModelIndex() && rowController()->isRowVisible(idx) );
    //constraintModel()->cleanup();
    //qDebug() << constraintModel();
    updateSceneRect();
    if ( scene() ) scene()->invalidate( QRectF(), QGraphicsScene::BackgroundLayer );
}

GraphicsItem* GraphicsView::createItem( ItemType type ) const
{
    return d->scene.createItem( type );
}

void GraphicsView::deleteSubtree( const QModelIndex& idx )
{
    d->scene.deleteSubtree( d->scene.summaryHandlingModel()->mapFromSource( idx ) );
}

void GraphicsView::print( QPrinter* printer, bool drawRowLabels )
{
    d->scene.print( printer, drawRowLabels );
}

void GraphicsView::print( QPrinter* printer,  qreal start, qreal end, bool drawRowLabels )
{
    d->scene.print( printer, start, end, drawRowLabels );
}

void GraphicsView::print( QPainter* painter, const QRectF& targetRect, bool drawRowLabels )
{
  d->scene.print(painter,targetRect,drawRowLabels);
}

void GraphicsView::print( QPainter* painter, qreal start, qreal end,
                          const QRectF& targetRect, bool drawRowLabels )
{
  d->scene.print(painter, start, end, targetRect, drawRowLabels);
}


#include "moc_kdganttgraphicsview.cpp"