File indexing completed on 2024-05-12 04:20:41

 /*
  * SPDX-FileCopyrightText: 2001-2015 Klaralvdalens Datakonsult AB. All rights reserved.
  *
  * This file is part of the KGantt library.
  *
  * SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include "kganttgraphicsitem.h"
 #include "kganttgraphicsscene.h"
 #include "kganttgraphicsview.h"
 #include "kganttitemdelegate.h"
 #include "kganttconstraintgraphicsitem.h"
 #include "kganttconstraintmodel.h"
 #include "kganttconstraint.h"
 #include "kganttabstractgrid.h"
 #include "kganttabstractrowcontroller.h"
 
 #include <cassert>
 #include <cmath>
 #include <algorithm>
 #include <iterator>
 
 #include <QPainter>
 #include <QAbstractItemModel>
 #include <QAbstractProxyModel>
 #include <QGraphicsSceneMouseEvent>
 #include <QGraphicsLineItem>
 #include <QApplication>
 
 #include <QDebug>
 
 
 
 using namespace KGantt;
 
 typedef QGraphicsItem BASE;
 
 namespace {
     class Updater {
         bool *u_ptr;
         bool oldval;
     public:
         Updater( bool* u ) : u_ptr( u ), oldval( *u ) {
             *u=true;
         }
         ~Updater() {
             *u_ptr = oldval;
         }
     };
 }
 
 GraphicsItem::GraphicsItem( QGraphicsItem* parent, GraphicsScene* scene )
     : BASE( parent ),  m_isupdating( false )
 {
   if ( scene )
     scene->addItem( this );
   init();
 }
 
 GraphicsItem::GraphicsItem( const QModelIndex& idx, QGraphicsItem* parent,
                                             GraphicsScene* scene )
     : BASE( parent ),  m_index( idx ), m_isupdating( false )
 {
   init();
   if ( scene )
     scene->addItem( this );
 }
 
 GraphicsItem::~GraphicsItem()
 {
 }
 
 void GraphicsItem::init()
 {
     setCacheMode( QGraphicsItem::DeviceCoordinateCache );
     setFlags( ItemIsMovable|ItemIsSelectable|ItemIsFocusable );
     setAcceptHoverEvents( true );
     setHandlesChildEvents( true );
     setZValue( 100. );
     m_dragline = nullptr;
 }
 
 int GraphicsItem::type() const
 {
     return Type;
 }
 
 StyleOptionGanttItem GraphicsItem::getStyleOption() const
 {
     StyleOptionGanttItem opt;
     if (!m_index.isValid()) {
         // TODO: find out why we get invalid indexes
         //qDebug()<<"GraphicsItem::getStyleOption: Invalid index";
         return opt;
     }
     opt.palette = QApplication::palette();
     opt.itemRect = rect();
     opt.boundingRect = boundingRect();
     QVariant tp = m_index.model()->data( m_index, TextPositionRole );
     if (tp.isValid()) {
         opt.displayPosition = static_cast<StyleOptionGanttItem::Position>(tp.toInt());
     } else {
 #if 0
         qDebug() << "Item" << m_index.model()->data( m_index, Qt::DisplayRole ).toString()
                  << ", ends="<<m_endConstraints.size() << ", starts="<<m_startConstraints.size();
 #endif
         opt.displayPosition = m_endConstraints.size()<m_startConstraints.size()?StyleOptionGanttItem::Left:StyleOptionGanttItem::Right;
 #if 0
         qDebug() << "choosing" << opt.displayPosition;
 #endif
     }
     QVariant da = m_index.model()->data( m_index, Qt::TextAlignmentRole );
     if ( da.isValid() ) {
         opt.displayAlignment = static_cast< Qt::Alignment >( da.toInt() );
     } else {
         switch ( opt.displayPosition ) {
         case StyleOptionGanttItem::Left: opt.displayAlignment = Qt::AlignLeft|Qt::AlignVCenter; break;
         case StyleOptionGanttItem::Right: opt.displayAlignment = Qt::AlignRight|Qt::AlignVCenter; break;
         case StyleOptionGanttItem::Hidden: // fall through
         case StyleOptionGanttItem::Center: opt.displayAlignment = Qt::AlignCenter; break;
         }
     }
     opt.grid = const_cast<AbstractGrid*>(scene()->getGrid());
     opt.text = m_index.model()->data( m_index, Qt::DisplayRole ).toString();
     if ( isEnabled() ) opt.state  |= QStyle::State_Enabled;
     if ( isSelected() ) opt.state |= QStyle::State_Selected;
     if ( hasFocus() ) opt.state   |= QStyle::State_HasFocus;
     return opt;
 }
 
 GraphicsScene* GraphicsItem::scene() const
 {
     return qobject_cast<GraphicsScene*>( QGraphicsItem::scene() );
 }
 
 void GraphicsItem::setRect( const QRectF& r )
 {
 #if 0
     qDebug() << "GraphicsItem::setRect("<<r<<"), txt="<<m_index.model()->data( m_index, Qt::DisplayRole ).toString();
     if ( m_index.model()->data( m_index, Qt::DisplayRole ).toString() == QLatin1String("Code Freeze" ) ) {
         qDebug() << "gotcha";
     }
 #endif
 
     prepareGeometryChange();
     m_rect = r;
     updateConstraintItems();
     update();
 }
 
 void GraphicsItem::setBoundingRect( const QRectF& r )
 {
     prepareGeometryChange();
     m_boundingrect = r;
     update();
 }
 
 bool GraphicsItem::isEditable() const
 {
     return !scene()->isReadOnly() && m_index.isValid() && m_index.model()->flags( m_index ) & Qt::ItemIsEditable;
 }
 
 void GraphicsItem::paint( QPainter* painter, const QStyleOptionGraphicsItem* option,
                                   QWidget* widget )
 {
     Q_UNUSED( widget );
     if ( boundingRect().isValid() && scene() ) {
         StyleOptionGanttItem opt = getStyleOption();
         *static_cast<QStyleOption*>(&opt) = *static_cast<const QStyleOption*>( option );
         //opt.fontMetrics = painter->fontMetrics();
         if (widget) {
             opt.palette = widget->palette();
         } else {
             opt.palette = QApplication::palette();
         }
         scene()->itemDelegate()->paintGanttItem( painter, opt, index() );
     }
 }
 
 void GraphicsItem::setIndex( const QPersistentModelIndex& idx )
 {
     m_index=idx;
     update();
 }
 
 QString GraphicsItem::ganttToolTip() const
 {
     return scene()->itemDelegate()->toolTip( index() );
 }
 
 QRectF GraphicsItem::boundingRect() const
 {
     return m_boundingrect;
 }
 
 QPointF GraphicsItem::startConnector( int relationType ) const
 {
     switch ( relationType ) {
         case Constraint::StartStart:
         case Constraint::StartFinish:
             return mapToScene( m_rect.left(), m_rect.top()+m_rect.height()/2. );
         default:
             break;
     }
     return mapToScene( m_rect.right(), m_rect.top()+m_rect.height()/2. );
 }
 
 QPointF GraphicsItem::endConnector( int relationType ) const
 {
     switch ( relationType ) {
         case Constraint::FinishFinish:
         case Constraint::StartFinish:
             return mapToScene( m_rect.right(), m_rect.top()+m_rect.height()/2. );
         default:
             break;
     }
     return mapToScene( m_rect.left(), m_rect.top()+m_rect.height()/2. );
 }
 
 
 void GraphicsItem::constraintsChanged()
 {
     if ( !scene() || !scene()->itemDelegate() ) return;
     const Span bs = scene()->itemDelegate()->itemBoundingSpan( getStyleOption(), index() );
     const QRectF br = boundingRect();
     setBoundingRect( QRectF( bs.start(), 0., bs.length(), br.height() ) );
 }
 
 void GraphicsItem::addStartConstraint( ConstraintGraphicsItem* item )
 {
     assert( item );
     m_startConstraints << item;
     item->setStart( startConnector( item->constraint().relationType() ) );
     constraintsChanged();
 }
 
 void GraphicsItem::addEndConstraint( ConstraintGraphicsItem* item )
 {
     assert( item );
     m_endConstraints << item;
     item->setEnd( endConnector( item->constraint().relationType() ) );
     constraintsChanged();
 }
 
 void GraphicsItem::removeStartConstraint( ConstraintGraphicsItem* item )
 {
     assert( item );
     m_startConstraints.removeAll( item );
     constraintsChanged();
 }
 
 void GraphicsItem::removeEndConstraint( ConstraintGraphicsItem* item )
 {
     assert( item );
     m_endConstraints.removeAll( item );
     constraintsChanged();
 }
 
 void GraphicsItem::updateConstraintItems()
 {
     for ( ConstraintGraphicsItem* item : qAsConst(m_startConstraints) ) {
         QPointF s = startConnector( item->constraint().relationType() );
         item->setStart( s );
     }
     for ( ConstraintGraphicsItem* item : qAsConst(m_endConstraints) ) {
         QPointF e = endConnector( item->constraint().relationType() );
         item->setEnd( e );
     }
 }
 
 void GraphicsItem::updateItem( const Span& rowGeometry, const QPersistentModelIndex& idx )
 {
     //qDebug() << "GraphicsItem::updateItem("<<rowGeometry<<idx<<")";
     Updater updater( &m_isupdating );
     if ( !idx.isValid() || idx.data( ItemTypeRole )==TypeMulti ) {
         setRect( QRectF() );
         hide();
         return;
     }
 
     const Span s = scene()->getGrid()->mapToChart( static_cast<const QModelIndex&>(idx) );
     setPos( QPointF( s.start(), rowGeometry.start() ) );
     setRect( QRectF( 0., 0., s.length(), rowGeometry.length() ) );
     setIndex( idx );
     const Span bs = scene()->itemDelegate()->itemBoundingSpan( getStyleOption(), index() );
     //qDebug() << "boundingSpan for" << getStyleOption().text << rect() << "is" << bs;
     setBoundingRect( QRectF( bs.start(), 0., bs.length(), rowGeometry.length() ) );
     const int maxh = scene()->rowController()->maximumItemHeight();
     if ( maxh < rowGeometry.length() ) {
         QRectF r = rect();
         const Qt::Alignment align = getStyleOption().displayAlignment;
         if ( align & Qt::AlignTop ) {
             // Do nothing
         } else if ( align & Qt::AlignBottom ) {
             r.setY( rowGeometry.length()-maxh );
         } else {
             // Center
             r.setY( ( rowGeometry.length()-maxh ) / 2. );
         }
         r.setHeight( maxh );
         setRect( r );
     }
 
     //scene()->setSceneRect( scene()->sceneRect().united( mapToScene( boundingRect() ).boundingRect() ) );
     //updateConstraintItems();
 }
 
 QVariant GraphicsItem::itemChange( GraphicsItemChange change, const QVariant& value )
 {
     if ( !isUpdating() && change==ItemPositionChange && scene() ) {
         QPointF newPos=value.toPointF();
         if ( isEditable() ) {
             newPos.setY( pos().y() );
             return newPos;
         } else {
             return pos();
         }
     } else if ( change==QGraphicsItem::ItemSelectedChange ) {
         if ( index().isValid() && !( index().model()->flags( index() ) & Qt::ItemIsSelectable ) ) {
             // Reject selection attempt
             return QVariant::fromValue( false );
         }
     }
 
     return QGraphicsItem::itemChange( change, value );
 }
 
 void GraphicsItem::focusInEvent( QFocusEvent* event )
 {
     Q_UNUSED( event );
 }
 
 void GraphicsItem::updateModel()
 {
     //qDebug() << "GraphicsItem::updateModel()";
     if ( isEditable() ) {
         QAbstractItemModel* model = const_cast<QAbstractItemModel*>( index().model() );
 #if !defined(NDEBUG)
         ConstraintModel* cmodel = scene()->constraintModel();
 #endif
         assert( model );
         assert( cmodel );
         if ( model ) {
             //ItemType typ = static_cast<ItemType>( model->data( index(),
             //                                                   ItemTypeRole ).toInt() );
             QList<Constraint> constraints;
             for ( QList<ConstraintGraphicsItem*>::iterator it1 = m_startConstraints.begin() ;
                  it1 != m_startConstraints.end() ;
                  ++it1 )
                 constraints.push_back((*it1)->proxyConstraint());
             for ( QList<ConstraintGraphicsItem*>::iterator it2 = m_endConstraints.begin() ;
                  it2 != m_endConstraints.end() ;
                  ++it2 )
                 constraints.push_back((*it2)->proxyConstraint());
             if ( scene()->getGrid()->mapFromChart( Span( scenePos().x(), rect().width() ),
                                                 index(),
                                                 constraints ) ) {
                 scene()->updateRow( index().parent() );
             }
         }
     }
 }
 
 void GraphicsItem::hoverMoveEvent( QGraphicsSceneHoverEvent* event )
 {
     if ( !isEditable() ) return;
     StyleOptionGanttItem opt = getStyleOption();
     ItemDelegate::InteractionState istate = scene()->itemDelegate()->interactionStateFor( event->pos(), opt, index() );
     switch ( istate ) {
     case ItemDelegate::State_ExtendLeft:
 #ifndef QT_NO_CURSOR
         setCursor( Qt::SizeHorCursor );
 #endif
         scene()->itemEntered( index() );
         break;
     case ItemDelegate::State_ExtendRight:
 #ifndef QT_NO_CURSOR
         setCursor( Qt::SizeHorCursor );
 #endif
         scene()->itemEntered( index() );
         break;
     case ItemDelegate::State_Move:
 #ifndef QT_NO_CURSOR
         setCursor( Qt::SplitHCursor );
 #endif
         scene()->itemEntered( index() );
         break;
     default:
 #ifndef QT_NO_CURSOR
         unsetCursor();
 #endif
         break;
     };
 }
 
 void GraphicsItem::hoverLeaveEvent( QGraphicsSceneHoverEvent* )
 {
 #ifndef QT_NO_CURSOR
     unsetCursor();
 #endif
 }
 
 void GraphicsItem::mousePressEvent( QGraphicsSceneMouseEvent* event )
 {
     //qDebug() << "GraphicsItem::mousePressEvent("<<event<<")";
     StyleOptionGanttItem opt = getStyleOption();
     int istate = scene()->itemDelegate()->interactionStateFor( event->pos(), opt, index() );
     // If State_None is returned by interactionStateFor(), we ignore this event so that
     // it can get forwarded to another item that's below this one. Needed, for example,
     // to allow items to be moved that are placed below the label of another item.
     if ( istate != ItemDelegate::State_None ) {
         m_istate = istate;
         m_presspos = event->pos();
         m_pressscenepos = event->scenePos();
 
         scene()->itemPressed( index(), event );
 
         switch ( m_istate ) {
         case ItemDelegate::State_ExtendLeft:
         case ItemDelegate::State_ExtendRight:
         default: /* State_Move */
             if (!(flags() & ItemIsMovable)) {
                 event->ignore();
             }
             break;
         }
     } else {
         event->ignore();
     }
 }
 
 void GraphicsItem::mouseReleaseEvent( QGraphicsSceneMouseEvent* event )
 {
     //qDebug() << "GraphicsItem::mouseReleaseEvent("<<event << ")";
     if ( !m_presspos.isNull() ) {
         scene()->itemClicked( index() );
     }
     delete m_dragline; m_dragline = nullptr;
     if ( scene()->dragSource() ) {
         // Create a new constraint
         GraphicsItem* other = qgraphicsitem_cast<GraphicsItem*>( scene()->itemAt( event->scenePos(), QTransform() ) );
         if ( other && scene()->dragSource()!=other &&
              other->index().data(KGantt::ItemTypeRole) == KGantt::TypeEvent )
         {
             // The code below fixes bug KDCH-696.
             // Modified the code to add constraint even if the user drags and drops
             // constraint on left part of the TypeEvent symbol(i.e diamond symbol)
             QRectF itemRect = other->rect().adjusted(-other->rect().height()/2.0, 0, 0, 0 );
             if ( other->mapToScene( itemRect ).boundingRect().contains( event->scenePos() ))
             {
                 GraphicsView* view = qobject_cast<GraphicsView*>( event->widget()->parentWidget() );
                 if ( view ) {
                     view->addConstraint( scene()->summaryHandlingModel()->mapToSource( scene()->dragSource()->index() ),
                                          scene()->summaryHandlingModel()->mapToSource( other->index() ), event->modifiers() );
                 }
             }
         }
         else
         {
             if ( other && scene()->dragSource()!=other &&
                  other->mapToScene( other->rect() ).boundingRect().contains( event->scenePos() )) {
                 GraphicsView* view = qobject_cast<GraphicsView*>( event->widget()->parentWidget() );
                 if ( view ) {
                     view->addConstraint( scene()->summaryHandlingModel()->mapToSource( scene()->dragSource()->index() ),
                                          scene()->summaryHandlingModel()->mapToSource( other->index() ), event->modifiers() );
                 }
             }
         }
 
         scene()->setDragSource( nullptr );
         //scene()->update();
     } else {
         if ( isEditable() ) {
             updateItemFromMouse(event->scenePos());
 
             // It is important to set m_presspos to null here because
             // when the sceneRect updates because we move the item
             // a MouseMoveEvent will be delivered, and we have to
             // protect against that
             m_presspos = QPointF();
             updateModel();
             // without this command we sometimes get a white area at the left side of a task item
             // after we moved that item right-ways into a grey weekend section of the scene:
             scene()->update();
         }
     }
 
     m_presspos = QPointF();
 }
 
 void GraphicsItem::mouseDoubleClickEvent( QGraphicsSceneMouseEvent* event )
 {
     const int typ = static_cast<ItemType>( index().model()->data( index(), ItemTypeRole ).toInt() );
     StyleOptionGanttItem opt = getStyleOption();
     ItemDelegate::InteractionState istate = scene()->itemDelegate()->interactionStateFor( event->pos(), opt, index() );
     if ( (istate != ItemDelegate::State_None) || (typ == TypeSummary)) {
         scene()->itemDoubleClicked( index() );
     }
     BASE::mouseDoubleClickEvent( event );
 }
 
 void GraphicsItem::updateItemFromMouse( const QPointF& scenepos )
 {
     //qDebug() << "GraphicsItem::updateItemFromMouse("<<scenepos<<")";
     const QPointF p = scenepos - m_presspos;
     QRectF r = rect();
     QRectF br = boundingRect();
     switch ( m_istate ) {
     case ItemDelegate::State_Move:
         setPos( p.x(), pos().y() );
         break;
     case ItemDelegate::State_ExtendLeft: {
         const qreal brr = br.right();
         const qreal rr = r.right();
         const qreal delta = pos().x()-p.x();
         setPos( p.x(), QGraphicsItem::pos().y() );
         br.setRight( brr+delta );
         r.setRight( rr+delta );
         break;
     }
     case ItemDelegate::State_ExtendRight: {
         const qreal rr = r.right();
         r.setRight( scenepos.x()-pos().x() );
         br.setWidth( br.width() + r.right()-rr );
         break;
     }
     default: return;
     }
     setRect( r );
     setBoundingRect( br );
 }
 
 void GraphicsItem::mouseMoveEvent( QGraphicsSceneMouseEvent* event )
 {
     if ( !isEditable() ) return;
     if ( m_presspos.isNull() ) return;
 
     //qDebug() << "GraphicsItem::mouseMoveEvent("<<event<<"), m_istate="<< static_cast<ItemDelegate::InteractionState>( m_istate );
     switch ( m_istate ) {
     case ItemDelegate::State_ExtendLeft:
     case ItemDelegate::State_ExtendRight:
     case ItemDelegate::State_Move:
         // Check for constraint drag
       if ( qAbs( m_pressscenepos.x()-event->scenePos().x() ) < 10.
            && qAbs( m_pressscenepos.y()-event->scenePos().y() ) > 5. ) {
             m_istate = ItemDelegate::State_DragConstraint;
             m_dragline = new QGraphicsLineItem( this );
             m_dragline->setPen( QPen( Qt::DashLine ) );
             m_dragline->setLine(QLineF( rect().center(), event->pos() ));
             scene()->setDragSource( this );
             break;
         }
 
         updateItemFromMouse(event->scenePos());
         //BASE::mouseMoveEvent(event);
         break;
     case ItemDelegate::State_DragConstraint: {
         QLineF line = m_dragline->line();
         m_dragline->setLine( QLineF( line.p1(), event->pos() ) );
         //QGraphicsItem* item = scene()->itemAt( event->scenePos() );
         break;
     }
     }
 }