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QGraphicsLineItem + setAcceptHoverEvents

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N1Rulez

Beginner

Posts: 18

1

Wednesday, May 7th 2008, 7:02pm

QGraphicsLineItem + setAcceptHoverEvents

Hey @all,

i'm trying to get the hover effect working for my QGraphicsLineItem object.
I have subclassed the QGraphicsLineItem class, and in the constructor i wrote:

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setAcceptHoverEvents(true);


I implemented the protected functions like below:

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void Arrow::hoverEnterEvent(QGraphicsSceneHoverEvent * event) {
    //QGraphicsLineItem::hoverEnterEvent(event);
    qDebug() << "void Arrow::hoverEnterEvent(QGraphicsSceneHoverEvent * event)";
    pen().setColor(QColor(204, 0, 255, 76));
}

void Arrow::hoverLeaveEvent(QGraphicsSceneHoverEvent * event) {
    qDebug() << "void Arrow::hoverLeaveEvent(QGraphicsSceneHoverEvent * event)";
    pen().setColor(myColor);
}


But when i come over the line with my mouse pointer the functions doesn't be executed?

What i'am doing wrong? Can anybody help me.

Regards
N1Rulez
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N1Rulez

Beginner

Posts: 18

2

Wednesday, May 7th 2008, 7:02pm

I forgot to say, I'm using QT 4.4.0 under Windows XP
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flowerJT

Trainee

Posts: 64

Location: Berlin, Germany

3

Wednesday, May 7th 2008, 7:58pm

I think that the methods are called. The fact that you didn't see your output to stderr maybe caused that you added "windows" instead of "console" to your "CONFIG" qmake variable. It should work like this

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void Arrow::hoverEnterEvent(QGraphicsSceneHoverEvent * event) {
    //QGraphicsLineItem::hoverEnterEvent(event);
    qDebug() << "void Arrow::hoverEnterEvent(QGraphicsSceneHoverEvent * event)";
    //pen().setColor(QColor(204, 0, 255, 76));
    this->setPen( QPen( QColor( 204, 0, 255, 76 ) );
    
    this->update();
}


Best regards
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N1Rulez

Beginner

Posts: 18

4

Wednesday, May 7th 2008, 8:35pm

It doesn't work :(

by the way, normally i saw also qDebug() messages, because there are a tool called DebugView (http://technet.microsoft.com/en-us/sysin…60d7d96cf2.aspx), which work with signals and slots.

So, for other events (such as paint()) i saw the qDebug() output. But not for the Hover event. The line also doesn't change the color.

Is it a bug in QT 4.4.0? Or is there an other way to simulate an Hover Effect?

Regards
N1Rulez

This post has been edited 2 times, last edit by "N1Rulez" (May 7th 2008, 9:14pm)

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Nicolas SOUCHON

Professional

Posts: 920

5

Thursday, May 8th 2008, 10:11am

only the code concerning QGraphicsSceneHoverEvent is not sufficient

some environment would be needed for how your items are implemented

as an exemple, placing your Arrow item in a QGraphicsItemGroup could explain such a problem
if it is the case, have a look at QGraphicsItemGroup documentation § Detailed Description
Nicolas
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N1Rulez

Beginner

Posts: 18

6

Thursday, May 8th 2008, 10:59am

Hmm... I dond't no what you mean, but I placed my arrow item directly into the QGraphicsScene as shown:

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if (startItems.count() > 0 && endItems.count() > 0 &&
                        startItems.first()->type() == GraphicsRectItem::Type &&
                        endItems.first()->type() == GraphicsRectItem::Type &&
                        startItems.first() != endItems.first()) {
                        //qDebug() << "in Arrow IF";
                        GraphicsRectItem *startItem =
                            qgraphicsitem_cast<GraphicsRectItem *>(startItems.first());
                        GraphicsRectItem *endItem =
                            qgraphicsitem_cast<GraphicsRectItem *>(endItems.first());
                        Arrow *arrow = new Arrow(startItem, endItem);
                        arrow->setColor(myLineColor);
                        startItem->addArrow(arrow);
                        endItem->addArrow(arrow);
                        arrow->setZValue(-1000.0);
                        addItem(arrow);                      // Add the arrow to the scene
                        arrow->updatePosition();
                    }


I have use the DiagramScene Example from QT and modified it a little

Regards
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Nicolas SOUCHON

Professional

Posts: 920

7

Thursday, May 8th 2008, 11:37am

could you send complete compiling code
if it's derived from example and just a little modified
so there is no indiscretion to look at it
Nicolas

This post has been edited 1 times, last edit by "Nicolas SOUCHON" (May 8th 2008, 11:38am)

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N1Rulez

Beginner

Posts: 18

8

Friday, May 9th 2008, 10:01am

ok,

here are the arrow.h:

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#ifndef ARROW_H
#define ARROW_H

#include <QObject>
#include <QGraphicsLineItem>
#include "graphicsrectitem.h"

class QGraphicsLineItem;
class GraphicsRectItem;

class Arrow : public QObject, public QGraphicsLineItem {
    Q_OBJECT

public:
    enum { Type = UserType + 4 };

    Arrow(GraphicsRectItem *startItem, GraphicsRectItem *endItem,
          QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);
    Arrow(QGraphicsItem *parent = 0, QGraphicsScene *scene = 0);
    void setObjects(GraphicsRectItem *startItem, GraphicsRectItem *endItem);
    int type() const { return Type; }
    QRectF boundingRect() const;
    QPainterPath shape() const;
    void setColor(const QColor &color) { myColor = color; }
    GraphicsRectItem *startItem() const { return myStartItem; }
    GraphicsRectItem *endItem() const { return myEndItem; }

public slots:
    void updatePosition();

protected:
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option,
               QWidget *widget = 0);
    void hoverEnterEvent(QGraphicsSceneHoverEvent * event);
    void hoverLeaveEvent(QGraphicsSceneHoverEvent * event);

private:
    GraphicsRectItem *myStartItem;
    GraphicsRectItem *myEndItem;
    QColor myColor;
    QPolygonF arrowHead;

signals:
	void insertConnections(qint32 start_item_id, qint32 start_schema_id, qreal start_pos_x,
                           qreal start_pos_y, qreal start_pos_z, qint32 end_item_id,
                           qint32 end_schema_id, qreal end_pos_x, qreal end_pos_y,
                           qreal end_pos_z);
    void updateConnections(qint32 start_item_id, qint32 start_schema_id, qreal start_pos_x,
                           qreal start_pos_y, qreal start_pos_z, qint32 end_item_id,
                           qint32 end_schema_id, qreal end_pos_x, qreal end_pos_y,
                           qreal end_pos_z);
};

#endif


And the arrow.cpp:

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#include <QtGui>

#include "arrow.h"
#include <math.h>

const qreal Pi = 3.14;

Arrow::Arrow(GraphicsRectItem *startItem, GraphicsRectItem *endItem,
         QGraphicsItem *parent, QGraphicsScene *scene)
    : QGraphicsLineItem(parent, scene) {
    myStartItem = startItem;
    myEndItem = endItem;
    setFlag(QGraphicsItem::ItemIsSelectable, true);
    myColor = Qt::black;
    setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
    setAcceptHoverEvents(true);

    // Insert Connection Location
    qint32 start_item_id = 0;
    qint32 start_schema_id = 0;
    qreal start_pos_x = 0;
    qreal start_pos_y = 0;
    qreal start_pos_z = 0;

    qint32 end_item_id = 0;
    qint32 end_schema_id = 0;
    qreal end_pos_x = 0;
    qreal end_pos_y = 0;
    qreal end_pos_z = 0;

    if(myEndItem->whichSide() == GraphicsRectItem::RightSide && myStartItem->whichSide() == GraphicsRectItem::LeftSide) {
        start_item_id = myEndItem->objectID();
        start_schema_id = 1;
        start_pos_x = myEndItem->rect().x() + myEndItem->rect().width() + myEndItem->parentItem()->pos().x();
        start_pos_y = myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y();
        start_pos_z = myEndItem->zValue();

        end_item_id = myStartItem->objectID();
        end_schema_id = 1;
        end_pos_x = myStartItem->rect().x() + myStartItem->parentItem()->pos().x();
        end_pos_y = myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y();
        end_pos_z = myStartItem->zValue();

        emit insertConnections(start_item_id,       // start_item_id
                               start_schema_id,     // start_schema_id
                               start_pos_x,         // start_pos_x
                               start_pos_y,         // start_pos_y
                               start_pos_z,         // start_pos_z
                               end_item_id,         // end_item_id
                               end_schema_id,       // end_schema_id
                               end_pos_x,           // end_pos_x
                               end_pos_y,           // end_pos_y
                               end_pos_z);          // end_pos_z
    }
    else {
        start_item_id = myStartItem->objectID();
        start_schema_id = 1;
        start_pos_x = myStartItem->rect().x() + myStartItem->rect().width() + myStartItem->parentItem()->pos().x();
        start_pos_y = myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y();
        start_pos_z = myStartItem->zValue();

        end_item_id = myEndItem->objectID();
        end_schema_id = 1;
        end_pos_x = myEndItem->rect().x() + myEndItem->parentItem()->pos().x();
        end_pos_y = myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y();
        end_pos_z = myEndItem->zValue();

        emit insertConnections(start_item_id,       // start_item_id
                               start_schema_id,     // start_schema_id
                               start_pos_x,         // start_pos_x
                               start_pos_y,         // start_pos_y
                               start_pos_z,         // start_pos_z
                               end_item_id,         // end_item_id
                               end_schema_id,       // end_schema_id
                               end_pos_x,           // end_pos_x
                               end_pos_y,           // end_pos_y
                               end_pos_z);          // end_pos_z
    }
}

Arrow::Arrow(QGraphicsItem *parent, QGraphicsScene *scene) : QGraphicsLineItem(parent, scene) {
    setFlag(QGraphicsItem::ItemIsSelectable, true);
    myColor = Qt::black;
    setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
    setAcceptHoverEvents(true);
}

void Arrow::setObjects(GraphicsRectItem *startItem, GraphicsRectItem *endItem) {
    myStartItem = startItem;
    myEndItem = endItem;

    // Insert Connection Location
    qint32 start_item_id = 0;
    qint32 start_schema_id = 0;
    qreal start_pos_x = 0;
    qreal start_pos_y = 0;
    qreal start_pos_z = 0;

    qint32 end_item_id = 0;
    qint32 end_schema_id = 0;
    qreal end_pos_x = 0;
    qreal end_pos_y = 0;
    qreal end_pos_z = 0;

    if(myEndItem->whichSide() == GraphicsRectItem::RightSide && myStartItem->whichSide() == GraphicsRectItem::LeftSide) {
        start_item_id = myEndItem->objectID();
        start_schema_id = 1;
        start_pos_x = myEndItem->rect().x() + myEndItem->rect().width() + myEndItem->parentItem()->pos().x();
        start_pos_y = myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y();
        start_pos_z = myEndItem->zValue();

        end_item_id = myStartItem->objectID();
        end_schema_id = 1;
        end_pos_x = myStartItem->rect().x() + myStartItem->parentItem()->pos().x();
        end_pos_y = myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y();
        end_pos_z = myStartItem->zValue();

        emit insertConnections(start_item_id,       // start_item_id
                               start_schema_id,     // start_schema_id
                               start_pos_x,         // start_pos_x
                               start_pos_y,         // start_pos_y
                               start_pos_z,         // start_pos_z
                               end_item_id,         // end_item_id
                               end_schema_id,       // end_schema_id
                               end_pos_x,           // end_pos_x
                               end_pos_y,           // end_pos_y
                               end_pos_z);          // end_pos_z
    }
    else {
        start_item_id = myStartItem->objectID();
        start_schema_id = 1;
        start_pos_x = myStartItem->rect().x() + myStartItem->rect().width() + myStartItem->parentItem()->pos().x();
        start_pos_y = myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y();
        start_pos_z = myStartItem->zValue();

        end_item_id = myEndItem->objectID();
        end_schema_id = 1;
        end_pos_x = myEndItem->rect().x() + myEndItem->parentItem()->pos().x();
        end_pos_y = myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y();
        end_pos_z = myEndItem->zValue();

        emit insertConnections(start_item_id,       // start_item_id
                               start_schema_id,     // start_schema_id
                               start_pos_x,         // start_pos_x
                               start_pos_y,         // start_pos_y
                               start_pos_z,         // start_pos_z
                               end_item_id,         // end_item_id
                               end_schema_id,       // end_schema_id
                               end_pos_x,           // end_pos_x
                               end_pos_y,           // end_pos_y
                               end_pos_z);          // end_pos_z
    }
}

QRectF Arrow::boundingRect() const {
    qreal extra = (pen().width() + 20) / 2.0;

    return QRectF(line().p1(), QSizeF(line().p2().x() - line().p1().x(),
                                      line().p2().y() - line().p1().y()))
        .normalized()
        .adjusted(-extra, -extra, extra, extra);
}

QPainterPath Arrow::shape() const {
    QPainterPath path = QGraphicsLineItem::shape();
    path.addPolygon(arrowHead);
    return path;
}

void Arrow::updatePosition() {
    QLineF line(mapFromItem(myStartItem, 0, 0), mapFromItem(myEndItem, 0, 0));
    setLine(line);

    // Update Connection Location
    qint32 start_item_id = 0;
    qint32 start_schema_id = 0;
    qreal start_pos_x = 0;
    qreal start_pos_y = 0;
    qreal start_pos_z = 0;

    qint32 end_item_id = 0;
    qint32 end_schema_id = 0;
    qreal end_pos_x = 0;
    qreal end_pos_y = 0;
    qreal end_pos_z = 0;

    if(myEndItem->whichSide() == GraphicsRectItem::RightSide && myStartItem->whichSide() == GraphicsRectItem::LeftSide) {
        start_item_id = myEndItem->objectID();
        start_schema_id = 1;
        start_pos_x = myEndItem->rect().x() + myEndItem->rect().width() + myEndItem->parentItem()->pos().x();
        start_pos_y = myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y();
        start_pos_z = myEndItem->zValue();

        end_item_id = myStartItem->objectID();
        end_schema_id = 1;
        end_pos_x = myStartItem->rect().x() + myStartItem->parentItem()->pos().x();
        end_pos_y = myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y();
        end_pos_z = myStartItem->zValue();

        emit updateConnections(start_item_id,       // start_item_id
                               start_schema_id,     // start_schema_id
                               start_pos_x,         // start_pos_x
                               start_pos_y,         // start_pos_y
                               start_pos_z,         // start_pos_z
                               end_item_id,         // end_item_id
                               end_schema_id,       // end_schema_id
                               end_pos_x,           // end_pos_x
                               end_pos_y,           // end_pos_y
                               end_pos_z);          // end_pos_z
    }
    else {
        start_item_id = myStartItem->objectID();
        start_schema_id = 1;
        start_pos_x = myStartItem->rect().x() + myStartItem->rect().width() + myStartItem->parentItem()->pos().x();
        start_pos_y = myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y();
        start_pos_z = myStartItem->zValue();

        end_item_id = myEndItem->objectID();
        end_schema_id = 1;
        end_pos_x = myEndItem->rect().x() + myEndItem->parentItem()->pos().x();
        end_pos_y = myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y();
        end_pos_z = myEndItem->zValue();

        emit updateConnections(start_item_id,       // start_item_id
                               start_schema_id,     // start_schema_id
                               start_pos_x,         // start_pos_x
                               start_pos_y,         // start_pos_y
                               start_pos_z,         // start_pos_z
                               end_item_id,         // end_item_id
                               end_schema_id,       // end_schema_id
                               end_pos_x,           // end_pos_x
                               end_pos_y,           // end_pos_y
                               end_pos_z);          // end_pos_z
    }
}

void Arrow::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) {
    if (myStartItem->collidesWithItem(myEndItem)) {
        qDebug() << "!!!!!!!!!!!!!!!!(myStartItem->collidesWithItem(myEndItem))";
        return;
    }

     QPen myPen = pen();
     myPen.setColor(myColor);
     painter->setPen(myPen);
     painter->setBrush(myColor);

     QLineF centerLine(myStartItem->pos(), myEndItem->pos());
     QPolygonF endPolygon = QPolygonF(myEndItem->rect());//myEndItem->polygon();
     QPointF p1 = endPolygon.first() + myEndItem->pos();
     QPointF p2;
     QPointF intersectPoint;
     QLineF polyLine;
     for (int i = 0; i < endPolygon.count(); ++i) {
         p2 = endPolygon.at(i) + myEndItem->pos();
         polyLine = QLineF(p1, p2);
         QLineF::IntersectType intersectType = polyLine.intersect(centerLine, &intersectPoint);
         if (intersectType == QLineF::BoundedIntersection)
             break;
             p1 = p2;
     }

    if(myEndItem->whichSide() == GraphicsRectItem::RightSide && myStartItem->whichSide() == GraphicsRectItem::LeftSide) {
        setLine(QLineF(myEndItem->rect().x() + myEndItem->rect().width() + myEndItem->parentItem()->pos().x() + 10,
                   myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y(),
                   myStartItem->rect().x() + myStartItem->parentItem()->pos().x() - 10,
                   myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y()));

        QGraphicsLineItem *left_l = new QGraphicsLineItem(this);
        left_l->setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
        left_l->setLine(myStartItem->rect().x() + myStartItem->parentItem()->pos().x(),
                        myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y(),
                        myStartItem->rect().x() + myStartItem->parentItem()->pos().x() - 10,
                        myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y());
        left_l->setParentItem(this);


        QGraphicsLineItem *left_r = new QGraphicsLineItem(this);
        left_r->setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
        left_r->setLine(myEndItem->rect().x() + myEndItem->rect().width() + myEndItem->parentItem()->pos().x(),
                        myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y(),
                        myEndItem->rect().x() + myEndItem->rect().width() + myEndItem->parentItem()->pos().x() + 10,
                        myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y());
        left_r->setParentItem(this);
    }
    else {
        setLine(QLineF(myEndItem->rect().x() + myEndItem->parentItem()->pos().x() - 10,
                       myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y(),
                       myStartItem->rect().x() + myStartItem->rect().width() + myStartItem->parentItem()->pos().x() + 10,
                       myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y()));

        QGraphicsLineItem *left_l = new QGraphicsLineItem(this);
        left_l->setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
        left_l->setLine(myEndItem->rect().x() + myEndItem->parentItem()->pos().x(),
                        myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y(),
                        myEndItem->rect().x() + myEndItem->parentItem()->pos().x() - 10,
                        myEndItem->rect().y() + (myEndItem->rect().height()/2) + myEndItem->parentItem()->pos().y());
        left_l->setParentItem(this);


        QGraphicsLineItem *left_r = new QGraphicsLineItem(this);
        left_r->setPen(QPen(myColor, 2, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
        left_r->setLine(myStartItem->rect().x() + myStartItem->rect().width() + myStartItem->parentItem()->pos().x(),
                        myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y(),
                        myStartItem->rect().x() + myStartItem->rect().width() + myStartItem->parentItem()->pos().x() + 10,
                        myStartItem->rect().y() + (myStartItem->rect().height()/2) + myStartItem->parentItem()->pos().y());
        left_r->setParentItem(this);
    }

     double angle = ::acos(line().dx() / line().length());
     if (line().dy() >= 0)
         angle = (Pi * 2) - angle;

         painter->drawLine(line());
         if (isSelected()) {
             painter->setPen(QPen(myColor, 1, Qt::DashLine));
             QLineF myLine = line();
             myLine.translate(0, 4.0);
             painter->drawLine(myLine);
             myLine.translate(0,-8.0);
             painter->drawLine(myLine);
         }
    setAcceptHoverEvents(true);
}


void Arrow::hoverEnterEvent(QGraphicsSceneHoverEvent * event) {
    QGraphicsLineItem::hoverEnterEvent(event);
    qDebug() << "void Arrow::hoverEnterEvent(QGraphicsSceneHoverEvent * event)";
    this->setPen(QPen(QColor( 204, 0, 255, 76)));
    this->update();
}

void Arrow::hoverLeaveEvent(QGraphicsSceneHoverEvent * event) {
    qDebug() << "void Arrow::hoverLeaveEvent(QGraphicsSceneHoverEvent * event)";
    this->setPen(QPen(myColor));
    this->update();
}


Regards
N1Rulez

This post has been edited 1 times, last edit by "N1Rulez" (May 9th 2008, 10:01am)

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Nicolas SOUCHON

Professional

Posts: 920

9

Friday, May 9th 2008, 6:03pm

I've added hover events to Arrow class in diagramscene example and it works
Nicolas
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