[SOLVED] QGraphicsScene item moving problems

xcoder

Hello Everyone,

Could someone please explain me how to properly override the mouse events on custom QGraphicScene?
The thing is more or less everything is working for me, I can detect where I clicked and so on, but when I try to move the objects what I have on QGraphicsScene, I have to double click them to select them, and then can I only move them. As soon as I get rid of the mouse event functions, I can normally select and move my objects on the scene.

Anyway here is the code:

diagramscene.cpp
@#include "diagramscene.h"

DiagramScene::DiagramScene(QObject *parent)
: QGraphicsScene(parent)
{
myMode = MoveItem;
}

void DiagramScene::setMode(Mode newMode)
{
myMode = newMode;
}

void DiagramScene::mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
QGraphicsScene::mouseReleaseEvent(mouseEvent);
}

void DiagramScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
qDebug() << mouseEvent->scenePos() << " " << myMode << " => " << MoveItem ;
if (mouseEvent->button() != Qt::LeftButton)
return;

blockItem *item;
switch(myMode)
{
    case InsertItem:
         item = new blockItem(QRectF(mouseEvent->scenePos().x()-25,mouseEvent->scenePos().y()-25,50,50));
         addItem(item);
         item->setFlag(QGraphicsItem::ItemIsMovable, true);
         emit itemInserted();
         break;
    default: ;
}

}
@

diagramscene.h
@#ifndef DIAGRAMSCENE_H
#define DIAGRAMSCENE_H

#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QDebug>

#include "blockitem.h"

class DiagramScene : public QGraphicsScene
{
Q_OBJECT

public:
enum Mode { InsertItem, InsertLine, InsertText, MoveItem };
DiagramScene(QObject *parent = 0);

public slots:
void setMode(Mode newMode);

signals:
void itemInserted();

protected:
void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);

private:
Mode myMode;
bool mouseButtonDown;
QPointF startPoint;
};

#endif // DIAGRAMSCENE_H
@

DerManu

You're not calling the base class implementation of mousePressEvent. I guess from your code that you'll want to call it in all cases except when inserting a new item.

xcoder

Thank you very much. Makes sense :)

@void DiagramScene::mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent)
{
//my scene stuff here

//Call the base class implementation of mouse press event
GraphicsScene::mousePressEvent(mouseEvent);

}
@