CODEWITHSUNDEEP
c++qtqt-creator
Bar
Bar

Reputation: 69

QGraphicsPixmapItem with non-responsive keyPressEvent

I'm trying to implement a basic game...

I press keyboard buttons but the QGraphicsPixmapItem I added to my QGraphicsScene doesn't move, I have implemented a keyPressedEvent function...

I want to move the pixmap item when a key is pressed.

code is below....

marioChar.h (the header file for my pixmap item)

 class marioChar : public QObject, public QGraphicsPixmapItem
{
Q_OBJECT
public:
    bool flying;
    explicit marioChar(QPixmap pic);
    void keyPressEvent(QKeyEvent *event);

signals:

public slots:
 };

This is the implementation of the keypressEvent handler:

   void marioChar::keyPressEvent(QKeyEvent *event)
{
    if(event->key()==Qt::Key_Right)
    {
        if(x()<380)
        {
            this->setPos(this->x()+20,this->y());
        }
    }
}

This is part of the game class where i add the pixmap item to the scene



game::game(int difficulty_Level)
{

       set_Level(difficulty_Level);
       set_Num_Of_Coins(0);
       set_Score(0);
       QGraphicsScene *scene = new QGraphicsScene();
       header = new QGraphicsTextItem();
       header->setZValue(1000);
       timer = new QTimer();
       time = new QTime();
       time->start();
       updateDisplay();
       scene->addItem(header);

       connect(timer,SIGNAL(timeout()),this,SLOT(updateDisplay()));
       timer->start(500);

       QGraphicsView *view = new QGraphicsView(scene);
       scene->setSceneRect(0,0,1019,475);

       QColor skyBlue;
       skyBlue.setRgb(135,206,235);
       view->setBackgroundBrush(QBrush(skyBlue));

       QGraphicsRectItem *floor = new QGraphicsRectItem(0,460,1024,20);
       floor->setBrush(Qt::black);
       scene->addItem(floor);

       player= new marioChar(QPixmap("MarioF.png"));
       player->setPos(0,330);
       player->setZValue(1003);
       scene->addItem(player);

       view->setFixedSize(1024,480);
       view->show();
       player->setFocus();
    }

Thanks in advance

Upvotes: 0

Views: 527

Answers (3)

Bar
Bar

Reputation: 69

As thuga said: "set the QGraphicsItem::ItemIsFocusable flag to your marioChar object"

Upvotes: 0

thuga
thuga

Reputation: 12901

You need to set the QGraphicsItem::ItemIsFocusable flag to your graphics item if you want it to listen to the key events.

From the docs:

Note that key events are only received for items that set the ItemIsFocusable flag, and that have keyboard input focus.

And the description of the QGraphicsItem::ItemIsFocusable flag:

The item supports keyboard input focus (i.e., it is an input item). Enabling this flag will allow the item to accept focus, which again allows the delivery of key events to QGraphicsItem::keyPressEvent() and QGraphicsItem::keyReleaseEvent().

Upvotes: 3

Chris
Chris

Reputation: 279

Your QGraphicsPixmapItem should not inherit from QObject. You should create a controller that manages your QGraphicsPixmapItem and will emit signals and handle the slots for all QGraphicsPixmapItem's in your game.

Upvotes: 0

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