Using QTimer and mouseMoveEvent

[LaTj]

I am trying to use a QTimer with a mouseMoveEvent to highlight some cards. I do not know what I am doing wrong. If someone can give me some useful hints.

//In Constructor
    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(highlightCard()));
    timer->start(500);
 
void Canvas::mouseMoveEvent(QMouseEvent *event)
{
    if (event->type() == QEvent::MouseMove)
    {
        x_pos = event->pos().x();
        y_pos = event->pos().y();
     }
}
 
void Canvas::highlightCard()
{
    QGraphicsColorizeEffect *effect = new QGraphicsColorizeEffect(this);
    effect->setColor(QPalette::Highlight);
 
    for (int i = 0; i < MAXCARDS; i++)
    {
        if (cardIconPlayer[i]->pos() == QPoint(x_pos, y_pos))
            cardIconPlayer[i]->setGraphicsEffect(effect);
    }
}

//In Constructor
    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(highlightCard()));
    timer->start(500);

void Canvas::mouseMoveEvent(QMouseEvent *event)
{
    if (event->type() == QEvent::MouseMove)
    {
        x_pos = event->pos().x();
        y_pos = event->pos().y();
     }
}

void Canvas::highlightCard()
{
    QGraphicsColorizeEffect *effect = new QGraphicsColorizeEffect(this);
    effect->setColor(QPalette::Highlight);

    for (int i = 0; i < MAXCARDS; i++)
    {
        if (cardIconPlayer[i]->pos() == QPoint(x_pos, y_pos))
            cardIconPlayer[i]->setGraphicsEffect(effect);
    }
}

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[anda_skoa]

What do you expect to happen?

Do you manage to move the mouse to exactly one of the cardIconPlayer positions in the 500ms after creating the widget?

Cheers,
_

[LaTj]

I am a newbie, so I erroneously thought this code will highlight the card. So yes that is what I thought would happen. If you can point out what I can do to highlight those cardIconPlayer's with other methods, corrections, or further my studies in a certain topic then I would greatly appreciate it.

I know C++ but not Qt, so this is interesting to me but really new.

[ChrisW67]

Your highlight routine is called once every 500 ms and will do something if the last mouse move event over this widget recorded a position that precisely matches the position of one of your cardIconPlayer objects (whatever they are). That's a precise match on a single pixel position not an area: unlikely to occur, I think you'll agree.

What type are the cardIconPlayer objects?

[LaTj]

cardIconPlayer is a QLabel and this is how I set up the icons using pixmap.

void Canvas::setUpPlayerIcons(string *pString)
{
    QPixmap qpx;
    QSize iconSize;
    string str;
 
    for (int i = 0; i < MAXCARDS; i++)
    {
        shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);
 
        cardIconPlayer[i] = new QLabel(cardTable);
        str = pString[i];
        qpx = QPixmap(str.c_str());
        iconSize = qpx.size();
        iconSize.scale(190, 276, Qt::KeepAspectRatio);
        QPixmap scaledImage = qpx.scaled(iconSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
        cardIconPlayer[i]->setPixmap(scaledImage);
        cardIconPlayer[i]->move(20 + 60 * i, 350);
        cardIconPlayer[i]->setGraphicsEffect(shadow);
 
        //playerPixmaps.push_back(scaledImage);
    }
 
}

void Canvas::setUpPlayerIcons(string *pString)
{
    QPixmap qpx;
    QSize iconSize;
    string str;

    for (int i = 0; i < MAXCARDS; i++)
    {
        shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);

        cardIconPlayer[i] = new QLabel(cardTable);
        str = pString[i];
        qpx = QPixmap(str.c_str());
        iconSize = qpx.size();
        iconSize.scale(190, 276, Qt::KeepAspectRatio);
        QPixmap scaledImage = qpx.scaled(iconSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
        cardIconPlayer[i]->setPixmap(scaledImage);
        cardIconPlayer[i]->move(20 + 60 * i, 350);
        cardIconPlayer[i]->setGraphicsEffect(shadow);

        //playerPixmaps.push_back(scaledImage);
    }

}

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Just to get this straight. Are you saying I should use QRect instead of QPoint.

[ChrisW67]

I would be inclined to make the QLabels look after their own highlighting when the mouse is over them.

#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include <QLabel>
#include <QPixmap>
#include <QGraphicsDropShadowEffect>
 
class Label: public QLabel
{
    Q_OBJECT
public:
    Label(QWidget *p = 0): QLabel(p) 
    {
        QPixmap pixmap(200, 200);
        pixmap.fill(QColor("mediumseagreen"));
        setPixmap(pixmap);
        setFrameStyle(QFrame::Box);
 
        QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);
        shadow->setColor(QColor("orchid"));
        setGraphicsEffect(shadow);
    }
protected:
    void enterEvent(QEvent *event)
    {
        QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);
        shadow->setColor(QColor("lightsalmon"));
        setGraphicsEffect(shadow);
    }
    void leaveEvent(QEvent *event)
    {
        QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);
        shadow->setColor(QColor("orchid"));
        setGraphicsEffect(shadow);
    }
};
 
class Widget: public QWidget
{
    Q_OBJECT
public:
    Widget(QWidget *p = 0): QWidget(p)
    {
        QVBoxLayout *layout = new QVBoxLayout(this);
        layout->addWidget(new Label);
        layout->addWidget(new Label);
    }
};
 
int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    Widget w;
    w.show();
    return app.exec();
}
#include "main.moc"

#include <QApplication>
#include <QWidget>
#include <QVBoxLayout>
#include <QLabel>
#include <QPixmap>
#include <QGraphicsDropShadowEffect>

class Label: public QLabel
{
    Q_OBJECT
public:
    Label(QWidget *p = 0): QLabel(p) 
    {
        QPixmap pixmap(200, 200);
        pixmap.fill(QColor("mediumseagreen"));
        setPixmap(pixmap);
        setFrameStyle(QFrame::Box);

        QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);
        shadow->setColor(QColor("orchid"));
        setGraphicsEffect(shadow);
    }
protected:
    void enterEvent(QEvent *event)
    {
        QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);
        shadow->setColor(QColor("lightsalmon"));
        setGraphicsEffect(shadow);
    }
    void leaveEvent(QEvent *event)
    {
        QGraphicsDropShadowEffect *shadow = new QGraphicsDropShadowEffect(this);
        shadow->setBlurRadius(10);
        shadow->setColor(QColor("orchid"));
        setGraphicsEffect(shadow);
    }
};

class Widget: public QWidget
{
    Q_OBJECT
public:
    Widget(QWidget *p = 0): QWidget(p)
    {
        QVBoxLayout *layout = new QVBoxLayout(this);
        layout->addWidget(new Label);
        layout->addWidget(new Label);
    }
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    Widget w;
    w.show();
    return app.exec();
}
#include "main.moc"

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[LaTj]

Thank you very much, this was more than thankful. Sorry for the late reply