'How can I intercept the pressing of multiply (*) key in my C++ Qt calculator app?

I'm new in Qt and now working on calculator application that has opportunity of keyboard input (1,2,3,4,5,6,7,8,9,0,-,+,/,*,.,(,),).

Firstly, I tried just to determine "keyPressEvent" method like this:

void MainWindow::keyPressEvent(QKeyEvent* ev)
{
    QString CurrentLabel_disp = ui->label->text();
    QString KeyPressed;

    if (ev->key() == Qt::Key_0)
        KeyPressed = "0";
    else if (ev->key() == Qt::Key_1)
        KeyPressed = "1";
...    

    else if (ev->key() == Qt::Key_Plus)
        KeyPressed = "+";
    else if (ev->key() == Qt::Key_Minus)
        KeyPressed = "-";
    else if (ev->key() == Qt::Key_Slash)
        KeyPressed = "/";
    else if (ev->key() == Qt::Key_multiply)
        KeyPressed = "*";
}

after some reflection I decided to reimplement "bool eventFilter()" and use "installEventFilter(this)" method instead of "keyPressEvent" determination:

bool MainWindow::eventFilter(QObject *obj, QEvent *event){
    if(obj==this && event->type()==QEvent::KeyPress){
        QKeyEvent* keyEvent=static_cast<QKeyEvent*>(event);
        QString KeyPressed;
        switch (keyEvent->key()) {
        case Qt::Key_0:
             KeyPressed="0";VisualItem_key_pressed(KeyPressed);return true;
        case Qt::Key_1:
             KeyPressed="1";VisualItem_key_pressed(KeyPressed);return true;

...       

        case Qt::Key_Plus:
             KeyPressed="+";VisualItem_key_pressed(KeyPressed);return true;
        case Qt::Key_Minus:
             KeyPressed="-";VisualItem_key_pressed(KeyPressed);return true;
        case Qt::Key_Slash:
             KeyPressed="/";VisualItem_key_pressed(KeyPressed);return true;
        case Qt::Key_multiply:
             KeyPressed="*";VisualItem_key_pressed(KeyPressed);return true;
        }
    }
    return QMainWindow::eventFilter(obj,event);
}

But in the first and second cases multiply key (*) was not working unlike the other keys..

So, the problem is in fact, that programm doesn't associate pressing (*) key on numpad or pressing (shift+8) with "case Qt::Key_multiply"

maybe the problem is in "Qt::Key_multiply", because I really dont know how numpad decimal separator (.) and multiply (*) symbols called in Qt..

Can you direct me to this problem's solution?

c++qt5calculator


Solution 1:[1]

try using this case (Qt::Key_Asterisk):

Sources

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Source: Stack Overflow

Solution Source
Solution 1 omar yossuf

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