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How assign the enter key to a button

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  • F Offline
    F Offline
    fs_tigre
    wrote on last edited by
    #10

    Thank you all.

    How do you apply the event filter to a button?

    I tried this but it dint work.
    @ui->pushButton_Calculate->eventFilter(pushButton,true);@

    Thanks

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    • A Offline
      A Offline
      andre
      wrote on last edited by
      #11

      No, that does not work. Did you read the documenation on event filters? You need to install it on the top-level widget, subclass your Button, and reimplement the eventFilter method.

      Alternatively, and easier: you can use a [[doc:QShortCut]]. Just create a shortcut for the Enter key, and connect it's activated() signal to the click() slot of the button.

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      • F Offline
        F Offline
        fs_tigre
        wrote on last edited by
        #12

        bq. No, that does not work. Did you read the documenation on event filters? You need to install it on the top-level widget, subclass your Button, and reimplement the eventFilter method.

        I actually did, the problem is that I'm a beginner on Qt as well as on C++, so I don't completely understand the documentation. In fact I'm having a hard time following your instructions... Sorry!!!
        bq. You need to install it on the top-level widget, subclass your Button, and reimplement the eventFilter method.

        Too advanced. I know I know, its probably a pain to teach a beginner. I will reread and try again.

        Thanks a lot for your help

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        • A Offline
          A Offline
          andre
          wrote on last edited by
          #13

          Why don't you try try the QShortCut method then? That should be easier...

          Having a basic understanding of C++, including classes & objects, inheritance and polymorphism is really needed to work with Qt. If you don't understand those, then please get a C++ book and learn about them. It will make it much easier for you to understand Qt.

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          • F Offline
            F Offline
            fs_tigre
            wrote on last edited by
            #14

            bq. Why don’t you try try the QShortCut method then? That should be easier…
            Having a basic understanding of C++, including classes & objects, inheritance and polymorphism is really needed to work with Qt. If you don’t understand those, then please get a C++ book and learn about them. It will make it much easier for you to understand Qt.

            I will try the short cut. As far as learning C++, I'm currently taking a class and reading as much as I can.

            Thanks a lot for your help!

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            • F Offline
              F Offline
              fs_tigre
              wrote on last edited by
              #15

              I tried the QShortcut but I cannot make it work.

              Here is my code, I dont get any errors but it doen't assign the enter key to my button
              @ QShortcut *shortcut = new QShortcut(QKeySequence("Enter"), ui->groupBox);
              QObject::connect(shortcut, SIGNAL(activated()), ui->pushButton_Calculate, SLOT(click()));@
              I also tried...
              @QShortcut *shortcut = new QShortcut(QKeySequence(Qt::Key_Enter), ui->groupBox);
              QObject::connect(shortcut, SIGNAL(activated()), ui->pushButton_Calculate, SLOT(click()));@
              But it didn't work.

              Any idea why this is not working?

              thanks

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              • R Offline
                R Offline
                RaubTieR
                wrote on last edited by
                #16

                Also you can reimplement this for your window
                @void MainWindow::keyPressEvent(QKeyEvent* pe)
                {
                if(pe->key() == Qt::Key_Return) yout_button_slot();
                }@

                this function is virtual and present in QMainWindow's base class, though may be you will need
                @#include <QKeyEvent>@

                you may also check for Key_Enter which is actually numpad one

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                • F Offline
                  F Offline
                  fs_tigre
                  wrote on last edited by
                  #17

                  @void MainWindow::keyPressEvent(QKeyEvent* pe)
                  {
                  if(pe->key() == Qt::Key_Return) yout_button_slot();
                  }@

                  Sorry but I'm lost now. Where do I place this function?

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                  • R Offline
                    R Offline
                    RaubTieR
                    wrote on last edited by
                    #18

                    well you've told you have a window with buttons, this window has a specific class, which might be declared like that for instance (by default for single window gui app) :

                    @class MainWindow : public QMainWindow
                    {
                    Q_OBJECT

                    public:
                    explicit MainWindow(QWidget *parent = 0);
                    ~MainWindow();

                    private:
                    Ui::MainWindow *ui;

                    // here i add this function
                    protected:
                    void keyPressEvent(QKeyEvent* pe);
                    };@

                    in protected section you declare the function, you may define it here or in the corresponding .cpp file - as usual method

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                    • F Offline
                      F Offline
                      fs_tigre
                      wrote on last edited by
                      #19

                      I found my problem, I had my code in the wrong place.

                      This is the code that worked.
                      @QShortcut *returnShortcut = new QShortcut(QKeySequence("Return"), ui->groupBox);
                      QObject::connect(returnShortcut, SIGNAL(activated()), ui->pushButton_Calculate, SLOT(click()));@

                      Thank you all very much for your help!

                      C 1 Reply Last reply
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                      • F fs_tigre

                        I found my problem, I had my code in the wrong place.

                        This is the code that worked.
                        @QShortcut *returnShortcut = new QShortcut(QKeySequence("Return"), ui->groupBox);
                        QObject::connect(returnShortcut, SIGNAL(activated()), ui->pushButton_Calculate, SLOT(click()));@

                        Thank you all very much for your help!

                        C Offline
                        C Offline
                        crates
                        wrote on last edited by
                        #20

                        @fs_tigre great!!

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