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QMouseEvent on button click

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qmouseevent
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  • U uruloke

    @mrjj Thank you @mrjj.
    It was this line here I had trouble with defining myself
    QPoint p = mapFromGlobal(QCursor::pos());

    mrjjM Offline
    mrjjM Offline
    mrjj
    Lifetime Qt Champion
    wrote on last edited by mrjj
    #4

    @uruloke
    well also I forgot to mention
    to use QMouseEvent
    you would override
    void mousePressEvent(QMouseEvent *eventPress);
    for the widget.
    like here
    http://doc.qt.io/qt-5/qtwidgets-widgets-scribble-example.html

    U 1 Reply Last reply
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    • mrjjM mrjj

      @uruloke
      well also I forgot to mention
      to use QMouseEvent
      you would override
      void mousePressEvent(QMouseEvent *eventPress);
      for the widget.
      like here
      http://doc.qt.io/qt-5/qtwidgets-widgets-scribble-example.html

      U Offline
      U Offline
      uruloke
      wrote on last edited by uruloke
      #5

      @mrjj
      Okay, so Qcursor works for me, but I cannot get QMouseEventto work correctly.

      void MainWindow::on_screen2Button_clicked(QMouseEvent *eventPress) { QPoint p = mapFromGlobal(eventPress->globalPos()); ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.x())); }
      It doesn't give me any errors, but it doesn't print the text out either, it worked with Qcursor though

      EDIT 1:
      cool, will look into the example.

      mrjjM 1 Reply Last reply
      0
      • U uruloke

        @mrjj
        Okay, so Qcursor works for me, but I cannot get QMouseEventto work correctly.

        void MainWindow::on_screen2Button_clicked(QMouseEvent *eventPress) { QPoint p = mapFromGlobal(eventPress->globalPos()); ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.x())); }
        It doesn't give me any errors, but it doesn't print the text out either, it worked with Qcursor though

        EDIT 1:
        cool, will look into the example.

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #6

        @uruloke
        you have to add

        protected:
        void mousePressEvent(QMouseEvent *eventPress);

        to mainwindow .H
        and
        void mousePressEvent(QMouseEvent *eventPress) {
        }
        in .cpp

        its a virtual function and must be named like this.
        It will then be called by system.
        What you seems to try is to put MouseEvent *eventPress to a button click.
        and it will be zero as it not filled out by system since a buttons click is not the same as mouse click.
        so you sort of give it a empty QMouseEvent.

        Note its protected: that is important.

        U 1 Reply Last reply
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        • mrjjM mrjj

          @uruloke
          you have to add

          protected:
          void mousePressEvent(QMouseEvent *eventPress);

          to mainwindow .H
          and
          void mousePressEvent(QMouseEvent *eventPress) {
          }
          in .cpp

          its a virtual function and must be named like this.
          It will then be called by system.
          What you seems to try is to put MouseEvent *eventPress to a button click.
          and it will be zero as it not filled out by system since a buttons click is not the same as mouse click.
          so you sort of give it a empty QMouseEvent.

          Note its protected: that is important.

          U Offline
          U Offline
          uruloke
          wrote on last edited by
          #7

          @mrjj
          Ah so if I want it to run when a mouse is pressed I just have to run the mousePressEvent(QMouseEvent *eventPress)inside my onButtonClicked event?

          mrjjM 1 Reply Last reply
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          • U uruloke

            @mrjj
            Ah so if I want it to run when a mouse is pressed I just have to run the mousePressEvent(QMouseEvent *eventPress)inside my onButtonClicked event?

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #8

            @uruloke
            well Im not sure I understand.
            Why dont you just run when button is clicked ?

            mousePressEvent is for click on some spot on mainwindow where no control.

            Dont call the mousePressEvent your self. system call it.

            U 1 Reply Last reply
            0
            • mrjjM mrjj

              @uruloke
              well Im not sure I understand.
              Why dont you just run when button is clicked ?

              mousePressEvent is for click on some spot on mainwindow where no control.

              Dont call the mousePressEvent your self. system call it.

              U Offline
              U Offline
              uruloke
              wrote on last edited by
              #9

              @mrjj
              Ah, yeah I forgot that it was an event :)

              void mousePressEvent(QMouseEvent *eventPress) { QPoint p = mapFromGlobal(eventPress->globalPos()); ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.x())); }

              I get errors on mapFromGlobal now and ui, didn't get that before.

              mrjjM 1 Reply Last reply
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              • U uruloke

                @mrjj
                Ah, yeah I forgot that it was an event :)

                void mousePressEvent(QMouseEvent *eventPress) { QPoint p = mapFromGlobal(eventPress->globalPos()); ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.x())); }

                I get errors on mapFromGlobal now and ui, didn't get that before.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #10

                @uruloke
                try with

                eventPress->pos().x();
                eventPress->pos().y();

                and no mapFromGlobal

                oh and make sure its maiwindow::mousePressEvent(...) else it wont compile
                if you are in the .cpp file.

                U 1 Reply Last reply
                1
                • mrjjM mrjj

                  @uruloke
                  try with

                  eventPress->pos().x();
                  eventPress->pos().y();

                  and no mapFromGlobal

                  oh and make sure its maiwindow::mousePressEvent(...) else it wont compile
                  if you are in the .cpp file.

                  U Offline
                  U Offline
                  uruloke
                  wrote on last edited by
                  #11

                  @mrjj
                  thanks a lot for the help.
                  It was just the mapFromGlobal that fucked it up.
                  It worked when I removed that.

                  QPoint p = eventPress->globalPos();
                  ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.y()));

                  mrjjM 1 Reply Last reply
                  0
                  • U uruloke

                    @mrjj
                    thanks a lot for the help.
                    It was just the mapFromGlobal that fucked it up.
                    It worked when I removed that.

                    QPoint p = eventPress->globalPos();
                    ui->pixMap->setText( QString::number(p.x()) + "," + QString::number(p.y()));

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #12

                    @uruloke
                    ok.super.

                    Can I ask what you are programming ?

                    U 1 Reply Last reply
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                    • mrjjM mrjj

                      @uruloke
                      ok.super.

                      Can I ask what you are programming ?

                      U Offline
                      U Offline
                      uruloke
                      wrote on last edited by
                      #13

                      @mrjj Sure, I am making a program to take screenshots with. So I need the mouse global position to mark the area to screenshot.

                      mrjjM 1 Reply Last reply
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                      • U uruloke

                        @mrjj Sure, I am making a program to take screenshots with. So I need the mouse global position to mark the area to screenshot.

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #14

                        @uruloke
                        ahh. such beast. :)
                        make sure to borrow from
                        http://doc.qt.io/qt-5/qtwidgets-desktop-screenshot-example.html

                        U 1 Reply Last reply
                        0
                        • mrjjM mrjj

                          @uruloke
                          ahh. such beast. :)
                          make sure to borrow from
                          http://doc.qt.io/qt-5/qtwidgets-desktop-screenshot-example.html

                          U Offline
                          U Offline
                          uruloke
                          wrote on last edited by
                          #15

                          @mrjj
                          I will, thanks for everything :)

                          1 Reply Last reply
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