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Forum Update on Tuesday, May 27th 2025

[Solved] Animation of cursor on touch

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touchtouchscreenanimationembedded linux
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  • M Offline
    M Offline
    McLion
    wrote on 29 Apr 2015, 06:58 last edited by
    #6

    Thanks for answering. Yes, it is. While playing around I had a too large pixmap. It then did throw an error on the console.
    Just found: To make it run I had to place a
    QApplication::processEvents();
    after the setOverrideCursor. This is probably only needed because I placed it in the MainWindow constructor for testing purpose. I will move it to the notify reimplementation where I catch the mouse and keyboard events and then would probably not need it.

    Is there a way to have at least a gray scaled or even colored cursor, maybe bigger than the current maximum of 64x64?

    If not, I'll probably have to implement a workaround like showing a graphic for a short time at the location of the touch/click event.
    Would that support an animated gif, with transparency?
    Do you have a better suggestion?

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    • M Offline
      M Offline
      McLion
      wrote on 29 Apr 2015, 13:07 last edited by
      #7

      Got stuck :-|
      I seem not to be able to call a function in my class
      class QTGUI_MainWindow : public QMainWindow
      from the reimplementation of the notify event:

      class MyApplication : public QApplication
      {
        public:
          MyApplication(int &argc, char **argv ) : QApplication(argc, argv)
          {
          }
          virtual bool notify ( QObject *receiver, QEvent *event )
             switch( event->type() )
            {
      ....
      

      There's something I just don't get with these classes in C++ - still used to years of ANSI C.
      Can somebody give me a hint how I can solve this?
      Tanks a lot.

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      • S Offline
        S Offline
        SGaist
        Lifetime Qt Champion
        wrote on 30 Apr 2015, 22:16 last edited by
        #8

        Do you mean your notify implementation doesn't get called ?

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • M Offline
          M Offline
          McLion
          wrote on 1 May 2015, 07:36 last edited by
          #9

          Nope, it's called and working perfectly.
          I can perfectly manipulate the cursor with these lines from the notifier:

          QPixmap TouchEventCursorPixmap(":/Ring3");
          QCursor TouchEventCursor(TouchEventCursorPixmap, -1, -1);
          QApplication::setOverrideCursor(QCursor(TouchEventCursor));
          

          Because the problem I got stuck with is actually something different than the main topic of this thread I opened a new one for this here

          What is remaining open in this thread is the following:
          Is there a way to have at least a gray scaled or even colored cursor, maybe bigger than the current maximum of 64x64?
          If not, I'll probably have to implement a workaround like showing a graphic for a short time at the location of the touch/click event.
          Would that support an animated gif, with transparency?
          Do you have a better suggestion?

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          • S Offline
            S Offline
            SGaist
            Lifetime Qt Champion
            wrote on 1 May 2015, 23:16 last edited by
            #10

            I don't think it is, however if you need that big a feedback, you should maybe avoid trying to do it on the cursor and have something more general like a spinner in a corner

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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            • M Offline
              M Offline
              McLion
              wrote on 4 May 2015, 07:58 last edited by
              #11

              Couldn't find anything either.
              For now, I leave it with the cursor solution. And I'll try to let a graphic pop up at the cursor location instead of changing the cursor as an option.

              Thanks anyway.

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              • M Offline
                M Offline
                McLion
                wrote on 19 Jun 2015, 12:20 last edited by McLion
                #12

                Need to dig up this old thread ...

                I (customer) would like to have graphic shown instead of the simple over-ridden cursor.
                I am thinking of a png with transparency or even of an animated gif.

                What is the best approach to have a small graphic shown very quickly (load fast)?

                Something like this maybe:

                QGraphicsScene scene;
                QGraphicsView view(&scene);
                QGraphicsPixmapItem item(QPixmap("c:\\test.png"));
                scene.addItem(&item);
                view.show();
                

                I'd load the graphic at boot and later only show and hide at the relevant position.
                Or is there a faster or better way?

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                • S Offline
                  S Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on 19 Jun 2015, 21:37 last edited by
                  #13

                  At a fixed position ?

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • M Offline
                    M Offline
                    McLion
                    wrote on 22 Jun 2015, 09:01 last edited by
                    #14

                    Nope, varying with current touch position.
                    Couldn't get to display that graphic, and not frameless with the Scene. Tried with a QLabel instead .. again to no avail.

                    Ended up in adding a Label in the Designer and set it transparent in Designer and load the png in Designer. From code, I am now only updating the position and show and hide.
                    This now works as expected for a static image. I wonder if this also works with an animated GIF ... will see.

                    Thanks anyway

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                    • S Offline
                      S Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on 22 Jun 2015, 21:19 last edited by
                      #15

                      IIRC, you can use QMovie for gifs

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • M Offline
                        M Offline
                        McLion
                        wrote on 23 Jun 2015, 07:25 last edited by
                        #16

                        I'll try that.
                        Thanks

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