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Restrict mouse cursor movement

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  • mrjjM mrjj

    Hi
    Do you mean something like this windows function but crossplatform ?
    https://msdn.microsoft.com/en-us/library/windows/desktop/ms648383(v=vs.85).aspx

    And Mainwindow cannot just be fullscreen?

    kshegunovK Offline
    kshegunovK Offline
    kshegunov
    Moderators
    wrote on last edited by
    #3

    Hello,

    Do you mean something like this windows function but crossplatform?

    Yes I mean it exactly like that.

    And Mainwindow cannot just be fullscreen?

    It is in a pseudo full screen because of a bug in Qt (I have opengl widget embeded that prevents full screen from working properly). Additionally, even if put in full screen the cursor is not clipped to an area, because there are multiple screens, so Qt allows the cursor to escape (which is of course an expected behavior).

    Kind regards.

    Read and abide by the Qt Code of Conduct

    1 Reply Last reply
    0
    • mrjjM mrjj

      Hi
      Do you mean something like this windows function but crossplatform ?
      https://msdn.microsoft.com/en-us/library/windows/desktop/ms648383(v=vs.85).aspx

      And Mainwindow cannot just be fullscreen?

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

      Ok.
      I didn't find any good way.
      I tried using MouseMoveEvent + mousetracking
      but if you moved the mouse really fast
      it would not detect leaving the window.

      kshegunovK 1 Reply Last reply
      0
      • R Offline
        R Offline
        Rahul Sharma
        wrote on last edited by
        #5

        @kshegunov said:

        may be you can get some information from this-
        http://www.codeprogress.com/cpp/libraries/qt/QtHideMouseCursor.php

        1 Reply Last reply
        0
        • mrjjM mrjj

          Ok.
          I didn't find any good way.
          I tried using MouseMoveEvent + mousetracking
          but if you moved the mouse really fast
          it would not detect leaving the window.

          kshegunovK Offline
          kshegunovK Offline
          kshegunov
          Moderators
          wrote on last edited by
          #6

          @mrjj
          Right? Me neither. The only thing I could fathom was to grab the mouse, but then my child widgets don't get anything. Maybe I could manually dispatch the messages, but it does seem weird.

          @Rahul-Sharma
          Sorry, but does me no good. I'm not after changing the cursor image, but disallowing it to leave a certain area instead. Thanks for the suggestion, though.

          Read and abide by the Qt Code of Conduct

          mrjjM 1 Reply Last reply
          0
          • kshegunovK kshegunov

            @mrjj
            Right? Me neither. The only thing I could fathom was to grab the mouse, but then my child widgets don't get anything. Maybe I could manually dispatch the messages, but it does seem weird.

            @Rahul-Sharma
            Sorry, but does me no good. I'm not after changing the cursor image, but disallowing it to leave a certain area instead. Thanks for the suggestion, though.

            mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #7

            @kshegunov
            Not sure how much worked there is to self dispatch messages.
            My use case for for demo to disallow people go clicking on other tings, so i ended up
            with timer, moving the mouse back if it has moved outside.
            While not limiting it for real. it was impossible to click on stuff outside.
            Still not a good solution but fine for the 2 hours demo.

            What is your use case`? if i may ask.

            kshegunovK 1 Reply Last reply
            0
            • mrjjM mrjj

              @kshegunov
              Not sure how much worked there is to self dispatch messages.
              My use case for for demo to disallow people go clicking on other tings, so i ended up
              with timer, moving the mouse back if it has moved outside.
              While not limiting it for real. it was impossible to click on stuff outside.
              Still not a good solution but fine for the 2 hours demo.

              What is your use case`? if i may ask.

              kshegunovK Offline
              kshegunovK Offline
              kshegunov
              Moderators
              wrote on last edited by
              #8

              @mrjj
              Sure, I don't like secrets, that's why I prefer Linux ;P
              It's for my pet project - a proof of concept Qt based game. I think I've mentioned it to you. I need to restrict the mouse from leaving the main window, because there is an action I wish to attach to certain area near the edges of the window, namely to allow the player to move around the world with the mouse.

              Read and abide by the Qt Code of Conduct

              mrjjM 1 Reply Last reply
              0
              • kshegunovK kshegunov

                @mrjj
                Sure, I don't like secrets, that's why I prefer Linux ;P
                It's for my pet project - a proof of concept Qt based game. I think I've mentioned it to you. I need to restrict the mouse from leaving the main window, because there is an action I wish to attach to certain area near the edges of the window, namely to allow the player to move around the world with the mouse.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by mrjj
                #9

                @kshegunov
                hehe.
                Yes you mentioned pet :)
                So In reality if opengl would go fullscreen it would just work.
                Else I think grab is the best option.

                1 Reply Last reply
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                • Chris KawaC Offline
                  Chris KawaC Offline
                  Chris Kawa
                  Lifetime Qt Champion
                  wrote on last edited by
                  #10

                  Some games do it this way:

                  • Hide the cursor (set to Qt::BlankCursor)
                  • In mouse move event record a distance of the cursor from the center of your window (QCursor::pos() and window geometry). Use that distance to update your "virtual cursor" clipped to whatever region you want.
                  • Move the cursor to the center of your window
                  • Draw your own cursor "in game" at the "virtual" position

                  In mouse clicks use your "virtual" position instead of the real one. If you also need to pass the moves to some widgets etc. then you can filter your window for mouse clicks, intercept and resend the events with your "virtual" position.

                  kshegunovK 1 Reply Last reply
                  0
                  • Chris KawaC Chris Kawa

                    Some games do it this way:

                    • Hide the cursor (set to Qt::BlankCursor)
                    • In mouse move event record a distance of the cursor from the center of your window (QCursor::pos() and window geometry). Use that distance to update your "virtual cursor" clipped to whatever region you want.
                    • Move the cursor to the center of your window
                    • Draw your own cursor "in game" at the "virtual" position

                    In mouse clicks use your "virtual" position instead of the real one. If you also need to pass the moves to some widgets etc. then you can filter your window for mouse clicks, intercept and resend the events with your "virtual" position.

                    kshegunovK Offline
                    kshegunovK Offline
                    kshegunov
                    Moderators
                    wrote on last edited by kshegunov
                    #11

                    @Chris-Kawa
                    Thanks for the suggestions, I'll think about it. They all seem to revolve around remapping the cursor, which I'm not sure will work for me, because I have Qt3D put into a QOpenGLWindow and it handles the mouse events itself. Still, thank you again for taking the time.

                    Kind regards.

                    Read and abide by the Qt Code of Conduct

                    kshegunovK 1 Reply Last reply
                    0
                    • kshegunovK kshegunov

                      @Chris-Kawa
                      Thanks for the suggestions, I'll think about it. They all seem to revolve around remapping the cursor, which I'm not sure will work for me, because I have Qt3D put into a QOpenGLWindow and it handles the mouse events itself. Still, thank you again for taking the time.

                      Kind regards.

                      kshegunovK Offline
                      kshegunovK Offline
                      kshegunov
                      Moderators
                      wrote on last edited by
                      #12

                      Hello,
                      It turned out to be incredibly simple in the end. There is a leave event (that was news for me) fired from Qt, to which it's possible to attach the necessary code (for anyone that might come to the same issue):

                      void MyMainWindow::leaveEvent(QEvent * event)
                      {
                      	// Get the window geometry & cursor position
                      	const QRect & rect = geometry();
                      	QPoint position = QCursor::pos();
                      
                      	// Check the bounds
                      	qint32 x = qBound(rect.left(), position.x(), rect.right());
                      	qint32 y = qBound(rect.top(), position.y(), rect.bottom());
                      
                      	// Adjust the cursor
                      	if (x != position.x() || y != position.y())
                      		QCursor::setPos(x, y);
                      
                      	event->accept();
                      	QMainWindow::leaveEvent(event);
                      }
                      

                      Thanks to all for the help.

                      Kind regards.

                      Read and abide by the Qt Code of Conduct

                      1 Reply Last reply
                      4
                      • mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #13

                        Ok, that i completely missed it had :)

                        1 Reply Last reply
                        0
                        • W Offline
                          W Offline
                          wuzn
                          wrote on last edited by JKSH
                          #14

                          more cursors

                          [EDIT: Irrelevant link removed --JKSH]

                          1 Reply Last reply
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