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Setters and getters(for using pixmap of one class in another)

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  • p3c0P Offline
    p3c0P Offline
    p3c0
    Moderators
    wrote on last edited by
    #4

    Yes thats what i'm talking you checked inside the set function but did you checked after the get function ?
    In this case after,
    @OpacityViewStationaryPixmap_=StationaryImageViewerObject.getStationaryImagePixmap();@

    check

    @OpacityViewStationaryPixmap_.isNull();@

    157

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    • p3c0P Offline
      p3c0P Offline
      p3c0
      Moderators
      wrote on last edited by
      #5

      Or you are checking for
      @OpacityViewMovingPixmap_=MovingImageViewerObject.getMovingImagePixmap();@
      Try after that the null condition.

      157

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      • N Offline
        N Offline
        NicuPopescu
        wrote on last edited by
        #6

        Hi,

        beside checking if pixmap is null you could print out MovingImagePath_ ... may be there is something wrong with the item's data and conversion from QVariant?

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        • V Offline
          V Offline
          venkatesh
          wrote on last edited by
          #7

          Hi,

          Hey i found that the pixmap is empty.Why is this happening?. What am i doing wrong in the getter function?I think there is no problem in the items conversion as i could display the image in the original class which is setMovingImage(...)but not when i return it and access it in another class. I think some how the pixmap becomes null when i return it.

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          • N Offline
            N Offline
            NicuPopescu
            wrote on last edited by
            #8

            have a look at "Implicit Data Sharing ":http://qt-project.org/doc/qt-5.0/qtcore/implicit-sharing.html

            even though it seems it should work you could try to use copy() instead of =operator which according to doc does not do a deep copy of pixmap data but just returns a reference untill a paint event occurs on the QPixmap object getting the reference

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            • V Offline
              V Offline
              venkatesh
              wrote on last edited by
              #9

              Hey the link is not opening i don't know why. How can i use the copy()it needs some parameters which i don't use in my program. But i am puzzled why doesn't my pixmap contain the image and why is it null?..

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              • V Offline
                V Offline
                venkatesh
                wrote on last edited by
                #10

                Hi,
                I am sure the problem is with the getData(); i think the other class which receives the pixmap is not receiving the data. Is the problem with the object created in overlayview?

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                • V Offline
                  V Offline
                  venkatesh
                  wrote on last edited by
                  #11

                  Hi,
                  I found out that the object created @StationaryImageViewerObject@ has no information, as i didn't connect it with the @StationaryImageViewer@ though i have created the object i learnt i need to connect it with the StationaryImageViewer class, I am not so sure how to do it but. Would be privileged to have any of your guidances

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                  • N Offline
                    N Offline
                    NicuPopescu
                    wrote on last edited by
                    #12

                    @ StationaryImageViewer StationaryImageViewerObject;@

                    StationaryImageViewerObject is of type StationaryImageViewer ... how do you mean by connecting them?

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                    • V Offline
                      V Offline
                      venkatesh
                      wrote on last edited by
                      #13

                      Hi,
                      The problem is though i have created a object of the class. But i don't know how to make the Qt understand that i am pointing to the particular class.

                      will this help

                      @
                      StationaryImageViewer StationaryImageViewer;
                      @
                      ?

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                      • N Offline
                        N Offline
                        NicuPopescu
                        wrote on last edited by
                        #14

                        and btw I have tested returning QPixmap from a function, passing as value or copying by = operator and all work just fine! you're doing something wrong elsewhere :)

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                        • V Offline
                          V Offline
                          venkatesh
                          wrote on last edited by
                          #15

                          The problem is it doesn't know which class i am calling, though i am creating an object of the class. It's not getting connected to the class. I am not really sure why is this happening though :(

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                          • N Offline
                            N Offline
                            NicuPopescu
                            wrote on last edited by
                            #16

                            bq. Hi,
                            The problem is though i have created a object of the class. But i don’t know how to make the Qt understand that i am pointing to the particular class.
                            will this help
                            StationaryImageViewer StationaryImageViewer;

                            ?

                            this phrase reveals more about your c++/qt understanding: I think you are still confusing a class type with its instance (in memory created object, static or dynamic) etc. ... better for you to review some c++ stuffs ... qt does not understand anything it's a framework, you could say the compiler does

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                            • V Offline
                              V Offline
                              venkatesh
                              wrote on last edited by
                              #17

                              Hmmm, my problem here is how to exactly make the compiler know that i am pointing to the specific class?

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