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Handling changes in applications

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  • A Offline
    A Offline
    advseo32
    wrote on last edited by
    #1

    Hello ,

    i have a problem to figure out how people do to handle changes in their application

    for example when i make some change , add , delete , draw in the application and after that , i click in close

    button a Warrning message box will appear to informe me that i have some changes none saved

    i guess that people using globale variable , but i'm not sure what the right approche to use it

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    • sierdzioS Offline
      sierdzioS Offline
      sierdzio
      Moderators
      wrote on last edited by
      #2

      You indeed need to use some global state, usually a simple boolean value is enough. Usually this kind of property is referred to as the "dirty" flag.

      QWidget actually includes some helper convenience methods for you in this regard: see "this link":http://qt-project.org/doc/qt-5.0/qtwidgets/qwidget.html#windowModified-prop. You can use this (advantages: it's already there, and cross-platform), or implement your own.

      (Z(:^

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      • A Offline
        A Offline
        advseo32
        wrote on last edited by
        #3

        [quote author="sierdzio" date="1383393558"]You indeed need to use some global state, usually a simple boolean value is enough. Usually this kind of property is referred to as the "dirty" flag.

        QWidget actually includes some helper convenience methods for you in this regard: see "this link":http://qt-project.org/doc/qt-5.0/qtwidgets/qwidget.html#windowModified-prop. You can use this (advantages: it's already there, and cross-platform), or implement your own.[/quote]

        Yeah cool!!

        but really i don't know ,

        when my application contains many windows

        mainwindow, and window1,window2 ...etc . and there is somme

        changes happned in window2 or window1, how i can detect that one of

        this windows is the responsible for that change ?

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        • sierdzioS Offline
          sierdzioS Offline
          sierdzio
          Moderators
          wrote on last edited by
          #4

          Loop through all your windows and check their state with isWindowModified().

          (Z(:^

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