PyQT: qt.qApp

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  • Axel Mittendorf
    #1

    PyQT: qt.qApp

    Hello,
    in my application I want to subclass qt.QApplication and
    use this subclass instead of QApplication for my gui. Some
    of my modules are automatically generated by pyuic and
    I am not allowed to change their source code. The problem
    is these modules do "from qt import *" and use an object
    called 'qApp' which seems to be an instance of qt.QApplication
    and I want them to use my subclass (exactly its instance)
    instead of 'qApp'. How can I solve this?

    Can someone tell me what qt.qApp is and what it is used for?
    (I'm using PyQT 3.6.)

    TIA,
    Axel


    Tags: None
    • John J. Lee
      #2
      Re: PyQT: qt.qApp

      "Axel Mittendorf" <newsreply@tran sfertech.de> writes:
      [...][color=blue]
      > in my application I want to subclass qt.QApplication and
      > use this subclass instead of QApplication for my gui. Some
      > of my modules are automatically generated by pyuic and
      > I am not allowed to change their source code. The problem
      > is these modules do "from qt import *" and use an object
      > called 'qApp' which seems to be an instance of qt.QApplication[/color]

      IIRC, qApp is *the* QApplication (there's only one QApplication
      instance per application).

      [color=blue]
      > and I want them to use my subclass (exactly its instance)
      > instead of 'qApp'. How can I solve this?[/color]

      I have a vague recollection that you can't, due to an obscure
      limitation of either Qt or PyQt (or sip, maybe). That might have
      changed by now, though: ask on the PyKDE list.

      [color=blue]
      > Can someone tell me what qt.qApp is and what it is used for?
      > (I'm using PyQT 3.6.)[/color]

      See above.


      John

        Comment

        • Roberto Alsina
          #3
          Re: PyQT: qt.qApp

          "Axel Mittendorf" <newsreply@tran sfertech.de> wrote in message news:<bu3pph$qm a$01$1@news.t-online.com>...[color=blue]
          > Hello,
          > in my application I want to subclass qt.QApplication and
          > use this subclass instead of QApplication for my gui. Some
          > of my modules are automatically generated by pyuic and
          > I am not allowed to change their source code. The problem
          > is these modules do "from qt import *" and use an object
          > called 'qApp' which seems to be an instance of qt.QApplication
          > and I want them to use my subclass (exactly its instance)
          > instead of 'qApp'. How can I solve this?
          >
          > Can someone tell me what qt.qApp is and what it is used for?
          > (I'm using PyQT 3.6.)[/color]

          Well, there are some times when you need to call a method of
          QApplication.

          For example, if you want to put a hourglass cursor for the whole app,
          you call
          qApp.setOverrid eCursor

          Anyway, you shouldn´t worry about this. Whatever object you create
          that inherits QApplication will be qApp. Since there can only be one
          of those, there is no way it´s gonna get confused ;-)

          --
          Roberto Alsina

            Comment

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