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i want to call an auto call event which gets calls automatically after any control or widget get changed

  • Here i am using QGraphicsview control to add line .
    line is added using QGraphicsLine through mouse move event, and press event,
    but i want to do operation after any image is inserted into view contrl.
    in Windows Visual Studio System paint event is called every time whenever any control has been changed

  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Since you are inserting the image yourself, why not start something from the function where you add the image to the QGraphicsView ?

  • Moderators

    for a system (Qt-wise) wide notification you can create your own custom event and post it to the QApplication.
    Then any other object/widget can read these events (by installing an event filter on the QApplication instance)

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