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Thread: paint central widget of a QMainWindow???

  1. #1
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    Default paint central widget of a QMainWindow???

    Below are the codes. so can any1 check them n tel tht is it the right way to paint(draw line n a point) on the central widget on a menu click event?[i think its not the right way, though its working]

    form.cpp

    form.h

    form.ui

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    Default Re: paint central widget of a QMainWindow???

    You should set an external central widget and paint on that widget and not on the main window itself.

    By the way, how is this question related to Qt Designer?

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    Default Re: paint central widget of a QMainWindow???

    Quote Originally Posted by wysota View Post
    You should set an external central widget and paint on that widget and not on the main window itself.
    so for this do i need QStackedWidget ? or simply a obj. of QWidget n set it as central widget???

    Quote Originally Posted by wysota View Post
    By the way, how is this question related to Qt Designer?
    sorry!! fm next time i wil take care..

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    Default Re: paint central widget of a QMainWindow???

    Quote Originally Posted by Shuchi Agrawal View Post
    so for this do i need QStackedWidget ? or simply a obj. of QWidget n set it as central widget???
    The central widget can be anything inheriting from QWidget, but I think Qt Designer restricts it to be a QWidget. Just create any custom widget, reimplement the paintEvent(), add corresponding widget in the Designer and promote it.

    As I have said previously:
    Quote Originally Posted by jpn View Post
    Override QWidget::paintEvent() for the widget you want to paint on and use QPainter to draw the line. For example, if you want to paint on the central widget in a main window, you must reimplement the paintEvent() for the central widget, not for the main window.
    So, in another words.
    WRONG: "void MyMainWindow::paintEvent(QPaintEvent* event)"
    CORRECT: "void MyCentralWidget::paintEvent(QPaintEvent* event)"
    J-P Nurmi

  5. The following user says thank you to jpn for this useful post:

    Shuchi Agrawal (18th January 2007)

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