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Thread: Display own widget in new window

  1. #1
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    Question Display own widget in new window

    Hi.
    I want to do, when I click pushButton it should show new window with my widget (pie chart)

    I have something like this

    Qt Code:
    1. MainWindow::on_PieChart1_pushButton_clicked()
    2. {
    3. QPieSeries *series = new QPieSeries();
    4. series->append("Jane", 1);
    5. series->append("Joe", 2);
    6. series->append("Andy", 3);
    7. series->append("Barbara", 4);
    8. series->append("Axel", 5);
    9.  
    10. QPieSlice *slice = series->slices().at(1);
    11. slice->setExploded();
    12. slice->setLabelVisible();
    13. slice->setPen(QPen(Qt::darkGreen, 2));
    14. slice->setBrush(Qt::green);
    15.  
    16. QChart *chart = new QChart();
    17. chart->addSeries(series);
    18. chart->setTitle("Simple piechart example");
    19. chart->legend()->hide();
    20.  
    21. QChartView *chartView = new QChartView(chart);
    22. chartView->setRenderHint(QPainter::Antialiasing);
    23.  
    24. //here I need to make new window and put chartView inside
    25. }
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    So how to write it, to show new window with my pie chart when I click the push button?

    I know you can use setCentralWidget(QWidget *widget) but it works only with mainWindow. I need it in new window. Any ideas?
    Last edited by time; 21st November 2016 at 22:21.

  2. #2
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    Default Re: Display own widget in new window

    Qt Code:
    1. chartView->show();
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    Of course, what you are doing leaks memory for the QChartView. And since you create your QChartView without a parent, it is a top-level window and probably won't appear where you want it to.

    If that isn't the behavior you want, then you'll have to explain what should happen when the new chart is displayed.
    Last edited by d_stranz; 22nd November 2016 at 02:27.
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  3. #3
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    Default Re: Display own widget in new window

    Quote Originally Posted by d_stranz View Post
    Of course, what you are doing leaks memory for the QChartView.
    So, of course I do not want memory leaks. I should use the delete chartView somewhere near end of function?

  4. #4
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    Default Re: Display own widget in new window

    I should use the delete chartView somewhere near end of function?
    No. If you don't want a memory leak, then create the QChartView with the MainWindow as a parent. The chart view will then be deleted when the main window is deleted, whether the chart view is visible or not.
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

  5. #5
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    Default Re: Display own widget in new window

    Quote Originally Posted by d_stranz View Post
    No. If you don't want a memory leak, then create the QChartView with the MainWindow as a parent. The chart view will then be deleted when the main window is deleted, whether the chart view is visible or not.
    Oh, ok. Can I ask you for simple example how to do that? How to create QChartView as a parent of MainWindow?

  6. #6
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    Default Re: Display own widget in new window

    How to create QChartView as a parent of MainWindow?
    No, no. Your QChartView should be a child of MainWindow. See that there are two QChartView constructors; in Line 21 of your code above use the one that takes a QWidget * parent argument and use "this" (your MainWindow instance) as the value for "parent".
    <=== The Great Pumpkin says ===>
    Please use CODE tags when posting source code so it is more readable. Click "Go Advanced" and then the "#" icon to insert the tags. Paste your code between them.

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