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Thread: Copy of QPalette modifies original

  1. #1
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    Question Copy of QPalette modifies original

    Question of comprehension

    I would like to temporarily change the text color in the StatusBar.

    Question is, why does the original palette change after the modified palette has been assigned to the StatusBar?

    I already know how to solve this by simply resetting the color.

    Qt Code:
    1. const QPalette& palOrg = statusBar()->palette();
    2.  
    3. QPalette palCopy = palOrg;
    4.  
    5. palCopy.setColor(QPalette::WindowText, Qt::red);
    6.  
    7. qDebug() << palCopy.color(QPalette::WindowText) << palOrg.color(QPalette::WindowText);
    8. //logs QColor(ARGB 1, 1, 0, 0) QColor(ARGB 1, 0, 0, 0)
    9.  
    10. statusBar()->setPalette(palCopy);
    11.  
    12. qDebug() << palCopy.color(QPalette::WindowText) << palOrg.color(QPalette::WindowText);
    13. //logs QColor(ARGB 1, 1, 0, 0) QColor(ARGB 1, 1, 0, 0)
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  2. #2
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    Default Re: Copy of QPalette modifies original

    Hi, I think it's because statusBar()->palette() returns a QPalette&. So "palOrg" references the internal QPalette object of the status bar, and since it's a reference it reflects all changes made to the object it "points" to.

    Ginsengelf

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