[Qt-interest] transparent widget can't have parent widget

[Denis Akhmetzyanov]

Hi,
As far as I know, attribute Qt::WA_TranslucentBackground is applicable to
the top-level widget only (i.e. without parent). The good reference for this
topic is Qt Quarterly http://doc.trolltech.com/qq/
*Issue 29 · Q1 2009, Translucent Widgets in Qt*


2010/5/19 cheng long <kevinclcn at gmail.com>

> I created a transparent QWinWidget and set the a CView as its parent, but
> the QWinWidget has an item in the task bar and it can be shown, hidden and
> closed regardless of the CView.
>
> Environment: Qt 4.5.2, Visual Studio 2008, Windows 7,
> Code:
>          QWinWidget* pQWinWidget = new QWinWidget(pWnd); // pWnd is a CView
> pointer
>          pQWinWidget->setWindowFlags(Qt::FramelessWindowHint);
>          pQWinWidget->setAttribute(Qt::WA_TranslucentBackground);
>
>          QHBoxLayout *pQHBoxLayout = new QHBoxLayout(pQWinWidget);
>          pQHBoxLayout->setMargin(0);
>
>          QGraphicsScene* scene = new QGraphicsScene();
>          QGraphicsView* view = new QGraphicsView(pQWinWidget);
>          pQHBoxLayout->addWidget(view);
>
>          view->setScene(scene);
>          view->setMinimumWidth(300);
>          view->setMinimumHeight(300);
>          view->setRenderHints(QPainter::Antialiasing |
> QPainter::TextAntialiasing);
>          view->setStyleSheet("background: transparent");
>
>          QGraphicsTextItem* text = new QGraphicsTextItem();
>          scene->addItem(text);
>          text->setPlainText("hello Qt!");
>
>          pQWinWidget->show();
>
> If I comment these two lines below, the QWinWidget will exist as the
> CView's child.
>          pQWinWidget->setWindowFlags(Qt::FramelessWindowHint);
>          pQWinWidget->setAttribute(Qt::WA_TranslucentBackground);
>
> Any suggestions?
>
> Thanks,
> Kevin
>
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>


-- 
Best regards,
Denis Akhmetzyanov
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