Widget Transparency

[arunpk]

Hi all....
I am also having problem with the Transparency...
I have a parent widget with some background color... And i have two child widgets which i am placing over my parent widget. In this i am placing one child widget over another. And the first child widget which is below the second child should be partially visible means i need my second child widget as semi transparent. I can set the transparency for individual widget. But when i am setting this as a child of another widget i am not able to accomplish that transparency...


Please help me regarding this.. Here i have a dded one image..On that you can see what i really need.....

Thanks in advance...

[mentalmushroom]

I remember I had a similar problem in the past and have not found a qt solution. I've managed to achieve transparency only with win32 code:

#ifdef Q_OS_WIN32
   HWND hwnd = (HWND) winId(); // get handle of the widget
   LONG styles = GetWindowLong(hwnd, GWL_EXSTYLE);
   SetWindowLong(hwnd, GWL_EXSTYLE, styles | WS_EX_TRANSPARENT);	
#else

#ifdef Q_OS_WIN32
   HWND hwnd = (HWND) winId(); // get handle of the widget
   LONG styles = GetWindowLong(hwnd, GWL_EXSTYLE);
   SetWindowLong(hwnd, GWL_EXSTYLE, styles | WS_EX_TRANSPARENT);	
#else

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After this transparency should work. Big thanks to anybody who can provide a better way to do this.

[Spitfire]

I'm not sure if I understood you right, but if you want your widget background to be transparent it's quite simple:

MainWindow::MainWindow( QWidget*  p )
    :
    QMainWindow( p )
{
    QWidget* w1 = new QWidget( this );
    w1->setFixedSize( 100, 100 );
    w1->setStyleSheet( "background: rgba(255, 0, 0, 127);" ); // 50% transparent
 
    QLabel* l = new QLabel( "test test test1", w1 );
    l->move( 0, 80 );
    l->setStyleSheet( "background: none;" ); // remove inherited background
 
    QWidget* w2 = new QWidget( this );
    w2->setFixedSize( 100, 100 );
    w2->move( 50, 50 );
    w2->setStyleSheet( "background: rgba(0, 255, 0, 127);" ); // 50% transparent
 
    w1->show();
    w2->show();
}

MainWindow::MainWindow( QWidget*  p )
    :
    QMainWindow( p )
{
    QWidget* w1 = new QWidget( this );
    w1->setFixedSize( 100, 100 );
    w1->setStyleSheet( "background: rgba(255, 0, 0, 127);" ); // 50% transparent

    QLabel* l = new QLabel( "test test test1", w1 );
    l->move( 0, 80 );
    l->setStyleSheet( "background: none;" ); // remove inherited background

    QWidget* w2 = new QWidget( this );
    w2->setFixedSize( 100, 100 );
    w2->move( 50, 50 );
    w2->setStyleSheet( "background: rgba(0, 255, 0, 127);" ); // 50% transparent

    w1->show();
    w2->show();
}

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This transparency applies only to widget background, so ie button will still be 100% opaque.
Is that what you needed?
transparency.png