[SOLVED]Semi transparent widget

Sorin

I'm trying to implement a semitransparent widget. How should I make this? I've try with setWindowOpacity but didn'work. This is my code:

@#include<QApplication>
#include <QtGui>

class ChildWidget : public QLabel
{
public:
ChildWidget( QWidget* parent = 0 ) : QLabel( parent )
{
setWindowOpacity( 0.5 );
setStyleSheet( " background-color:blue " );
}
};

class ParentWidget : public QLabel
{
private:
ChildWidget* childWidget;
public:
ParentWidget( QWidget* parent = 0 ) : QLabel( parent )
{
setStyleSheet( " background-color:red " );
setFixedSize( 200, 200 );
childWidget = new ChildWidget( this );
childWidget->setGeometry( 0,0,100,200);
}
};

int main( int argc, char* argv[] )
{
QApplication a(argc, argv);
ParentWidget* parentWidget = new ParentWidget;
parentWidget->show();

return a.exec();
}@

goetz

You must call setWindowOpacity(0.5) on your toplevel widget (ParentWidget), not on the ChildWidget.

Also, you did not include the Q_OBJECT macros in your QLabel classes.

Franzk

[quote author="Volker" date="1292861432"]Also, you did not include the Q_OBJECT macros in your QLabel classes.[/quote]
No use of signals and slots or translation. No need to include those, really.

Sorin

I want only the ChildWidget to be semi transparent...

goetz

change things to this:

@

ChildWidget( QWidget* parent = 0 ) : QLabel( parent )
{
    QPalette pal = palette();
    pal.setBrush(QPalette::Window, QColor(0, 0, 255, 128) );
    setPalette(pal);
    setAutoFillBackground(true);
}



ParentWidget( QWidget* parent = 0 ) : QLabel( parent )
{
    QPalette pal = palette();
    pal.setBrush(QPalette::Window, Qt::red);
    setPalette(pal);

    setFixedSize( 200, 200 );
    setText("asdfa fladsf ldasfjdasfl asdflja sfljdsalfj");
    childWidget = new ChildWidget( this );
    childWidget->setGeometry( 0,0,100,200);
}

@

Although this does not create a full red with a light blue on top. Since the transparency adds the red of the parent widget to the blue of the child widget the resulting color is kind of purple/violet.

Sorin

Thanks, worked for my case, I just needed to see the ruler through my guide widget

goetz

As a rule of thumb: It's pretty hard if not impossible to mix widget stylesheets with regular styling (palette, etc.). One should stick to either the one or the other.