Custom Widget inside a QVboxLayout

I have a strange behaviour here.
I have made a custom widget (qt3). It uses double buffer: a timer event fills a pixmap and then calls repaint(). Then a paintEvent copies the pixmap into the visible area.

The widget works if used standalone without problems.
I'm trying to make a bettere interface using a QVBoxLayout.
I have used q3-designer and I vave made a simple form with a QVBoxLayout and two widgets inside.
Then I modified the code adding manually the code for my widget.. I created an instance and added in the middle.
The problem is that I cannot see this widget. I can see both the labels up and down (they are much big... like they have stretched to fill all the space).
Nothing in the middle.

I have added some debug messages inside the timer event and it is correctly called. I have added the same messages on the paintEvent and I discovered that it is never called!!

It's like the two labels fill all the space and nothing needs to be painted for my widget.

More... I have given an implementation to sizeHint e minimumSizeHint in order to return a 640,400 Qsize.

I have lost a day with this problem :crying:
Can you give me a solution?

Thanks a lot!

If you replace you custom widget with a button or other standard widget, can you see it?

Yes, If I use standard widgets I can see all of them!

DId u add the widget to the layout ??
May be thats why its not showing and not receving paint events :)

Quote:

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Originally Posted by nemesis

Yes, If I use standard widgets I can see all of them!

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Hmm... What are the values of sizePolicy and minimumSize properties?

I have solved the problem!!!

Here was the code before I fixed it:

Code:

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QWidget* privateLayoutWidget = new QWidget( this, "layout2" );
    privateLayoutWidget->setGeometry( QRect( 0, 0, 642, 400 ) );
    layout2 = new QVBoxLayout( privateLayoutWidget, 11, 6, "layout2");
 
    textLabel3 = new QLabel( privateLayoutWidget, "textLabel3" );
    textLabel3->setMinimumSize( QSize( 640, 16 ) );
    textLabel3->setAlignment( int( QLabel::AlignCenter ) );
    layout2->addWidget( textLabel3 );
 
    plt = new plotter();
    layout2->addWidget( plt);

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I did not set the parent when I created the plotter instance.
I corrected this code to:

Code:

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QWidget* privateLayoutWidget = new QWidget( this, "layout2" );
    privateLayoutWidget->setGeometry( QRect( 0, 0, 642, 400 ) );
    layout2 = new QVBoxLayout( privateLayoutWidget, 11, 6, "layout2");
 
    textLabel3 = new QLabel( privateLayoutWidget, "textLabel3" );
    textLabel3->setMinimumSize( QSize( 640, 16 ) );
    textLabel3->setAlignment( int( QLabel::AlignCenter ) );
    layout2->addWidget( textLabel3 );
 
    plt = new plotter(privateLayoutWidget);
    plt->setMinimumSize(640,200);
    layout2->addWidget( plt);

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And now it works!
I'm reading some texts to know why is it necessary to specify the parent widget...

Thanks a lot!