Issue with WA_TranslucentBackground again

[amonR]

Hi there,
For many days now I have tried to have a window with a transparent background by using "WA_TranslucentBackground". But it did not work neither on Qt 4.8 or Qt 5.1.1 . When I use it the background stays black. Here is the code:

@#include <QtGui>
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
setAttribute(Qt::WA_TranslucentBackground, true);
ui->setupUi(this);
}

MainWindow::~MainWindow()
{
delete ui;
}
@

the code
@setStyleSheet("background: transparent;");
@
doesn't work too and gives the same result.

Please someone knows what is wrong or at least has an application working with "WA_TranslucentBackground" or "setStyleSheet("background: transparent;")" ?

NB: I am working on Windows Xp but both codes work well on Linux. In addition this problem seems recurrent and many bug reports and threads exist concerning "WA_TranslucentBackground" but without any solution. I am wondering if the Digia's staff is working on it.

[amonR]

Help please!

[peterchou]

you are wrong, read the manual you will know, there need setWindowFlags(Qt::FramelessWindowHint) to be set.

[amonR]

Sorry Peterchou but as the function says itself, it allows just to remove the window's frame. So I can add it or not it wont change the problem... The question is: how do you get a window's background transparent with frame?