Q_OBJECT and styleSheet

[babu198649]

hi
In the following program the stylesheet works for Widget class only when i comment the Q_OBJECT macro.

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QtGui>
 
class Widget:public QWidget
{
   Q_OBJECT//if this line is commented the setStyleSheet works.
 
public:
    Widget(QWidget *parent=0);
};
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
 
private:
    Widget *widget;
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui>

class Widget:public QWidget
{
   Q_OBJECT//if this line is commented the setStyleSheet works.

public:
    Widget(QWidget *parent=0);
};

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);

private:
    Widget *widget;
};

#endif // MAINWINDOW_H

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mainwindow.cpp file

#include "mainwindow.h"
 
Widget::Widget(QWidget *parent) :QWidget(parent)
{
}
 
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    widget = new Widget();
    widget->setStyleSheet("background-color:red");
    setCentralWidget(widget);
 }

#include "mainwindow.h"

Widget::Widget(QWidget *parent) :QWidget(parent)
{
}

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    widget = new Widget();
    widget->setStyleSheet("background-color:red");
    setCentralWidget(widget);
 }

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main.cpp file

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

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how to set the stylesheet of the Widget Class.

[munna]

Found this from the docs

QWidget supports only the background, backgorund-clip and background-origin properties.
If you subclass from QWidget, you need to provide a paintEvent for your custom QWidget as below:
void CustomWidget:aintEvent(QPaintEvent *)
{
QStyleOption opt;
opt.init(this);
QPainter p(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
}
The above code is a no-operation if there is no stylesheet set.
Warning: Make sure you define the Q_OBJECT macro for your custom widget.

May be this can help.