QT中的透明小部件

Question

I want to draw a circle on a widget and within the circle background screen should be visible ie just border/circumference of circle should be visible on the widget. Rest of the widget should be transparent. I have tried : 1) setStyleSheet("background:transparent;") 2) setAttribute( Qt::WA_TranslucentBackground, true ); 3) Overriding paintEvent(QPaintEvent* event);

All of the above methode didn't work. and setAutoFillBackground() is false. I am new to Qt and above solution I just found on google. Please Help.

Answer 1

This will do the job :D

#include <QApplication>
#include <QtGui/QMainWindow>
#include <QtGui/QPushButton>
#include <QtGui/QHBoxLayout>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow *win=new QMainWindow(0);
    win->setAttribute(Qt::WA_TranslucentBackground,true);
    win->show();
    return a.exec();
}

Answer 2

The QWidget::setMask function, if used on the window, will have that affect. See also the shaped clock example (also referenced from the setMask documentation).