Qt4.5实现透明窗体

translucentwidget.h：

#ifndef TRANSLUCENTWIDGET_H
#define TRANSLUCENTWIDGET_H

#include
class translucentWidget:public QWidget
{
Q_OBJECT
public:
 translucentWidget(QWidget*p = NULL, bool transparent = true);
 ~translucentWidget();
protected slots:
private:
 void paintEvent(QPaintEvent*e);
};

#endif
translucentwidget.cpp:

#include "translucentwidget.h"
#include
#include
#include
#include

translucentWidget::translucentWidget(QWidget*p, bool trans)
:QWidget(p)
{
        setAttribute(Qt::WA_TranslucentBackground, trans);
 setAutoFillBackground(true);
}

translucentWidget::~translucentWidget()
{
}

void translucentWidget::paintEvent( QPaintEvent*e)
{
 QPainter p(this);
 p.setClipRect(rect());
        QPixmap pixmap("./pic/fine.png");
        p.drawPixmap(pixmap.rect(), pixmap);
}

mainwin.h

#ifndef MAINWIN_H
#define MAINWIN_H
#include
class QLabel;
class MainWin: public QWidget
{
Q_OBJECT
public:
 MainWin(QWidget*p = NULL, Qt::WindowFlags f = 0);
 ~MainWin();
protected slots:
private:
 QLabel* label;
};
#endif
mainwin.cpp

#include "mainwin.h"
#include
#include
#include
#include
#include "translucentwidget.h"

MainWin::MainWin(QWidget*p, Qt::WindowFlags f)
:QWidget(p,f)
{
        resize(300,160);
       // setWindowTitle("Weather Report");
        setAttribute(Qt::WA_TranslucentBackground);

 QVBoxLayout* layout = new QVBoxLayout(this);
 layout->addWidget(new translucentWidget(this, true));
}

MainWin::~MainWin()
{
}

main.cpp

#include
#include "mainwin.h"

int main(int argc, char* argv[])
{
 QApplication app(argc, argv);

        MainWin mw;
        mw.setGeometry(500,0,300,160);
        mw.setFixedSize(300,160);
        mw.setWindowFlags(Qt::Window | Qt::WindowTitleHint | Qt::CustomizeWindowHint | Qt::FramelessWindowHint | Qt::WindowSystemMenuHint);
  mw.show();
  return app.exec();
}