QT中创建透明或者异性的Window

1.main.cpp中 打开窗体的那里添加

      w.setAttribute(Qt::WA_TranslucentBackground);

这样就不会有百边了

然后，假如是MainWindow

头文件里面添加：

protected:

    void paintEvent(QPaintEvent *event);

    void mousePressEvent(QMouseEvent *event);

    void mouseMoveEvent(QMouseEvent *event);

private:

    Ui::MainWindow *ui;

    QPoint dPos;

    QPoint windowPos;

    QPoint mousePos;

cpp文件中：

初始化中：

      QPixmap pix;

    pix.load(":/new/prefix1/image/login.png",0,Qt::AvoidDither|Qt::ThresholdDither|Qt::ThresholdAlphaDither);

    resize(pix.size());

    setMask(QBitmap(pix.mask()));

然后是下面的:

//需要引入#include "QtGui"

void MainWindow::paintEvent(QPaintEvent *event)

{

   QPainter painter(this);

   painter.drawPixmap(0,0,QPixmap(":/new/prefix1/image/login.png"));

//   painter.drawPixmap(0,0,width(),height(),QPixmap(":/new/prefix1/image/login.png"));

//   event->accept();

//   qDebug()<<"set back ground image";

}

//#region

//移动窗体

//QPoint dPos;

//QPoint windowPos;

//QPoint mousePos;

//w.setWindowOpacity(1);

//w.setWindowFlags(Qt::FramelessWindowHint);

//w.setAttribute(Qt::WA_TranslucentBackground);

void MainWindow::mousePressEvent(QMouseEvent *event){

    this->windowPos = this->pos();

    this->mousePos = event->globalPos();

    this->dPos = mousePos - windowPos;

}

void MainWindow::mouseMoveEvent(QMouseEvent *event){

    this->move(event->globalPos()-dPos);

}

这样做出来的异常窗体，你去任务栏里面点一下看看。。。

 很多网络教程不是使用setMask的，你去任务栏点击看看，不起作用！