QT不规则窗体的使用

程序

//.h
#ifndef SHAPEWIDGET_H
#define SHAPEWIDGET_H

#include <QWidget>
#include <QMouseEvent>
#include <QPainter>
#include <QPixmap>
#include <QBitmap>
class ShapeWidget : public QWidget
{
    Q_OBJECT

public:
    ShapeWidget(QWidget *parent = 0);
    ~ShapeWidget();
protected:
    void mousePressEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
    void paintEvent(QPaintEvent *);
private:
    QPoint dragposition;
};

#endif // SHAPEWIDGET_H

#include "shapewidget.h"

ShapeWidget::ShapeWidget(QWidget *parent)
    : QWidget(parent)
{
    QPixmap pix;
    pix.load("16.png",0,Qt::AvoidDither|Qt::ThresholdDither|Qt::ThresholdAlphaDither);//获取图片路径，0默认格式，读取方式：避免抖动方式
    resize(pix.size());//定义窗体的大小为图片的大小
    setMask(QBitmap(pix.mask()));//为调用它的控件增加一个遮罩，mask获得遮罩为一个QBitmap对象
}

ShapeWidget::~ShapeWidget()
{

}

void ShapeWidget::mousePressEvent(QMouseEvent *event)
{
    if(event->button()==Qt::LeftButton)
    {
        dragposition=event->globalPos()-frameGeometry().topLeft();
        event->accept();
    }
    if(event->button()==Qt::RightButton)
    {
        close();
    }

}

void ShapeWidget::mouseMoveEvent(QMouseEvent *event)
{
    if(event->buttons()&Qt::LeftButton)
    {
        move(event->globalPos()-dragposition);
        event->accept();
    }
}

void ShapeWidget::paintEvent(QPaintEvent *)//绘制在窗体上的图片
{
    QPainter painter(this);
    painter.drawPixmap(0,0,QPixmap("16.png"));
}

效果展示