Qt5开发及实例学习之不规则窗体：没看懂

- 日理万妓 2022-10-24 11:44 194阅读 0赞

1、新建QT GUI工程，项目名称“ShapeWidget”, 基类QWidget， 类名ShapeWidget，取消“创建界面”

2、ShapeWidget.h

#ifndef SHAPEWIDGET_H
    #define SHAPEWIDGET_H
    
    #include <QWidget>
    
    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

3、

#include "shapewidget.h"
    #include <QMouseEvent>
    #include <QPainter>
    #include <QPixmap>
    #include <QBitmap>
    
    
    ShapeWidget::ShapeWidget(QWidget *parent)
        : QWidget(parent)
    {
        QPixmap pix;
        pix.load("F:\\MyCode\\test1.bmp", 0, Qt::AvoidDither|Qt::ThresholdDither|Qt::ThresholdAlphaDither);
        resize(pix.size());
        setMask(QBitmap(pix.mask()));
    }
    
    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 *event)
    {
        QPainter painter(this);
        painter.drawPixmap(0,0,QPixmap("F:\\MyCode\\test1.bmp"));
    }