Qt buton窗口中拖动，右键弹出菜单可调整大小

　　最近写了一个小项目案例，可点击button拖动，可右键弹出菜单调整button大小，可用于有需要的同学进行扩展

1、运行效果

初始效果

鼠标左键按下拖动

选中button右键

填写调整的大小数值

 点击ok

2、实现如下：

#include <QMouseEvent>
#include <QDebug>
#include "MoveButton.h"

MoveButton::MoveButton(QWidget *parent) : QPushButton(parent)
{
    resizeWHDialog = new ResizeWHDialog(this);
    //this->setStyleSheet("background-color: rgb(218,165,32); border: 1px");

    buttonAction1 = new QAction(QStringLiteral("宽高调整"),this);
    buttonMenu = new QMenu(this);
    buttonMenu->addAction(buttonAction1);
    connect(resizeWHDialog,&ResizeWHDialog::resizeWHSignal,[&](uint w,uint h){
        qDebug()<<"resizeWHDialog accept,w="<<w<<",h="<<h;
        emit resizeBtnWHSignal(this,this->x(),this->y(),w,h);
    });

    connect( buttonAction1, &QAction::triggered, [=]()
    {
        qDebug()<<"buttonAction1 is triggered";
        resizeWHDialog->exec();
    });
    this->setContextMenuPolicy(Qt::CustomContextMenu);
    connect(this,&QPushButton::customContextMenuRequested,[&](const QPoint &pos){
        qDebug()<<pos;//参数pos用来传递右键点击时的鼠标的坐标，这个坐标一般是相对于控件左上角而言的
        buttonMenu->exec(QCursor::pos());
    });
}
void MoveButton::on_pushButton_customContextMenuRequested(const QPoint &pos)
{
    qDebug()<<pos;//参数pos用来传递右键点击时的鼠标的坐标，这个坐标一般是相对于控件左上角而言的
    buttonMenu->exec(QCursor::pos());
}
void MoveButton::setWight(const int w)noexcept
{
    this->setWight(w);
}
void MoveButton::setHeight(const int h)noexcept
{
    this->setHeight(h);
}

void MoveButton::mousePressEvent(QMouseEvent *event)
{
    if(event->button() == Qt::LeftButton)
    {
        _beginPos = event->pos();
    }
}

void MoveButton::mouseMoveEvent(QMouseEvent *event)
{
    _lastPos = event->pos();

    int t_xDistance = _lastPos.x() - _beginPos.x();
    int t_yDistance = _lastPos.y() - _beginPos.y();
    if((this->x()+t_xDistance<=parentWidget()->width()-this->width())
            && (this->y()+t_yDistance<=parentWidget()->height()-this->height())
            && this->x()+t_xDistance>=0
            && this->y()+t_yDistance>=0)
    {
        this->move(this->x()+t_xDistance,this->y()+t_yDistance);
    }
}
void MoveButton::keyPressEvent(QKeyEvent *event)
{
    if(event->key() == Qt::Key_Left)
    {
        if(this->x()-4>=0)
        {
            this->move(this->x()-4,this->y());
        }
    }
    else if(event->key() == Qt::Key_Right)
    {
        if(parentWidget()->width()-this->width()-this->x()-4>=0)
        {
            this->move(this->x()+4,this->y());
        }
    }
    else if(event->key() == Qt::Key_Up)
    {
        if(this->y()-4>=0)
        {
            this->move(this->x(),this->y()-4);
        }
    }
    else if(event->key() == Qt::Key_Down)
    {
        if(parentWidget()->height()-this->height()-this->y()-4>=0)
        {
            this->move(this->x(),this->y()+4);
        }
    }
}

#include <QDebug>
#include "ResizeWH.h"
#include "ui_resizewhdialog.h"

ResizeWHDialog::ResizeWHDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::ResizeWHDialog)
{
    ui->setupUi(this);
}

ResizeWHDialog::~ResizeWHDialog()
{
    delete ui;
}

void ResizeWHDialog::on_buttonBox_accepted()
{
    qDebug()<<"ResizeWHDialog accept,w="<<ui->lineEdit_h->text().toUInt()<<",h="<<ui->lineEdit_w->text().toUInt();
    emit resizeWHSignal(ui->lineEdit_h->text().toUInt(),ui->lineEdit_w->text().toUInt());
}

#ifndef MOVEBUTTON_H
#define MOVEBUTTON_H

#include <QObject>
#include <QPushButton>
#include <QWidget>
#include <QAction>
#include <QMenu>

#include "ResizeWH.h"

class MoveButton : public QPushButton
{
    Q_OBJECT
public:
    explicit MoveButton(QWidget *parent = nullptr);
    void setWight(const int w=0)noexcept;
    void setHeight(const int h=0)noexcept;

private slots:
    void on_pushButton_customContextMenuRequested(const QPoint &pos);

signals:
    void resizeBtnWHSignal(QPushButton *obj,uint x = 0,uint y = 0, uint w = 0,uint h =0);

protected:

    void mousePressEvent(QMouseEvent *event);

    void mouseMoveEvent(QMouseEvent *event);

    void keyPressEvent(QKeyEvent *event);
private:

    QPoint _beginPos;

    QPoint _lastPos;

    QAction * buttonAction1;

    QMenu * buttonMenu;


    ResizeWHDialog *resizeWHDialog;

};

#endif // MOVEBUTTON_H