按以下要求写qt程序，包括mainwindows.h和mainwindows.cpp：（1）按下鼠标左键并拖动鼠标，按钮随着鼠标的光标移动，同时在状态栏显示鼠标以用户区坐标系表示的位置坐标；（2） 当输入焦点在窗口上时，按下键盘上的Ctrl同时按下M的时候，窗口最大化显示；（3）做弹出式菜单“窗口”，下面三个菜单项“最大”“最小”“普通”，要求菜单项需要有图标，图标自定，要求使用qt的资源；实现三个菜单项对应的功能；（4）在工具栏上添加上述三个菜单项所对应的Action。（5）在窗口上双击鼠标左键，窗口最大化，双击右键，由最大化恢复

以下是 mainwindows.h 文件的代码：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QMouseEvent>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

protected:
    void mousePressEvent(QMouseEvent *event);
    void mouseMoveEvent(QMouseEvent *event);
    void keyPressEvent(QKeyEvent *event);
    void mouseDoubleClickEvent(QMouseEvent *event);

private slots:
    void on_actionMaximize_triggered();
    void on_actionMinimize_triggered();
    void on_actionNormal_triggered();

private:
    Ui::MainWindow *ui;
    QAction *maximizeAction;
    QAction *minimizeAction;
    QAction *normalAction;
};

#endif // MAINWINDOW_H

以下是 mainwindows.cpp 文件的代码：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>
#include <QMenuBar>
#include <QToolBar>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    // 添加菜单栏
    QMenu *windowMenu = new QMenu(tr("&Window"), this);
    menuBar()->addMenu(windowMenu);

    // 添加最大化菜单项
    maximizeAction = new QAction(QIcon(":/icons/maximize.png"), tr("&Maximize"), this);
    maximizeAction->setShortcut(tr("Ctrl+M"));
    windowMenu->addAction(maximizeAction);
    connect(maximizeAction, &QAction::triggered, this, &MainWindow::on_actionMaximize_triggered);

    // 添加最小化菜单项
    minimizeAction = new QAction(QIcon(":/icons/minimize.png"), tr("&Minimize"), this);
    windowMenu->addAction(minimizeAction);
    connect(minimizeAction, &QAction::triggered, this, &MainWindow::on_actionMinimize_triggered);

    // 添加普通菜单项
    normalAction = new QAction(QIcon(":/icons/normal.png"), tr("&Normal"), this);
    windowMenu->addAction(normalAction);
    connect(normalAction, &QAction::triggered, this, &MainWindow::on_actionNormal_triggered);

    // 添加工具栏
    QToolBar *toolBar = new QToolBar(tr("Window"), this);
    addToolBar(toolBar);
    toolBar->addAction(maximizeAction);
    toolBar->addAction(minimizeAction);
    toolBar->addAction(normalAction);
}

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

void MainWindow::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        ui->pushButton->move(event->pos());
        statusBar()->showMessage(QString("X: %1, Y: %2").arg(event->pos().x()).arg(event->pos().y()));
    }
}

void MainWindow::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton) {
        ui->pushButton->move(event->pos());
        statusBar()->showMessage(QString("X: %1, Y: %2").arg(event->pos().x()).arg(event->pos().y()));
    }
}

void MainWindow::keyPressEvent(QKeyEvent *event)
{
    if (event->key() == Qt::Key_M && event->modifiers() == Qt::ControlModifier) {
        setWindowState(windowState() ^ Qt::WindowMaximized);
    }
}

void MainWindow::mouseDoubleClickEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        setWindowState(windowState() | Qt::WindowMaximized);
    } else if (event->button() == Qt::RightButton) {
        setWindowState(windowState() & ~Qt::WindowMaximized);
    }
}

void MainWindow::on_actionMaximize_triggered()
{
    setWindowState(windowState() | Qt::WindowMaximized);
}

void MainWindow::on_actionMinimize_triggered()
{
    setWindowState(windowState() | Qt::WindowMinimized);
}

void MainWindow::on_actionNormal_triggered()
{
    setWindowState(windowState() & ~(Qt::WindowMaximized | Qt::WindowMinimized));
}

注意：本程序使用了三个图片资源文件，包括"maximize.png"、"minimize.png"和"normal.png"，需要将这些图片放在 Qt 项目中的资源文件中。