Qt中MainWindow类实例

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QMainWindow有菜单栏，工具栏，状态栏；

可以将QWidget作为QMainWindow的中间部位的一个部件；

mainwindow.h

#ifndef MAINWINDOW_H#define MAINWINDOW_H#include <QMainWindow>#include <QLabel>#include "myview.h"//在mainwindow上再添加一个窗口#include <QSystemTrayIcon>//托盘class MainWindow : public QMainWindow{    Q_OBJECTpublic:    explicit MainWindow(QWidget *parent = 0);    void paintEvent(QPaintEvent *);    void mousePressEvent(QMouseEvent *);    bool event(QEvent *);    QLabel * _label;    MyView * _view;//把要显示的东西都放在这个窗口部件里面；mainWindow起到封装的作用    QMenu * _menu;//用于右键弹出菜单    QSystemTrayIcon * _icon;//托盘图标    void slotActivated(QSystemTrayIcon::ActivationReason);signals:    public slots:    void slotOpen();    void slotSave();};#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"#include <QApplication>#include <QMenu>//菜单类#include <QMenuBar>//菜单栏#include <QAction>//菜单项,是一个可以触发的东西#include <QFileDialog>#include <QDebug>#include <QToolBar>#include <QStatusBar>#include <QPainter>#include <QPixmap>#include <QMouseEvent>#include <QCursor>//鼠标当前的位置#include <QIcon>#include <QEvent>MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent){    /*添加菜单*/    QMenuBar * pMenuBar = menuBar();    QMenu *menu = pMenuBar->addMenu("File");    _menu = menu;    QAction *openAction = menu->addAction("&Open", this, SLOT(slotOpen()), QKeySequence::Open);    QAction *saveAction = menu->addAction("&Save", this, SLOT(slotSave()), QKeySequence::Save);    menu->addSeparator();    QAction *closeAction = menu->addAction("&Exit", this, SLOT(close()), QKeySequence::Close);    /*添加工具栏*/    QToolBar *toolBar = this->addToolBar("MyToolBar");//添加一个工具栏    toolBar->addAction(openAction);    toolBar->addAction(saveAction);    toolBar->addAction(closeAction);    /*添加状态栏*/    QStatusBar *pstatusBar = this->statusBar();    pstatusBar->addWidget(_label = new QLabel("OK"));    _label->setText("<font color = red>Processing...</font>");    /*mainwindow中别的控件占用了之后，剩下的区域都是CentralWidget的*/    _view = new MyView;    this->setCentralWidget(_view);    /*托盘*/    _icon = new QSystemTrayIcon;    _icon->setIcon(QIcon("../1.png"));    _icon->setToolTip("This is my tray test");    _icon->show();//显示该托盘图标    _icon->setContextMenu(menu);    connect(_icon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(slotActivated(QSystemTrayIcon::ActivationReason)));}//这个函数的功能也没有实现void MainWindow::slotActivated(QSystemTrayIcon::ActivationReason reason){    if (reason == QSystemTrayIcon::Trigger){        if (this->isHidden()) this->show();        else this->isHidden();    }}//这个函数的功能没有实现bool MainWindow::event(QEvent *event){    if(event->type() == QEvent::Close){        return false;    }    return QMainWindow::event(event);}void MainWindow::paintEvent(QPaintEvent *){    QPainter p(this);    p.drawPixmap(QPointF(0, 0),QPixmap("../1.png"));}void MainWindow::mousePressEvent(QMouseEvent *ev){    if(ev->button() == Qt::RightButton)        _menu->exec(QCursor::pos());}void MainWindow::slotSave(){    QFileDialog::getSaveFileName();}void MainWindow::slotOpen(){    QString strFile = QFileDialog::getOpenFileName();    qDebug() << strFile;}int main(int argc, char **argv){    QApplication app(argc, argv);    MainWindow w;    w.setGeometry(300, 130, 700, 500);    w.show();    app.exec();}

myview.h

#ifndef MYVIEW_H#define MYVIEW_H#include <QWidget>class MyView : public QWidget{    Q_OBJECTpublic:    explicit MyView(QWidget *parent = 0);    void paintEvent(QPaintEvent *);signals:    public slots:    };#endif // MYVIEW_H

myview.cpp

#include "myview.h"#include <QPainter>MyView::MyView(QWidget *parent) :    QWidget(parent){}void MyView::paintEvent(QPaintEvent *){    QPainter p(this);    p.fillRect(rect(), Qt::red);}

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