3.关于QT中的MainWindow窗口,MenuBar,ToolBar,QuickTip等方面的知识点



1 新建一个空Qt项目

编写12MainWindow.pro

HEADERS += \

    MyMainWindow.h \

    MyView.h

 

SOURCES += \

    MyMainWindow.cpp \

    MyView.cpp

QT += gui widgets

MyView.h

#ifndef MYVIEW_H
#define MYVIEW_H
 
#include <QWidget>
 
class MyView:public QWidget{
    Q_OBJECT
public:
    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);
}

MyMainWindow.h

#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H
 
#include <QMainWindow>
#include <QLabel>
#include "MyView.h"
#include <QSystemTrayIcon>  //通过这个头文件可以让程序在状态栏显示icon
 
class MyMainWindow:public QMainWindow
{
    Q_OBJECT
public:
    explicit MyMainWindow(QWidget *parent = 0);
 
    QLabel* _label;
    MyView* _view;
 
    QSystemTrayIcon* _icon;
 
    void paintEvent(QPaintEvent *);
    void mousePressEvent(QMouseEvent *);
 
    QMenu* _menu;
    bool event(QEvent *event);
    bool eventFilter(QObject *, QEvent *);
 
signals:
 
public slots:
    void slotOpen();
    void slotActivated(QSystemTrayIcon::ActivationReason);
};
 
#endif // MYMAINWINDOW_H

MyMainWindow.cpp

#include "MyMainWindow.h"
#include <QApplication>
 
#include <QMenu>
#include <QMenuBar>
#include <QAction>
#include <QDebug>
#include <QFileDialog>
#include <QToolBar>
#include <QStatusBar>
#include <QLabel>
#include <QPixmap>
#include <QPainter>
#include <QMouseEvent>
#include <QCursor>
#include <QIcon>
 
MyMainWindow::MyMainWindow(QWidget *parent):
    QMainWindow(parent)
{
    /*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(slotOpen()), QKeySequence::Save);
 
    menu->addSeparator();
    QAction* closeAction = menu->addAction("&Exit", this, SLOT(close()), QKeySequence::Close);
    closeAction->setToolTip("close window");
 
    /*toolbar 添加工具栏*/
    QToolBar* toolBar = this->addToolBar("MyToolBar");
    toolBar->addAction(openAction);
    toolBar->addAction(saveAction);
    toolBar->addAction(closeAction);
 
    /* status bar*/
    QStatusBar* pStatusBar = this->statusBar();
    pStatusBar->addWidget(_label = new QLabel("OK"));
 
    _label->setText("<font color=red>Processing...</font>");
 
    /* 别的控件占用了之后,剩下的区域都是CentralWidget */
    _view = new MyView;
    this->setCentralWidget(_view);
 
    //system tray icon
    _icon = new QSystemTrayIcon;
    _icon->setIcon(QIcon("../bing.ico"));
    _icon->setToolTip("This is tray icon test");
    _icon->show();
    _icon->setContextMenu(_menu);
 
    connect(_icon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),
                this, SLOT(slotActivated(QSystemTrayIcon::ActivationReason)));
 
    this->installEventFilter(this);
}
 
void MyMainWindow::slotActivated(QSystemTrayIcon::ActivationReason reason)
{
    if(reason == QSystemTrayIcon::Trigger)
    {
        if(this->isHidden()) this->show();
        else this->hide();
    }
}
 
/**
 * @brief MyMainWindow::eventFilter
 * @param o
 * @param e
 * @return 消息过滤器
 */
bool MyMainWindow::eventFilter(QObject *o, QEvent *e)
{
    if(o == (QObject *)this && e->type() == QEvent::Close)
    {
        return true;
    }
 
    return QMainWindow::eventFilter(o, e);
}
 
bool MyMainWindow::event(QEvent *ev)
{
    qDebug() << ev;
    if(ev->type() == QEvent::Close)
    {
        return false;
    }
 
    return QMainWindow::event(ev);
}
 
void MyMainWindow::mousePressEvent(QMouseEvent *ev)
{
    if(ev->button() == Qt::RightButton)
        _menu->exec(QCursor::pos());
}
 
void MyMainWindow::paintEvent(QPaintEvent *)
{
    QPainter p(this);
    p.drawPixmap(QPoint(0,0),QPixmap(".../aaa.png"));
}
 
void MyMainWindow::slotOpen()
{
    QString strFile = QFileDialog::getOpenFileName();
    qDebug() << "Open file is:" << strFile;
}
 
int main(int argc,char* argv[])
{
    QApplication app(argc,argv);
 
    MyMainWindow w;
 
    w.show();
    return app.exec();
}

运行结果:

3.关于QT中的MainWindow窗口,MenuBar,ToolBar,QuickTip等方面的知识点

右键的时候出现菜单

3.关于QT中的MainWindow窗口,MenuBar,ToolBar,QuickTip等方面的知识点

 

3.关于QT中的MainWindow窗口,MenuBar,ToolBar,QuickTip等方面的知识点

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