1 新建一個空Qt專案

編寫12MainWindow.pro

HEADERS+=\

MyMainWindow.h\

MyView.h

SOURCES+=\

MyMainWindow.cpp\

MyView.cpp

QT+=guiwidgets

MyView.h

#ifndefMYVIEW_H

#defineMYVIEW_H

#include<QWidget>

classMyView:publicQWidget{

Q_OBJECT

public:

explicitMyView(QWidget*parent=0);

void
 
paintEvent(QPaintEvent*);

signals:

publicslots:

};

#endif//MYVIEW_H

MyView.cpp

#include"MyView.h"

#include<QPainter>

MyView::MyView(QWidget*parent):

QWidget(parent)

{

}

voidMyView::paintEvent(QPaintEvent*)

{

QPainterp(this);

p.fillRect(rect(),Qt::red);

}

MyMainWindow.h

#ifndef
 
MYMAINWINDOW_H

#defineMYMAINWINDOW_H

#include<QMainWindow>

#include<QLabel>

#include"MyView.h"

#include<QSystemTrayIcon>//通過這個標頭檔案可以讓程式在狀態列顯示icon

classMyMainWindow:publicQMainWindow

{

Q_OBJECT

public:

explicitMyMainWindow(QWidget*parent=0);

QLabel*_label;

MyView*_view;

QSystemTrayIcon
 
*_icon;

voidpaintEvent(QPaintEvent*);

voidmousePressEvent(QMouseEvent*);

QMenu*_menu;

boolevent(QEvent*event);

booleventFilter(QObject*,QEvent*);

signals:

publicslots:

voidslotOpen();

voidslotActivated(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)

{

/*加選單*/

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("closewindow");

/*toolbar新增工具欄*/

QToolBar*toolBar=this->addToolBar("MyToolBar");

toolBar->addAction(openAction);

toolBar->addAction(saveAction);

toolBar->addAction(closeAction);

/*statusbar*/

QStatusBar*pStatusBar=this->statusBar();

pStatusBar->addWidget(_label=newQLabel("OK"));

_label->setText("<fontcolor=red>Processing...</font>");

/*別的控制元件佔用了之後，剩下的區域都是CentralWidget*/

_view=newMyView;

this->setCentralWidget(_view);

//systemtrayicon

_icon=newQSystemTrayIcon;

_icon->setIcon(QIcon("../bing.ico"));

_icon->setToolTip("Thisistrayicontest");

_icon->show();

_icon->setContextMenu(_menu);

connect(_icon,SIGNAL(activated(QSystemTrayIcon::ActivationReason)),

this,SLOT(slotActivated(QSystemTrayIcon::ActivationReason)));

this->installEventFilter(this);

}

voidMyMainWindow::slotActivated(QSystemTrayIcon::ActivationReasonreason)

{

if(reason==QSystemTrayIcon::Trigger)

{

if(this->isHidden())this->show();

elsethis->hide();

}

}

/**

*@briefMyMainWindow::eventFilter

*@paramo

*@parame

*@return訊息過濾器

*/

boolMyMainWindow::eventFilter(QObject*o,QEvent*e)

{

if(o==(QObject*)this&&e->type()==QEvent::Close)

{

returntrue;

}

returnQMainWindow::eventFilter(o,e);

}

boolMyMainWindow::event(QEvent*ev)

{

qDebug()<<ev;

if(ev->type()==QEvent::Close)

{

returnfalse;

}

returnQMainWindow::event(ev);

}

voidMyMainWindow::mousePressEvent(QMouseEvent*ev)

{

if(ev->button()==Qt::RightButton)

_menu->exec(QCursor::pos());

}

voidMyMainWindow::paintEvent(QPaintEvent*)

{

QPainterp(this);

p.drawPixmap(QPoint(0,0),QPixmap(".../aaa.png"));

}

voidMyMainWindow::slotOpen()

{

QStringstrFile=QFileDialog::getOpenFileName();

qDebug()<<"Openfileis:"<<strFile;

}

intmain(intargc,char*argv[])

{

QApplicationapp(argc,argv);

MyMainWindoww;

w.show();

returnapp.exec();

}

執行結果：

右鍵的時候出現選單