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：
右键的时候出现菜单
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