12.mainwindow

最新推荐文章于 2021-05-11 17:17:14 发布

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本文详细介绍了一个使用Qt框架设计的主窗口类MyMainWindow的实现过程。包括菜单、工具栏、状态栏的创建，以及如何集成自定义视图MyView。此外，还展示了如何利用QSystemTrayIcon创建系统托盘图标，并实现其激活事件响应。

#ifndef MYMAINWINDOW_H
#define MYMAINWINDOW_H

#include <QMainWindow>
#include <QLabel>
#include "MyView.h"
#include <QSystemTrayIcon>

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

#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 */
    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();
    }
}

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();
}

#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

#include "MyView.h"
#include <QPainter>
MyView::MyView(QWidget *parent) :
    QWidget(parent)
{
}


void MyView::paintEvent(QPaintEvent *)
{
    QPainter p(this);
    p.fillRect(rect(), Qt::red);
}