QT实现拖拽TabWidget选项卡形成单独的窗口，双击标题栏可还原的功能【dock功能】

灰太狼 2022-08-25 09:07 618阅读 0赞

近期做QT，我也是新手，这个主要是用重构父类事件实现的，即子类化。

此文章是在[http://blog.csdn.net/zmm19861210/article/details/9036779][http_blog.csdn.net_zmm19861210_article_details_9036779]上看到的，但是我做了一定的修改\[备注：下方的代码上未体现，还是老代码\]，我做了析构函数的修改，就是将堆上那些new出来的私有变量给delete掉，由于代码是在主机上调试的，公司使用远程桌面方式上网，所以没有权限上传到远程桌面来整个demo真是遗憾。

这个功能看似简单，实现起来确实有点儿难度。
    在代码里详细说明吧。
    //CTabWidget.h
    #ifndef CTABWIDGET_H
    #define CTABWIDGET_H
    #include <QTabWidget>
    #include <QtGui>
    #include "CTabBar.h"
    
    class CTabWidget :public QTabWidget
    {
        Q_OBJECT
    public:
        CTabWidget(QWidget* =0);
    	virtual ~CTabWidget(){};
    public:
    	CTabBar *tabBar;
    };
    #endif // CTABWIDGET_H
    
    //CTabWidget.cpp
    #include "CTabWidget.h"
    
    CTabWidget::CTabWidget(QWidget *parent):QTabWidget(parent)
    {
    	tabBar = new CTabBar;
    	setTabBar(tabBar);     //这里是关键，这样用我们自定义的CTabBar替换原来的QTabBar
    }
    
    //CTabBar.h
    #ifndef CTABBAR_H
    #define CTABBAR_H
    #include <QTabBar>
    #include <QtGui>
    
    class CTabBar :public QTabBar
    {
    	Q_OBJECT
    public:
    	CTabBar(QWidget* =0);
    	virtual ~CTabBar(){};
    protected:
    	void mousePressEvent(QMouseEvent *);
    	void mouseReleaseEvent(QMouseEvent *);   //通过两个事件模拟出tab被拖动的动作
    private:
    	bool pressFlag;
    signals:
    	void sig_tabDrag(int,QPoint);
    };
    #endif
    
    //CTabBar.cpp
    #include "CTabBar.h"
    #include <QtGui>
     
    CTabBar::CTabBar(QWidget *parent):QTabBar(parent),pressFlag(false)
    {
     
    }
     
    void CTabBar::mousePressEvent(QMouseEvent *event)
    {    
        if (event->button()==Qt::LeftButton)
        {
            pressFlag = true;
        }
        QTabBar::mousePressEvent(event);
    }
     
    void CTabBar::mouseReleaseEvent(QMouseEvent *event)
    {
        if(event->button() == Qt::LeftButton &&pressFlag )
        {
            pressFlag = false;     
            if(tabRect(currentIndex()).contains( event->pos()))
                return;
            emit sig_tabDrag(currentIndex(),event->pos());
        }    
    }
    
    现在实现窗口标题栏被双击动作
    //CWidget.h
    #ifndef CWIDGET_H
    #define CWIDGET_H
    #include <QtGui/QWidget>
    
    class CWidget:public QWidget
    {
    	Q_OBJECT
    public:
    	CWidget(QWidget* = 0);
    	~CWidget();
    protected:
    	bool event(QEvent *);
    signals:
    	void sig_doubleClickedTitleBar();  //被双击时发射的信号
    };
    #endif
    
    //CWidget.cpp
    #include "CWidget.h"
    #include <QtGui>
    CWidget::CWidget(QWidget *parent):QWidget(parent)
    {
    
    }
    
    CWidget::~CWidget()
    {
    
    }
    
    bool CWidget::event(QEvent *event)
    {
    #ifdef unix
        if(event->type() == QEvent::MouseButtonDblClick){   //标题栏单击没反应，就单击窗口边缘替代吧
            emit sig_doubleClickedTitleBar();
            return true;
        }
    #endif   
    	if (event->type() == QEvent::NonClientAreaMouseButtonDblClick)  //这个事件在Linux下没有触发，应该算是Qt的一个Bug吧
        {
    		emit sig_doubleClickedTitleBar();
    		return true;
    	}
        return QWidget::event(event);
    }
    
    //CMainWindow.h
    #ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    #include <QMainWindow>
    #include <QTextEdit>
    #include "CTabWidget.h"
    #include "CTabBar.h"
    
    class CMainWindow:public QMainWindow
    {
    	Q_OBJECT
    public:
    	CMainWindow(QWidget* = 0);  
    private:
    	CTabWidget *tabWidget;
    private slots:
        void slot_tabBarDoubleClicked();            //响应双击弹回的槽函数
        void slot_tabDrag(int index,QPoint point);  //响应拖动动作的槽函数
        void slot_closeTab(int);                    //关闭tab的槽函数
    };
    
    #endif // MAINWINDOW_H
    
    //CMainWindow.cpp
    #include "CMainWindow.h"
    #include "CTabWidget.h"
    #include "CWidget.h"
    #include <QtGui>
    
    CMainWindow::CMainWindow(QWidget *parent):QMainWindow(parent)
    {
        tabWidget = new CTabWidget(this);
        tabWidget->setMovable(true);
        tabWidget->setTabsClosable(true);
        tabWidget->setTabShape(QTabWidget::Triangular);
        //添加4个tab页
        tabWidget->addTab(new QTextEdit,"eidt 1");
        tabWidget->addTab(new QTextEdit,"eidt 2");
        tabWidget->addTab(new QTextEdit,"eidt 3");
        tabWidget->addTab(new QTextEdit,"eidt 4");
        setCentralWidget(tabWidget);
    
        connect(tabWidget->tabBar,SIGNAL(sig_tabDrag(int,QPoint)),this,SLOT(slot_tabDrag(int,QPoint)));
        connect(tabWidget,SIGNAL(tabCloseRequested(int)),this,SLOT(slot_closeTab(int)));
        connect(tabWidget,SIGNAL(currentChanged(int)),tabWidget,SLOT(setCurrentIndex(int)));
    
        resize(800,600);
    }
    
    void CMainWindow::slot_tabDrag(int index,QPoint point)
    {
        CWidget *widget = new CWidget;
        QWidget *draged = tabWidget->widget(index);
        QString windowName = tabWidget->tabText(index);
        tabWidget->removeTab(index);
        connect(widget,SIGNAL(sig_doubleClickedTitleBar()),this,SLOT(slot_tabBarDoubleClicked()));
    
        QGridLayout *layout = new QGridLayout;
        layout->addWidget(draged);
        widget->setLayout(layout);
        widget->resize(600,400);
        widget->move(point+pos()+tabWidget->pos());
        widget->setWindowTitle(windowName);
        widget->show();
        draged->show();
    }
    
    void CMainWindow::slot_tabBarDoubleClicked()
    {
        CWidget *widget = qobject_cast<CWidget*>(sender());
        QObjectList list = widget->children();
        QTextEdit *edit = NULL;
        
        for(int i = 0;i<list.count();++i)
        {
            if(list[i]->inherits("QTextEdit"))
            {
                edit = qobject_cast<QTextEdit*>(list[i]);
                break;
            }
        }
        if(edit == NULL)
        {
            return ;
        }
    
        edit->setParent(tabWidget);
        tabWidget->addTab(edit,widget->windowTitle());
        delete widget;
    }
    
    void CMainWindow::slot_closeTab(int index)
    {
        QWidget *draged = tabWidget->widget(index);
        tabWidget->removeTab(index);
        delete draged;
    }
    
    //main.cpp
    #include "CMainWindow.h"
    #include <QApplication>
    #include <QCleanlooksStyle>
    
    int main(int argc,char **argv)
    {
        QApplication app(argc,argv);
        QApplication::setStyle(new QCleanlooksStyle);
        QTextCodec::setCodecForTr(QTextCodec::codecForName("gb2312"));
        CMainWindow mainwindow;
    	mainwindow.show();
        return app.exec();
    }

[http_blog.csdn.net_zmm19861210_article_details_9036779]: http://blog.csdn.net/zmm19861210/article/details/9036779