Qt提供了一个QWorkspace类，利用QWorkspace类可以很方便的实现多文档的应用。

QWorkspace类继承自QWidget类，因此只需在QMainWindow主窗口中把QWorkspace对象设置为中央窗体即可。

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示例:演示多文档的布局和焦点控制

MainWin.h

#ifndef MAINWIN_H

#define MAINWIN_H

#include <QtGui>

#include <QWorkspace>

class MainWin : public QMainWindow

{

    Q_OBJECT

public:

    MainWin(QWidget *parent = 0, Qt::WFlags flags = 0);

    ~MainWin();

    void createMenu();

private:

    QWorkspace *workSpace;

private slots:

    void sl_scroll(bool);

   

};

#endif // MAINWIN_H

#ifndef MAINWIN_H#define MAINWIN_H#include 
     
      #include 
      
       class MainWin : public QMainWindow{	Q_OBJECTpublic:	MainWin(QWidget *parent = 0, Qt::WFlags flags = 0);	~MainWin();	void createMenu();private:	QWorkspace *workSpace;private slots:	void sl_scroll(bool);	};#endif // MAINWIN_H
      
     

MainWin.cpp

 

#include "mainwin.h"MainWin::MainWin(QWidget *parent, Qt::WFlags flags)	: QMainWindow(parent, flags){	workSpace = new QWorkspace;	setCentralWidget(workSpace);	//设置workSpace为主窗口的中心窗体	createMenu();	//窗口1：	QMainWindow *win1 = new QMainWindow;	win1->setWindowTitle(tr("window 1"));	QTextEdit *edt1 = new QTextEdit;	edt1->setText("window 1");	win1->setCentralWidget(edt1);	//窗口2：	QMainWindow *win2 = new QMainWindow;	win2->setWindowTitle(tr("window 2"));	QTextEdit *edt2 = new QTextEdit;	edt2->setText("window 2");	win2->setCentralWidget(edt2);	//窗口3：	QMainWindow *win3 = new QMainWindow;	setWindowTitle(tr("window 3"));	QTextEdit *edt3 = new QTextEdit;	edt3->setText("window 3");	win3->setCentralWidget(edt3);	//在workSpace中插入子窗口，即实现多文档的显示	workSpace->addWindow(win1);	workSpace->addWindow(win2);	workSpace->addWindow(win3);}MainWin::~MainWin(){}void MainWin::createMenu(){	//布局菜单	QMenu *menu_layout = menuBar()->addMenu(tr("Layout"));	QAction *act_arrange = new QAction(tr("Arrange Icons"),this);	connect(act_arrange,SIGNAL(triggered()),workSpace,SLOT(arrangeIcons()));	menu_layout->addAction(act_arrange);	QAction *act_tile = new QAction(tr("Tile"),this);	connect(act_tile,SIGNAL(triggered()),workSpace,SLOT(tile()));	menu_layout->addAction(act_tile);	QAction *act_cascade = new QAction(tr("Cascade"),this);	connect(act_cascade,SIGNAL(triggered()),workSpace,SLOT(cascade()));	menu_layout->addAction(act_cascade);	//其他按钮	QMenu *menu_other = menuBar()->addMenu(tr("Other"));	QAction *act_scroll = new QAction(tr("Scroll"),this);	act_scroll->setCheckable(true);	connect(act_scroll,SIGNAL(toggled(checked)),workSpace,SLOT(sl_scroll(checked)));	menu_other->addAction(act_scroll);	menu_other->addSeparator();	//添加分隔符	QAction *act_Next = new QAction(tr("Next"),this);	connect(act_Next,SIGNAL(triggered()),workSpace,SLOT(activateNextWindow()));	menu_other->addAction(act_Next);	QAction *act_previous = new QAction(tr("Previous"),this);	connect(act_previous,SIGNAL(triggered()),workSpace,SLOT(activatePreviousWindow()));	menu_other->addAction(act_previous);}void MainWin::sl_scroll(bool checked){	if(checked)	{		workSpace->setScrollBarsEnabled(true);	}	else	{		workSpace->setScrollBarsEnabled(false);	}}

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在这个示例中,用到了QMenu类和QAction类.

下图为QAction类的信号;

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