Qt 实现多文档

_{哈尔滨理工大学软件工程专业08-7李万鹏原创作品，转载请标明出处}

_{http://blog.csdn.net/woshixingaaa/archive/2010/08/10/5800795.aspx}

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_{Qt 提供了一个 QWorkspace 类，利用 QWorkspace 可以很容易实现多文档的应用。 QWorkspace 类继承自 QWidget ，因此只需要在 QMainWindow 主窗口中把 QWorkspace 对象设置为中央窗体即。QWorkspace 类提供了许多对子窗口进行排序的函数接口，如cascade(),arrangeIcon(),tile()。}

//window.h
#ifndef WINDOW_H
#define WINDOW_H
#include <QWorkspace>
#include <QTextEdit>
#include <QMenu>
#include <QMenuBar>
#include <QAction>
#include <QtGui>
class MainWidget : public QMainWindow{
	Q_OBJECT
public:
	MainWidget();
	~MainWidget();
	void createMenu();
private slots:
	void slotScroll(bool);
private:
	QWorkspace * workspace;
};
#endif

_{先把QWorkspace类设为MainWidget的中央窗体，用QMainWindow类创建3个子窗口window1,window2,window3，}

_{通过addWindow()方法把子窗体插入QWorkspace。}

_{实现对字窗口的arrangeIcons布局，它的布局方式是所有子窗口在主窗口底部按标题栏排列，可直接把triggered()信号}

和arrangeIcons()函数相连。注意此排列方式仅对已最小的子窗口起作用。

实现对子窗口的tile布局，tile的意思是用子窗口把主窗口像铺瓦片或贴瓷砖一样贴满。

实现对子窗口的cascade布局，即子窗口的层叠显示

activateNextWindow()，使下一个子窗口获得焦点。

activatePreviousWindow()，使前一个子窗口获得焦点。

setScrollBarsEnabled(),它的参数是bool型的，如果为true，则滑动条可用，如果为false，滑动条不可用。

#include "window.h"
MainWidget::MainWidget(){
	workspace = new QWorkspace; 
	setWindowTitle("Mutiple Document");
	setCentralWidget(workspace);
	createMenu();
	
	QMainWindow * window1 = new QMainWindow;
	window1->setWindowTitle("window1");
	QTextEdit * e1 = new QTextEdit;
	e1->setText("window1");
	window1->setCentralWidget(e1);
	QMainWindow * window2 = new QMainWindow;
	window2->setWindowTitle("window2");
	QTextEdit * e2 = new QTextEdit;
	e2->setText("window2");
	window2->setCentralWidget(e2);
	QMainWindow * window3 = new QMainWindow;
	window3->setWindowTitle("window3");
	QTextEdit * e3 = new QTextEdit; 	
	e3->setText("window3");
	window3->setCentralWidget(e3);
	workspace->addWindow(window1);
	workspace->addWindow(window2);
	workspace->addWindow(window3);
}
void MainWidget::createMenu(){
	QMenu *layout = menuBar()->addMenu(tr("Layout"));
	QAction * arrange = new QAction(tr("Arange Icons"),this);
	connect(arrange,SIGNAL(triggered()),workspace,SLOT(arrangeIcons()));
	layout->addAction(arrange);
	QAction *tile = new QAction(tr("Tile"),this);
	connect(tile,SIGNAL(triggered()),workspace,SLOT(tile()));
	layout->addAction(tile);
	QAction *cascade = new QAction(tr("Cascade"),this);
	connect(cascade,SIGNAL(triggered()),workspace,SLOT(cascade()));
	layout->addAction(cascade);
	QMenu *other = menuBar()->addMenu(tr("Other"));
	QAction *scroll = new QAction(tr("Scroll"),this);
	scroll->setCheckable(true);
	connect(scroll,SIGNAL(toggled(bool)),this,SLOT(slotScroll(bool)));
	other->addAction(scroll);
	other->addSeparator();
	QAction *next = new QAction(tr("nextWindow"),this);
	connect(next,SIGNAL(triggered()),workspace,SLOT(activateNextWindow()));
	other->addAction(next);
	
	QAction * previous = new QAction(tr("previousWindow"),this);
	connect(previous,SIGNAL(triggered()),workspace,SLOT(activatePreviousWindow()));
	other->addAction(previous);
}
MainWidget::~MainWidget(){
	
}
void MainWidget::slotScroll(bool check){
	if(check)
		workspace->setScrollBarsEnabled(true);
	else
		workspace->setScrollBarsEnabled(false);
}

#include <QApplication>
#include "window.h"
int main(int argc, char *argv[]){
	QApplication app(argc, argv);
	MainWidget w;
	w.show();
	return app.exec();
}