Qt之布局管理（2）多文档的布局和焦点

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 <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

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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