Qt QMdiArea,QMdiSubWindow——子区域和子窗口

QMdiArea 一般使用于主窗口QMainWindow，用于容纳多个子窗口QMdiSubWindow 
qt creator 3.0的设计师有MdiArea可直接拖入使用。
界面如下,图中灰色框即是个MdiArea，另一图中创建了2个QMdiSubWindow ：





代码如下：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QSize>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->actionNew,SIGNAL(triggered()),this,SLOT(creatNewWin()));//actionNew是通过设计师创建的动作

}

void MainWindow::creatNewWin()
{
mdiWin1=new QMdiSubWindow;
mdiWin1->setWindowTitle("未定");
ui->mdiArea->addSubWindow(mdiWin1);
mdiWin1->resize(QSize(200,200));
mdiWin1->show();
}
MainWindow::~MainWindow()
{
delete ui;
}

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QMdiArea
公有函数如下：

QMdiArea(QWidget * parent = 0)
~QMdiArea()

QMdiSubWindow * addSubWindow(QWidget * widget, Qt::WindowFlags windowFlags = 0)
void    removeSubWindow(QWidget * widget)
void    setActivationOrder(WindowOrder order)//设置激活顺序，默认以创建先后激活，槽函数中有调用，枚举值见1
void    setBackground(const QBrush & background)//设置背景，默认灰色
void    setDocumentMode(bool enabled)
void    setOption(AreaOption option, bool on = true)//现只有一个选项，即创建子窗口，窗口不充满这个区域，默认是充满的，枚举值见2
void    setViewMode(ViewMode mode)//设置视口模式，默认area中很多小窗口，也可以是有tabBar形式的，以下这些设置tab的函数，都需要先开启这个。枚举值见3
void    setTabPosition(QTabWidget::TabPosition position)//设置tabBar的方位，有东西南北四方位，遵循地理的上北下南左西右东枚举值见4
void    setTabShape(QTabWidget::TabShape shape)//设置tab的形状，默认长方形，也可以像谷歌浏览器那样，梯形，枚举值见5
void    setTabsClosable(bool closable)//默认否，设为true时，tab上方形成一个关闭小按钮
void    setTabsMovable(bool movable)//设置是否可移动，默认false,可移动时，可拖动tab在tabBar上移动，现在的浏览器大多有这样的功能

QList<QMdiSubWindow *>    subWindowList(WindowOrder order = CreationOrder) const
QMdiSubWindow * currentSubWindow() const
WindowOrder activationOrder() const
QBrush  background() const
bool    documentMode() const
bool    testOption(AreaOption option) const
QMdiSubWindow * activeSubWindow() const
QTabWidget::TabPosition tabPosition() const
QTabWidget::TabShape    tabShape() const
bool    tabsClosable() const
bool    tabsMovable() const
ViewMode    viewMode() const

Public Slots

void    activateNextSubWindow()
void    activatePreviousSubWindow()
void    cascadeSubWindows()
void    closeActiveSubWindow()
void    closeAllSubWindows()
void    setActiveSubWindow(QMdiSubWindow * window)
void    tileSubWindows()//将所有子窗口在area的可视部分排列整齐

Signals

void    subWindowActivated(QMdiSubWindow * window)//切换激活的窗口时发出

1，enum QMdiArea::WindowOrder

Constant	Value	Description
QMdiArea::CreationOrder	0	按创建时的先后顺序
QMdiArea::StackingOrder	1	堆叠顺序
QMdiArea::ActivationHistoryOrder	2	按激活历史前后顺序.

2，enum QMdiArea::AreaOption

flags QMdiArea::AreaOptions

Constant	Value	Description
QMdiArea::DontMaximizeSubWindowOnActivation	0x1	激活时不使它最大化，默认是最大化的

3，QMdiArea::ViewMode

Constant	Value	Description
QMdiArea::SubWindowView	0	以小窗口形式显示(default).
QMdiArea::TabbedView	1	不仅可小窗口，而且形成tabBar

4，enum QTabWidget::TabPosition

Constant	Value	Description
QTabWidget::North	0	上方显示
QTabWidget::South	1	下
QTabWidget::West	2	左
QTabWidget::East	3	右

5，enum QTabWidget::TabShape

Constant	Value	Description
QTabWidget::Rounded	0	字面是圆形，但win7上更像长方形，default
QTabWidget::Triangular	1	字面三角形，说它是梯形更好些

在以上代码中修改，图中是执行tileSubWindows()函数后的结果：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QSize>
#include <QTabWidget>
#include <QBrush>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QBrush b=QBrush(QColor(30,30,30),Qt::FDiagPattern);
ui->mdiArea->setBackground(b);
ui->mdiArea->setViewMode(QMdiArea::TabbedView);
ui->mdiArea->setTabPosition(QTabWidget::North);
ui->mdiArea->setTabsClosable(true);
ui->mdiArea->setTabsMovable(true);
ui->mdiArea->setTabShape(QTabWidget::Triangular);
ui->mdiArea->setOption(QMdiArea::DontMaximizeSubWindowOnActivation);

connect(ui->actionNew,SIGNAL(triggered()),this,SLOT(creatNewWin()));

}

void MainWindow::creatNewWin()
{
mdiWin1=new QMdiSubWindow;
mdiWin1->setWindowTitle("未定");
ui->mdiArea->addSubWindow(mdiWin1);
mdiWin1->resize(QSize(200,200));
mdiWin1->show();
}
MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_pushButton_clicked()
{
ui->mdiArea->tileSubWindows();
}

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QMdiSubWindow
函数都比较简单，列出如下：

QMdiSubWindow(QWidget * parent = 0, Qt::WindowFlags flags = 0)
~QMdiSubWindow()

void    setKeyboardPageStep(int step)
void    setKeyboardSingleStep(int step)
void    setOption(SubWindowOption option, bool on = true)//未试效果，求补充，枚举值见1
void    setSystemMenu(QMenu * systemMenu).se.
void    setWidget(QWidget * widget)//主要通过个函数添加它的小部件

int keyboardPageStep() const
int keyboardSingleStep() const
QMdiArea *  mdiArea() const
QMenu * systemMenu() const
QWidget *   widget() const
bool    testOption(SubWindowOption option) const
bool    isShaded() const

Public Slots

void	showShaded()
void	showSystemMenu()

Signals

void	aboutToActivate()
void	windowStateChanged(Qt::WindowStates oldState, Qt::WindowStates newState)

1，enum QMdiSubWindow::SubWindowOption

Constant	Value	Description
QMdiSubWindow::RubberBandResize	0x4	If you enable this option, a rubber band control is used to represent the subwindow's outline, and the user resizes this instead of the subwindow itself. As a result, the subwindow maintains its original position and size until the resize operation has been completed, at which time it will receive a single QResizeEvent. By default, this option is disabled.
QMdiSubWindow::RubberBandMove	0x8	If you enable this option, a rubber band control is used to represent the subwindow's outline, and the user moves this instead of the subwindow itself. As a result, the subwindow remains in its original position until the move operation has completed, at which time aQMoveEvent is sent to the window. By default, this option is disabled.

作者：江南烟雨居
出处：http://www.cnblogs.com/newstart//