The QMdiArea widget provides an area in which MDI windows are displayed. More...

Inheritance diagram for QMdiArea:

Public Typedefs
using	AreaOptions = QFlags< AreaOption >

Public Typedefs inherited from QWidget
using	RenderFlags = QFlags< RenderFlag >

Public Types
enum	AreaOption

enum	ViewMode

enum	WindowOrder

Public Types inherited from QFrame
enum	Shadow

enum	Shape

enum	StyleMask

Public Types inherited from QWidget
enum	RenderFlag

Public Types inherited from QPaintDevice
enum	PaintDeviceMetric

Public Signals
void	subWindowActivated (QMdiSubWindow *window)

Public Signals inherited from QWidget
void	customContextMenuRequested (const QPoint &pos)

void	windowIconChanged (const QIcon &icon)

void	windowIconTextChanged (const QString &iconText)

void	windowTitleChanged (const QString &title)

Public Signals inherited from QObject
void	destroyed (QObject *obj=nullptr)

void	objectNameChanged (const QString &objectName)

Public Slots
void	activateNextSubWindow ()

void	activatePreviousSubWindow ()

void	cascadeSubWindows ()

void	closeActiveSubWindow ()

void	closeAllSubWindows ()

void	setActiveSubWindow (QMdiSubWindow *window)

void	tileSubWindows ()

Public Slots inherited from QWidget
bool	close ()

void	hide ()

void	lower ()

void	raise ()

void	repaint ()

void	setDisabled (bool disable)

void	setEnabled (bool enable)

void	setFocus ()

void	setHidden (bool hidden)

void	setStyleSheet (const QString &styleSheet)

virtual void	setVisible (bool visible)

void	setWindowModified (bool modified)

void	setWindowTitle (const QString &title)

void	show ()

void	showFullScreen ()

void	showMaximized ()

void	showMinimized ()

void	showNormal ()

void	update ()

Public Slots inherited from QObject
void	deleteLater ()

Public Methods
	QMdiArea (QWidget *parent=nullptr)

	~QMdiArea ()

WindowOrder	activationOrder () const

QMdiSubWindow *	activeSubWindow () const

QMdiSubWindow *	addSubWindow (QWidget *widget, Qt::WindowFlags flags=Qt::EmptyFlag)

QBrush	background () const

QMdiSubWindow *	currentSubWindow () const

bool	documentMode () const

QSize	minimumSizeHint () const override

void	removeSubWindow (QWidget *widget)

void	setActivationOrder (WindowOrder order)

void	setBackground (const QBrush &background)

void	setDocumentMode (bool enable)

void	setOption (AreaOption option, bool on=true)

void	setTabPosition (QTabWidget::TabPosition position)

void	setTabsClosable (bool closeable)

void	setTabShape (QTabWidget::TabShape shape)

void	setTabsMovable (bool movable)

void	setViewMode (ViewMode mode)

QSize	sizeHint () const override

QList< QMdiSubWindow * >	subWindowList (WindowOrder order=CreationOrder) const

QTabWidget::TabPosition	tabPosition () const

bool	tabsClosable () const

QTabWidget::TabShape	tabShape () const

bool	tabsMovable () const

bool	testOption (AreaOption option) const

ViewMode	viewMode () const

Public Methods inherited from QAbstractScrollArea
	QAbstractScrollArea (QWidget *parent=nullptr)

	~QAbstractScrollArea ()

void	addScrollBarWidget (QWidget *widget, Qt::Alignment alignment)

QWidget *	cornerWidget () const

QScrollBar *	horizontalScrollBar () const

Qt::ScrollBarPolicy	horizontalScrollBarPolicy () const

QSize	maximumViewportSize () const

QWidgetList	scrollBarWidgets (Qt::Alignment alignment)

void	setCornerWidget (QWidget *widget)

void	setHorizontalScrollBar (QScrollBar *scrollBar)

void	setHorizontalScrollBarPolicy (Qt::ScrollBarPolicy policy)

void	setSizeAdjustPolicy (SizeAdjustPolicy policy)

virtual void	setupViewport (QWidget *viewport)

void	setVerticalScrollBar (QScrollBar *scrollBar)

void	setVerticalScrollBarPolicy (Qt::ScrollBarPolicy policy)

void	setViewport (QWidget *widget)

SizeAdjustPolicy	sizeAdjustPolicy () const

QScrollBar *	verticalScrollBar () const

Qt::ScrollBarPolicy	verticalScrollBarPolicy () const

QWidget *	viewport () const

Public Methods inherited from QFrame
	QFrame (QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

	~QFrame ()

QRect	frameRect () const

Shadow	frameShadow () const

Shape	frameShape () const

int	frameStyle () const

int	frameWidth () const

int	lineWidth () const

int	midLineWidth () const

void	setFrameRect (const QRect &rect)

void	setFrameShadow (Shadow value)

void	setFrameShape (Shape value)

void	setFrameStyle (int style)

void	setLineWidth (int width)

void	setMidLineWidth (int width)

Public Methods inherited from QWidget
	QWidget (QWidget *parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

	~QWidget ()

bool	acceptDrops () const

QString	accessibleDescription () const

QString	accessibleName () const

QList< QAction * >	actions () const

void	activateWindow ()

void	addAction (QAction *action)

void	addActions (const QList< QAction * > &actions)

void	adjustSize ()

bool	autoFillBackground () const

QPalette::ColorRole	backgroundRole () const

QBackingStore *	backingStore () const

QSize	baseSize () const

QWidget *	childAt (const QPoint &position) const

QWidget *	childAt (int x, int y) const

QRect	childrenRect () const

QRegion	childrenRegion () const

void	clearFocus ()

void	clearMask ()

QMargins	contentsMargins () const

QRect	contentsRect () const

Qt::ContextMenuPolicy	contextMenuPolicy () const

QCursor	cursor () const

WId	effectiveWinId () const

void	ensurePolished () const

Qt::FocusPolicy	focusPolicy () const

QWidget *	focusProxy () const

QWidget *	focusWidget () const

const QFont &	font () const

QFontInfo	fontInfo () const

QFontMetrics	fontMetrics () const

QPalette::ColorRole	foregroundRole () const

QRect	frameGeometry () const

QSize	frameSize () const

const QRect &	geometry () const

void	getContentsMargins (int left, int top, int right, int bottom) const

QPixmap	grab (const QRect &rectangle=QRect (QPoint (0, 0), QSize (-1,-1)))

void	grabGesture (Qt::GestureType gestureType, Qt::GestureFlags flags=Qt::GestureFlags ())

void	grabKeyboard ()

void	grabMouse ()

void	grabMouse (const QCursor &cursor)

int	grabShortcut (const QKeySequence &key, Qt::ShortcutContext context=Qt::WindowShortcut)

QGraphicsEffect *	graphicsEffect () const

QGraphicsProxyWidget *	graphicsProxyWidget () const

bool	hasEditFocus () const

bool	hasFocus () const

virtual bool	hasHeightForWidth () const

bool	hasMouseTracking () const

int	height () const

virtual int	heightForWidth (int width) const

Qt::InputMethodHints	inputMethodHints () const

virtual QVariant	inputMethodQuery (Qt::InputMethodQuery query) const

void	insertAction (QAction before, QAction action)

void	insertActions (QAction before, QList< QAction > actions)

bool	isActiveWindow () const

bool	isAncestorOf (const QWidget *child) const

bool	isEnabled () const

bool	isEnabledTo (const QWidget *parent) const

bool	isEnabledToTLW () const

bool	isFullScreen () const

bool	isHidden () const

bool	isMaximized () const

bool	isMinimized () const

bool	isModal () const

bool	isTopLevel () const

bool	isVisible () const

bool	isVisibleTo (const QWidget *parent) const

bool	isWindow () const

bool	isWindowModified () const

QLayout *	layout () const

Qt::LayoutDirection	layoutDirection () const

QLocale	locale () const

QPoint	mapFrom (const QWidget *parent, const QPoint &pos) const

QPoint	mapFromGlobal (const QPoint &pos) const

QPoint	mapFromParent (const QPoint &pos) const

QPoint	mapTo (const QWidget *parent, const QPoint &pos) const

QPoint	mapToGlobal (const QPoint &pos) const

QPoint	mapToParent (const QPoint &pos) const

QRegion	mask () const

int	maximumHeight () const

QSize	maximumSize () const

int	maximumWidth () const

int	minimumHeight () const

QSize	minimumSize () const

int	minimumWidth () const

void	move (const QPoint &point)

void	move (int x, int y)

QWidget *	nativeParentWidget () const

QWidget *	nextInFocusChain () const

QRect	normalGeometry () const

void	overrideWindowFlags (Qt::WindowFlags flags)

QPaintEngine *	paintEngine () const override

const QPalette &	palette () const

QWidget *	parentWidget () const

QPoint	pos () const

QWidget *	previousInFocusChain () const

QRect	rect () const

void	releaseKeyboard ()

void	releaseMouse ()

void	releaseShortcut (int id)

void	removeAction (QAction *action)

void	render (QPaintDevice *target, const QPoint &targetOffset=QPoint (), const QRegion &sourceRegion=QRegion (), RenderFlags renderFlags=RenderFlags (DrawWindowBackground\|DrawChildren))

void	render (QPainter *painter, const QPoint &targetOffset=QPoint (), const QRegion &sourceRegion=QRegion (), RenderFlags renderFlags=RenderFlags (DrawWindowBackground\|DrawChildren))

void	repaint (const QRect &rect)

void	repaint (const QRegion &region)

void	repaint (int x, int y, int w, int h)

void	resize (const QSize &size)

void	resize (int w, int h)

bool	restoreGeometry (const QByteArray &geometry)

QByteArray	saveGeometry () const

void	scroll (int dx, int dy)

void	scroll (int dx, int dy, const QRect &rect)

void	setAcceptDrops (bool on)

void	setAccessibleDescription (const QString &description)

void	setAccessibleName (const QString &name)

void	setAttribute (Qt::WidgetAttribute attribute, bool enable=true)

void	setAutoFillBackground (bool enable)

void	setBackgroundRole (QPalette::ColorRole role)

void	setBaseSize (const QSize &size)

void	setBaseSize (int basew, int baseh)

void	setContentsMargins (const QMargins &margins)

void	setContentsMargins (int left, int top, int right, int bottom)

void	setContextMenuPolicy (Qt::ContextMenuPolicy policy)

void	setCursor (const QCursor &cursor)

void	setEditFocus (bool enable)

void	setFixedHeight (int h)

void	setFixedSize (const QSize &size)

void	setFixedSize (int w, int h)

void	setFixedWidth (int w)

void	setFocus (Qt::FocusReason reason)

void	setFocusPolicy (Qt::FocusPolicy policy)

void	setFocusProxy (QWidget *widget)

void	setFont (const QFont &font)

void	setForegroundRole (QPalette::ColorRole role)

void	setGeometry (const QRect &rect)

void	setGeometry (int x, int y, int w, int h)

void	setGraphicsEffect (QGraphicsEffect *effect)

void	setInputMethodHints (Qt::InputMethodHints hints)

void	setLayout (QLayout *layout)

void	setLayoutDirection (Qt::LayoutDirection direction)

void	setLocale (const QLocale &locale)

void	setMask (const QBitmap &bitmap)

void	setMask (const QRegion &region)

void	setMaximumHeight (int maxh)

void	setMaximumSize (const QSize &size)

void	setMaximumSize (int maxw, int maxh)

void	setMaximumWidth (int maxw)

void	setMinimumHeight (int minh)

void	setMinimumSize (const QSize &size)

void	setMinimumSize (int minw, int minh)

void	setMinimumWidth (int minw)

void	setMouseTracking (bool enable)

void	setPalette (const QPalette &palette)

void	setParent (QWidget *parent)

void	setParent (QWidget *parent, Qt::WindowFlags flags)

void	setShortcutAutoRepeat (int id, bool enable=true)

void	setShortcutEnabled (int id, bool enable=true)

void	setSizeIncrement (const QSize &size)

void	setSizeIncrement (int w, int h)

void	setSizePolicy (QSizePolicy policy)

void	setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical)

void	setStatusTip (const QString &data)

void	setStyle (QStyle *style)

void	setToolTip (const QString &data)

void	setToolTipDuration (int msec)

void	setUpdatesEnabled (bool enable)

void	setWhatsThis (const QString &str)

void	setWindowFilePath (const QString &filePath)

void	setWindowFlags (Qt::WindowFlags flags)

void	setWindowIcon (const QIcon &icon)

void	setWindowModality (Qt::WindowModality windowModality)

void	setWindowOpacity (qreal level)

void	setWindowRole (const QString &role)

void	setWindowState (Qt::WindowStates windowState)

QSize	size () const

QSize	sizeIncrement () const

QSizePolicy	sizePolicy () const

void	stackUnder (QWidget *widget)

QString	statusTip () const

QStyle *	style () const

QString	styleSheet () const

bool	testAttribute (Qt::WidgetAttribute attribute) const

QString	toolTip () const

int	toolTipDuration () const

QWidget *	topLevelWidget () const

bool	underMouse () const

void	ungrabGesture (Qt::GestureType gestureType)

void	unsetCursor ()

void	unsetLayoutDirection ()

void	unsetLocale ()

void	update (const QRect &rect)

void	update (const QRegion &region)

void	update (int x, int y, int w, int h)

void	updateGeometry ()

bool	updatesEnabled () const

QRegion	visibleRegion () const

QString	whatsThis () const

int	width () const

QWidget *	window () const

QString	windowFilePath () const

Qt::WindowFlags	windowFlags () const

QWindow *	windowHandle () const

QIcon	windowIcon () const

Qt::WindowModality	windowModality () const

qreal	windowOpacity () const

QString	windowRole () const

Qt::WindowStates	windowState () const

QString	windowTitle () const

Qt::WindowType	windowType () const

WId	winId () const

int	x () const

int	y () const

Public Methods inherited from QObject
	QObject (QObject *parent=nullptr)

	~QObject ()

bool	blockSignals (bool block)

const QList< QObject * > &	children () const

bool	connect (const QObject *sender, const QString &signalMethod, const QString &location, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	connect (const QObject *sender, const QString &signalMethod, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

bool	disconnect (const QObject *receiver, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod, const QString &location, const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

bool	disconnect (const QString &signalMethod=QString (), const QObject *receiver=nullptr, const QString &slotMethod=QString ()) const

void	dumpObjectInfo ()

void	dumpObjectTree ()

QList< QString >	dynamicPropertyNames () const

virtual bool	event (QEvent *event)

virtual bool	eventFilter (QObject watched, QEvent event)

template<typename T >
T	findChild (const QString &childName=QString ()) const

template<class T >
QList< T >	findChildren (const QRegularExpression &regExp, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

template<class T >
QList< T >	findChildren (const QString &childName=QString (), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const

bool	inherits (const QString &className) const

void	installEventFilter (QObject *filterObj)

bool	isWidgetType () const

bool	isWindowType () const

void	killTimer (int id)

const QMetaObject *	metaObject () const

void	moveToThread (QThread *targetThread)

QString	objectName () const

QObject *	parent () const

template<class T = QVariant>
T	property (const QString &name) const

void	removeEventFilter (QObject *obj)

void	setObjectName (const QString &name)

void	setParent (QObject *parent)

bool	setProperty (const QString &name, const QVariant &value)

bool	signalsBlocked () const

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)

QThread *	thread () const

Public Methods inherited from QPaintDevice
virtual	~QPaintDevice ()

int	colorCount () const

int	depth () const

int	devicePixelRatio () const

qreal	devicePixelRatioF () const

int	height () const

int	heightMM () const

int	logicalDpiX () const

int	logicalDpiY () const

bool	paintingActive () const

int	physicalDpiX () const

int	physicalDpiY () const

int	width () const

int	widthMM () const

Protected Slots
void	setupViewport (QWidget *viewport)

Protected Slots inherited from QWidget
void	updateMicroFocus ()

Protected Methods
void	childEvent (QChildEvent *childEvent) override

bool	event (QEvent *event) override

bool	eventFilter (QObject object, QEvent event) override

void	paintEvent (QPaintEvent *paintEvent) override

void	resizeEvent (QResizeEvent *resizeEvent) override

void	scrollContentsBy (int dx, int dy) override

void	showEvent (QShowEvent *showEvent) override

void	timerEvent (QTimerEvent *timerEvent) override

bool	viewportEvent (QEvent *event) override

Protected Methods inherited from QAbstractScrollArea
void	contextMenuEvent (QContextMenuEvent *event) override

void	dragEnterEvent (QDragEnterEvent *event) override

void	dragLeaveEvent (QDragLeaveEvent *event) override

void	dragMoveEvent (QDragMoveEvent *event) override

void	dropEvent (QDropEvent *event) override

bool	event (QEvent *event) override

void	keyPressEvent (QKeyEvent *event) override

void	mouseDoubleClickEvent (QMouseEvent *event) override

void	mouseMoveEvent (QMouseEvent *event) override

void	mousePressEvent (QMouseEvent *event) override

void	mouseReleaseEvent (QMouseEvent *event) override

void	setViewportMargins (const QMargins &margins)

void	setViewportMargins (int left, int top, int right, int bottom)

QMargins	viewportMargins () const

virtual QSize	viewportSizeHint () const

void	wheelEvent (QWheelEvent *event) override

Protected Methods inherited from QFrame
void	changeEvent (QEvent *event) override

void	drawFrame (QPainter *painter)

bool	event (QEvent *event) override

void	initStyleOption (QStyleOptionFrame *option) const

Protected Methods inherited from QWidget
virtual void	actionEvent (QActionEvent *event)

virtual void	closeEvent (QCloseEvent *event)

void	create (WId window=0, bool initializeWindow=true, bool destroyOldWindow=true)

void	destroy (bool destroyWindow=true, bool destroySubWindows=true)

virtual void	enterEvent (QEvent *event)

bool	event (QEvent *event) override

virtual void	focusInEvent (QFocusEvent *event)

bool	focusNextChild ()

virtual bool	focusNextPrevChild (bool next)

virtual void	focusOutEvent (QFocusEvent *event)

bool	focusPreviousChild ()

virtual void	hideEvent (QHideEvent *event)

void	initPainter (QPainter *painter) const override

virtual void	inputMethodEvent (QInputMethodEvent *event)

virtual void	keyReleaseEvent (QKeyEvent *event)

virtual void	leaveEvent (QEvent *event)

int	metric (PaintDeviceMetric metric) const override

virtual void	moveEvent (QMoveEvent *event)

virtual bool	nativeEvent (const QByteArray &eventType, void message, long result)

virtual void	tabletEvent (QTabletEvent *event)

Protected Methods inherited from QObject
virtual void	childEvent (QChildEvent *event)

virtual void	connectNotify (const QMetaMethod &signalMethod) const

virtual void	customEvent (QEvent *event)

virtual void	disconnectNotify (const QMetaMethod &signalMethod) const

bool	isSignalConnected (const QMetaMethod &signalMethod) const

int	receivers (const QString &signal) const

QObject *	sender () const

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *event)

Protected Methods inherited from QPaintDevice
	QPaintDevice ()

Properties
	activationOrder

	background

	documentMode

	tabPosition

	tabsClosable

	tabShape

	tabsMovable

	viewMode

Properties inherited from QAbstractScrollArea
	horizontalScrollBarPolicy

	verticalScrollBarPolicy

Properties inherited from QFrame
	frameRect

	frameShadow

	frameShape

	frameWidth

	lineWidth

	midLineWidth

Properties inherited from QWidget
	acceptDrops

	accessibleDescription

	accessibleName

	autoFillBackground

	baseSize

	childrenRect

	childrenRegion

	contextMenuPolicy

	cursor

	enabled

	focus

	focusPolicy

	font

	frameGeometry

	frameSize

	fullScreen

	geometry

	height

	inputMethodHints

	isActiveWindow

	layoutDirection

	locale

	maximized

	maximumHeight

	maximumSize

	maximumWidth

	minimized

	minimumHeight

	minimumSize

	minimumSizeHint

	minimumWidth

	modal

	mouseTracking

	normalGeometry

	palette

	pos

	rect

	size

	sizeHint

	sizeIncrement

	sizePolicy

	statusTip

	styleSheet

	toolTip

	updatesEnabled

	visible

	whatsThis

	width

	windowFilePath

	windowFlags

	windowIcon

	windowIconText

	windowModality

	windowModified

	windowOpacity

	windowTitle

	x

	y

Properties inherited from QObject
	objectName

Additional Inherited Members
Static Public Methods inherited from QWidget
static QWidget *	createWindowContainer (QWindow window, QWidget parent=nullptr, Qt::WindowFlags flags=Qt::EmptyFlag)

static QWidget *	find (WId id)

static QWidget *	keyboardGrabber ()

static QWidget *	mouseGrabber ()

static void	setTabOrder (QWidget firstWidget, QWidget secondWidget)

Static Public Methods inherited from QObject
static bool	connect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

static bool	connect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection, const QString &location=QString ())

static bool	connect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod, Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...), Qt::ConnectionType type=Qt::AutoConnection)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	connect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotLambda, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const QMetaMethod &signalMethod, const QObject receiver, const QMetaMethod &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, const QString &signalMethod, const QString &location, const QObject receiver, const QString &slotMethod)

static bool	disconnect (const QObject sender, std::nullptr_t, const QObject receiver, std::nullptr_t)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class SlotClass , class... SlotArgs, class SlotReturn >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver receiver, SlotReturn (SlotClass::slotMethod)(SlotArgs...))

template<class Sender , class SignalClass , class... SignalArgs, class Receiver >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, std::nullptr_t slotMethod=nullptr)

template<class Sender , class SignalClass , class... SignalArgs, class Receiver , class T >
static bool	disconnect (const Sender sender, void (SignalClass::signalMethod)(SignalArgs...), const Receiver *receiver, T slotMethod)

static QMetaObject &	staticMetaObject ()

static QString	tr (const char text, const char comment=nullptr, std::optional< int > numArg=std::optional< int >())

Related Functions inherited from QWidget
	QWidgetList

	WId

Related Functions inherited from QObject
T	qobject_cast (QObject *object)

	QObjectList

Detailed Description

The QMdiArea widget provides an area in which MDI windows are displayed. The class is like a window manager for MDI windows. For instance, it draws the windows it manages on itself and arranges them in a cascading or tile pattern. QMdiArea is commonly used as the center widget in a QMainWindow to create MDI applications, but can also be placed in any layout. The following code adds an area to a main window.

QMainWindow *mainWindow = new QMainWindow;

mainWindow->setCentralWidget(mdiArea);

Unlike the window managers for top-level windows, all window flags (Qt::WindowFlags) are supported by QMdiArea as long as the flags are supported by the current widget style. If a specific flag is not supported by the style (e.g., the Qt::WindowShadeButtonHint), you can still shade the window with showShaded().

Subwindows in QMdiArea are instances of QMdiSubWindow and they are added to an MDI area with addSubWindow(). It is common to pass a QWidget to this method however it is also possible to pass a QMdiSubWindow directly. Since this class inherits from QWidget you can use the same API methods for a normal top level window. QMdiSubWindow also has behavior that is specific to MDI windows. See the QMdiSubWindow class description for more details.

A subwindow becomes active when it receives keyboard focus or when setFocus() is called. The MDI area emits the subWindowActivated() signal when the active window changes, and the activeSubWindow() method returns the active subwindow.

The method subWindowList() returns a list of all subwindows. This information could be used in a popup menu containing a list of windows, for example.

The subwindows are sorted by the current WindowOrder. This is used for the subWindowList() and for activateNextSubWindow() and activatePreviousSubWindow(). Also, it is used when cascading or tiling the windows with cascadeSubWindows() and tileSubWindows().

QMdiArea provides two built-in layout strategies for subwindows: cascadeSubWindows() and tileSubWindows(). Both are slots and are easily connected to menu entries.

Note: The default scroll bar property for QMdiArea is Qt::ScrollBarAlwaysOff.

See also: QMdiSubWindow

Member Typedef Documentation

QMdiArea::AreaOptions

Typedef for QFlags<AreaOption>. Refer to QMdiArea::AreaOption for documentation.

Member Enumeration Documentation

enum QMdiArea::AreaOption

This enum describes options that customize the behavior of the QMdiArea.

Constant	Value	Description
`QMdiArea::DontMaximizeSubWindowOnActivation`	`0x1`	When the active subwindow is maximized the default behavior is to maximize the next subwindow that is activated. Set this option if you do not want this behavior.

See also: setViewMode()

enum QMdiArea::ViewMode

This enum describes the view mode of the area. For example how a sub windows will be displayed.

Constant	Value	Description
`QMdiArea::SubWindowView`	`0`	Display sub-windows with window frames (default).
`QMdiArea::TabbedView`	`1`	Display sub-windows with tabs in a tab bar.

See also: setViewMode()

enum QMdiArea::WindowOrder

Specifies the criteria to use for ordering the list of child windows returned by subWindowList(). The methods cascadeSubWindows() and tileSubWindows() follow this order when arranging the windows.

Constant	Value	Description
`QMdiArea::CreationOrder`	`0`	Windows are returned in the order of their creation.
`QMdiArea::StackingOrder`	`1`	Windows are returned in the order they are stacked, with the top-most window being last in the list.
`QMdiArea::ActivationHistoryOrder`	`2`	Windows are returned in the order they were activated.

See also: subWindowList()

Constructor & Destructor Documentation

QMdiArea::QMdiArea ( QWidget * parent = nullptr )

Constructs an empty mdi area. The parent object is passed to the QWidget constructor.

QMdiArea::~QMdiArea ( )

Destroys the MDI area.

Method Documentation

void QMdiArea::activateNextSubWindow ( )

slot

Gives the keyboard focus to another window in the list of child windows. The window activated will be the next one determined by the current activation order.

See also: activatePreviousSubWindow(), QMdiArea::WindowOrder

void QMdiArea::activatePreviousSubWindow ( )

slot

Gives the keyboard focus to another window in the list of child windows. The window activated will be the previous one determined by the current activation order.

See also: activateNextSubWindow(), QMdiArea::WindowOrder

WindowOrder QMdiArea::activationOrder ( ) const

Returns the value of the property.

QMdiSubWindow * QMdiArea::activeSubWindow ( ) const

Returns a pointer to the current active subwindow. If no window is currently active, 0 is returned.

Subwindows are treated as top-level windows with respect to window state, i.e., if a widget outside the MDI area is the active window, no subwindow will be active. Note that if a widget in the window in which the MDI area lives gains focus, the window will be activated.

See also: setActiveSubWindow(), Qt::WindowState

QMdiSubWindow * QMdiArea::addSubWindow	(	QWidget *	widget,
		Qt::WindowFlags	flags = `Qt::EmptyFlag`
	)

Adds widget as a new subwindow to the MDI area. The widget can be either a QMdiSubWindow or another QWidget, in which case the MDI area will create a subwindow and set the widget as the internal widget. If flags is not a nullptr it will override the flags set on the widget. Returns the QMdiSubWindow that is added to the MDI area.

When you create your own subwindow, you must set the Qt::WA_DeleteOnClose widget attribute if you want the window to be deleted when closed in the MDI area. If not, the window will be hidden and the MDI area will not activate the next subwindow.

Once the subwindow has been added, its parent will be the viewport widget of the QMdiArea.

QMdiArea mdiArea;
QMdiSubWindow *subWindow1 = new QMdiSubWindow;
subWindow1->setWidget(internalWidget1);
subWindow1->setAttribute(Qt::WA_DeleteOnClose);
mdiArea.addSubWindow(subWindow1);
 
QMdiSubWindow *subWindow2 = mdiArea.addSubWindow(internalWidget2);

See also: removeSubWindow()

QBrush QMdiArea::background ( ) const

Returns the value of the property.

void QMdiArea::cascadeSubWindows ( )

slot

Arranges all the child windows in a cascade pattern.

See also: tileSubWindows()

void QMdiArea::childEvent ( QChildEvent * childEvent )

overrideprotected

Reimplemented from QObject::childEvent()

void QMdiArea::closeActiveSubWindow ( )

slot

Closes the active subwindow.

See also: closeAllSubWindows()

void QMdiArea::closeAllSubWindows ( )

slot

Closes all subwindows by sending a QCloseEvent to each window. You may receive subWindowActivated() signals from subwindows before they are closed (if the MDI area activates the subwindow when another is closing).

Subwindows that ignore the close event will remain open.

See also: closeActiveSubWindow()

QMdiSubWindow * QMdiArea::currentSubWindow ( ) const

Returns a pointer to the current subwindow or a nullptr if there is no current subwindow. This method will return the same as activeSubWindow() if the QApplication containing QMdiArea is active.

See also: activeSubWindow(), QApplication::activeWindow()

bool QMdiArea::documentMode ( ) const

Returns the value of the property.

bool QMdiArea::event ( QEvent * event )

overrideprotected

Reimplemented from QWidget::event()

bool QMdiArea::eventFilter	(	QObject *	object,
		QEvent *	event
	)

overrideprotected

Reimplemented from QWidget::eventFilter()

QSize QMdiArea::minimumSizeHint ( ) const

overridevirtual

Reimplemented from QAbstractScrollArea::minimumSizeHint()

void QMdiArea::paintEvent ( QPaintEvent * paintEvent )

overrideprotectedvirtual

Reimplemented from QAbstractScrollArea::paintEvent()

void QMdiArea::removeSubWindow ( QWidget * widget )

Removes widget from the MDI area. The widget must either be a QMdiSubWindow or a widget which is the internal widget of a subwindow. The widget is never actually deleted by QMdiArea. If the given widget is a QMdiSubWindow then its parent is set to a nullptr.

See also: addSubWindow()

void QMdiArea::resizeEvent ( QResizeEvent * resizeEvent )

overrideprotectedvirtual

Reimplemented from QAbstractScrollArea::resizeEvent()

void QMdiArea::scrollContentsBy	(	int	dx,
		int	dy
	)

overrideprotectedvirtual

Reimplemented from QAbstractScrollArea::scrollContentsBy()

void QMdiArea::setActivationOrder ( WindowOrder order )

Sets the value of the property to order.

void QMdiArea::setActiveSubWindow ( QMdiSubWindow * window )

slot

Activates the subwindow window. If window is a nullptr any current active window is deactivated.

See also: activeSubWindow()

void QMdiArea::setBackground ( const QBrush & background )

Sets the value of the property to background.

void QMdiArea::setDocumentMode ( bool enable )

Sets the value of the property to enable.

void QMdiArea::setOption	(	AreaOption	option,
		bool	on = `true`
	)

If on true then option is enabled on the MDI area, otherwise it is disabled. Refer to AreaOption for the effect of each option.

See also: AreaOption, testOption()

void QMdiArea::setTabPosition ( QTabWidget::TabPosition position )

Sets the value of the property to position.

void QMdiArea::setTabsClosable ( bool closeable )

Sets the value of the property to closeable.

void QMdiArea::setTabShape ( QTabWidget::TabShape shape )

Sets the value of the property to shape.

void QMdiArea::setTabsMovable ( bool movable )

Sets the value of the property to moveable.

void QMdiArea::setupViewport ( QWidget * viewport )

protectedslot

This slot is called by QAbstractScrollArea after setViewport() has been called. Reimplement this method in a subclass of QMdiArea to initialize the new viewport before it is used.

See also: setViewport()

void QMdiArea::setViewMode ( ViewMode mode )

Sets the value of the property to mode.

void QMdiArea::showEvent ( QShowEvent * showEvent )

overrideprotectedvirtual

Reimplemented from QWidget::showEvent()

QSize QMdiArea::sizeHint ( ) const

overridevirtual

Reimplemented from QAbstractScrollArea::sizeHint()

void QMdiArea::subWindowActivated ( QMdiSubWindow * window )

signal

QMdiArea emits this signal after window has been activated. When window is 0, QMdiArea has just deactivated its last active window, and there are no active windows on the workspace.

See also: QMdiArea::activeSubWindow()

QList< QMdiSubWindow * > QMdiArea::subWindowList ( WindowOrder order = CreationOrder ) const

Returns a list of all subwindows in the MDI area. If order is CreationOrder (the default), the windows are sorted in the order in which they were inserted into the workspace. If order is StackingOrder, the windows are listed in their stacking order, with the topmost window as the last item in the list. If order is ActivationHistoryOrder, the windows are listed according to their recent activation history.

See also: WindowOrder

QTabWidget::TabPosition QMdiArea::tabPosition ( ) const

Returns the value of the property.

bool QMdiArea::tabsClosable ( ) const

Returns the value of the property.

QTabWidget::TabShape QMdiArea::tabShape ( ) const

Returns the value of the property.

bool QMdiArea::tabsMovable ( ) const

Returns the value of the property.

bool QMdiArea::testOption ( AreaOption option ) const

Returns true if option is enabled, otherwise returns false.

See also: AreaOption, setOption()

void QMdiArea::tileSubWindows ( )

slot

Arranges all child windows in a tile pattern.

See also: cascadeSubWindows()

void QMdiArea::timerEvent ( QTimerEvent * timerEvent )

overrideprotected

Reimplemented from QObject::timerEvent()

ViewMode QMdiArea::viewMode ( ) const

Returns the value of the property.

bool QMdiArea::viewportEvent ( QEvent * event )

overrideprotectedvirtual

Reimplemented from QAbstractScrollArea::viewportEvent()

Property Documentation

QMdiArea::activationOrder

This property specifies the ordering criteria for the list of subwindows returned by subWindowList(). By default, it is the window creation order.

See also: subWindowList()

Properties	Class Methods
read	activationOrder
write	setActivationOrder

QMdiArea::background

This property sets the background brush for the workspace area itself. By default, it is a gray color, but can be any brush (e.g., colors, gradients or pixmaps).

Properties	Class Methods
read	background
write	setBackground

QMdiArea::documentMode

This property holds whether the tab bar is set to document mode in tabbed view mode. Document mode is disabled by default.

See also: QTabBar::documentMode, setViewMode()

Properties	Class Methods
read	documentMode
write	setDocumentMode

QMdiArea::tabPosition

This property holds the position of the tabs in tabbed view mode. Possible values for this property are described by the QTabWidget::TabPosition enum.

See also: QTabWidget::TabPosition, setViewMode()

Properties	Class Methods
read	tabPosition
write	setTabPosition

QMdiArea::tabsClosable

This property holds whether the tab bar should place close buttons on each tab in tabbed view mode. Tabs are not closeable by default.

See also: QTabBar::tabsClosable, setViewMode()

Properties	Class Methods
read	tabsClosable
write	setTabsClosable

QMdiArea::tabShape

This property holds the shape of the tabs in tabbed view mode. Possible values for this property are QTabWidget::Rounded (default) or QTabWidget::Triangular.

See also: QTabWidget::TabShape, setViewMode()

Properties	Class Methods
read	tabShape
write	setTabShape

QMdiArea::tabsMovable

This property holds whether the user can move the tabs within the tabbar area in tabbed view mode. Tabs are not movable by default.

See also: QTabBar::movable, setViewMode()

Properties	Class Methods
read	tabsMovable
write	setTabsMovable

QMdiArea::viewMode

This property holds the way sub-windows are displayed in the QMdiArea. By default, the SubWindowView is used to display sub-windows.

See also: ViewMode, setTabShape(), setTabPosition()

Properties	Class Methods
read	viewMode
write	setViewMode

Public Typedefs

Public Types

Public Signals

Public Slots

Public Methods

Protected Slots

Protected Methods

Properties

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Method Documentation

Property Documentation