Provides a way to scroll some other widget. More...

Inheritance diagram for QScrollArea:

Public Methods
	QScrollArea (QWidget *parent=nullptr)

	~QScrollArea ()

Qt::Alignment	alignment () const

void	ensureVisible (int x, int y, int xmargin=50, int ymargin=50)

void	ensureWidgetVisible (QWidget *childWidget, int xmargin=50, int ymargin=50)

bool	focusNextPrevChild (bool next) override

void	setAlignment (Qt::Alignment alignment)

void	setWidget (QWidget *widget)

void	setWidgetResizable (bool resizable)

QSize	sizeHint () const override

QWidget *	takeWidget ()

QWidget *	widget () const

bool	widgetResizable () 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

QSize	minimumSizeHint () const override

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 Methods
bool	event (QEvent *event) override

bool	eventFilter (QObject object, QEvent event) override

void	resizeEvent (QResizeEvent *event) override

void	scrollContentsBy (int dx, int dy) override

QSize	viewportSizeHint () const 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	paintEvent (QPaintEvent *event) override

void	setViewportMargins (const QMargins &margins)

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

virtual bool	viewportEvent (QEvent *event)

QMargins	viewportMargins () 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

void	paintEvent (QPaintEvent *event) override

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 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	showEvent (QShowEvent *event)

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
	alignment

	widgetResizable

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

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 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 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 ()

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 >())

Protected Slots inherited from QWidget
void	updateMicroFocus ()

Related Functions inherited from QWidget
	QWidgetList

	WId

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

	QObjectList

Detailed Description

The QScrollArea class provides a way to scroll some other widget.

A scroll area is used to display the contents of a child widget within a frame. If the child widget is larger then the frame frame scroll bars can be added so the entire area of the child widget can be viewed in smaller sections. The child widget is specified using setWidget().

Example

This code creates a scroll area containing a QLabel object, An image is attached to the label. The appearance of the scroll bars depend on the scroll bar policies. You can control the appearance of the scroll bars using the inherited functionality in the properties QAbstractScrollArea::horizontalScrollBarPolicy and QAbstractScrollArea::verticalScrollBarPolicy.

If you want the scroll bars to adjust dynamically when the contents of the scroll area changes, use the horizontalScrollBar() and verticalScrollBar() methods. Set the scroll bar values whenever the scroll area's contents change using the QScrollBar::setValue() method.

The methods ensureVisible() and ensureWidgetVisible() ensure a certain region of the contents is visible inside the viewport.

QLabel *imageLabel = new QLabel;
 
QImage image("happyguy.png");
imageLabel->setPixmap(QPixmap::fromImage(image));
 
scrollArea = new QScrollArea;
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setWidget(imageLabel);

Size Hints and Layouts

When using a scroll area to display the contents of a custom widget it is important to ensure the size hint of the child widget is set to a suitable value. If a standard QWidget is used for the child widget, it may be necessary to call QWidget::setMinimumSize() to ensure that the contents of the widget are shown correctly within the scroll area.

If a scroll area is used to display the contents of a widget that contains child widgets arranged in a layout, it is important to realize that the size policy of the layout will also determine the size of the widget. This is especially useful to know if you intend to dynamically change the contents of the layout. In this case, setting the layout's size constraint property to one which provides constraints on the minimum and/or maximum size of the layout will cause the size of the scroll area to be updated whenever the contents of the layout changes.

See also: QAbstractScrollArea, QScrollBar

Constructor & Destructor Documentation

QScrollArea::QScrollArea ( QWidget * parent = nullptr )

explicit

Constructs an empty scroll area with the given parent.

See also: setWidget()

QScrollArea::~QScrollArea ( )

Destroys the scroll area and its child widget.

See also: setWidget()

Method Documentation

Qt::Alignment QScrollArea::alignment ( ) const

Returns the value of the property.

void QScrollArea::ensureVisible	(	int	x,
		int	y,
		int	xmargin = `50`,
		int	ymargin = `50`
	)

Scrolls the contents of the scroll area so that the point (x, y) is visible inside the region of the viewport with margins specified in pixels by xmargin and ymargin. If the specified point can not be reached, the contents are scrolled to the nearest valid position. The default value for both margins is 50 pixels.

void QScrollArea::ensureWidgetVisible	(	QWidget *	childWidget,
		int	xmargin = `50`,
		int	ymargin = `50`
	)

Scrolls the contents of the scroll area so that the childWidget of QScrollArea::widget() is visible inside the viewport with margins specified in pixels by xmargin and ymargin. If the specified point can not be reached, the contents are scrolled to the nearest valid position. The default value for both margins is 50 pixels.

bool QScrollArea::event ( QEvent * event )

overrideprotected

Reimplemented from QAbstractScrollArea::event()

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

overrideprotected

Reimplemented from QFrame::eventFilter()

bool QScrollArea::focusNextPrevChild ( bool next )

overridevirtual

Reimplemented from QWidget::focusNextPrevChild()

void QScrollArea::resizeEvent ( QResizeEvent * event )

overrideprotectedvirtual

Reimplemented from QAbstractScrollArea::resizeEvent()

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

overrideprotectedvirtual

Reimplemented from QAbstractScrollArea::scrollContentsBy()

void QScrollArea::setAlignment ( Qt::Alignment alignment )

Sets the value of the property to alignment.

void QScrollArea::setWidget ( QWidget * widget )

Sets the scroll area's widget. The widget becomes a child of the scroll area, and will be destroyed when the scroll area is deleted or when a new widget is set. The widget's autoFillBackground property will be set to true.

If the scroll area is visible when the widget is added, you must show() it explicitly.

You must add the layout of widget before you call this method. If you add it later, the widget will not be visible, regardless of when you show the scroll area. In this case, you can also not show() the widget later.

See also: widget()

void QScrollArea::setWidgetResizable ( bool resizable )

Sets the value of the property to resizable.

QSize QScrollArea::sizeHint ( ) const

overridevirtual

Reimplemented from QAbstractScrollArea::sizeHint()

QWidget * QScrollArea::takeWidget ( )

Removes the scroll area's widget, and passes ownership of the widget to the caller.

See also: widget()

QSize QScrollArea::viewportSizeHint ( ) const

overrideprotectedvirtual

Returns the value of the property.

Reimplemented from QAbstractScrollArea::viewportSizeHint()

QWidget * QScrollArea::widget ( ) const

Returns the scroll area's widget or nullptr if there is none.

See also: setWidget()

bool QScrollArea::widgetResizable ( ) const

Returns the value of the property.

Property Documentation

QScrollArea::alignment

This property holds the alignment of the scroll area's widget. By default, the widget stays rooted to the top-left corner of the scroll area.

Properties	Class Methods
read	alignment
write	setAlignment

QScrollArea::widgetResizable

This property holds whether the scroll area should resize the view widget.

If this property is set to false (the default), the scroll area honors the size of its widget. Regardless of this property, you can programmatically resize the widget using widget()->resize(), and the scroll area will automatically adjust itself to the new size.

If this property is set to true, the scroll area will automatically resize the widget in order to avoid scroll bars where they can be avoided, or to take advantage of extra space.

Properties	Class Methods
read	widgetResizable
write	setWidgetResizable

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