The QStackedLayout class provides a stack of widgets where only one widget is visible at a time. More...

#include <qstackedlayout.h>

Inheritance diagram for QStackedLayout:

Public Types
enum	StackingMode { StackOne, StackAll }
	This enum specifies how the layout handles its child widgets regarding their visibility. More...

Public Types inherited from QLayout
enum	SizeConstraint { SetDefaultConstraint, SetNoConstraint, SetMinimumSize, SetFixedSize, SetMaximumSize, SetMinAndMaxSize }
	The possible values are: More...

Public Slots
void	setCurrentIndex (int index)

void	setCurrentWidget (QWidget *w)
	Sets the current widget to be the specified widget. More...

Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Signals
void	currentChanged (int index)
	This signal is emitted whenever the current widget in the layout changes. More...

void	widgetRemoved (int index)
	This signal is emitted whenever a widget is removed from the layout. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Public Functions
void	addItem (QLayoutItem *item)
	Reimplemented Function More...

int	addWidget (QWidget *w)
	Adds the given widget to the end of this layout and returns the index position of the widget. More...

int	count () const
	the number of widgets contained in the layout More...

int	currentIndex () const

QWidget *	currentWidget () const
	Returns the current widget, or 0 if there are no widgets in this layout. More...

int	insertWidget (int index, QWidget *w)
	Inserts the given widget at the given index in this QStackedLayout. More...

QLayoutItem *	itemAt (int) const
	Reimplemented Function More...

QSize	minimumSize () const
	Reimplemented Function More...

	QStackedLayout ()
	Constructs a QStackedLayout with no parent. More...

	QStackedLayout (QWidget *parent)
	Constructs a new QStackedLayout with the given parent. More...

	QStackedLayout (QLayout *parentLayout)
	Constructs a new QStackedLayout and inserts it into the given parentLayout. More...

void	setGeometry (const QRect &rect)
	Reimplemented Function More...

void	setStackingMode (StackingMode stackingMode)

QSize	sizeHint () const
	Reimplemented Function More...

StackingMode	stackingMode () const

QLayoutItem *	takeAt (int)
	Reimplemented Function More...

QWidget *	widget (int) const
	Returns the widget at the given index, or 0 if there is no widget at the given position. More...

	~QStackedLayout ()
	Destroys this QStackedLayout. More...

Public Functions inherited from QLayout
bool	activate ()
	Redoes the layout for parentWidget() if necessary. More...

void	addWidget (QWidget *w)
	Adds widget w to this layout in a manner specific to the layout. More...

QMargins	contentsMargins () const
	Returns the margins used around the layout. More...

QRect	contentsRect () const
	Returns the layout's geometry() rectangle, but taking into account the contents margins. More...

Qt::Orientations	expandingDirections () const
	Returns whether this layout can make use of more space than sizeHint(). More...

QRect	geometry () const
	Reimplemented Function More...

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

virtual int	indexOf (QWidget *) const
	Searches for widget widget in this layout (not including child layouts). More...

void	invalidate ()
	Reimplemented Function More...

bool	isEmpty () const
	Reimplemented Function More...

bool	isEnabled () const
	Returns true if the layout is enabled; otherwise returns false. More...

QLayout *	layout ()
	Reimplemented Function More...

int	margin () const

QSize	maximumSize () const
	Returns the maximum size of this layout. More...

QWidget *	menuBar () const
	Returns the menu bar set for this layout, or 0 if no menu bar is set. More...

QWidget *	parentWidget () const
	Returns the parent widget of this layout, or 0 if this layout is not installed on any widget. More...

	QLayout (QWidget *parent)
	Constructs a new top-level QLayout, with parent parent. More...

	QLayout ()
	Constructs a new child QLayout. More...

void	removeItem (QLayoutItem *)
	Removes the layout item item from the layout. More...

void	removeWidget (QWidget *w)
	Removes the widget widget from the layout. More...

bool	setAlignment (QWidget *w, Qt::Alignment alignment)
	Sets the alignment for widget w to alignment and returns true if w is found in this layout (not including child layouts); otherwise returns false. More...

bool	setAlignment (QLayout *l, Qt::Alignment alignment)
	Sets the alignment for the layout l to alignment and returns true if l is found in this layout (not including child layouts); otherwise returns false. More...

void	setContentsMargins (int left, int top, int right, int bottom)
	Sets the left, top, right, and bottom margins to use around the layout. More...

void	setContentsMargins (const QMargins &margins)
	Sets the margins to use around the layout. More...

void	setEnabled (bool)
	Enables this layout if enable is true, otherwise disables it. More...

void	setMargin (int)

void	setMenuBar (QWidget *w)
	Tells the geometry manager to place the menu bar widget at the top of parentWidget(), outside QWidget::contentsMargins(). More...

void	setSizeConstraint (SizeConstraint)

void	setSpacing (int)

SizeConstraint	sizeConstraint () const

int	spacing () const

int	totalHeightForWidth (int w) const
	Also takes contentsMargins and menu bar into account. More...

QSize	totalMaximumSize () const
	Also takes contentsMargins and menu bar into account. More...

QSize	totalMinimumSize () const
	Also takes contentsMargins and menu bar into account. More...

QSize	totalSizeHint () const
	Also takes contentsMargins and menu bar into account. More...

void	update ()
	Updates the layout for parentWidget(). More...

	~QLayout ()
	Destroys the layout, deleting all child layouts. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Public Functions inherited from QLayoutItem
Qt::Alignment	alignment () const
	Returns the alignment of this item. More...

QSizePolicy::ControlTypes	controlTypes () const
	Returns the control type(s) for the layout item. More...

virtual bool	hasHeightForWidth () const
	Returns true if this layout's preferred height depends on its width; otherwise returns false. More...

virtual int	heightForWidth (int) const
	Returns the preferred height for this layout item, given the width w. More...

virtual int	minimumHeightForWidth (int) const
	Returns the minimum height this widget needs for the given width, w. More...

	QLayoutItem (Qt::Alignment alignment=0)
	Constructs a layout item with an alignment. More...

void	setAlignment (Qt::Alignment a)
	Sets the alignment of this item to alignment. More...

virtual QSpacerItem *	spacerItem ()
	If this item is a QSpacerItem, it is returned as a QSpacerItem; otherwise 0 is returned. More...

virtual QWidget *	widget ()
	If this item is a QWidget, it is returned as a QWidget; otherwise 0 is returned. More...

virtual	~QLayoutItem ()
	Destroys the QLayoutItem. More...

Properties
int	currentIndex
	the index position of the widget that is visible More...

StackingMode	stackingMode
	determines the way visibility of child widgets are handled. More...

Additional Inherited Members
Static Public Functions inherited from QLayout
static QSize	closestAcceptableSize (const QWidget *w, const QSize &s)
	Returns a size that satisfies all size constraints on widget, including heightForWidth() and that is as close as possible to size. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Functions inherited from QLayout
void	addChildLayout (QLayout *l)
	This function is called from `addLayout()` or `insertLayout()` functions in subclasses to add layout l as a sub-layout. More...

void	addChildWidget (QWidget *w)
	This function is called from `addWidget()` functions in subclasses to add w as a managed widget of a layout. More...

bool	adoptLayout (QLayout *layout)

QRect	alignmentRect (const QRect &) const
	Returns the rectangle that should be covered when the geometry of this layout is set to r, provided that this layout supports setAlignment(). More...

void	childEvent (QChildEvent *e)
	Reimplemented Function More...

	QLayout (QLayoutPrivate &d, QLayout , QWidget )

void	widgetEvent (QEvent *)
	Performs child widget layout when the parent widget is resized. More...

Protected Functions inherited from QObject
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Protected Variables inherited from QLayoutItem
Qt::Alignment	align

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

The QStackedLayout class provides a stack of widgets where only one widget is visible at a time.

QStackedLayout can be used to create a user interface similar to the one provided by QTabWidget. There is also a convenience QStackedWidget class built on top of QStackedLayout.

A QStackedLayout can be populated with a number of child widgets ("pages"). For example:

    QWidget *firstPageWidget = new QWidget;
    QWidget *secondPageWidget = new QWidget;
    QWidget *thirdPageWidget = new QWidget;
    QStackedLayout *stackedLayout = new QStackedLayout;
    stackedLayout->addWidget(firstPageWidget);
    stackedLayout->addWidget(secondPageWidget);
    stackedLayout->addWidget(thirdPageWidget);

QVBoxLayout *mainLayout = new QVBoxLayout;

mainLayout->addLayout(stackedLayout);

setLayout(mainLayout);

QStackedLayout provides no intrinsic means for the user to switch page. This is typically done through a QComboBox or a QListWidget that stores the titles of the QStackedLayout's pages. For example:

    QComboBox *pageComboBox = new QComboBox;
    pageComboBox->addItem(tr("Page 1"));
    pageComboBox->addItem(tr("Page 2"));
    pageComboBox->addItem(tr("Page 3"));
    connect(pageComboBox, SIGNAL(activated(int)),
            stackedLayout, SLOT(setCurrentIndex(int)));

When populating a layout, the widgets are added to an internal list. The indexOf() function returns the index of a widget in that list. The widgets can either be added to the end of the list using the addWidget() function, or inserted at a given index using the insertWidget() function. The removeWidget() function removes the widget at the given index from the layout. The number of widgets contained in the layout, can be obtained using the count() function.

The widget() function returns the widget at a given index position. The index of the widget that is shown on screen is given by currentIndex() and can be changed using setCurrentIndex(). In a similar manner, the currently shown widget can be retrieved using the currentWidget() function, and altered using the setCurrentWidget() function.

Whenever the current widget in the layout changes or a widget is removed from the layout, the currentChanged() and widgetRemoved() signals are emitted respectively.

See also: QStackedWidget, QTabWidget

Definition at line 55 of file qstackedlayout.h.

Enumerations

◆ StackingMode

enum QStackedLayout::StackingMode

This enum specifies how the layout handles its child widgets regarding their visibility.

Since: 4.4

StackOne Only the current widget is visible. This is the default.

StackAll All widgets are visible. The current widget is merely raised.

Enumerator
StackOne
StackAll

Definition at line 65 of file qstackedlayout.h.

                       {
         StackOne,
         StackAll
     };

Constructors and Destructors

◆ QStackedLayout() [1/3]

QStackedLayout::QStackedLayout ( )

Constructs a QStackedLayout with no parent.

This QStackedLayout must be installed on a widget later on to become effective.

See also: addWidget(), insertWidget()

Definition at line 153 of file qstackedlayout.cpp.

     : QLayout(*new QStackedLayoutPrivate, 0, 0)
 {
 }

◆ QStackedLayout() [2/3]

QStackedLayout::QStackedLayout ( QWidget * parent )

explicit

Constructs a new QStackedLayout with the given parent.

This layout will install itself on the parent widget and manage the geometry of its children.

Definition at line 164 of file qstackedlayout.cpp.

     : QLayout(*new QStackedLayoutPrivate, 0, parent)
 {
 }

◆ QStackedLayout() [3/3]

QStackedLayout::QStackedLayout ( QLayout * parentLayout )

explicit

Constructs a new QStackedLayout and inserts it into the given parentLayout.

Definition at line 173 of file qstackedlayout.cpp.

     : QLayout(*new QStackedLayoutPrivate, parentLayout, 0)
 {
 }

◆ ~QStackedLayout()

QStackedLayout::~QStackedLayout ( )

Destroys this QStackedLayout.

Note that the layout's widgets are not destroyed.

Definition at line 182 of file qstackedlayout.cpp.

 {
     Q_D(QStackedLayout);
     qDeleteAll(d->list);
 }

Functions

◆ addItem()

void QStackedLayout::addItem ( QLayoutItem * item )

virtual

Reimplemented Function

Implements QLayout.

Definition at line 429 of file qstackedlayout.cpp.

 {
     QWidget *widget = item->widget();
     if (widget) {
         addWidget(widget);
         delete item;
     } else {
         qWarning("QStackedLayout::addItem: Only widgets can be added");
     }
 }

◆ addWidget()

int QStackedLayout::addWidget ( QWidget * widget )

Adds the given widget to the end of this layout and returns the index position of the widget.

If the QStackedLayout is empty before this function is called, the given widget becomes the current widget.

See also: insertWidget(), removeWidget(), setCurrentWidget()

Definition at line 197 of file qstackedlayout.cpp.

Referenced by addItem().

 {
     Q_D(QStackedLayout);
     return insertWidget(d->list.count(), widget);
 }

◆ count()

int QStackedLayout::count ( ) const

virtual

the number of widgets contained in the layout

See also: currentIndex(), widget()

Implements QLayout.

Definition at line 419 of file qstackedlayout.cpp.

Referenced by QStackedLayoutHFW::hasHeightForWidth(), and QStackedLayoutHFW::heightForWidth().

 {
     Q_D(const QStackedLayout);
     return d->list.size();
 }

◆ currentChanged

void QStackedLayout::currentChanged ( int index )

signal

This signal is emitted whenever the current widget in the layout changes.

The index specifies the index of the new current widget, or -1 if there isn't a new one (for example, if there are no widgets in the QStackedLayout)

See also: currentWidget(), setCurrentWidget()

Referenced by setCurrentIndex(), and takeAt().

◆ currentIndex()

int QStackedLayout::currentIndex ( ) const

Referenced by setCurrentIndex(), and setStackingMode().

◆ currentWidget()

QWidget * QStackedLayout::currentWidget ( ) const

Returns the current widget, or 0 if there are no widgets in this layout.

See also: currentIndex(), setCurrentWidget()

Definition at line 390 of file qstackedlayout.cpp.

Referenced by setCurrentIndex(), setGeometry(), and setStackingMode().

 {
     Q_D(const QStackedLayout);
     return d->index >= 0 ? d->list.at(d->index)->widget() : 0;
 }

◆ insertWidget()

int QStackedLayout::insertWidget	(	int	index,
		QWidget *	widget
	)

Inserts the given widget at the given index in this QStackedLayout.

If index is out of range, the widget is appended (in which case it is the actual index of the widget that is returned).

If the QStackedLayout is empty before this function is called, the given widget becomes the current widget.

Inserting a new widget at an index less than or equal to the current index will increment the current index, but keep the current widget.

See also: addWidget(), removeWidget(), setCurrentWidget()

Definition at line 217 of file qstackedlayout.cpp.

Referenced by addWidget().

 {
     Q_D(QStackedLayout);
     addChildWidget(widget);
     index = qMin(index, d->list.count());
     if (index < 0)
         index = d->list.count();
     QWidgetItem *wi = QLayoutPrivate::createWidgetItem(this, widget);
     d->list.insert(index, wi);
     invalidate();
     if (d->index < 0) {
         setCurrentIndex(index);
     } else {
         if (index <= d->index)
             ++d->index;
         if (d->stackingMode == StackOne)
             widget->hide();
         widget->lower();
     }
     return index;
 }

◆ itemAt()

QLayoutItem * QStackedLayout::itemAt ( int index ) const

virtual

Reimplemented Function

Implements QLayout.

Definition at line 242 of file qstackedlayout.cpp.

Referenced by QStackedLayoutHFW::hasHeightForWidth(), and QStackedLayoutHFW::heightForWidth().

 {
     Q_D(const QStackedLayout);
     return d->list.value(index);
 }

◆ minimumSize()

QSize QStackedLayout::minimumSize ( ) const

virtual

Reimplemented Function

Reimplemented from QLayout.

Definition at line 464 of file qstackedlayout.cpp.

Referenced by QStackedLayoutHFW::heightForWidth().

 {
     Q_D(const QStackedLayout);
     QSize s(0, 0);
     int n = d->list.count();
 
     for (int i = 0; i < n; ++i)
         if (QWidget *widget = d->list.at(i)->widget())
             s = s.expandedTo(qSmartMinSize(widget));
     return s;
 }

◆ setCurrentIndex

void QStackedLayout::setCurrentIndex ( int index )

slot

Definition at line 298 of file qstackedlayout.cpp.

Referenced by insertWidget(), setCurrentWidget(), and takeAt().

 {
     Q_D(QStackedLayout);
     QWidget *prev = currentWidget();
     QWidget *next = widget(index);
     if (!next || next == prev)
         return;
 
     bool reenableUpdates = false;
     QWidget *parent = parentWidget();
 
     if (parent && parent->updatesEnabled()) {
         reenableUpdates = true;
         parent->setUpdatesEnabled(false);
     }
 
     QPointer<QWidget> fw = parent ? parent->window()->focusWidget() : 0;
     const bool focusWasOnOldPage = fw && (prev && prev->isAncestorOf(fw));
 
     if (prev) {
         prev->clearFocus();
         if (d->stackingMode == StackOne)
             prev->hide();
     }
 
     d->index = index;
     next->raise();
     next->show();
 
     // try to move focus onto the incoming widget if focus
     // was somewhere on the outgoing widget.
 
     if (parent) {
         if (focusWasOnOldPage) {
             // look for the best focus widget we can find
             if (QWidget *nfw = next->focusWidget())
                 nfw->setFocus();
             else {
                 // second best: first child widget in the focus chain
                 if (QWidget *i = fw) {
                     while ((i = i->nextInFocusChain()) != fw) {
                         if (((i->focusPolicy() & Qt::TabFocus) == Qt::TabFocus)
                             && !i->focusProxy() && i->isVisibleTo(next) && i->isEnabled()
                             && next->isAncestorOf(i)) {
                             i->setFocus();
                             break;
                         }
                     }
                     // third best: incoming widget
                     if (i == fw )
                         next->setFocus();
                 }
             }
         }
     }
     if (reenableUpdates)
         parent->setUpdatesEnabled(true);
     emit currentChanged(index);
 }

◆ setCurrentWidget

void QStackedLayout::setCurrentWidget ( QWidget * widget )

slot

Sets the current widget to be the specified widget.

The new current widget must already be contained in this stacked layout.

See also: setCurrentIndex(), currentWidget()

Definition at line 373 of file qstackedlayout.cpp.

 {
     int index = indexOf(widget);
     if (index == -1) {
         qWarning("QStackedLayout::setCurrentWidget: Widget %p not contained in stack", widget);
         return;
     }
     setCurrentIndex(index);
 }

◆ setGeometry()

void QStackedLayout::setGeometry ( const QRect & rect )

virtual

Reimplemented Function

Reimplemented from QLayout.

Definition at line 479 of file qstackedlayout.cpp.

 {
     Q_D(QStackedLayout);
     switch (d->stackingMode) {
     case StackOne:
         if (QWidget *widget = currentWidget())
             widget->setGeometry(rect);
         break;
     case StackAll:
         if (const int n = d->list.count())
             for (int i = 0; i < n; ++i)
                 if (QWidget *widget = d->list.at(i)->widget())
                     widget->setGeometry(rect);
         break;
     }
 }

◆ setStackingMode()

void QStackedLayout::setStackingMode ( StackingMode stackingMode )

Definition at line 534 of file qstackedlayout.cpp.

 {
     Q_D(QStackedLayout);
     if (d->stackingMode == stackingMode)
         return;
     d->stackingMode = stackingMode;
 
     const int n = d->list.count();
     if (n == 0)
         return;
 
     switch (d->stackingMode) {
     case StackOne:
         if (const int idx = currentIndex())
             for (int i = 0; i < n; ++i)
                 if (QWidget *widget = d->list.at(i)->widget())
                     widget->setVisible(i == idx);
         break;
     case StackAll: { // Turn overlay on: Make sure all widgets are the same size
         QRect geometry;
         if (const QWidget *widget = currentWidget())
             geometry = widget->geometry();
         for (int i = 0; i < n; ++i)
             if (QWidget *widget = d->list.at(i)->widget()) {
                 if (!geometry.isNull())
                     widget->setGeometry(geometry);
                 widget->setVisible(true);
             }
     }
         break;
     }
 }

◆ sizeHint()

QSize QStackedLayout::sizeHint ( ) const

virtual

Reimplemented Function

Implements QLayoutItem.

Definition at line 443 of file qstackedlayout.cpp.

 {
     Q_D(const QStackedLayout);
     QSize s(0, 0);
     int n = d->list.count();
 
     for (int i = 0; i < n; ++i)
         if (QWidget *widget = d->list.at(i)->widget()) {
             QSize ws(widget->sizeHint());
             if (widget->sizePolicy().horizontalPolicy() == QSizePolicy::Ignored)
                 ws.setWidth(0);
             if (widget->sizePolicy().verticalPolicy() == QSizePolicy::Ignored)
                 ws.setHeight(0);
             s = s.expandedTo(ws);
         }
     return s;
 }

◆ stackingMode()

StackingMode QStackedLayout::stackingMode ( ) const

Referenced by setGeometry(), and setStackingMode().

◆ takeAt()

QLayoutItem * QStackedLayout::takeAt ( int index )

virtual

Reimplemented Function

Implements QLayout.

Definition at line 264 of file qstackedlayout.cpp.

 {
     Q_D(QStackedLayout);
     if (index <0 || index >= d->list.size())
         return 0;
     QLayoutItem *item = d->list.takeAt(index);
     if (index == d->index) {
         d->index = -1;
         if ( d->list.count() > 0 ) {
             int newIndex = (index == d->list.count()) ? index-1 : index;
             setCurrentIndex(newIndex);
         } else {
             emit currentChanged(-1);
         }
     } else if (index < d->index) {
         --d->index;
     }
     emit widgetRemoved(index);
     if (item->widget() && !qt_wasDeleted(item->widget()))
         item->widget()->hide();
     return item;
 }

◆ widget()

QWidget * QStackedLayout::widget ( int index ) const

Returns the widget at the given index, or 0 if there is no widget at the given position.

Warning: This function is not part of the public interface.

See also: currentWidget(), indexOf()

Definition at line 402 of file qstackedlayout.cpp.

 {
     Q_D(const QStackedLayout);
      if (index < 0 || index >= d->list.size())
         return 0;
     return d->list.at(index)->widget();
 }

◆ widgetRemoved

void QStackedLayout::widgetRemoved ( int index )

signal

This signal is emitted whenever a widget is removed from the layout.

The widget's index is passed as parameter.

See also: removeWidget()

Referenced by takeAt().

Properties

◆ currentIndex

int QStackedLayout::currentIndex

private

the index position of the widget that is visible

The current index is -1 if there is no current widget.

See also: currentWidget(), indexOf()

Definition at line 60 of file qstackedlayout.h.

◆ stackingMode

QStackedLayout::StackingMode QStackedLayout::stackingMode

private

determines the way visibility of child widgets are handled.

Since: 4.4

The default value is StackOne. Setting the property to StackAll allows you to make use of the layout for overlay widgets that do additional drawing on top of other widgets, for example, graphical editors.

Definition at line 61 of file qstackedlayout.h.

The documentation for this class was generated from the following files:

/src/gui/kernel/qstackedlayout.h
/src/gui/kernel/qstackedlayout.cpp

Public Types

Public Slots

Signals

Public Functions

Properties

Additional Inherited Members

Detailed Description

Enumerations

◆ StackingMode

Constructors and Destructors

◆ QStackedLayout() [1/3]

◆ QStackedLayout() [2/3]

◆ QStackedLayout() [3/3]

◆ ~QStackedLayout()

Functions

◆ addItem()

◆ addWidget()

◆ count()

◆ currentChanged

◆ currentIndex()

◆ currentWidget()

◆ insertWidget()

◆ itemAt()

◆ minimumSize()

◆ setCurrentIndex

◆ setCurrentWidget

◆ setGeometry()

◆ setStackingMode()

◆ sizeHint()

◆ stackingMode()

◆ takeAt()

◆ widget()

◆ widgetRemoved

Properties

◆ currentIndex

◆ stackingMode