The QComboBox widget combines a button with a dropdown list. More...

#include <qcombobox.h>

Inheritance diagram for QComboBox:

Collaboration diagram for QComboBox:

Public Types
enum	InsertPolicy { NoInsert , InsertAtTop , InsertAtCurrent , InsertAtBottom , InsertAfterCurrent , InsertBeforeCurrent , InsertAlphabetically }
	This enum specifies what the QComboBox should do when a new string is entered by the user. More...

enum	SizeAdjustPolicy { AdjustToContents , AdjustToContentsOnFirstShow , AdjustToMinimumContentsLengthWithIcon }
	This enum specifies how the size hint of the QComboBox should adjust when new content is added or content changes. More...

enum class	LabelDrawingMode { UseStyle , UseDelegate }

Public Types inherited from QWidget
enum	RenderFlag { DrawWindowBackground = 0x1 , DrawChildren = 0x2 , IgnoreMask = 0x4 }
	This enum describes how to render the widget when calling QWidget::render(). More...

Public Types inherited from QPaintDevice
enum	PaintDeviceMetric { PdmWidth = 1 , PdmHeight , PdmWidthMM , PdmHeightMM , PdmNumColors , PdmDepth , PdmDpiX , PdmDpiY , PdmPhysicalDpiX , PdmPhysicalDpiY , PdmDevicePixelRatio , PdmDevicePixelRatioScaled , PdmDevicePixelRatioF_EncodedA , PdmDevicePixelRatioF_EncodedB }

Public Slots
void	clear ()
	Clears the combobox, removing all items.

void	clearEditText ()
	Clears the contents of the line edit used for editing in the combobox.

void	setEditText (const QString &text)
	Sets the text in the combobox's text edit.

void	setCurrentIndex (int index)

void	setCurrentText (const QString &text)

Public Slots inherited from QWidget
void	setEnabled (bool)

void	setDisabled (bool)
	Disables widget input events if disable is true; otherwise enables input events.

void	setWindowModified (bool)

void	setWindowTitle (const QString &)

void	setStyleSheet (const QString &styleSheet)

void	setFocus ()
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the \l{isActiveWindow()}{active window}.

void	update ()
	Updates the widget unless updates are disabled or the widget is hidden.

void	repaint ()
	Repaints the widget directly by calling paintEvent() immediately, unless updates are disabled or the widget is hidden.

virtual void	setVisible (bool visible)

void	setHidden (bool hidden)
	Convenience function, equivalent to setVisible(!hidden).

void	show ()
	Shows the widget and its child widgets.

void	hide ()
	Hides the widget.

void	showMinimized ()
	Shows the widget minimized, as an icon.

void	showMaximized ()
	Shows the widget maximized.

void	showFullScreen ()
	Shows the widget in full-screen mode.

void	showNormal ()
	Restores the widget after it has been maximized or minimized.

bool	close ()
	Closes this widget.

void	raise ()
	Raises this widget to the top of the parent widget's stack.

void	lower ()
	Lowers the widget to the bottom of the parent widget's stack.

Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Signals
void	editTextChanged (const QString &)
	This signal is emitted when the text in the combobox's line edit widget is changed.

void	activated (int index)
	This signal is sent when the user chooses an item in the combobox.

void	textActivated (const QString &)

void	highlighted (int index)
	This signal is sent when an item in the combobox popup list is highlighted by the user.

void	textHighlighted (const QString &)

void	currentIndexChanged (int index)

void	currentTextChanged (const QString &)

Signals inherited from QWidget
void	windowTitleChanged (const QString &title)
	This signal is emitted when the window's title has changed, with the new title as an argument.

void	windowIconChanged (const QIcon &icon)
	This signal is emitted when the window's icon has changed, with the new icon as an argument.

void	windowIconTextChanged (const QString &iconText)
	This signal is emitted when the window's icon text has changed, with the new iconText as an argument.

void	customContextMenuRequested (const QPoint &pos)
	This signal is emitted when the widget's \l contextMenuPolicy is Qt::CustomContextMenu, and the user has requested a context menu on the widget.

Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.

void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Public Member Functions
	QComboBox (QWidget *parent=nullptr)
	Constructs a combobox with the given parent, using the default model QStandardItemModel.

	~QComboBox ()
	Destroys the combobox.

int	maxVisibleItems () const

void	setMaxVisibleItems (int maxItems)

int	count () const

void	setMaxCount (int max)

int	maxCount () const

bool	duplicatesEnabled () const

void	setDuplicatesEnabled (bool enable)

void	setFrame (bool)

bool	hasFrame () const

int	findText (const QString &text, Qt::MatchFlags flags=static_cast< Qt::MatchFlags >(Qt::MatchExactly\|Qt::MatchCaseSensitive)) const
	Returns the index of the item containing the given text; otherwise returns -1.

int	findData (const QVariant &data, int role=Qt::UserRole, Qt::MatchFlags flags=static_cast< Qt::MatchFlags >(Qt::MatchExactly\|Qt::MatchCaseSensitive)) const
	Returns the index of the item containing the given data for the given role; otherwise returns -1.

InsertPolicy	insertPolicy () const

void	setInsertPolicy (InsertPolicy policy)

SizeAdjustPolicy	sizeAdjustPolicy () const

void	setSizeAdjustPolicy (SizeAdjustPolicy policy)

int	minimumContentsLength () const

void	setMinimumContentsLength (int characters)

QSize	iconSize () const

void	setIconSize (const QSize &size)

void	setPlaceholderText (const QString &placeholderText)

QString	placeholderText () const

bool	isEditable () const

void	setEditable (bool editable)

void	setLineEdit (QLineEdit *edit)
	Sets the line edit to use instead of the current line edit widget.

QLineEdit *	lineEdit () const
	Returns the line edit used to edit items in the combobox, or \nullptr if there is no line edit.

void	setValidator (const QValidator *v)
	Sets the validator to use instead of the current validator.

const QValidator *	validator () const
	Returns the validator that is used to constrain text input for the combobox.

QAbstractItemDelegate *	itemDelegate () const
	Returns the item delegate used by the popup list view.

void	setItemDelegate (QAbstractItemDelegate *delegate)
	Sets the item delegate for the popup list view.

QAbstractItemModel *	model () const
	Returns the model used by the combobox.

virtual void	setModel (QAbstractItemModel *model)
	Sets the model to be model.

QModelIndex	rootModelIndex () const
	Returns the root model item index for the items in the combobox.

void	setRootModelIndex (const QModelIndex &index)
	Sets the root model item index for the items in the combobox.

int	modelColumn () const

void	setModelColumn (int visibleColumn)

LabelDrawingMode	labelDrawingMode () const

void	setLabelDrawingMode (LabelDrawingMode labelDrawing)

int	currentIndex () const

QString	currentText () const

QVariant	currentData (int role=Qt::UserRole) const

QString	itemText (int index) const
	Returns the text for the given index in the combobox.

QIcon	itemIcon (int index) const
	Returns the icon for the given index in the combobox.

QVariant	itemData (int index, int role=Qt::UserRole) const
	Returns the data for the given role in the given index in the combobox, or an invalid QVariant if there is no data for this role.

void	addItem (const QString &text, const QVariant &userData=QVariant())
	Adds an item to the combobox with the given text, and containing the specified userData (stored in the Qt::UserRole).

void	addItem (const QIcon &icon, const QString &text, const QVariant &userData=QVariant())
	Adds an item to the combobox with the given icon and text, and containing the specified userData (stored in the Qt::UserRole).

void	addItems (const QStringList &texts)
	Adds each of the strings in the given texts to the combobox.

void	insertItem (int index, const QString &text, const QVariant &userData=QVariant())
	Inserts the text and userData (stored in the Qt::UserRole) into the combobox at the given index.

void	insertItem (int index, const QIcon &icon, const QString &text, const QVariant &userData=QVariant())
	Inserts the icon, text and userData (stored in the Qt::UserRole) into the combobox at the given index.

void	insertItems (int index, const QStringList &texts)
	Inserts the strings from the list into the combobox as separate items, starting at the index specified.

void	insertSeparator (int index)

void	removeItem (int index)
	Removes the item at the given index from the combobox.

void	setItemText (int index, const QString &text)
	Sets the text for the item on the given index in the combobox.

void	setItemIcon (int index, const QIcon &icon)
	Sets the icon for the item on the given index in the combobox.

void	setItemData (int index, const QVariant &value, int role=Qt::UserRole)
	Sets the data role for the item on the given index in the combobox to the specified value.

QAbstractItemView *	view () const
	Returns the list view used for the combobox popup.

void	setView (QAbstractItemView *itemView)
	Sets the view to be used in the combobox popup to the given itemView.

QSize	sizeHint () const override
	\reimp

QSize	minimumSizeHint () const override
	\reimp

virtual void	showPopup ()
	Displays the list of items in the combobox.

virtual void	hidePopup ()
	Hides the list of items in the combobox if it is currently visible and resets the internal state, so that if the custom pop-up was shown inside the reimplemented showPopup(), then you also need to reimplement the hidePopup() function to hide your custom pop-up and call the base class implementation to reset the internal state whenever your custom pop-up widget is hidden.

bool	event (QEvent *event) override
	\reimp

QVariant	inputMethodQuery (Qt::InputMethodQuery) const override
	\reimp

Q_INVOKABLE QVariant	inputMethodQuery (Qt::InputMethodQuery query, const QVariant &argument) const

Public Member Functions inherited from QWidget
	QWidget (QWidget *parent=nullptr, Qt::WindowFlags f=Qt::WindowFlags())
	Constructs a widget which is a child of parent, with widget flags set to f.

	~QWidget ()
	Destroys the widget.

int	devType () const override

WId	winId () const
	Returns the window system identifier of the widget.

void	createWinId ()

WId	internalWinId () const

WId	effectiveWinId () const

QStyle *	style () const

void	setStyle (QStyle *)
	Sets the widget's GUI style to style.

bool	isWindow () const
	Returns `true` if the widget is an independent window, otherwise returns `false`.

bool	isModal () const

Qt::WindowModality	windowModality () const

void	setWindowModality (Qt::WindowModality windowModality)

bool	isEnabled () const

bool	isEnabledTo (const QWidget *) const
	Returns `true` if this widget would become enabled if ancestor is enabled; otherwise returns `false`.

QRect	frameGeometry () const

const QRect &	geometry () const

QRect	normalGeometry () const

int	x () const

int	y () const

QPoint	pos () const

QSize	frameSize () const

QSize	size () const

int	width () const

int	height () const

QRect	rect () const

QRect	childrenRect () const

QRegion	childrenRegion () const

QSize	minimumSize () const

QSize	maximumSize () const

int	minimumWidth () const

int	minimumHeight () const

int	maximumWidth () const

int	maximumHeight () const

void	setMinimumSize (const QSize &)

void	setMinimumSize (int minw, int minh)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function corresponds to setMinimumSize(QSize(minw, minh)).

void	setMaximumSize (const QSize &)

void	setMaximumSize (int maxw, int maxh)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function corresponds to setMaximumSize(QSize(maxw, maxh)).

void	setMinimumWidth (int minw)

void	setMinimumHeight (int minh)

void	setMaximumWidth (int maxw)

void	setMaximumHeight (int maxh)

QSize	sizeIncrement () const

void	setSizeIncrement (const QSize &)

void	setSizeIncrement (int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the x (width) size increment to w and the y (height) size increment to h.

QSize	baseSize () const

void	setBaseSize (const QSize &)

void	setBaseSize (int basew, int baseh)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to setBaseSize(QSize(basew, baseh)).

void	setFixedSize (const QSize &)
	Sets both the minimum and maximum sizes of the widget to s, thereby preventing it from ever growing or shrinking.

void	setFixedSize (int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the width of the widget to w and the height to h.

void	setFixedWidth (int w)
	Sets both the minimum and maximum width of the widget to w without changing the heights.

void	setFixedHeight (int h)
	Sets both the minimum and maximum heights of the widget to h without changing the widths.

QPointF	mapToGlobal (const QPointF &) const
	Translates the widget coordinate pos to global screen coordinates.

QPoint	mapToGlobal (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapFromGlobal (const QPointF &) const
	Translates the global screen coordinate pos to widget coordinates.

QPoint	mapFromGlobal (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapToParent (const QPointF &) const
	Translates the widget coordinate pos to a coordinate in the parent widget.

QPoint	mapToParent (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapFromParent (const QPointF &) const
	Translates the parent widget coordinate pos to widget coordinates.

QPoint	mapFromParent (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapTo (const QWidget *, const QPointF &) const
	Translates the widget coordinate pos to the coordinate system of parent.

QPoint	mapTo (const QWidget *, const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapFrom (const QWidget *, const QPointF &) const
	Translates the widget coordinate pos from the coordinate system of parent to this widget's coordinate system.

QPoint	mapFrom (const QWidget *, const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QWidget *	window () const
	Returns the window for this widget, i.e.

QWidget *	nativeParentWidget () const

QWidget *	topLevelWidget () const

const QPalette &	palette () const

void	setPalette (const QPalette &)

void	setBackgroundRole (QPalette::ColorRole)
	Sets the background role of the widget to role.

QPalette::ColorRole	backgroundRole () const
	Returns the background role of the widget.

void	setForegroundRole (QPalette::ColorRole)
	Sets the foreground role of the widget to role.

QPalette::ColorRole	foregroundRole () const
	Returns the foreground role.

const QFont &	font () const

void	setFont (const QFont &)

QFontMetrics	fontMetrics () const
	Returns the font metrics for the widget's current font.

QFontInfo	fontInfo () const
	Returns the font info for the widget's current font.

QCursor	cursor () const

void	setCursor (const QCursor &)

void	unsetCursor ()

void	setMouseTracking (bool enable)

bool	hasMouseTracking () const

bool	underMouse () const
	Returns `true` if the widget is under the mouse cursor; otherwise returns `false`.

void	setTabletTracking (bool enable)

bool	hasTabletTracking () const

void	setMask (const QBitmap &)
	Causes only the pixels of the widget for which bitmap has a corresponding 1 bit to be visible.

void	setMask (const QRegion &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Causes only the parts of the widget which overlap region to be visible.

QRegion	mask () const
	Returns the mask currently set on a widget.

void	clearMask ()
	Removes any mask set by setMask().

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))
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Renders the widget into the painter's QPainter::device().

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

void	grabGesture (Qt::GestureType type, Qt::GestureFlags flags=Qt::GestureFlags())
	Subscribes the widget to a given gesture with specific flags.

void	ungrabGesture (Qt::GestureType type)
	Unsubscribes the widget from a given gesture type.

QString	styleSheet () const

QString	windowTitle () const

void	setWindowIcon (const QIcon &icon)

QIcon	windowIcon () const

void	setWindowIconText (const QString &)

QString	windowIconText () const

void	setWindowRole (const QString &)
	Sets the window's role to role.

QString	windowRole () const
	Returns the window's role, or an empty string.

void	setWindowFilePath (const QString &filePath)

QString	windowFilePath () const

void	setWindowOpacity (qreal level)

qreal	windowOpacity () const

bool	isWindowModified () const

void	setLayoutDirection (Qt::LayoutDirection direction)

Qt::LayoutDirection	layoutDirection () const

void	unsetLayoutDirection ()

void	setLocale (const QLocale &locale)

QLocale	locale () const

void	unsetLocale ()

bool	isRightToLeft () const

bool	isLeftToRight () const

bool	isActiveWindow () const

void	activateWindow ()
	Sets the top-level widget containing this widget to be the active window.

void	clearFocus ()
	Takes keyboard input focus from the widget.

void	setFocus (Qt::FocusReason reason)
	Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the \l{isActiveWindow()}{active window}.

Qt::FocusPolicy	focusPolicy () const

void	setFocusPolicy (Qt::FocusPolicy policy)

bool	hasFocus () const

void	setFocusProxy (QWidget *)
	Sets the widget's focus proxy to widget w.

QWidget *	focusProxy () const
	Returns the focus proxy, or \nullptr if there is no focus proxy.

Qt::ContextMenuPolicy	contextMenuPolicy () const

void	setContextMenuPolicy (Qt::ContextMenuPolicy policy)

void	grabMouse ()
	Grabs the mouse input.

void	grabMouse (const QCursor &)

void	releaseMouse ()
	Releases the mouse grab.

void	grabKeyboard ()
	Grabs the keyboard input.

void	releaseKeyboard ()
	Releases the keyboard grab.

int	grabShortcut (const QKeySequence &key, Qt::ShortcutContext context=Qt::WindowShortcut)
	Adds a shortcut to Qt's shortcut system that watches for the given key sequence in the given context.

void	releaseShortcut (int id)
	Removes the shortcut with the given id from Qt's shortcut system.

void	setShortcutEnabled (int id, bool enable=true)
	If enable is true, the shortcut with the given id is enabled; otherwise the shortcut is disabled.

void	setShortcutAutoRepeat (int id, bool enable=true)

bool	updatesEnabled () const

void	setUpdatesEnabled (bool enable)

void	update (int x, int y, int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version updates a rectangle (x, y, w, h) inside the widget.

void	update (const QRect &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version updates a rectangle rect inside the widget.

void	update (const QRegion &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a region rgn inside the widget.

void	repaint (int x, int y, int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a rectangle (x, y, w, h) inside the widget.

void	repaint (const QRect &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a rectangle rect inside the widget.

void	repaint (const QRegion &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a region rgn inside the widget.

void	stackUnder (QWidget *)
	Places the widget under w in the parent widget's stack.

void	move (int x, int y)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to move(QPoint(x, y)).

void	move (const QPoint &)

void	resize (int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to resize(QSize(w, h)).

void	resize (const QSize &)

void	setGeometry (int x, int y, int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to setGeometry(QRect(x, y, w, h)).

void	setGeometry (const QRect &)

QByteArray	saveGeometry () const

bool	restoreGeometry (const QByteArray &geometry)

void	adjustSize ()
	Adjusts the size of the widget to fit its contents.

bool	isVisible () const

bool	isVisibleTo (const QWidget *) const
	Returns `true` if this widget would become visible if ancestor is shown; otherwise returns `false`.

bool	isHidden () const
	Returns `true` if the widget is hidden, otherwise returns `false`.

bool	isMinimized () const

bool	isMaximized () const

bool	isFullScreen () const

Qt::WindowStates	windowState () const
	Returns the current window state.

void	setWindowState (Qt::WindowStates state)
	Sets the window state to windowState.

void	overrideWindowState (Qt::WindowStates state)

QSizePolicy	sizePolicy () const

void	setSizePolicy (QSizePolicy)

void	setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the size policy of the widget to horizontal and vertical, with standard stretch and no height-for-width.

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

virtual bool	hasHeightForWidth () const

QRegion	visibleRegion () const
	Returns the unobscured region where paint events can occur.

void	setContentsMargins (int left, int top, int right, int bottom)
	Sets the margins around the contents of the widget to have the sizes left, top, right, and bottom.

void	setContentsMargins (const QMargins &margins)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QMargins	contentsMargins () const
	The contentsMargins function returns the widget's contents margins.

QRect	contentsRect () const
	Returns the area inside the widget's margins.

QLayout *	layout () const
	Returns the layout manager that is installed on this widget, or \nullptr if no layout manager is installed.

void	setLayout (QLayout *)
	Sets the layout manager for this widget to layout.

void	updateGeometry ()
	Notifies the layout system that this widget has changed and may need to change geometry.

void	setParent (QWidget *parent)
	Sets the parent of the widget to parent, and resets the window flags.

void	setParent (QWidget *parent, Qt::WindowFlags f)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function also takes widget flags, f as an argument.

void	scroll (int dx, int dy)
	Scrolls the widget including its children dx pixels to the right and dy downward.

void	scroll (int dx, int dy, const QRect &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version only scrolls r and does not move the children of the widget.

QWidget *	focusWidget () const
	Returns the last child of this widget that setFocus had been called on.

QWidget *	nextInFocusChain () const
	Returns the next widget in this widget's focus chain.

QWidget *	previousInFocusChain () const
	The previousInFocusChain function returns the previous widget in this widget's focus chain.

bool	acceptDrops () const

void	setAcceptDrops (bool on)

void	addAction (QAction *action)
	Appends the action action to this widget's list of actions.

void	addActions (const QList< QAction * > &actions)
	Appends the actions actions to this widget's list of actions.

void	insertActions (QAction before, const QList< QAction > &actions)
	Inserts the actions actions to this widget's list of actions, before the action before.

void	insertAction (QAction before, QAction action)
	Inserts the action action to this widget's list of actions, before the action before.

void	removeAction (QAction *action)
	Removes the action action from this widget's list of actions.

QList< QAction * >	actions () const
	Returns the (possibly empty) list of this widget's actions.

QAction *	addAction (const QString &text)

QAction *	addAction (const QIcon &icon, const QString &text)

QAction *	addAction (const QString &text, const QObject receiver, const char member, Qt::ConnectionType type=Qt::AutoConnection)

QAction *	addAction (const QIcon &icon, const QString &text, const QObject receiver, const char member, Qt::ConnectionType type=Qt::AutoConnection)

template<typename... Args, typename = compatible_action_slot_args<Args...>>
QAction *	addAction (const QString &text, Args &&...args)

template<typename... Args, typename = compatible_action_slot_args<Args...>>
QAction *	addAction (const QIcon &icon, const QString &text, Args &&...args)

QWidget *	parentWidget () const
	Returns the parent of this widget, or \nullptr if it does not have any parent widget.

void	setWindowFlags (Qt::WindowFlags type)

Qt::WindowFlags	windowFlags () const
	Window flags are a combination of a type (e.g.

void	setWindowFlag (Qt::WindowType, bool on=true)

void	overrideWindowFlags (Qt::WindowFlags type)
	Sets the window flags for the widget to flags, without telling the window system.

Qt::WindowType	windowType () const
	Returns the window type of this widget.

QWidget *	childAt (int x, int y) const
	Returns the visible child widget at the position ({x}, {y}) in the widget's coordinate system.

QWidget *	childAt (const QPoint &p) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns the visible child widget at point p in the widget's own coordinate system.

QWidget *	childAt (const QPointF &p) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

void	setAttribute (Qt::WidgetAttribute, bool on=true)
	Sets the attribute attribute on this widget if on is true; otherwise clears the attribute.

bool	testAttribute (Qt::WidgetAttribute) const
	Returns `true` if attribute attribute is set on this widget; otherwise returns `false`.

QPaintEngine *	paintEngine () const override
	Returns the widget's paint engine.

void	ensurePolished () const
	Ensures that the widget and its children have been polished by QStyle (i.e., have a proper font and palette).

bool	isAncestorOf (const QWidget *child) const
	Returns `true` if this widget is a parent, (or grandparent and so on to any level), of the given child, and both widgets are within the same window; otherwise returns `false`.

bool	autoFillBackground () const

void	setAutoFillBackground (bool enabled)

QBackingStore *	backingStore () const

QWindow *	windowHandle () const
	If this is a native widget, return the associated QWindow.

QScreen *	screen () const
	Returns the screen the widget is on.

void	setScreen (QScreen *)
	Sets the screen on which the widget should be shown to screen.

Qt::InputMethodHints	inputMethodHints () const

void	setInputMethodHints (Qt::InputMethodHints hints)

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.

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

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

QString	objectName () const

Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.

void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QBindable< QString >	bindableObjectName ()

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

bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.

bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.

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

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

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

bool	moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
	Changes the thread affinity for this object and its children and returns `true` on success.

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.

int	startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

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

void	killTimer (Qt::TimerId id)

template<typename T >
T	findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.

template<typename T >
QList< T >	findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) 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.

template<typename T >
T	findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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

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

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

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

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

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

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

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

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

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

bool	setProperty (const char *name, QVariant &&value)

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

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

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

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`.

Public Member Functions inherited from QPaintDevice
virtual	~QPaintDevice ()

bool	paintingActive () const

int	width () const

int	height () const

int	widthMM () const

int	heightMM () const

int	logicalDpiX () const

int	logicalDpiY () const

int	physicalDpiX () const

int	physicalDpiY () const

qreal	devicePixelRatio () const

qreal	devicePixelRatioF () const

int	colorCount () const

int	depth () const

Protected Member Functions
void	focusInEvent (QFocusEvent *e) override
	\reimp

void	focusOutEvent (QFocusEvent *e) override
	\reimp

void	changeEvent (QEvent *e) override
	\reimp

void	resizeEvent (QResizeEvent *e) override
	\reimp

void	paintEvent (QPaintEvent *e) override
	\reimp

void	showEvent (QShowEvent *e) override
	\reimp

void	hideEvent (QHideEvent *e) override
	\reimp

void	mousePressEvent (QMouseEvent *e) override
	\reimp

void	mouseReleaseEvent (QMouseEvent *e) override
	\reimp

void	keyPressEvent (QKeyEvent *e) override
	\reimp

void	keyReleaseEvent (QKeyEvent *e) override
	\reimp

void	contextMenuEvent (QContextMenuEvent *e) override
	\reimp

void	inputMethodEvent (QInputMethodEvent *) override
	\reimp

virtual void	initStyleOption (QStyleOptionComboBox *option) const
	Initialize option with the values from this QComboBox.

	QComboBox (QComboBoxPrivate &, QWidget *)

Protected Member Functions inherited from QWidget
bool	event (QEvent *event) override
	This is the main event handler; it handles event event.

virtual void	mouseDoubleClickEvent (QMouseEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive mouse double click events for the widget.

virtual void	mouseMoveEvent (QMouseEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive mouse move events for the widget.

virtual void	enterEvent (QEnterEvent *event)
	This event handler can be reimplemented in a subclass to receive widget enter events which are passed in the event parameter.

virtual void	leaveEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive widget leave events which are passed in the event parameter.

virtual void	moveEvent (QMoveEvent *event)
	This event handler can be reimplemented in a subclass to receive widget move events which are passed in the event parameter.

virtual void	closeEvent (QCloseEvent *event)
	This event handler is called with the given event when Qt receives a window close request for a top-level widget from the window system.

virtual void	actionEvent (QActionEvent *event)
	This event handler is called with the given event whenever the widget's actions are changed.

virtual bool	nativeEvent (const QByteArray &eventType, void message, qintptr result)
	This special event handler can be reimplemented in a subclass to receive native platform events identified by eventType which are passed in the message parameter.

int	metric (PaintDeviceMetric) const override
	Internal implementation of the virtual QPaintDevice::metric() function.

void	initPainter (QPainter *painter) const override
	Initializes the painter pen, background and font to the same as the given widget's.

QPaintDevice *	redirected (QPoint *offset) const override

QPainter *	sharedPainter () const override

void	create (WId=0, bool initializeWindow=true, bool destroyOldWindow=true)
	Creates a new widget window.

void	destroy (bool destroyWindow=true, bool destroySubWindows=true)
	Frees up window system resources.

virtual bool	focusNextPrevChild (bool next)
	Finds a new widget to give the keyboard focus to, as appropriate for Tab and Shift+Tab, and returns `true` if it can find a new widget, or false if it can't.

bool	focusNextChild ()
	Finds a new widget to give the keyboard focus to, as appropriate for \uicontrol Tab, and returns `true` if it can find a new widget, or false if it can't.

bool	focusPreviousChild ()
	Finds a new widget to give the keyboard focus to, as appropriate for \uicontrol Shift+Tab, and returns `true` if it can find a new widget, or false if it can't.

	QWidget (QWidgetPrivate &d, QWidget *parent, Qt::WindowFlags f)

Protected Member Functions inherited from QObject
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 \nullptr.

int	senderSignalIndex () const

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

bool	isSignalConnected (const QMetaMethod &signal) const

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

virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.

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

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

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

Protected Member Functions inherited from QPaintDevice
	QPaintDevice () noexcept

double	getDecodedMetricF (PaintDeviceMetric metricA, PaintDeviceMetric metricB) const

Properties
bool	editable
	whether the combo box can be edited by the user.

int	count
	the number of items in the combobox.

QString	currentText
	the current text

int	currentIndex
	the index of the current item in the combobox.

QVariant	currentData
	the data for the current item

int	maxVisibleItems
	the maximum allowed size on screen of the combo box, measured in items

int	maxCount
	the maximum number of items allowed in the combobox.

InsertPolicy	insertPolicy
	the policy used to determine where user-inserted items should appear in the combobox.

SizeAdjustPolicy	sizeAdjustPolicy
	the policy describing how the size of the combobox changes when the content changes.

int	minimumContentsLength
	the minimum number of characters that should fit into the combobox.

QSize	iconSize
	the size of the icons shown in the combobox.

QString	placeholderText
	Sets a placeholderText text shown when no valid index is set.

bool	duplicatesEnabled
	whether the user can enter duplicate items into the combobox.

bool	frame
	whether the combo box draws itself with a frame.

int	modelColumn
	the column in the model that is visible.

LabelDrawingMode	labelDrawingMode
	the mode used by the combobox to draw its label.

Properties inherited from QWidget
bool	modal
	whether the widget is a modal widget

Qt::WindowModality	windowModality
	which windows are blocked by the modal widget

bool	enabled
	whether the widget is enabled

QRect	geometry
	the geometry of the widget relative to its parent and excluding the window frame

QRect	frameGeometry
	geometry of the widget relative to its parent including any window frame

QRect	normalGeometry
	the geometry of the widget as it will appear when shown as a normal (not maximized or full screen) top-level widget

int	x
	the x coordinate of the widget relative to its parent including any window frame

int	y
	the y coordinate of the widget relative to its parent and including any window frame

QPoint	pos
	the position of the widget within its parent widget

QSize	frameSize
	the size of the widget including any window frame

QSize	size
	the size of the widget excluding any window frame

int	width
	the width of the widget excluding any window frame

int	height
	the height of the widget excluding any window frame

QRect	rect
	the internal geometry of the widget excluding any window frame

QRect	childrenRect
	the bounding rectangle of the widget's children

QRegion	childrenRegion
	the combined region occupied by the widget's children

QSizePolicy	sizePolicy
	the default layout behavior of the widget

QSize	minimumSize
	the widget's minimum size

QSize	maximumSize
	the widget's maximum size in pixels

int	minimumWidth
	the widget's minimum width in pixels

int	minimumHeight
	the widget's minimum height in pixels

int	maximumWidth
	the widget's maximum width in pixels

int	maximumHeight
	the widget's maximum height in pixels

QSize	sizeIncrement
	the size increment of the widget

QSize	baseSize
	the base size of the widget

QPalette	palette
	the widget's palette

QFont	font
	the font currently set for the widget

QCursor	cursor
	the cursor shape for this widget

bool	mouseTracking
	whether mouse tracking is enabled for the widget

bool	tabletTracking
	whether tablet tracking is enabled for the widget

bool	isActiveWindow
	whether this widget's window is the active window

Qt::FocusPolicy	focusPolicy
	the way the widget accepts keyboard focus

bool	focus
	whether this widget (or its focus proxy) has the keyboard input focus

Qt::ContextMenuPolicy	contextMenuPolicy
	how the widget shows a context menu

bool	updatesEnabled
	whether updates are enabled

bool	visible
	whether the widget is visible

bool	minimized
	whether this widget is minimized (iconified)

bool	maximized
	whether this widget is maximized

bool	fullScreen
	whether the widget is shown in full screen mode

QSize	sizeHint
	the recommended size for the widget

QSize	minimumSizeHint
	the recommended minimum size for the widget

bool	acceptDrops
	whether drop events are enabled for this widget

QString	windowTitle
	the window title (caption)

QIcon	windowIcon
	the widget's icon

QString	windowIconText
	the text to be displayed on the icon of a minimized window

double	windowOpacity
	The level of opacity for the window.

bool	windowModified
	whether the document shown in the window has unsaved changes

Qt::LayoutDirection	layoutDirection
	the layout direction for this widget.

bool	autoFillBackground
	whether the widget background is filled automatically

QString	styleSheet
	the widget's style sheet

QLocale	locale
	the widget's locale

QString	windowFilePath
	the file path associated with a widget

Qt::InputMethodHints	inputMethodHints
	What input method specific hints the widget has.

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Static Public Member Functions inherited from QWidget
static void	setTabOrder (QWidget , QWidget )
	Puts the second widget after the first widget in the focus order.

static void	setTabOrder (std::initializer_list< QWidget * > widgets)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

static QWidget *	mouseGrabber ()
	Returns the widget that is currently grabbing the mouse input.

static QWidget *	keyboardGrabber ()
	Returns the widget that is currently grabbing the keyboard input.

static QWidget *	find (WId)
	Returns a pointer to the widget with window identifier/handle id.

static QWidget *	createWindowContainer (QWindow window, QWidget parent=nullptr, Qt::WindowFlags flags=Qt::WindowFlags())
	Creates a QWidget that makes it possible to embed window into a QWidget-based application.

Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe

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

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe

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

static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.

template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)

template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)

Static Public Member Functions inherited from QPaintDevice
static qreal	devicePixelRatioFScale ()

static int	encodeMetricF (PaintDeviceMetric metric, double value)

Protected Slots inherited from QWidget
void	updateMicroFocus (Qt::InputMethodQuery query=Qt::ImQueryAll)
	Updates the widget's micro focus and informs input methods that the state specified by query has changed.

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Protected Attributes inherited from QPaintDevice
ushort	painters

Related Symbols inherited from QWidget
	setupUi (QWidget *widget)
	\macro QWIDGETSIZE_MAX

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

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

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

The QComboBox widget combines a button with a dropdown list.

\inmodule QtWidgets

\table \row

\inlineimage collapsed_combobox.png \caption Collapsed QCombobox
\inlineimage expanded_combobox.png \caption Expanded QCombobox \endtable

Definition at line 23 of file qcombobox.h.

Member Enumeration Documentation

◆ InsertPolicy

enum QComboBox::InsertPolicy

This enum specifies what the QComboBox should do when a new string is entered by the user.

\value NoInsert The string will not be inserted into the combobox. \value InsertAtTop The string will be inserted as the first item in the combobox. \value InsertAtCurrent The current item will be replaced by the string. \value InsertAtBottom The string will be inserted after the last item in the combobox. \value InsertAfterCurrent The string is inserted after the current item in the combobox. \value InsertBeforeCurrent The string is inserted before the current item in the combobox. \value InsertAlphabetically The string is inserted in the alphabetic order in the combobox.

Enumerator
NoInsert
InsertAtTop
InsertAtCurrent
InsertAtBottom
InsertAfterCurrent
InsertBeforeCurrent
InsertAlphabetically

Definition at line 68 of file qcombobox.h.

◆ LabelDrawingMode

enum class QComboBox::LabelDrawingMode

strong

Since: 6.9

This enum specifies how the combobox draws its label.

\value UseStyle The combobox uses the \l{QStyle}{style} to draw its label. \value UseDelegate The combobox uses the \l{itemDelegate()}{item delegate} to draw the label. Set a suitable item delegate when using this mode.

See also: labelDrawingMode, {Books}{Books example}

Enumerator
UseStyle
UseDelegate

Definition at line 89 of file qcombobox.h.

◆ SizeAdjustPolicy

enum QComboBox::SizeAdjustPolicy

This enum specifies how the size hint of the QComboBox should adjust when new content is added or content changes.

\value AdjustToContents The combobox will always adjust to the contents \value AdjustToContentsOnFirstShow The combobox will adjust to its contents the first time it is shown. \value AdjustToMinimumContentsLengthWithIcon The combobox will adjust to \l minimumContentsLength plus space for an icon. For performance reasons use this policy on large models.

Enumerator
AdjustToContents
AdjustToContentsOnFirstShow
AdjustToMinimumContentsLengthWithIcon

Definition at line 82 of file qcombobox.h.

Constructor & Destructor Documentation

◆ QComboBox() [1/2]

QComboBox::QComboBox ( QWidget * parent = nullptr )

explicit

Constructs a combobox with the given parent, using the default model QStandardItemModel.

Definition at line 939 of file qcombobox.cpp.

◆ ~QComboBox()

QComboBox::~QComboBox ( )

Destroys the combobox.

Definition at line 1464 of file qcombobox.cpp.

◆ QComboBox() [2/2]

QComboBox::QComboBox	(	QComboBoxPrivate &	dd,
		QWidget *	parent )

protected

Definition at line 949 of file qcombobox.cpp.

Member Function Documentation

◆ activated

void QComboBox::activated ( int index )

signal

This signal is sent when the user chooses an item in the combobox.

The item's index is passed. Note that this signal is sent even when the choice is not changed. If you need to know when the choice actually changes, use signal currentIndexChanged() or currentTextChanged().

◆ addItem() [1/2]

void QComboBox::addItem	(	const QIcon &	icon,
		const QString &	text,
		const QVariant &	userData = QVariant() )

inline

Adds an item to the combobox with the given icon and text, and containing the specified userData (stored in the Qt::UserRole).

The item is appended to the list of existing items.

Definition at line 221 of file qcombobox.h.

◆ addItem() [2/2]

void QComboBox::addItem	(	const QString &	text,
		const QVariant &	userData = QVariant() )

inline

Adds an item to the combobox with the given text, and containing the specified userData (stored in the Qt::UserRole).

The item is appended to the list of existing items.

Definition at line 219 of file qcombobox.h.

◆ addItems()

void QComboBox::addItems ( const QStringList & texts )

inline

Adds each of the strings in the given texts to the combobox.

Each item is appended to the list of existing items in turn.

Definition at line 145 of file qcombobox.h.

◆ changeEvent()

void QComboBox::changeEvent ( QEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3017 of file qcombobox.cpp.

◆ clear

void QComboBox::clear ( )

slot

Clears the combobox, removing all items.

Note: If you have set an external model on the combobox this model will still be cleared when calling this function.

Definition at line 2951 of file qcombobox.cpp.

◆ clearEditText

void QComboBox::clearEditText ( )

slot

Clears the contents of the line edit used for editing in the combobox.

Definition at line 2964 of file qcombobox.cpp.

◆ contextMenuEvent()

void QComboBox::contextMenuEvent ( QContextMenuEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3443 of file qcombobox.cpp.

◆ count()

int QComboBox::count ( ) const

Definition at line 1511 of file qcombobox.cpp.

◆ currentData()

QVariant QComboBox::currentData ( int role = Qt::UserRole ) const

Definition at line 2259 of file qcombobox.cpp.

◆ currentIndex()

int QComboBox::currentIndex ( ) const

Definition at line 2160 of file qcombobox.cpp.

◆ currentIndexChanged

void QComboBox::currentIndexChanged ( int index )

signal

Since: 4.1

This signal is sent whenever the currentIndex in the combobox changes either through user interaction or programmatically. The item's index is passed or -1 if the combobox becomes empty or the currentIndex was reset.

◆ currentText()

QString QComboBox::currentText ( ) const

Definition at line 2241 of file qcombobox.cpp.

◆ currentTextChanged

void QComboBox::currentTextChanged ( const QString & text )

signal

Since: 5.0

This signal is emitted whenever currentText changes. The new value is passed as text.

Note: It is not emitted, if currentText remains the same, even if currentIndex changes.

◆ duplicatesEnabled()

bool QComboBox::duplicatesEnabled ( ) const

Definition at line 1559 of file qcombobox.cpp.

◆ editTextChanged

void QComboBox::editTextChanged ( const QString & text )

signal

This signal is emitted when the text in the combobox's line edit widget is changed.

The new text is specified by text.

◆ event()

bool QComboBox::event ( QEvent * event )

overridevirtual

\reimp

Reimplemented from QObject.

Reimplemented in QFontComboBox.

Definition at line 3138 of file qcombobox.cpp.

◆ findData()

int QComboBox::findData	(	const QVariant &	data,
		int	role = Qt::UserRole,
		Qt::MatchFlags	flags = static_cast<Qt::MatchFlags>(Qt::MatchExactly\|Qt::MatchCaseSensitive) ) const

Returns the index of the item containing the given data for the given role; otherwise returns -1.

The flags specify how the items in the combobox are searched.

Definition at line 1585 of file qcombobox.cpp.

◆ findText()

int QComboBox::findText	(	const QString &	text,
		Qt::MatchFlags	flags = static_cast<Qt::MatchFlags>(Qt::MatchExactly\|Qt::MatchCaseSensitive) ) const

inline

Returns the index of the item containing the given text; otherwise returns -1.

The flags specify how the items in the combobox are searched.

Definition at line 62 of file qcombobox.h.

◆ focusInEvent()

void QComboBox::focusInEvent ( QFocusEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 2992 of file qcombobox.cpp.

◆ focusOutEvent()

void QComboBox::focusOutEvent ( QFocusEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3008 of file qcombobox.cpp.

◆ hasFrame()

bool QComboBox::hasFrame ( ) const

Definition at line 3555 of file qcombobox.cpp.

◆ hideEvent()

void QComboBox::hideEvent ( QHideEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3130 of file qcombobox.cpp.

◆ hidePopup()

void QComboBox::hidePopup ( )

virtual

Hides the list of items in the combobox if it is currently visible and resets the internal state, so that if the custom pop-up was shown inside the reimplemented showPopup(), then you also need to reimplement the hidePopup() function to hide your custom pop-up and call the base class implementation to reset the internal state whenever your custom pop-up widget is hidden.

See also: showPopup()

Definition at line 2882 of file qcombobox.cpp.

◆ highlighted

void QComboBox::highlighted ( int index )

signal

This signal is sent when an item in the combobox popup list is highlighted by the user.

The item's index is passed.

◆ iconSize()

QSize QComboBox::iconSize ( ) const

Definition at line 1688 of file qcombobox.cpp.

◆ initStyleOption()

void QComboBox::initStyleOption ( QStyleOptionComboBox * option ) const

protectedvirtual

Initialize option with the values from this QComboBox.

This method is useful for subclasses when they need a QStyleOptionComboBox, but don't want to fill in all the information themselves.

See also: QStyleOption::initFrom()

Definition at line 1238 of file qcombobox.cpp.

◆ inputMethodEvent()

void QComboBox::inputMethodEvent ( QInputMethodEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3482 of file qcombobox.cpp.

◆ inputMethodQuery() [1/2]

QVariant QComboBox::inputMethodQuery	(	Qt::InputMethodQuery	query,
		const QVariant &	argument ) const

Definition at line 3508 of file qcombobox.cpp.

◆ inputMethodQuery() [2/2]

QVariant QComboBox::inputMethodQuery ( Qt::InputMethodQuery query ) const

overridevirtual

\reimp

Reimplemented from QWidget.

Definition at line 3498 of file qcombobox.cpp.

◆ insertItem() [1/2]

void QComboBox::insertItem	(	int	index,
		const QIcon &	icon,
		const QString &	text,
		const QVariant &	userData = QVariant() )

Inserts the icon, text and userData (stored in the Qt::UserRole) into the combobox at the given index.

If the index is equal to or higher than the total number of items, the new item is appended to the list of existing items. If the index is zero or negative, the new item is prepended to the list of existing items.

See also: insertItems()

Definition at line 2322 of file qcombobox.cpp.

◆ insertItem() [2/2]

void QComboBox::insertItem	(	int	index,
		const QString &	text,
		const QVariant &	userData = QVariant() )

inline

Inserts the text and userData (stored in the Qt::UserRole) into the combobox at the given index.

If the index is equal to or higher than the total number of items, the new item is appended to the list of existing items. If the index is zero or negative, the new item is prepended to the list of existing items.

See also: insertItems()

Definition at line 225 of file qcombobox.h.

◆ insertItems()

void QComboBox::insertItems	(	int	index,
		const QStringList &	list )

Inserts the strings from the list into the combobox as separate items, starting at the index specified.

If the index is equal to or higher than the total number of items, the new items are appended to the list of existing items. If the index is zero or negative, the new items are prepended to the list of existing items.

See also: insertItem()

Definition at line 2373 of file qcombobox.cpp.

◆ insertPolicy()

QComboBox::InsertPolicy QComboBox::insertPolicy ( ) const

Definition at line 1606 of file qcombobox.cpp.

◆ insertSeparator()

void QComboBox::insertSeparator ( int index )

Since: 4.4

Inserts a separator item into the combobox at the given index.

If the index is equal to or higher than the total number of items, the new item is appended to the list of existing items. If the index is zero or negative, the new item is prepended to the list of existing items.

See also: insertItem()

Definition at line 2422 of file qcombobox.cpp.

◆ isEditable()

bool QComboBox::isEditable ( ) const

Definition at line 1761 of file qcombobox.cpp.

◆ itemData()

QVariant QComboBox::itemData	(	int	index,
		int	role = Qt::UserRole ) const

Returns the data for the given role in the given index in the combobox, or an invalid QVariant if there is no data for this role.

Definition at line 2289 of file qcombobox.cpp.

◆ itemDelegate()

QAbstractItemDelegate * QComboBox::itemDelegate ( ) const

Returns the item delegate used by the popup list view.

See also: setItemDelegate()

Definition at line 2002 of file qcombobox.cpp.

◆ itemIcon()

QIcon QComboBox::itemIcon ( int index ) const

Returns the icon for the given index in the combobox.

Definition at line 2278 of file qcombobox.cpp.

◆ itemText()

QString QComboBox::itemText ( int index ) const

Returns the text for the given index in the combobox.

Definition at line 2268 of file qcombobox.cpp.

◆ keyPressEvent()

void QComboBox::keyPressEvent ( QKeyEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3242 of file qcombobox.cpp.

◆ keyReleaseEvent()

void QComboBox::keyReleaseEvent ( QKeyEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3396 of file qcombobox.cpp.

◆ labelDrawingMode()

QComboBox::LabelDrawingMode QComboBox::labelDrawingMode ( ) const

Definition at line 3629 of file qcombobox.cpp.

◆ lineEdit()

QLineEdit * QComboBox::lineEdit ( ) const

Returns the line edit used to edit items in the combobox, or \nullptr if there is no line edit.

Only editable combo boxes have a line edit.

Definition at line 1915 of file qcombobox.cpp.

◆ maxCount()

int QComboBox::maxCount ( ) const

Definition at line 1544 of file qcombobox.cpp.

◆ maxVisibleItems()

int QComboBox::maxVisibleItems ( ) const

Definition at line 1488 of file qcombobox.cpp.

◆ minimumContentsLength()

int QComboBox::minimumContentsLength ( ) const

Definition at line 1657 of file qcombobox.cpp.

◆ minimumSizeHint()

QSize QComboBox::minimumSizeHint ( ) const

overridevirtual

\reimp

Reimplemented from QWidget.

Definition at line 2521 of file qcombobox.cpp.

◆ model()

QAbstractItemModel * QComboBox::model ( ) const

Returns the model used by the combobox.

Definition at line 2035 of file qcombobox.cpp.

◆ modelColumn()

int QComboBox::modelColumn ( ) const

Definition at line 3583 of file qcombobox.cpp.

◆ mousePressEvent()

void QComboBox::mousePressEvent ( QMouseEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3176 of file qcombobox.cpp.

◆ mouseReleaseEvent()

void QComboBox::mouseReleaseEvent ( QMouseEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3231 of file qcombobox.cpp.

◆ paintEvent()

void QComboBox::paintEvent ( QPaintEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Reimplemented in QFileDialogComboBox.

Definition at line 3084 of file qcombobox.cpp.

◆ placeholderText()

QString QComboBox::placeholderText ( ) const

Definition at line 1743 of file qcombobox.cpp.

◆ removeItem()

void QComboBox::removeItem ( int index )

Removes the item at the given index from the combobox.

This will update the current index if the index is removed.

This function does nothing if index is out of range.

Definition at line 2439 of file qcombobox.cpp.

◆ resizeEvent()

void QComboBox::resizeEvent ( QResizeEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3075 of file qcombobox.cpp.

◆ rootModelIndex()

QModelIndex QComboBox::rootModelIndex ( ) const

Returns the root model item index for the items in the combobox.

See also: setRootModelIndex()

Definition at line 2130 of file qcombobox.cpp.

◆ setCurrentIndex

void QComboBox::setCurrentIndex ( int index )

slot

Definition at line 2166 of file qcombobox.cpp.

◆ setCurrentText

void QComboBox::setCurrentText ( const QString & text )

slot

Definition at line 2173 of file qcombobox.cpp.

◆ setDuplicatesEnabled()

void QComboBox::setDuplicatesEnabled ( bool enable )

Definition at line 1565 of file qcombobox.cpp.

◆ setEditable()

void QComboBox::setEditable ( bool editable )

Definition at line 1799 of file qcombobox.cpp.

◆ setEditText

void QComboBox::setEditText ( const QString & text )

slot

Sets the text in the combobox's text edit.

Definition at line 2978 of file qcombobox.cpp.

◆ setFrame()

void QComboBox::setFrame ( bool enable )

Definition at line 3562 of file qcombobox.cpp.

◆ setIconSize()

void QComboBox::setIconSize ( const QSize & size )

Definition at line 1698 of file qcombobox.cpp.

◆ setInsertPolicy()

void QComboBox::setInsertPolicy ( InsertPolicy policy )

Definition at line 1612 of file qcombobox.cpp.

◆ setItemData()

void QComboBox::setItemData	(	int	index,
		const QVariant &	value,
		int	role = Qt::UserRole )

Sets the data role for the item on the given index in the combobox to the specified value.

Definition at line 2475 of file qcombobox.cpp.

◆ setItemDelegate()

void QComboBox::setItemDelegate ( QAbstractItemDelegate * delegate )

Sets the item delegate for the popup list view.

The combobox takes ownership of the delegate.

Any existing delegate will be removed, but not deleted. QComboBox does not take ownership of delegate.

Warning: You should not share the same instance of a delegate between comboboxes, widget mappers or views. Doing so can cause incorrect or unintuitive editing behavior since each view connected to a given delegate may receive the \l{QAbstractItemDelegate::}{closeEditor()} signal, and attempt to access, modify or close an editor that has already been closed.

See also: itemDelegate()

Definition at line 2022 of file qcombobox.cpp.

◆ setItemIcon()

void QComboBox::setItemIcon	(	int	index,
		const QIcon &	icon )

Sets the icon for the item on the given index in the combobox.

Definition at line 2462 of file qcombobox.cpp.

◆ setItemText()

void QComboBox::setItemText	(	int	index,
		const QString &	text )

Sets the text for the item on the given index in the combobox.

Definition at line 2450 of file qcombobox.cpp.

◆ setLabelDrawingMode()

void QComboBox::setLabelDrawingMode ( LabelDrawingMode labelDrawing )

Definition at line 3635 of file qcombobox.cpp.

◆ setLineEdit()

void QComboBox::setLineEdit ( QLineEdit * edit )

Sets the line edit to use instead of the current line edit widget.

The combo box takes ownership of the line edit.

Note: Since the combobox's line edit owns the QCompleter, any previous call to setCompleter() will no longer have any effect.

Definition at line 1842 of file qcombobox.cpp.

◆ setMaxCount()

void QComboBox::setMaxCount ( int max )

Definition at line 1529 of file qcombobox.cpp.

◆ setMaxVisibleItems()

void QComboBox::setMaxVisibleItems ( int maxItems )

Definition at line 1494 of file qcombobox.cpp.

◆ setMinimumContentsLength()

void QComboBox::setMinimumContentsLength ( int characters )

Definition at line 1663 of file qcombobox.cpp.

◆ setModel()

void QComboBox::setModel ( QAbstractItemModel * model )

virtual

Sets the model to be model.

model must not be \nullptr. If you want to clear the contents of a model, call clear().

Note: If the combobox is editable, then the model will also be set on the completer of the line edit.

See also: clear() setCompleter()

Definition at line 2054 of file qcombobox.cpp.

◆ setModelColumn()

void QComboBox::setModelColumn ( int visibleColumn )

Definition at line 3589 of file qcombobox.cpp.

◆ setPlaceholderText()

void QComboBox::setPlaceholderText ( const QString & placeholderText )

Definition at line 1726 of file qcombobox.cpp.

◆ setRootModelIndex()

void QComboBox::setRootModelIndex ( const QModelIndex & index )

Sets the root model item index for the items in the combobox.

See also: rootModelIndex()

Definition at line 2141 of file qcombobox.cpp.

◆ setSizeAdjustPolicy()

void QComboBox::setSizeAdjustPolicy ( QComboBox::SizeAdjustPolicy policy )

Definition at line 1634 of file qcombobox.cpp.

◆ setValidator()

void QComboBox::setValidator ( const QValidator * validator )

Sets the validator to use instead of the current validator.

Note: The validator is removed when the \l editable property becomes false.

Definition at line 1930 of file qcombobox.cpp.

◆ setView()

void QComboBox::setView ( QAbstractItemView * itemView )

Sets the view to be used in the combobox popup to the given itemView.

The combobox takes ownership of the view.

Note: If you want to use the convenience views (like QListWidget, QTableWidget or QTreeWidget), make sure to call setModel() on the combobox with the convenience widgets model before calling this function.

Definition at line 2502 of file qcombobox.cpp.

◆ showEvent()

void QComboBox::showEvent ( QShowEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QWidget.

Definition at line 3116 of file qcombobox.cpp.

◆ showPopup()

void QComboBox::showPopup ( )

virtual

Displays the list of items in the combobox.

If the list is empty then no items will be shown.

If you reimplement this function to show a custom pop-up, make sure you call hidePopup() to reset the internal state.

See also: hidePopup()

Reimplemented in QFileDialogComboBox.

Definition at line 2637 of file qcombobox.cpp.

◆ sizeAdjustPolicy()

QComboBox::SizeAdjustPolicy QComboBox::sizeAdjustPolicy ( ) const

Definition at line 1628 of file qcombobox.cpp.

◆ sizeHint()

QSize QComboBox::sizeHint ( ) const

overridevirtual

\reimp

This implementation caches the size hint to avoid resizing when the contents change dynamically. To invalidate the cached value change the \l sizeAdjustPolicy.

Reimplemented from QWidget.

Reimplemented in QFontComboBox.

Definition at line 2534 of file qcombobox.cpp.

◆ textActivated

void QComboBox::textActivated ( const QString & text )

signal

Since: 5.14

This signal is sent when the user chooses an item in the combobox. The item's text is passed. Note that this signal is sent even when the choice is not changed. If you need to know when the choice actually changes, use signal currentIndexChanged() or currentTextChanged().

◆ textHighlighted

void QComboBox::textHighlighted ( const QString & text )

signal

Since: 5.14

This signal is sent when an item in the combobox popup list is highlighted by the user. The item's text is passed.

◆ validator()

const QValidator * QComboBox::validator ( ) const

Returns the validator that is used to constrain text input for the combobox.

See also: editable

Definition at line 1943 of file qcombobox.cpp.

◆ view()

QAbstractItemView * QComboBox::view ( ) const

Returns the list view used for the combobox popup.

Definition at line 2487 of file qcombobox.cpp.

Property Documentation

◆ count

int QComboBox::count

read

the number of items in the combobox.

By default, for an empty combo box, this property has a value of 0.

Definition at line 28 of file qcombobox.h.

◆ currentData

QVariant QComboBox::currentData

read

the data for the current item

Since: 5.2

By default, for an empty combo box or a combo box in which no current item is set, this property contains an invalid QVariant.

Definition at line 32 of file qcombobox.h.

◆ currentIndex

int QComboBox::currentIndex

readwrite

the index of the current item in the combobox.

The current index can change when inserting or removing items.

By default, for an empty combo box or a combo box in which no current item is set, this property has a value of -1.

Definition at line 31 of file qcombobox.h.

◆ currentText

QString QComboBox::currentText

readwrite

the current text

If the combo box is editable, the current text is the value displayed by the line edit. Otherwise, it is the value of the current item or an empty string if the combo box is empty or no current item is set.

The setter setCurrentText() simply calls setEditText() if the combo box is editable. Otherwise, if there is a matching text in the list, currentIndex is set to the corresponding index.

See also: editable, setEditText()

Definition at line 29 of file qcombobox.h.

◆ duplicatesEnabled

bool QComboBox::duplicatesEnabled

readwrite

whether the user can enter duplicate items into the combobox.

Note that it is always possible to programmatically insert duplicate items into the combobox.

By default, this property is false (duplicates are not allowed).

Definition at line 40 of file qcombobox.h.

◆ editable

bool QComboBox::editable

readwrite

whether the combo box can be edited by the user.

By default, this property is false. The effect of editing depends on the insert policy.

Note: When disabling the editable state, the validator and completer are removed.

See also: InsertPolicy

Definition at line 27 of file qcombobox.h.

◆ frame

bool QComboBox::frame

readwrite

whether the combo box draws itself with a frame.

If enabled (the default) the combo box draws itself inside a frame, otherwise the combo box draws itself without any frame.

Definition at line 41 of file qcombobox.h.

◆ iconSize

QSize QComboBox::iconSize

readwrite

the size of the icons shown in the combobox.

Unless explicitly set this returns the default value of the current style. This size is the maximum size that icons can have; icons of smaller size are not scaled up.

Definition at line 38 of file qcombobox.h.

◆ insertPolicy

InsertPolicy QComboBox::insertPolicy

readwrite

the policy used to determine where user-inserted items should appear in the combobox.

The default value is \l InsertAtBottom, indicating that new items will appear at the bottom of the list of items.

See also: InsertPolicy

Definition at line 35 of file qcombobox.h.

◆ labelDrawingMode

LabelDrawingMode QComboBox::labelDrawingMode

readwrite

the mode used by the combobox to draw its label.

Since: 6.9

The default value is \l{QComboBox::}{UseStyle}. When changing this property to UseDelegate, make sure to also set a suitable \l{itemDelegate()}{item delegate}. The default delegate depends on the style and might not be suitable for drawing the label.

See also: {Books}{Books example}

Definition at line 43 of file qcombobox.h.

◆ maxCount

int QComboBox::maxCount

readwrite

the maximum number of items allowed in the combobox.

Note: If you set the maximum number to be less then the current amount of items in the combobox, the extra items will be truncated. This also applies if you have set an external model on the combobox.

By default, this property's value is derived from the highest signed integer available (typically 2147483647).

Definition at line 34 of file qcombobox.h.

◆ maxVisibleItems

int QComboBox::maxVisibleItems

readwrite

the maximum allowed size on screen of the combo box, measured in items

By default, this property has a value of 10.

Note: This property is ignored for non-editable comboboxes in styles that returns true for QStyle::SH_ComboBox_Popup such as the Mac style or the Gtk+ Style.

Definition at line 33 of file qcombobox.h.

◆ minimumContentsLength

int QComboBox::minimumContentsLength

readwrite

the minimum number of characters that should fit into the combobox.

The default value is 0.

If this property is set to a positive value, the minimumSizeHint() and sizeHint() take it into account.

See also: sizeAdjustPolicy

Definition at line 37 of file qcombobox.h.

◆ modelColumn

int QComboBox::modelColumn

readwrite

the column in the model that is visible.

If set prior to populating the combo box, the pop-up view will not be affected and will show the first column (using this property's default value).

By default, this property has a value of 0.

Note: In an editable combobox, the visible column will also become the \l{QCompleter::completionColumn}{completion column}.

Definition at line 42 of file qcombobox.h.

◆ placeholderText

QString QComboBox::placeholderText

readwrite

Sets a placeholderText text shown when no valid index is set.

The placeholderText will be shown when an invalid index is set. The text is not accessible in the dropdown list. When this function is called before items are added the placeholder text will be shown, otherwise you have to call setCurrentIndex(-1) programmatically if you want to show the placeholder text. Set an empty placeholder text to reset the setting.

When the QComboBox is editable, use QLineEdit::setPlaceholderText() instead.

Since: 5.15

Definition at line 39 of file qcombobox.h.

◆ sizeAdjustPolicy

SizeAdjustPolicy QComboBox::sizeAdjustPolicy

readwrite

the policy describing how the size of the combobox changes when the content changes.

The default value is \l AdjustToContentsOnFirstShow.

See also: SizeAdjustPolicy

Definition at line 36 of file qcombobox.h.

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

qtbase/src/widgets/widgets/qcombobox.h (0ac8ab0d2011e0696d6d794cbf78ac2ca87f9460)
qtbase/src/widgets/widgets/qcombobox.cpp (0ac8ab0d2011e0696d6d794cbf78ac2ca87f9460)

Public Types

Public Slots

Signals

Public Member Functions

Protected Member Functions

Properties

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ InsertPolicy

◆ LabelDrawingMode

◆ SizeAdjustPolicy

Constructor & Destructor Documentation

◆ QComboBox() [1/2]

◆ ~QComboBox()

◆ QComboBox() [2/2]

Member Function Documentation

◆ activated

◆ addItem() [1/2]

◆ addItem() [2/2]

◆ addItems()

◆ changeEvent()

◆ clear

◆ clearEditText

◆ contextMenuEvent()

◆ count()

◆ currentData()

◆ currentIndex()

◆ currentIndexChanged

◆ currentText()

◆ currentTextChanged

◆ duplicatesEnabled()

◆ editTextChanged

◆ event()

◆ findData()

◆ findText()

◆ focusInEvent()

◆ focusOutEvent()

◆ hasFrame()

◆ hideEvent()

◆ hidePopup()

◆ highlighted

◆ iconSize()

◆ initStyleOption()

◆ inputMethodEvent()

◆ inputMethodQuery() [1/2]

◆ inputMethodQuery() [2/2]

◆ insertItem() [1/2]

◆ insertItem() [2/2]

◆ insertItems()

◆ insertPolicy()

◆ insertSeparator()

◆ isEditable()

◆ itemData()

◆ itemDelegate()

◆ itemIcon()

◆ itemText()

◆ keyPressEvent()

◆ keyReleaseEvent()

◆ labelDrawingMode()

◆ lineEdit()

◆ maxCount()

◆ maxVisibleItems()

◆ minimumContentsLength()

◆ minimumSizeHint()

◆ model()

◆ modelColumn()

◆ mousePressEvent()

◆ mouseReleaseEvent()

◆ paintEvent()

◆ placeholderText()

◆ removeItem()

◆ resizeEvent()

◆ rootModelIndex()

◆ setCurrentIndex

◆ setCurrentText

◆ setDuplicatesEnabled()

◆ setEditable()

◆ setEditText

◆ setFrame()