The QDial class provides a rounded range control (like a speedometer or potentiometer). More...

#include <qdial.h>

Inheritance diagram for QDial:

Public Slots
void	setNotchesVisible (bool visible)

void	setWrapping (bool on)

Public Slots inherited from QAbstractSlider
void	setOrientation (Qt::Orientation)

void	setValue (int)

Public Slots inherited from QWidget
bool	close ()
	Closes this widget. More...

void	hide ()
	Hides the widget. More...

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

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

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

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

void	setEnabled (bool)

void	setFocus ()
	Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the active window. More...

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

QT_MOC_COMPAT void	setShown (bool shown)
	Use setVisible(shown) instead. More...

void	setStyleSheet (const QString &styleSheet)

virtual void	setVisible (bool visible)

void	setWindowModified (bool)

void	setWindowTitle (const QString &)

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

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

void	showMaximized ()
	Shows the widget maximized. More...

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

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

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

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

Public Functions
QSize	minimumSizeHint () const
	Reimplemented Function More...

bool	notchesVisible () const

int	notchSize () const

qreal	notchTarget () const

	QDial (QWidget *parent=0)
	Constructs a dial. More...

void	setNotchTarget (double target)

QSize	sizeHint () const
	Reimplemented Function More...

bool	wrapping () const

	~QDial ()
	Destroys the dial. More...

Public Functions inherited from QAbstractSlider
bool	hasTracking () const

bool	invertedAppearance () const

bool	invertedControls () const

bool	isSliderDown () const

int	maximum () const

int	minimum () const

Qt::Orientation	orientation () const

int	pageStep () const

	QAbstractSlider (QWidget *parent=0)
	Constructs an abstract slider. More...

void	setInvertedAppearance (bool)

void	setInvertedControls (bool)

void	setMaximum (int)

void	setMinimum (int)

void	setPageStep (int)

void	setRange (int min, int max)
	Sets the slider's minimum to min and its maximum to max. More...

void	setSingleStep (int)

void	setSliderDown (bool)

void	setSliderPosition (int)

void	setTracking (bool enable)

int	singleStep () const

int	sliderPosition () const

void	triggerAction (SliderAction action)
	Triggers a slider action. More...

int	value () const

	~QAbstractSlider ()
	Destroys the slider. More...

Public Functions inherited from QWidget
bool	acceptDrops () const

QString	accessibleDescription () const

QString	accessibleName () const

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

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

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

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

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

bool	autoFillBackground () const

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

QSize	baseSize () const

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

QWidget *	childAt (const QPoint &p) const
	Returns the visible child widget at point p in the widget's own coordinate system. More...

QRect	childrenRect () const

QRegion	childrenRegion () const

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

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

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

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

Qt::ContextMenuPolicy	contextMenuPolicy () const

void	createWinId ()

QCursor	cursor () const

int	devType () const

WId	effectiveWinId () const
	Returns the effective window system identifier of the widget, i. More...

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

Qt::FocusPolicy	focusPolicy () const

QWidget *	focusProxy () const
	Returns the focus proxy, or 0 if there is no focus proxy. More...

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

const QFont &	font () const

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

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

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

QRect	frameGeometry () const

QSize	frameSize () const

const QRect &	geometry () const

void	getContentsMargins (int left, int top, int right, int bottom) const
	Returns the widget's contents margins for left, top, right, and bottom. More...

HDC	getDC () const
	Returns the window system handle of the widget, for low-level access. More...

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

void	grabKeyboard ()
	Grabs the keyboard input. More...

void	grabMouse ()
	Grabs the mouse input. More...

void	grabMouse (const QCursor &)

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. More...

QGraphicsEffect *	graphicsEffect () const
	The graphicsEffect function returns a pointer to the widget's graphics effect. More...

QGraphicsProxyWidget *	graphicsProxyWidget () const
	Returns the proxy widget for the corresponding embedded widget in a graphics view; otherwise returns 0. More...

bool	hasFocus () const

bool	hasMouseTracking () const

int	height () const

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

QInputContext *	inputContext ()
	This function returns the QInputContext for this widget. More...

Qt::InputMethodHints	inputMethodHints () const

virtual QVariant	inputMethodQuery (Qt::InputMethodQuery) const
	This method is only relevant for input widgets. More...

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

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

WId	internalWinId () const
	Returns the window system identifier of the widget, or 0 if the widget is not created yet. More...

bool	isActiveWindow () const

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. More...

bool	isEnabled () const

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

bool	isEnabledToTLW () const
	This function is deprecated. More...

bool	isFullScreen () const

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

bool	isLeftToRight () const

bool	isMaximized () const

bool	isMinimized () const

bool	isModal () const

bool	isRightToLeft () const

bool	isTopLevel () const
	Use isWindow() instead. More...

bool	isVisible () const

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

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

bool	isWindowModified () const

QLayout *	layout () const
	Returns the layout manager that is installed on this widget, or 0 if no layout manager is installed. More...

Qt::LayoutDirection	layoutDirection () const

QLocale	locale () const

Qt::HANDLE	macCGHandle () const
	Returns the CoreGraphics handle of the widget. More...

Qt::HANDLE	macQDHandle () const
	Returns the QuickDraw handle of the widget. More...

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

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

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

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

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

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

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

int	maximumHeight () const

QSize	maximumSize () const

int	maximumWidth () const

int	minimumHeight () const

QSize	minimumSize () const

int	minimumWidth () const

void	move (int x, int y)
	This corresponds to move(QPoint(x, y)). More...

void	move (const QPoint &)

QWidget *	nativeParentWidget () const
	Returns the native parent for this widget, i. More...

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

QRect	normalGeometry () const

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

void	overrideWindowState (Qt::WindowStates state)

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

const QPalette &	palette () const

QWidget *	parentWidget () const
	Returns the parent of this widget, or 0 if it does not have any parent widget. More...

QPoint	pos () const

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

	QWidget (QWidget *parent=0, Qt::WindowFlags f=0)
	Constructs a widget which is a child of parent, with widget flags set to f. More...

QRect	rect () const

void	releaseDC (HDC) const
	Releases the HDC hdc acquired by a previous call to getDC(). More...

void	releaseKeyboard ()
	Releases the keyboard grab. More...

void	releaseMouse ()
	Releases the mouse grab. More...

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

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

void	render (QPaintDevice *target, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground\|DrawChildren))
	Renders the sourceRegion of this widget into the target using renderFlags to determine how to render. More...

void	render (QPainter *painter, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground\|DrawChildren))
	Renders the widget into the painter's QPainter::device(). More...

void	repaint (int x, int y, int w, int h)
	This version repaints a rectangle (x, y, w, h) inside the widget. More...

void	repaint (const QRect &)
	This version repaints a rectangle rect inside the widget. More...

void	repaint (const QRegion &)
	This version repaints a region rgn inside the widget. More...

void	resize (int w, int h)
	This corresponds to resize(QSize(w, h)). More...

void	resize (const QSize &)

bool	restoreGeometry (const QByteArray &geometry)
	Restores the geometry and state top-level widgets stored in the byte array geometry. More...

QByteArray	saveGeometry () const
	Saves the current geometry and state for top-level widgets. More...

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

void	scroll (int dx, int dy, const QRect &)
	This version only scrolls r and does not move the children of the widget. More...

void	setAcceptDrops (bool on)

void	setAccessibleDescription (const QString &description)

void	setAccessibleName (const QString &name)

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

void	setAutoFillBackground (bool enabled)

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

void	setBaseSize (const QSize &)

void	setBaseSize (int basew, int baseh)
	This corresponds to setBaseSize(QSize(basew, baseh)). More...

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. More...

void	setContentsMargins (const QMargins &margins)
	The setContentsMargins function sets the margins around the widget's contents. More...

void	setContextMenuPolicy (Qt::ContextMenuPolicy policy)

void	setCursor (const QCursor &)

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

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

void	setFixedSize (int w, int h)
	Sets the width of the widget to w and the height to h. More...

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

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 active window. More...

void	setFocusPolicy (Qt::FocusPolicy policy)

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

void	setFont (const QFont &)
	Use the single-argument overload instead. More...

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

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)). More...

void	setGeometry (const QRect &)

void	setGraphicsEffect (QGraphicsEffect *effect)
	The setGraphicsEffect function is for setting the widget's graphics effect. More...

void	setInputContext (QInputContext *)
	This function sets the input context context on this widget. More...

void	setInputMethodHints (Qt::InputMethodHints hints)

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

void	setLayoutDirection (Qt::LayoutDirection direction)

void	setLocale (const QLocale &locale)

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

void	setMask (const QRegion &)
	Causes only the parts of the widget which overlap region to be visible. More...

void	setMaximumHeight (int maxh)

void	setMaximumSize (const QSize &)

void	setMaximumSize (int maxw, int maxh)
	This function corresponds to setMaximumSize(QSize(maxw, maxh)). More...

void	setMaximumWidth (int maxw)

void	setMinimumHeight (int minh)

void	setMinimumSize (const QSize &)

void	setMinimumSize (int minw, int minh)
	This function corresponds to setMinimumSize(QSize(minw, minh)). More...

void	setMinimumWidth (int minw)

void	setMouseTracking (bool enable)

void	setPalette (const QPalette &)
	Use the single-argument overload instead. More...

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

void	setParent (QWidget *parent, Qt::WindowFlags f)
	This function also takes widget flags, f as an argument. More...

void	setShortcutAutoRepeat (int id, bool enable=true)
	If enable is true, auto repeat of the shortcut with the given id is enabled; otherwise it is disabled. More...

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

void	setSizeIncrement (const QSize &)

void	setSizeIncrement (int w, int h)
	Sets the x (width) size increment to w and the y (height) size increment to h. More...

void	setSizePolicy (QSizePolicy)

void	setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical)
	Sets the size policy of the widget to horizontal and vertical, with standard stretch and no height-for-width. More...

void	setStatusTip (const QString &)

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

void	setToolTip (const QString &)

void	setUpdatesEnabled (bool enable)

void	setupUi (QWidget *widget)
	Sets up the user interface for the specified widget. More...

void	setWhatsThis (const QString &)

void	setWindowFilePath (const QString &filePath)

void	setWindowFlags (Qt::WindowFlags type)

void	setWindowIcon (const QIcon &icon)

void	setWindowIconText (const QString &)

void	setWindowModality (Qt::WindowModality windowModality)

void	setWindowOpacity (qreal level)

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

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

void	setWindowSurface (QWindowSurface *surface)
	Sets the window surface to be the surface specified. More...

QSize	size () const

QSize	sizeIncrement () const

QSizePolicy	sizePolicy () const

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

QString	statusTip () const

QStyle *	style () const

QString	styleSheet () const

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

QString	toolTip () const

QWidget *	topLevelWidget () const

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

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

void	unsetCursor ()

void	unsetLayoutDirection ()

void	unsetLocale ()

void	update (int x, int y, int w, int h)
	This version updates a rectangle (x, y, w, h) inside the widget. More...

void	update (const QRect &)
	This version updates a rectangle rect inside the widget. More...

void	update (const QRegion &)
	This version repaints a region rgn inside the widget. More...

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

bool	updatesEnabled () const

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

QString	whatsThis () const

int	width () const

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

QString	windowFilePath () const

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

QIcon	windowIcon () const

QString	windowIconText () const

Qt::WindowModality	windowModality () const

qreal	windowOpacity () const

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

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

QWindowSurface *	windowSurface () const
	Returns the QWindowSurface this widget will be drawn into. More...

QString	windowTitle () const

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

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

int	x () const

const QX11Info &	x11Info () const
	Returns information about the configuration of the X display used to display the widget. More...

Qt::HANDLE	x11PictureHandle () const
	Returns the X11 Picture handle of the widget for XRender support. More...

int	y () const

	~QWidget ()
	Destroys the widget. 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	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 QPaintDevice
int	colorCount () const

int	depth () const

int	height () const

int	heightMM () const

int	logicalDpiX () const

int	logicalDpiY () const

QT_DEPRECATED int	numColors () const

bool	paintingActive () const

int	physicalDpiX () const

int	physicalDpiY () const

int	width () const

int	widthMM () const

virtual	~QPaintDevice ()

Protected Functions
bool	event (QEvent *e)
	Reimplemented Function More...

void	initStyleOption (QStyleOptionSlider *option) const
	Initialize option with the values from this QDial. More...

void	mouseMoveEvent (QMouseEvent *me)
	Reimplemented Function More...

void	mousePressEvent (QMouseEvent *me)
	Reimplemented Function More...

void	mouseReleaseEvent (QMouseEvent *me)
	Reimplemented Function More...

void	paintEvent (QPaintEvent *pe)
	Reimplemented Function More...

void	resizeEvent (QResizeEvent *re)
	Reimplemented Function More...

void	sliderChange (SliderChange change)
	Reimplemented Function More...

Protected Functions inherited from QAbstractSlider
void	changeEvent (QEvent *e)
	Reimplemented Function More...

void	keyPressEvent (QKeyEvent *ev)
	Reimplemented Function More...

	QAbstractSlider (QAbstractSliderPrivate &dd, QWidget *parent=0)

SliderAction	repeatAction () const
	Returns the current repeat action. More...

void	setRepeatAction (SliderAction action, int thresholdTime=500, int repeatTime=50)
	Sets action action to be triggered repetitively in intervals of repeatTime, after an initial delay of thresholdTime. More...

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

void	wheelEvent (QWheelEvent *e)
	Reimplemented Function More...

Protected Functions inherited from QWidget
virtual void	actionEvent (QActionEvent *)
	This event handler is called with the given event whenever the widget's actions are changed. More...

virtual void	closeEvent (QCloseEvent *)
	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. More...

virtual void	contextMenuEvent (QContextMenuEvent *)
	This event handler, for event event, can be reimplemented in a subclass to receive widget context menu events. More...

void	create (WId=0, bool initializeWindow=true, bool destroyOldWindow=true)
	Creates a new widget window if window is 0, otherwise sets the widget's window to window. More...

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

virtual void	dragEnterEvent (QDragEnterEvent *)
	This event handler is called when a drag is in progress and the mouse enters this widget. More...

virtual void	dragLeaveEvent (QDragLeaveEvent *)
	This event handler is called when a drag is in progress and the mouse leaves this widget. More...

virtual void	dragMoveEvent (QDragMoveEvent *)
	This event handler is called if a drag is in progress, and when any of the following conditions occur: the cursor enters this widget, the cursor moves within this widget, or a modifier key is pressed on the keyboard while this widget has the focus. More...

virtual void	dropEvent (QDropEvent *)
	This event handler is called when the drag is dropped on this widget. More...

virtual void	enabledChange (bool)

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

virtual void	focusInEvent (QFocusEvent *)
	This event handler can be reimplemented in a subclass to receive keyboard focus events (focus received) for the widget. More...

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

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. More...

virtual void	focusOutEvent (QFocusEvent *)
	This event handler can be reimplemented in a subclass to receive keyboard focus events (focus lost) for the widget. More...

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

virtual void	fontChange (const QFont &)

virtual void	hideEvent (QHideEvent *)
	This event handler can be reimplemented in a subclass to receive widget hide events. More...

virtual void	inputMethodEvent (QInputMethodEvent *)
	This event handler, for event event, can be reimplemented in a subclass to receive Input Method composition events. More...

virtual void	keyReleaseEvent (QKeyEvent *)
	This event handler, for event event, can be reimplemented in a subclass to receive key release events for the widget. More...

virtual void	languageChange ()

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

virtual bool	macEvent (EventHandlerCallRef, EventRef)
	This special event handler can be reimplemented in a subclass to receive native Macintosh events. More...

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

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

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

virtual void	paletteChange (const QPalette &)

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

virtual bool	qwsEvent (QWSEvent *)
	This special event handler can be reimplemented in a subclass to receive native Qt for Embedded Linux events which are passed in the event parameter. More...

void	resetInputContext ()
	This function can be called on the widget that currently has focus to reset the input method operating on it. More...

virtual void	showEvent (QShowEvent *)
	This event handler can be reimplemented in a subclass to receive widget show events which are passed in the event parameter. More...

virtual void	styleChange (QStyle &)

virtual void	tabletEvent (QTabletEvent *)
	This event handler, for event event, can be reimplemented in a subclass to receive tablet events for the widget. More...

virtual void	windowActivationChange (bool)

virtual bool	winEvent (MSG message, long result)
	This special event handler can be reimplemented in a subclass to receive native Windows events which are passed in the message parameter. More...

virtual bool	x11Event (XEvent *)
	This special event handler can be reimplemented in a subclass to receive native X11 events passed in the event parameter. More...

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

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

Protected Functions inherited from QPaintDevice
	QPaintDevice ()

Properties
bool	notchesVisible
	whether the notches are shown More...

int	notchSize
	the current notch size More...

qreal	notchTarget
	the target number of pixels between notches More...

bool	wrapping
	whether wrapping is enabled More...

Additional Inherited Members
Public Types inherited from QAbstractSlider
enum	SliderAction { SliderNoAction, SliderSingleStepAdd, SliderSingleStepSub, SliderPageStepAdd, SliderPageStepSub, SliderToMinimum, SliderToMaximum, SliderMove }

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 }

Signals inherited from QAbstractSlider
void	actionTriggered (int action)
	This signal is emitted when the slider action action is triggered. More...

void	rangeChanged (int min, int max)
	This signal is emitted when the slider range has changed, with min being the new minimum, and max being the new maximum. More...

void	sliderMoved (int position)
	This signal is emitted when sliderDown is true and the slider moves. More...

void	sliderPressed ()
	This signal is emitted when the user presses the slider with the mouse, or programmatically when setSliderDown(true) is called. More...

void	sliderReleased ()
	This signal is emitted when the user releases the slider with the mouse, or programmatically when setSliderDown(false) is called. More...

void	valueChanged (int value)
	This signal is emitted when the slider value has changed, with the new slider value as argument. More...

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

Static Public Functions inherited from QWidget
static QWidget *	find (WId)
	Returns a pointer to the widget with window identifer/handle id. More...

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

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

static void	setTabOrder (QWidget , QWidget )
	Puts the second widget after the first widget in the focus order. 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 Functions inherited from QPaintDevice
static QWSDisplay *	qwsDisplay ()

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

Protected Types inherited from QAbstractSlider
enum	SliderChange { SliderRangeChange, SliderOrientationChange, SliderStepsChange, SliderValueChange }

Protected Slots inherited from QWidget
void	updateMicroFocus ()
	Updates the widget's micro focus. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Protected Variables inherited from QPaintDevice
ushort	painters

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QWidget
	QWidgetList

	WId
	Platform dependent window identifier. More...

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...

Related Functions inherited from QPaintDevice
const Q_GUI_EXPORT QX11Info *	qt_x11Info (const QPaintDevice *pd)
	Returns the QX11Info structure for the pd paint device. More...

Detailed Description

The QDial class provides a rounded range control (like a speedometer or potentiometer).

QDial is used when the user needs to control a value within a program-definable range, and the range either wraps around (for example, with angles measured from 0 to 359 degrees) or the dialog layout needs a square widget.

Since QDial inherits from QAbstractSlider, the dial behaves in a similar way to a slider. When wrapping() is false (the default setting) there is no real difference between a slider and a dial. They both share the same signals, slots and member functions. Which one you use depends on the expectations of your users and on the type of application.

The dial initially emits valueChanged() signals continuously while the slider is being moved; you can make it emit the signal less often by disabling the tracking property. The sliderMoved() signal is emitted continuously even when tracking is disabled.

The dial also emits sliderPressed() and sliderReleased() signals when the mouse button is pressed and released. Note that the dial's value can change without these signals being emitted since the keyboard and wheel can also be used to change the value.

Unlike the slider, QDial attempts to draw a "nice" number of notches rather than one per line step. If possible, the number of notches drawn is one per line step, but if there aren't enough pixels to draw every one, QDial will skip notches to try and draw a uniform set (e.g. by drawing every second or third notch).

Like the slider, the dial makes the QAbstractSlider functions setValue(), addLine(), subtractLine(), addPage() and subtractPage() available as slots.

The dial's keyboard interface is fairly simple: The left/up and right/down arrow keys adjust the dial's QAbstractSlider::value {value} by the defined QAbstractSlider::singleStep {singleStep}, Page Up and Page Down by the defined QAbstractSlider::pageStep {pageStep}, and the Home and End keys set the value to the defined QAbstractSlider::minimum {minimum} and QAbstractSlider::maximum {maximum} values.

If you are using the mouse wheel to adjust the dial, the increment value is determined by the lesser value of wheelScrollLines multipled by QAbstractSlider::singleStep {singleStep}, and QAbstractSlider::pageStep {pageStep}.

Screenshot of a dial in the Plastique widget style	Screenshot of a dial in the Windows XP widget style	Screenshot of a dial in the Macintosh widget style
Dials shown in various widget styles (from left to right): Plastique Style Widget Gallery{Plastique}, Windows XP Style Widget Gallery{Windows XP}, Macintosh Style Widget Gallery{Macintosh}.

See also: QScrollBar, QSpinBox, QSlider, {fowler}{GUI Design Handbook: Slider}, {Sliders Example}

Definition at line 59 of file qdial.h.

Constructors and Destructors

◆ QDial()

QDial::QDial ( QWidget * parent = 0 )

explicit

Constructs a dial.

The parent argument is sent to the QAbstractSlider constructor.

Definition at line 258 of file qdial.cpp.

     : QAbstractSlider(*new QDialPrivate, parent)
 {
     Q_D(QDial);
     d->init();
 }

◆ ~QDial()

QDial::~QDial ( )

Destroys the dial.

Definition at line 298 of file qdial.cpp.

299 {

300 }

Functions

◆ event()

bool QDial::event ( QEvent * e )

protectedvirtual

Reimplemented Function

Reimplemented from QAbstractSlider.

Definition at line 536 of file qdial.cpp.

 {
     return QAbstractSlider::event(e);
 }

◆ initStyleOption()

void QDial::initStyleOption ( QStyleOptionSlider * option ) const

protected

Initialize option with the values from this QDial.

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

See also: QStyleOption::initFrom()

Definition at line 122 of file qdial.cpp.

Referenced by paintEvent().

 {
     if (!option)
         return;
 
     Q_D(const QDial);
     option->initFrom(this);
     option->minimum = d->minimum;
     option->maximum = d->maximum;
     option->sliderPosition = d->position;
     option->sliderValue = d->value;
     option->singleStep = d->singleStep;
     option->pageStep = d->pageStep;
     option->upsideDown = !d->invertedAppearance;
     option->notchTarget = d->target;
     option->dialWrapping = d->wrapping;
     option->subControls = QStyle::SC_All;
     option->activeSubControls = QStyle::SC_None;
     if (!d->showNotches) {
         option->subControls &= ~QStyle::SC_DialTickmarks;
         option->tickPosition = QSlider::TicksAbove;
     } else {
         option->tickPosition = QSlider::NoTicks;
     }
     option->tickInterval = notchSize();
 }

◆ minimumSizeHint()

QSize QDial::minimumSizeHint ( ) const

virtual

Reimplemented Function

Reimplemented from QWidget.

Definition at line 519 of file qdial.cpp.

 {
     return QSize(50, 50);
 }

◆ mouseMoveEvent()

void QDial::mouseMoveEvent ( QMouseEvent * me )

protectedvirtual

Reimplemented Function

Reimplemented from QWidget.

Definition at line 365 of file qdial.cpp.

 {
     Q_D(QDial);
     if (!(e->buttons() & Qt::LeftButton)) {
         e->ignore();
         return;
     }
     e->accept();
     d->doNotEmit = true;
     setSliderPosition(d->valueFromPoint(e->pos()));
     d->doNotEmit = false;
 }

◆ mousePressEvent()

void QDial::mousePressEvent ( QMouseEvent * me )

protectedvirtual

Reimplemented Function

Reimplemented from QWidget.

Definition at line 324 of file qdial.cpp.

 {
     Q_D(QDial);
     if (d->maximum == d->minimum ||
         (e->button() != Qt::LeftButton)  ||
         (e->buttons() ^ e->button())) {
         e->ignore();
         return;
     }
     e->accept();
     setSliderPosition(d->valueFromPoint(e->pos()));
     // ### This isn't quite right,
     // we should be doing a hit test and only setting this if it's
     // the actual dial thingie (similar to what QSlider does), but we have no
     // subControls for QDial.
     setSliderDown(true);
 }

◆ mouseReleaseEvent()

void QDial::mouseReleaseEvent ( QMouseEvent * me )

protectedvirtual

Reimplemented Function

Reimplemented from QWidget.

Definition at line 347 of file qdial.cpp.

 {
     Q_D(QDial);
     if (e->buttons() & (~e->button()) ||
        (e->button() != Qt::LeftButton)) {
         e->ignore();
         return;
     }
     e->accept();
     setValue(d->valueFromPoint(e->pos()));
     setSliderDown(false);
 }

◆ notchesVisible()

bool QDial::notchesVisible ( ) const

Referenced by setNotchesVisible().

◆ notchSize()

int QDial::notchSize ( ) const

Referenced by setWrapping().

◆ notchTarget()

qreal QDial::notchTarget ( ) const

Referenced by setNotchTarget().

◆ paintEvent()

void QDial::paintEvent ( QPaintEvent * pe )

protectedvirtual

Reimplemented Function

Reimplemented from QWidget.

Definition at line 312 of file qdial.cpp.

 {
     QStylePainter p(this);
     QStyleOptionSlider option;
     initStyleOption(&option);
     p.drawComplexControl(QStyle::CC_Dial, option);
 }

◆ resizeEvent()

void QDial::resizeEvent ( QResizeEvent * re )

protectedvirtual

Reimplemented Function

Reimplemented from QWidget.

Definition at line 303 of file qdial.cpp.

 {
     QWidget::resizeEvent(e);
 }

◆ setNotchesVisible

void QDial::setNotchesVisible ( bool visible )

slot

Definition at line 489 of file qdial.cpp.

 {
     Q_D(QDial);
     d->showNotches = visible;
     update();
 }

◆ setNotchTarget()

void QDial::setNotchTarget ( double target )

Definition at line 461 of file qdial.cpp.

 {
     Q_D(QDial);
     d->target = target;
     update();
 }

◆ setWrapping

void QDial::setWrapping ( bool on )

slot

Definition at line 388 of file qdial.cpp.

 {
     Q_D(QDial);
     if (d->wrapping == enable)
         return;
     d->wrapping = enable;
     update();
 }

◆ sizeHint()

QSize QDial::sizeHint ( ) const

virtual

Reimplemented Function

Reimplemented from QWidget.

Definition at line 528 of file qdial.cpp.

 {
     return QSize(100, 100).expandedTo(QApplication::globalStrut());
 }

◆ sliderChange()

void QDial::sliderChange ( SliderChange change )

protectedvirtual

Reimplemented Function

Reimplemented from QAbstractSlider.

Definition at line 383 of file qdial.cpp.

 {
     QAbstractSlider::sliderChange(change);
 }

◆ wrapping()

bool QDial::wrapping ( ) const

Referenced by setWrapping().

Properties

◆ notchesVisible

bool QDial::notchesVisible

private

whether the notches are shown

If the property is true, a series of notches are drawn around the dial to indicate the range of values available; otherwise no notches are shown.

By default, this property is disabled.

Definition at line 66 of file qdial.h.

◆ notchSize

int QDial::notchSize

private

the current notch size

The notch size is in range control units, not pixels, and if possible it is a multiple of singleStep() that results in an on-screen notch size near notchTarget().

By default, this property has a value of 1.

See also: notchTarget(), singleStep()

Definition at line 64 of file qdial.h.

◆ notchTarget

qreal QDial::notchTarget

private

the target number of pixels between notches

The notch target is the number of pixels QDial attempts to put between each notch.

The actual size may differ from the target size.

The default notch target is 3.7 pixels.

Definition at line 65 of file qdial.h.

◆ wrapping

bool QDial::wrapping

private

whether wrapping is enabled

If true, wrapping is enabled; otherwise some space is inserted at the bottom of the dial to separate the ends of the range of valid values.

If enabled, the arrow can be oriented at any angle on the dial. If disabled, the arrow will be restricted to the upper part of the dial; if it is rotated into the space at the bottom of the dial, it will be clamped to the closest end of the valid range of values.

By default this property is false.

Definition at line 63 of file qdial.h.

Referenced by QAccessibleDial::rect().

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

/src/gui/widgets/qdial.h
/src/gui/widgets/qdial.cpp

Public Slots

Public Functions

Protected Functions

Properties

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ QDial()

◆ ~QDial()

Functions

◆ event()

◆ initStyleOption()

◆ minimumSizeHint()

◆ mouseMoveEvent()

◆ mousePressEvent()

◆ mouseReleaseEvent()

◆ notchesVisible()

◆ notchSize()

◆ notchTarget()

◆ paintEvent()

◆ resizeEvent()

◆ setNotchesVisible

◆ setNotchTarget()

◆ setWrapping

◆ sizeHint()

◆ sliderChange()

◆ wrapping()

Properties

◆ notchesVisible

◆ notchSize

◆ notchTarget

◆ wrapping