The QPaintEvent class contains event parameters for paint events. More...

#include <qevent.h>

Inheritance diagram for QPaintEvent:

Public Functions
	QPaintEvent (const QRegion &paintRegion)
	Constructs a paint event object with the region that needs to be updated. More...

	QPaintEvent (const QRect &paintRect)
	Constructs a paint event object with the rectangle that needs to be updated. More...

const QRect &	rect () const
	Returns the rectangle that needs to be updated. More...

const QRegion &	region () const
	Returns the region that needs to be updated. More...

	~QPaintEvent ()

Public Functions inherited from QEvent
void	accept ()
	Sets the accept flag of the event object, the equivalent of calling setAccepted(true). More...

void	ignore ()
	Clears the accept flag parameter of the event object, the equivalent of calling setAccepted(false). More...

bool	isAccepted () const

	QEvent (Type type)
	Contructs an event object of type type. More...

void	setAccepted (bool accepted)

bool	spontaneous () const
	Returns true if the event originated outside the application (a system event); otherwise returns false. More...

Type	type () const
	Returns the event type. More...

virtual	~QEvent ()
	Destroys the event. More...

Protected Variables
bool	m_erased

QRect	m_rect

QRegion	m_region

Protected Variables inherited from QEvent
QEventPrivate *	d

ushort	t

Friends
class	QApplication

class	QCoreApplication

Additional Inherited Members
Public Types inherited from QEvent
enum	Type { None = 0, Timer = 1, MouseButtonPress = 2, MouseButtonRelease = 3, MouseButtonDblClick = 4, MouseMove = 5, KeyPress = 6, KeyRelease = 7, FocusIn = 8, FocusOut = 9, Enter = 10, Leave = 11, Paint = 12, Move = 13, Resize = 14, Create = 15, Destroy = 16, Show = 17, Hide = 18, Close = 19, Quit = 20, ParentChange = 21, ParentAboutToChange = 131, ThreadChange = 22, WindowActivate = 24, WindowDeactivate = 25, ShowToParent = 26, HideToParent = 27, Wheel = 31, WindowTitleChange = 33, WindowIconChange = 34, ApplicationWindowIconChange = 35, ApplicationFontChange = 36, ApplicationLayoutDirectionChange = 37, ApplicationPaletteChange = 38, PaletteChange = 39, Clipboard = 40, Speech = 42, MetaCall = 43, SockAct = 50, WinEventAct = 132, DeferredDelete = 52, DragEnter = 60, DragMove = 61, DragLeave = 62, Drop = 63, DragResponse = 64, ChildAdded = 68, ChildPolished = 69, ChildRemoved = 71, ShowWindowRequest = 73, PolishRequest = 74, Polish = 75, LayoutRequest = 76, UpdateRequest = 77, UpdateLater = 78, EmbeddingControl = 79, ActivateControl = 80, DeactivateControl = 81, ContextMenu = 82, InputMethod = 83, AccessibilityPrepare = 86, TabletMove = 87, LocaleChange = 88, LanguageChange = 89, LayoutDirectionChange = 90, Style = 91, TabletPress = 92, TabletRelease = 93, OkRequest = 94, HelpRequest = 95, IconDrag = 96, FontChange = 97, EnabledChange = 98, ActivationChange = 99, StyleChange = 100, IconTextChange = 101, ModifiedChange = 102, MouseTrackingChange = 109, WindowBlocked = 103, WindowUnblocked = 104, WindowStateChange = 105, ToolTip = 110, WhatsThis = 111, StatusTip = 112, ActionChanged = 113, ActionAdded = 114, ActionRemoved = 115, FileOpen = 116, Shortcut = 117, ShortcutOverride = 51, WhatsThisClicked = 118, ToolBarChange = 120, ApplicationActivate = 121, ApplicationActivated = ApplicationActivate, ApplicationDeactivate = 122, ApplicationDeactivated = ApplicationDeactivate, QueryWhatsThis = 123, EnterWhatsThisMode = 124, LeaveWhatsThisMode = 125, ZOrderChange = 126, HoverEnter = 127, HoverLeave = 128, HoverMove = 129, AccessibilityHelp = 119, AccessibilityDescription = 130, AcceptDropsChange = 152, MenubarUpdated = 153, ZeroTimerEvent = 154, GraphicsSceneMouseMove = 155, GraphicsSceneMousePress = 156, GraphicsSceneMouseRelease = 157, GraphicsSceneMouseDoubleClick = 158, GraphicsSceneContextMenu = 159, GraphicsSceneHoverEnter = 160, GraphicsSceneHoverMove = 161, GraphicsSceneHoverLeave = 162, GraphicsSceneHelp = 163, GraphicsSceneDragEnter = 164, GraphicsSceneDragMove = 165, GraphicsSceneDragLeave = 166, GraphicsSceneDrop = 167, GraphicsSceneWheel = 168, KeyboardLayoutChange = 169, DynamicPropertyChange = 170, TabletEnterProximity = 171, TabletLeaveProximity = 172, NonClientAreaMouseMove = 173, NonClientAreaMouseButtonPress = 174, NonClientAreaMouseButtonRelease = 175, NonClientAreaMouseButtonDblClick = 176, MacSizeChange = 177, ContentsRectChange = 178, MacGLWindowChange = 179, FutureCallOut = 180, GraphicsSceneResize = 181, GraphicsSceneMove = 182, CursorChange = 183, ToolTipChange = 184, NetworkReplyUpdated = 185, GrabMouse = 186, UngrabMouse = 187, GrabKeyboard = 188, UngrabKeyboard = 189, MacGLClearDrawable = 191, StateMachineSignal = 192, StateMachineWrapped = 193, TouchBegin = 194, TouchUpdate = 195, TouchEnd = 196, NativeGesture = 197, RequestSoftwareInputPanel = 199, CloseSoftwareInputPanel = 200, UpdateSoftKeys = 201, WinIdChange = 203, Gesture = 198, GestureOverride = 202, PlatformPanel = 212, User = 1000, MaxUser = 65535 }
	This enum type defines the valid event types in Qt. More...

Static Public Functions inherited from QEvent
static int	registerEventType (int hint=-1)
	Registers and returns a custom event type. More...

Detailed Description

The QPaintEvent class contains event parameters for paint events.

Paint events are sent to widgets that need to update themselves, for instance when part of a widget is exposed because a covering widget was moved.

The event contains a region() that needs to be updated, and a rect() that is the bounding rectangle of that region. Both are provided because many widgets can't make much use of region(), and rect() can be much faster than region().boundingRect().

Automatic Clipping

Painting is clipped to region() during the processing of a paint event. This clipping is performed by Qt's paint system and is independent of any clipping that may be applied to a QPainter used to draw on the paint device.

As a result, the value returned by QPainter::clipRegion() on a newly-constructed QPainter will not reflect the clip region that is used by the paint system.