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QEvent Class Reference

Inheritance diagram for QEvent:

QAccessibleEvent QActionEvent QChildEvent QClipboardEvent QCloseEvent QDragLeaveEvent QDropEvent QDynamicPropertyChangeEvent QFileOpenEvent QFocusEvent QGraphicsSceneEvent QHelpEvent QHideEvent QHoverEvent QIconDragEvent QInputEvent QInputMethodEvent QMoveEvent QPaintEvent QResizeEvent QShortcutEvent QShowEvent QStatusTipEvent QTimerEvent QToolBarChangeEvent QWhatsThisClickedEvent QWindowStateChangeEvent

List of all members.


Detailed Description

The QEvent class is the base class of all event classes. Event objects contain event parameters.

Qt's main event loop (QCoreApplication::exec()) fetches native window system events from the event queue, translates them into QEvents, and sends the translated events to {QObject}s.

In general, events come from the underlying window system (spontaneous() returns true), but it is also possible to manually send events using QCoreApplication::sendEvent() and QCoreApplication::postEvent() (spontaneous() returns false).

QObjects receive events by having their QObject::event() function called. The function can be reimplemented in subclasses to customize event handling and add additional event types; QWidget::event() is a notable example. By default, events are dispatched to event handlers like QObject::timerEvent() and QWidget::mouseMoveEvent(). QObject::installEventFilter() allows an object to intercept events destined for another object.

The basic QEvent contains only an event type parameter and an "accept" flag. The accept flag set with accept(), and cleared with ignore(). It is set by default, but don't rely on this as subclasses may choose to clear it in their constructor.

Subclasses of QEvent contain additional parameters that describe the particular event.

See also:
QObject::event(), QObject::installEventFilter(), QWidget::event(), QCoreApplication::sendEvent(), QCoreApplication::postEvent(), QCoreApplication::processEvents()

Definition at line 35 of file qcoreevent.h.


Public Types

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, ApplicationActivated = 121, ApplicationDeactivated = 122, 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, User = 1000, MaxUser = 65535
}

Public Member Functions

void accept ()
void ignore ()
bool isAccepted () const
 QEvent (Type type)
void setAccepted (bool accepted)
bool spontaneous () const
Type type () const
virtual ~QEvent ()

Protected Attributes

QEventPrivate * d
ushort t

Private Attributes

ushort m_accept: 1
ushort posted: 1
ushort reserved: 13
ushort spont: 1

Friends

class Q3AccelManager
class QApplication
class QApplicationPrivate
class QCoreApplication
class QCoreApplicationPrivate
class QETWidget
class QShortcutMap
class QThreadData

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

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