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QtGui.QGraphicsSceneEvent Class Reference

The QGraphicsSceneEvent class provides a base class for all graphics view related events. More...

Inheritance diagram for QtGui.QGraphicsSceneEvent:
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Public Member Functions

 QGraphicsSceneEvent (QEvent.Type type)
 
override void CreateProxy ()
 
new void Dispose ()
 
- Public Member Functions inherited from QtCore.QEvent
 QEvent (QEvent copy)
 
 
 QEvent (QEvent.Type type)
 
 
new void Accept ()
 
 
new void Ignore ()
 
 
new bool IsAccepted ()
 
new void SetAccepted (bool accepted)
 
new bool Spontaneous ()
 
 
new QEvent.Type type ()
 
 
new void Dispose ()
 

Protected Member Functions

 QGraphicsSceneEvent (System.Type dummy)
 
- Protected Member Functions inherited from QtCore.QEvent
 QEvent (System.Type dummy)
 

Properties

new QWidget Widget [get, set]
 
 
- Properties inherited from QtCore.QEvent
virtual System.IntPtr SmokeObject [get, set]
 
new ushort T [get, set]
 
static new QMetaObject StaticMetaObject [get]
 

Additional Inherited Members

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

Detailed Description

The QGraphicsSceneEvent class provides a base class for all graphics view related events.

When a QGraphicsView receives Qt mouse, keyboard, and drag and drop events (QMouseEvent, QKeyEvent, QDragEvent, etc.), it translates them into instances of QGraphicsSceneEvent subclasses and forwards them to the QGraphicsScene it displays. The scene then forwards the events to the relevant items.

For example, when a QGraphicsView receives a QMouseEvent of type MousePress as a response to a user click, the view sends a QGraphicsSceneMouseEvent of type GraphicsSceneMousePress to the underlying QGraphicsScene through its mousePressEvent() function. The default QGraphicsScene::mousePressEvent() implementation determines which item was clicked and forwards the event to QGraphicsItem::mousePressEvent().

Subclasses such as QGraphicsSceneMouseEvent and QGraphicsSceneContextMenuEvent provide the coordinates from the original QEvent in screen, scene, and item coordinates (see screenPos(), scenePos(), and pos()). The item coordinates are set by the QGraphicsScene before it forwards the event to the event to a QGraphicsItem. The mouse events also add the possibility to retrieve the coordinates from the last event received by the view (see lastScreenPos(), lastScenePos(), and lastPos()).

See also QEvent.

Constructor & Destructor Documentation

QtGui.QGraphicsSceneEvent.QGraphicsSceneEvent ( System.Type  dummy)
protected
QtGui.QGraphicsSceneEvent.QGraphicsSceneEvent ( QEvent.Type  type)

Member Function Documentation

override void QtGui.QGraphicsSceneEvent.CreateProxy ( )
virtual

Reimplemented from QtCore.QEvent.

Reimplemented in QtGui.QGraphicsSceneWheelEvent, QtGui.QGraphicsSceneResizeEvent, QtGui.QGraphicsSceneMoveEvent, QtGui.QGraphicsSceneMouseEvent, QtGui.QGraphicsSceneHoverEvent, and QtGui.QGraphicsSceneHelpEvent.

new void QtGui.QGraphicsSceneEvent.Dispose ( )

Property Documentation

new QWidget QtGui.QGraphicsSceneEvent.Widget
getset

Returns the widget where the event originated, or 0 if the event originates from another application.