QEvent¶
The QEvent
class is the base class of all event classes. Event objects contain event parameters. More…
Inherited by: QGraphicsSceneEvent, QGraphicsSceneWheelEvent, QGraphicsSceneResizeEvent, QGraphicsSceneMoveEvent, QGraphicsSceneMouseEvent, QGraphicsSceneHoverEvent, QGraphicsSceneHelpEvent, QGraphicsSceneDragDropEvent, QGraphicsSceneContextMenuEvent, QGestureEvent, WrappedEvent, SignalEvent, QWindowStateChangeEvent, QWhatsThisClickedEvent, QToolBarChangeEvent, QStatusTipEvent, QShowEvent, QShortcutEvent, QScrollPrepareEvent, QScrollEvent, QResizeEvent, QPlatformSurfaceEvent, QPaintEvent, QMoveEvent, QInputMethodQueryEvent, QInputMethodEvent, QInputEvent, QPointerEvent, QTouchEvent, QSinglePointEvent, QWheelEvent, QTabletEvent, QNativeGestureEvent, QMouseEvent, QHoverEvent, QEnterEvent, QKeyEvent, QContextMenuEvent, QIconDragEvent, QHideEvent, QHelpEvent, QFocusEvent, QFileOpenEvent, QExposeEvent, QDropEvent, QDragMoveEvent, QDragEnterEvent, QDragLeaveEvent, QCloseEvent, QActionEvent, QTimerEvent, QDynamicPropertyChangeEvent, QChildEvent
Synopsis¶
Functions¶
def
__repr__
()def
accept
()def
ignore
()def
isAccepted
()def
isInputEvent
()def
isPointerEvent
()def
isSinglePointEvent
()def
spontaneous
()def
type
()
Virtual functions¶
def
clone
()def
setAccepted
(accepted)
Static functions¶
def
registerEventType
([hint=-1])
Detailed Description¶
Qt’s main event loop ( 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 sendEvent()
and postEvent()
( spontaneous()
returns false
).
QObjects
receive events by having their event()
function called. The function can be reimplemented in subclasses to customize event handling and add additional event types; event()
is a notable example. By default, events are dispatched to event handlers like timerEvent()
and mouseMoveEvent()
. 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.
- class PySide6.QtCore.QEvent(type)¶
PySide6.QtCore.QEvent(arg__1)
- Parameters
type –
Type
arg__1 –
PySide6.QtCore.QEvent
Constructs an event object of type type
.
Constructs an event object of type type
.
- PySide6.QtCore.QEvent.Type¶
This enum type defines the valid event types in Qt. The event types and the specialized classes for each type are as follows:
Constant
Description
QEvent.None
Not an event.
QEvent.ActionAdded
A new action has been added (
QActionEvent
).QEvent.ActionChanged
An action has been changed (
QActionEvent
).QEvent.ActionRemoved
An action has been removed (
QActionEvent
).QEvent.ActivationChange
A widget’s top-level window activation state has changed.
QEvent.ApplicationActivate
This enum has been deprecated. Use instead.
QEvent.ApplicationActivated
This enum has been deprecated. Use instead.
QEvent.ApplicationDeactivate
This enum has been deprecated. Use instead.
QEvent.ApplicationFontChange
The default application font has changed.
QEvent.ApplicationLayoutDirectionChange
The default application layout direction has changed.
QEvent.ApplicationPaletteChange
The default application palette has changed.
QEvent.ApplicationStateChange
The state of the application has changed.
QEvent.ApplicationWindowIconChange
The application’s icon has changed.
QEvent.ChildAdded
An object gets a child (
QChildEvent
).QEvent.ChildPolished
A widget child gets polished (
QChildEvent
).QEvent.ChildRemoved
An object loses a child (
QChildEvent
).QEvent.Clipboard
The clipboard contents have changed.
QEvent.Close
Widget was closed (
QCloseEvent
).QEvent.CloseSoftwareInputPanel
A widget wants to close the software input panel (SIP).
QEvent.ContentsRectChange
The margins of the widget’s content rect changed.
QEvent.ContextMenu
Context popup menu (
QContextMenuEvent
).QEvent.CursorChange
The widget’s cursor has changed.
QEvent.DeferredDelete
The object will be deleted after it has cleaned up ()
QEvent.DragEnter
The cursor enters a widget during a drag and drop operation (
QDragEnterEvent
).QEvent.DragLeave
The cursor leaves a widget during a drag and drop operation (
QDragLeaveEvent
).QEvent.DragMove
A drag and drop operation is in progress (
QDragMoveEvent
).QEvent.Drop
A drag and drop operation is completed (
QDropEvent
).QEvent.DynamicPropertyChange
A dynamic property was added, changed, or removed from the object.
QEvent.EnabledChange
Widget’s enabled state has changed.
QEvent.Enter
Mouse enters widget’s boundaries (
QEnterEvent
).QEvent.EnterEditFocus
An editor widget gains focus for editing.
QT_KEYPAD_NAVIGATION
must be defined.QEvent.EnterWhatsThisMode
Send to toplevel widgets when the application enters “What’s This?” mode.
QEvent.Expose
Sent to a window when its on-screen contents are invalidated and need to be flushed from the backing store.
QEvent.FileOpen
File open request (
QFileOpenEvent
).QEvent.FocusIn
Widget or Window gains keyboard focus (
QFocusEvent
).QEvent.FocusOut
Widget or Window loses keyboard focus (
QFocusEvent
).QEvent.FocusAboutToChange
Widget or Window focus is about to change (
QFocusEvent
)QEvent.FontChange
Widget’s font has changed.
QEvent.Gesture
A gesture was triggered (
QGestureEvent
).QEvent.GestureOverride
A gesture override was triggered (
QGestureEvent
).QEvent.GrabKeyboard
Item gains keyboard grab (
QGraphicsItem
only).QEvent.GrabMouse
Item gains mouse grab (
QGraphicsItem
only).QEvent.GraphicsSceneContextMenu
Context popup menu over a graphics scene (
QGraphicsSceneContextMenuEvent
).QEvent.GraphicsSceneDragEnter
The cursor enters a graphics scene during a drag and drop operation (
QGraphicsSceneDragDropEvent
).QEvent.GraphicsSceneDragLeave
The cursor leaves a graphics scene during a drag and drop operation (
QGraphicsSceneDragDropEvent
).QEvent.GraphicsSceneDragMove
A drag and drop operation is in progress over a scene (
QGraphicsSceneDragDropEvent
).QEvent.GraphicsSceneDrop
A drag and drop operation is completed over a scene (
QGraphicsSceneDragDropEvent
).QEvent.GraphicsSceneHelp
The user requests help for a graphics scene (
QHelpEvent
).QEvent.GraphicsSceneHoverEnter
The mouse cursor enters a hover item in a graphics scene (
QGraphicsSceneHoverEvent
).QEvent.GraphicsSceneHoverLeave
The mouse cursor leaves a hover item in a graphics scene (
QGraphicsSceneHoverEvent
).QEvent.GraphicsSceneHoverMove
The mouse cursor moves inside a hover item in a graphics scene (
QGraphicsSceneHoverEvent
).QEvent.GraphicsSceneMouseDoubleClick
Mouse press again (double click) in a graphics scene (
QGraphicsSceneMouseEvent
).QEvent.GraphicsSceneMouseMove
Move mouse in a graphics scene (
QGraphicsSceneMouseEvent
).QEvent.GraphicsSceneMousePress
Mouse press in a graphics scene (
QGraphicsSceneMouseEvent
).QEvent.GraphicsSceneMouseRelease
Mouse release in a graphics scene (
QGraphicsSceneMouseEvent
).QEvent.GraphicsSceneMove
Widget was moved (
QGraphicsSceneMoveEvent
).QEvent.GraphicsSceneResize
Widget was resized (
QGraphicsSceneResizeEvent
).QEvent.GraphicsSceneWheel
Mouse wheel rolled in a graphics scene (
QGraphicsSceneWheelEvent
).QEvent.GraphicsSceneLeave
The cursor leaves a graphics scene (
QGraphicsSceneWheelEvent
).QEvent.Hide
Widget was hidden (
QHideEvent
).QEvent.HideToParent
A child widget has been hidden.
QEvent.HoverEnter
The mouse cursor enters a hover widget (
QHoverEvent
).QEvent.HoverLeave
The mouse cursor leaves a hover widget (
QHoverEvent
).QEvent.HoverMove
The mouse cursor moves inside a hover widget (
QHoverEvent
).QEvent.IconDrag
The main icon of a window has been dragged away (
QIconDragEvent
).QEvent.IconTextChange
Widget’s icon text has been changed. (Deprecated)
QEvent.InputMethod
An input method is being used (
QInputMethodEvent
).QEvent.InputMethodQuery
A input method query event (
QInputMethodQueryEvent
)QEvent.KeyboardLayoutChange
The keyboard layout has changed.
QEvent.KeyPress
Key press (
QKeyEvent
).QEvent.KeyRelease
Key release (
QKeyEvent
).QEvent.LanguageChange
The application translation changed.
QEvent.LayoutDirectionChange
The direction of layouts changed.
QEvent.LayoutRequest
Widget layout needs to be redone.
QEvent.Leave
Mouse leaves widget’s boundaries.
QEvent.LeaveEditFocus
An editor widget loses focus for editing. QT_KEYPAD_NAVIGATION must be defined.
QEvent.LeaveWhatsThisMode
Send to toplevel widgets when the application leaves “What’s This?” mode.
QEvent.LocaleChange
The system locale has changed.
QEvent.NonClientAreaMouseButtonDblClick
A mouse double click occurred outside the client area (
QMouseEvent
).QEvent.NonClientAreaMouseButtonPress
A mouse button press occurred outside the client area (
QMouseEvent
).QEvent.NonClientAreaMouseButtonRelease
A mouse button release occurred outside the client area (
QMouseEvent
).QEvent.NonClientAreaMouseMove
A mouse move occurred outside the client area (
QMouseEvent
).QEvent.MacSizeChange
The user changed his widget sizes (macOS only).
QEvent.MetaCall
An asynchronous method invocation via
invokeMethod()
.QEvent.ModifiedChange
Widgets modification state has been changed.
QEvent.MouseButtonDblClick
Mouse press again (
QMouseEvent
).QEvent.MouseButtonPress
Mouse press (
QMouseEvent
).QEvent.MouseButtonRelease
Mouse release (
QMouseEvent
).QEvent.MouseMove
Mouse move (
QMouseEvent
).QEvent.MouseTrackingChange
The mouse tracking state has changed.
QEvent.Move
Widget’s position changed (
QMoveEvent
).QEvent.NativeGesture
The system has detected a gesture (
QNativeGestureEvent
).QEvent.OrientationChange
The screens orientation has changes ().
QEvent.Paint
Screen update necessary (
QPaintEvent
).QEvent.PaletteChange
Palette of the widget changed.
QEvent.ParentAboutToChange
The widget parent is about to change.
QEvent.ParentChange
The widget parent has changed.
QEvent.PlatformPanel
A platform specific panel has been requested.
QEvent.PlatformSurface
A native platform surface has been created or is about to be destroyed (
QPlatformSurfaceEvent
).QEvent.Polish
The widget is polished.
QEvent.PolishRequest
The widget should be polished.
QEvent.QueryWhatsThis
The widget should accept the event if it has “What’s This?” help (
QHelpEvent
).QEvent.ReadOnlyChange
Widget’s read-only state has changed (since Qt 5.4).
QEvent.RequestSoftwareInputPanel
A widget wants to open a software input panel (SIP).
QEvent.Resize
Widget’s size changed (
QResizeEvent
).QEvent.ScrollPrepare
The object needs to fill in its geometry information (
QScrollPrepareEvent
).QEvent.Scroll
The object needs to scroll to the supplied position (
QScrollEvent
).QEvent.Shortcut
Key press in child for shortcut key handling (
QShortcutEvent
).QEvent.ShortcutOverride
Key press in child, for overriding shortcut key handling (
QKeyEvent
). When a shortcut is about to trigger,ShortcutOverride
is sent to the active window. This allows clients (e.g. widgets) to signal that they will handle the shortcut themselves, by accepting the event. If the shortcut override is accepted, the event is delivered as a normal key press to the focus widget. Otherwise, it triggers the shortcut action, if one exists.QEvent.Show
Widget was shown on screen (
QShowEvent
).QEvent.ShowToParent
A child widget has been shown.
QEvent.SockAct
Socket activated, used to implement
QSocketNotifier
.QEvent.StateMachineSignal
A signal delivered to a state machine (QStateMachine::SignalEvent).
QEvent.StateMachineWrapped
The event is a wrapper for, i.e., contains, another event (QStateMachine::WrappedEvent).
QEvent.StatusTip
A status tip is requested (
QStatusTipEvent
).QEvent.StyleChange
Widget’s style has been changed.
QEvent.TabletMove
Wacom tablet move (
QTabletEvent
).QEvent.TabletPress
Wacom tablet press (
QTabletEvent
).QEvent.TabletRelease
Wacom tablet release (
QTabletEvent
).QEvent.TabletEnterProximity
Wacom tablet enter proximity event (
QTabletEvent
), sent toQApplication
.QEvent.TabletLeaveProximity
Wacom tablet leave proximity event (
QTabletEvent
), sent toQApplication
.QEvent.TabletTrackingChange
The Wacom tablet tracking state has changed (since Qt 5.9).
QEvent.ThreadChange
The object is moved to another thread. This is the last event sent to this object in the previous thread. See
moveToThread()
.QEvent.Timer
Regular timer events (
QTimerEvent
).QEvent.ToolBarChange
The toolbar button is toggled on macOS.
QEvent.ToolTip
A tooltip was requested (
QHelpEvent
).QEvent.ToolTipChange
The widget’s tooltip has changed.
QEvent.TouchBegin
Beginning of a sequence of touch-screen or track-pad events (
QTouchEvent
).QEvent.TouchCancel
Cancellation of touch-event sequence (
QTouchEvent
).QEvent.TouchEnd
End of touch-event sequence (
QTouchEvent
).QEvent.TouchUpdate
Touch-screen event (
QTouchEvent
).QEvent.UngrabKeyboard
Item loses keyboard grab (
QGraphicsItem
only).QEvent.UngrabMouse
Item loses mouse grab (
QGraphicsItem
,QQuickItem
).QEvent.UpdateLater
The widget should be queued to be repainted at a later time.
QEvent.UpdateRequest
The widget should be repainted.
QEvent.WhatsThis
The widget should reveal “What’s This?” help (
QHelpEvent
).QEvent.WhatsThisClicked
A link in a widget’s “What’s This?” help was clicked.
QEvent.Wheel
Mouse wheel rolled (
QWheelEvent
).QEvent.WinEventAct
A Windows-specific activation event has occurred.
QEvent.WindowActivate
Window was activated.
QEvent.WindowBlocked
The window is blocked by a modal dialog.
QEvent.WindowDeactivate
Window was deactivated.
QEvent.WindowIconChange
The window’s icon has changed.
QEvent.WindowStateChange
The
window's state
(minimized, maximized or full-screen) has changed (QWindowStateChangeEvent
).QEvent.WindowTitleChange
The window title has changed.
QEvent.WindowUnblocked
The window is unblocked after a modal dialog exited.
QEvent.WinIdChange
The window system identifier for this native widget has changed.
QEvent.ZOrderChange
The widget’s z-order has changed. This event is never sent to top level windows.
User events should have values between User
and MaxUser
:
Constant
Description
QEvent.User
User-defined event.
QEvent.MaxUser
Last user event ID.
For convenience, you can use the registerEventType()
function to register and reserve a custom event type for your application. Doing so will allow you to avoid accidentally re-using a custom event type already in use elsewhere in your application.
- PySide6.QtCore.QEvent.__repr__()¶
- Return type
object
- PySide6.QtCore.QEvent.accept()¶
Sets the accept flag of the event object, the equivalent of calling setAccepted
(true).
Setting the accept parameter indicates that the event receiver wants the event. Unwanted events might be propagated to the parent widget.
See also
- PySide6.QtCore.QEvent.clone()¶
- Return type
Creates and returns an identical copy of this event.
- PySide6.QtCore.QEvent.ignore()¶
Clears the accept flag parameter of the event object, the equivalent of calling setAccepted
(false).
Clearing the accept parameter indicates that the event receiver does not want the event. Unwanted events might be propagated to the parent widget.
See also
- PySide6.QtCore.QEvent.isAccepted()¶
- Return type
bool
- PySide6.QtCore.QEvent.isInputEvent()¶
- Return type
bool
Returns true
if the event object is a QInputEvent
or one of its subclasses.
- PySide6.QtCore.QEvent.isPointerEvent()¶
- Return type
bool
Returns true
if the event object is a QPointerEvent
or one of its subclasses.
- PySide6.QtCore.QEvent.isSinglePointEvent()¶
- Return type
bool
Returns true
if the event object is a subclass of QSinglePointEvent
.
- static PySide6.QtCore.QEvent.registerEventType([hint=-1])¶
- Parameters
hint – int
- Return type
int
Registers and returns a custom event type. The hint
provided will be used if it is available, otherwise it will return a value between User
and MaxUser
that has not yet been registered. The hint
is ignored if its value is not between User
and MaxUser
.
Returns -1 if all available values are already taken or the program is shutting down.
- PySide6.QtCore.QEvent.setAccepted(accepted)¶
- Parameters
accepted – bool
See also
- PySide6.QtCore.QEvent.spontaneous()¶
- Return type
bool
Returns true
if the event originated outside the application (a system event); otherwise returns false
.
Returns the event type.
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