Typedef for QFlags<GraphicsItemFlag> which contains an OR combination of GraphicsItemFlag values.

Refer to QGraphicsItem::GraphicsItemFlag for the enum documentation.

This enum describes QGraphicsItem's cache modes. Caching is used to speed up rendering by allocating and rendering to an off-screen pixel buffer, which can be reused when the item requires redrawing. For some paint devices, the cache is stored directly in graphics memory, which makes rendering efficient.

See also

QGraphicsItem::setCacheMode()

This enum describes the state changes that are notified by QGraphicsItem::itemChange(). The notifications are sent as the state changes, and in some cases, adjustments can be made. Be cautious when calling methods inside itemChange(). Certain methods can cause unwanted recursion. For example, you can not call setPos() in itemChange() on an ItemPositionChange notification, as the setPos() method will then call itemChange(ItemPositionChange). Instead, return the new, adjusted position from itemChange().

This enum describes different flags which can be used to enable or disable features for a given item. All flags are disabled by default.

This enum specifies the behavior of a modal panel which is a panel that blocks input to other panels.

See also

QGraphicsItem::setPanelModality(), QGraphicsItem::panelModality(), GraphicsItemFlag::ItemIsPanel

Constructs a QGraphicsItem with the given parent item. If the parent is a nullptr the graphic item can be added to a scene by calling QGraphicsScene::addItem(). The graphic item will then become a top level item.

See also

QGraphicsScene::addItem(), setParentItem()

Destroys the QGraphicsItem and all its children. If this QGraphicsItem is currently associated with a scene, the item will be removed from the scene before it is deleted.

Returns true if this QGraphicsItem can accept drag and drop events, otherwise returns false. By default items do not accept drag and drop events.

See also

setAcceptDrops()

Returns the mouse buttons this QGraphicsItem can accept mouse events for. By default all mouse buttons are accepted. Mouse events are delivered to the first or top item in the Z order which accepts the mouse button.

See also

setAcceptedMouseButtons(), mousePressEvent()

Returns true if an item accepts hover events (QGraphicsSceneHoverEvent), otherwise returns false. By default items do not accept hover events.

See also

setAcceptHoverEvents(), setAcceptedMouseButtons()

Returns true if an item accepts touch events, otherwise returns false. By default items do not accept touch events.

See also

setAcceptTouchEvents()

This method is called twice for all items by the QGraphicsScene::advance() slot. In the first phase all items are called with phase equal to 0, indicating that items on the scene are about to advance. Then all items are called with phase equal to 1.

Reimplement this method to update your item if you need simple scene-controlled animation. The default implementation does nothing.

For individual item animation, an alternative to this method is to either use QGraphicsItemAnimation, or to multiple-inherit from QObject and QGraphicsItem, and animate your item using QObject::startTimer() and QObject::timerEvent().

See also

QGraphicsItemAnimation, QTimeLine

This method defines the outer bounds of the item as a rectangle. All painting must occur within the item's bounding rectangle. QGraphicsView uses this to determine when the item requires redrawing. Although the item's shape can be arbitrary, the bounding area is always a rectangle, and it is unaffected by the item's transformation.

Before changing the item's bounding rectangle, you must first call prepareGeometryChange(). This notifies the scene of the pending change, so the geometry index can be updated.

For shapes with an outline it is important to include half the pen width in the bounding rectangle. It is not necessary to compensate for antialiasing.

See also

boundingRegion(), shape(), contains(), The Graphics View Coordinate System, prepareGeometryChange()

Implemented in QGraphicsItemGroup::boundingRect(), QGraphicsSimpleTextItem::boundingRect(), QGraphicsTextItem::boundingRect(), QGraphicsPixmapItem::boundingRect(), QGraphicsLineItem::boundingRect(), QGraphicsPolygonItem::boundingRect(), QGraphicsEllipseItem::boundingRect(), QGraphicsRectItem::boundingRect(), QGraphicsPathItem::boundingRect(), QGraphicsSvgItem::boundingRect()

Returns the bounding region for this item. The value for itemToDeviceTransform is the transformation from item coordinates to device coordinates. If you pass an identity QTransform as a parameter this method will return a local coordinate region.

If you want this method to return a QRegion in scene coordinates, pass the return value of sceneTransform() as the itemToDeviceTransform argument.

The bounding region describes a coarse outline of the item's visual contents. The bounding region is more complex and more expensive to use than the bounding rectangle however the bounding region is more precise.

You can tune the granularity for the bounding region by first calling setBoundingRegionGranularity(). The default granularity is 0 which means the item's bounding region is the same as its bounding rectangle.

See also

boundingRegionGranularity()

Returns the item's bounding region granularity which is a value between 0 and 1. The default value is 0 which is the lowest granularity and means the bounding region corresponds to the item's bounding rectangle.

See also

setBoundingRegionGranularity()

Returns the cache mode for this item. The default mode is NoCache which means the cache is disabled and all painting is immediate.

See also

setCacheMode()

Returns a list of this item's children. The items are sorted by stacking order. This takes into account both the item's insertion order and their Z values.

See also

setParentItem(), zValue(), Sorting

Returns the bounding rectangle of this item's descendants in local coordinates. If the item has no children, this method returns an empty QRectF.

This return value does not include the bounding rectangle for the current item, only its children. If you need to include the current item's bounding rectangle then add boundingRect() to childrenBoundingRect() using QRectF::operator|().

This method is linear in complexity, it determines the size of the returned bounding rectangle by iterating through all descendants.

See also

boundingRect(), sceneBoundingRect()

Removes keyboard input focus from the current item. If the item had focus then a focus out event will be sent. Only items that set the QGraphicsItem::ItemIsFocusable flag or widgets that set an appropriate focus policy, can accept keyboard focus.

See also

setFocus(), hasFocus(), QGraphicsWidget::focusPolicy

Returns the clip path for this item or an empty QPainterPath if this item is not clipped. The clip path constrains the item's appearance and interaction. The item can not draw outside the clip path and events outside the clip path will not be delivered to the item.

Enable clipping by setting the ItemClipsToShape or ItemClipsChildrenToShape flags. The item's clip path is calculated by intersecting all clipping ancestors' shapes. If the item sets ItemClipsToShape, the final clip is intersected with the item's own shape.

Clipping introduces a performance penalty. Avoid using clipping whenever possible.

See also

isClipped(), shape(), setFlags()

Returns true if this item collides with graphicsItem, otherwise returns false. The mode is applied to graphicsItem and the resulting shape or bounding rectangle is then compared to this item's shape. The default value for mode is Qt::IntersectsItemShape which means a collision occurs when the shape of graphicsItem intersects, contains, or is contained by this item's shape.

The default implementation is based on shape intersection. The process of shape intersection is expensive when the shapes are complex. You have the option of reimplementing this method in a subclass of QGraphicsItem to provide a custom algorithm. This allows you to make use of natural constraints in the shapes of your own items, in order to improve the performance of the collision detection. For instance, the collision of two untransformed perfectly circular items can be determined very efficiently by comparing their positions and radii.

When reimplementing this method and calling shape() or boundingRect() on the graphicsItem parameter, the returned coordinates must be mapped to this item's coordinate system before any intersection can take place.

See also

contains(), shape()

Returns true if this item collides with path. The collision is determined by mode. The default value for mode is Qt::IntersectsItemShape which means the path collides with this item if it either intersects, contains, or is contained by this item's shape.

This method checks whether the item's shape or bounding rectangle (depending on mode) is contained within path and not whether path is contained within the items shape or bounding rectangle.

See also

collidesWithItem(), contains(), shape()

Returns a list of all items in the current scene which collide with this QGraphicsItem. Every item shape or bounding rectangle is compared to the current QGraphicsItem.

Collisions are determined based on the given mode. The default value for mode is Qt::IntersectsItemShape.

See also

collidesWithItem()

Returns the closest common parent of this QGraphicsItem and graphicsItem. If graphicsItem is a nullptr or there is no common parent, the return value is a nullptr.

See also

isAncestorOf()

Returns true if this item contains point, which is in local coordinates, otherwise false is returned. It is most often called from QGraphicsView to determine what item is under the cursor, and for that reason, the implementation of this method should be as light-weight as possible.

By default this method calls shape(). You can override this method in a subclass to provide a implementation.

See also

shape(), boundingRect(), collidesWithPath()

Reimplemented in QGraphicsSimpleTextItem::contains(), QGraphicsTextItem::contains(), QGraphicsPixmapItem::contains(), QGraphicsLineItem::contains(), QGraphicsPolygonItem::contains(), QGraphicsEllipseItem::contains(), QGraphicsRectItem::contains(), QGraphicsPathItem::contains()

The event handler for event can be reimplemented in a subclass to process context menu events. The event parameter contains details about the event to be handled. If you ignore the event, (i.e., by calling QEvent::ignore(),) event will propagate to any item beneath this item. If no items accept the event, it will be ignored by the scene, and propagate to the view.

The default implementation ignores the event.

It is common to open a QMenu in response to receiving a context menu event.

See also

sceneEvent()

Reimplemented in QGraphicsTextItem::contextMenuEvent()

Returns the current cursor shape for this item.

See also

setCursor(), hasCursor(), unsetCursor(), QWidget::cursor, QApplication::overrideCursor()

Returns the custom data for the given key in this QGraphicsItem as a QVariant. Custom item data is useful for storing arbitrary properties in any item.

See also

setData()

Returns this item's device transformation matrix using viewportTransform to map from scene to device coordinates. This matrix can be used to map coordinates and geometrical shapes from this item's local coordinate system to the viewport's (or any device's) coordinate system. To map coordinates from the viewport, you must first invert the returned matrix.

This method is the same as combining this item's scene transform with the view's viewport transform, but it also understands the ItemIgnoresTransformations flag. The device transform can be used to do accurate coordinate mapping (and collision detection) for untransformable items.

See also

transform(), setTransform(), scenePos(), The Graphics View Coordinate System, itemTransform()

The event handler for event can be reimplemented to receive drag enter events for this item. Drag enter events are generated as the cursor enters the item's area.

By accepting the event the item will accept drop events, in addition to receiving drag move and drag leave. Otherwise, the event will be ignored and propagate to the item beneath. If the event is accepted, the item will receive a drag move event before control goes back to the event loop.

Items do not receive drag and drop events by default, to enable this feature, call setAcceptDrops(true). The default implementation does nothing. A common implementation of dragEnterEvent accepts or ignores event depending on the associated mime data in event.

See also

dropEvent(), dragMoveEvent(), dragLeaveEvent()

Reimplemented in QGraphicsTextItem::dragEnterEvent()

The event handler for event can be reimplemented to receive drag leave events for this item. Drag leave events are generated as the cursor leaves the item's area. Most often you will not need to reimplement this method, but it can be useful for resetting state in your item (e.g., highlighting).

Calling QEvent::ignore() or QEvent::accept() on event has no effect. Items do not receive drag and drop events by default, to enable this feature, call setAcceptDrops(true). The default implementation does nothing.

See also

dragEnterEvent(), dropEvent(), dragMoveEvent()

Reimplemented in QGraphicsTextItem::dragLeaveEvent()

The event handler for event can be reimplemented to receive drag move events for this item. Drag move events are generated as the cursor moves around inside the item's area. Most often you will not need to reimplement this method; it is used to indicate that only parts of the item can accept drops.

Calling QEvent::ignore() or QEvent::accept() on event toggles whether or not the item will accept drops at the position from the event. By default event is accepted, indicating that the item allows drops at the specified position.

Items do not receive drag and drop events by default, to enable this feature, call setAcceptDrops(true). The default implementation does nothing.

See also

dropEvent(), dragEnterEvent(), dragLeaveEvent()

Reimplemented in QGraphicsTextItem::dragMoveEvent()

The event handler for event can be reimplemented to receive drop events for this item. Items can only receive drop events if the last drag move event was accepted.

Calling QEvent::ignore() or QEvent::accept() on event has no effect. Items do not receive drag and drop events by default, to enable this feature, call setAcceptDrops(true). The default implementation does nothing.

See also

dragEnterEvent(), dragMoveEvent(), dragLeaveEvent()

Reimplemented in QGraphicsTextItem::dropEvent()

Returns this item's effective opacity which is between 0.0 (transparent) and 1.0 (opaque). This value is a combination of this item's local opacity, and its parent and ancestors opacities. The effective opacity decides how the item is rendered.

See also

opacity(), paint(), setOpacity()

If the current item is part of a scene that is viewed by a QGraphicsView, this method will attempt to scroll the view to ensure that rectF is visible inside the view's viewport. If rectF is a null rectangle (the default), QGraphicsItem will default to the item's bounding rectangle. The values for xmargin and ymargin are the number of pixels the view should use for margins.

If the QGraphicsView is unable to scroll to the specified rectF the contents are scrolled to the nearest valid position. If this item is not viewed by a QGraphicsView, this method does nothing.

See also

QGraphicsView::ensureVisible()

Equivalent to calling ensureVisible(QRectF(x, y, width, height), xmargin, ymargin).

Returns true if this item filters child events, otherwise false is returned. The default value is false and child events are not filtered.

See also

setFiltersChildEvents()

Returns the flags for this item. The flags describe what configurable features of the item are enabled and not. For example, if the flags include QGraphicsItem::ItemIsFocusable, the item can accept input focus. By default no flags are enabled.

See also

setFlags(), setFlag()

The event handler for event can be reimplemented to receive focus in events for this item. The default implementation calls ensureVisible().

See also

focusOutEvent(), sceneEvent(), setFocus()

Reimplemented in QGraphicsTextItem::focusInEvent()

If this item or any of its children currently has input focus, this method will return a pointer to that item. If no descendant has input focus then a nullptr is returned.

See also

hasFocus(), setFocus(), QWidget::focusWidget()

The event handler for event can be reimplemented to receive focus out events for this item. The default implementation does nothing.

See also

focusInEvent(), sceneEvent(), setFocus()

Reimplemented in QGraphicsTextItem::focusOutEvent()

Returns this item's focus proxy or nullptr if this item has no focus proxy.

See also

setFocusProxy(), setFocus(), hasFocus()

Grabs the keyboard input. The item will receive all keyboard input to the scene until one of the following events occurs:

• Item becomes invisible
• Item is removed from the scene
• Item is deleted
• Item calls ungrabKeyboard()
• Another item calls grabKeyboard(), then this item will regain the keyboard grab when the other item calls ungrabKeyboard()

When an item gains the keyboard grab, it receives a QEvent::GrabKeyboard event. When it loses the keyboard grab, it receives a QEvent::UngrabKeyboard event. These events can be used to detect when an item gains or loses the keyboard grab through other means than gaining input focus.

It is almost never necessary to explicitly grab the keyboard input since "grabs and releases" are done automatically as items gain and lose focus. Only visible items can grab keyboard input. Calling grabKeyboard() on an invisible item has no effect.

See also

ungrabKeyboard(), grabMouse(), setFocus()

Grabs the mouse input. This item will receive all mouse events for the scene until any of the following events occurs:

• Item becomes invisible
• Item is removed from the scene/li>
• Item is deleted
• Item calls ungrabMouse()
• Another item calls grabMouse(), then this item will regain the mouse grab when the other item calls ungrabMouse()

When an item gains the mouse grab, it receives a QEvent::GrabMouse event. When it loses the mouse grab, it receives a QEvent::UngrabMouse event. These events can be used to detect when an item gains or loses the mouse grab through other means than receiving mouse button events.

It is almost never necessary to explicitly grab the mouse since "grabs and releases" are done automatically as mouse buttons are pressed and released. Only visible items can grab mouse input. Calling grabMouse() on an invisible item has no effect.

See also

QGraphicsScene::mouseGrabberItem(), ungrabMouse(), grabKeyboard()

Returns a pointer to this item's effect if it has one, otherwise returns a nullptr.

See also

setGraphicsEffect()

Returns a pointer to this item's item group or a nullptr if this item is not member of a group.

See also

setGroup(), QGraphicsItemGroup, QGraphicsScene::createItemGroup()

Deprecated:

Returns true if this item handles child events (i.e., all events intended for any of its children are instead sent to this item), otherwise false is returned.

This property is useful for item groups; it allows one item to handle events on behalf of its children, as opposed to its children handling their events individually.

The default is to return false; children handle their own events. The exception for this is if the item is a QGraphicsItemGroup, then it defaults to return true.

See also

QGraphicsItem::setHandlesChildEvents()

Returns true if this item has a cursor set, otherwise false is returned.

By default, items do not have any cursor set. cursor() will return a standard pointing arrow cursor.

See also

unsetCursor()

Returns true if this item is active and it or its focus proxy has keyboard input focus, otherwise returns false.

See also

focusItem(), setFocus(), QGraphicsScene::setFocusItem(), isActive()

This method is equivalent to calling setVisible(false).

See also

show(), setVisible()

The event handler for event can be reimplemented to receive hover enter events for this item. The default implementation calls update(). Calling QEvent::ignore() or QEvent::accept() on event has no effect.

See also

hoverMoveEvent(), hoverLeaveEvent(), sceneEvent(), setAcceptHoverEvents()

Reimplemented in QGraphicsTextItem::hoverEnterEvent()

The event handler for event can be reimplemented to receive hover leave events for this item. The default implementation calls update(). Calling QEvent::ignore() or QEvent::accept() on event has no effect.

See also

hoverEnterEvent(), hoverMoveEvent(), sceneEvent(), setAcceptHoverEvents()

Reimplemented in QGraphicsTextItem::hoverLeaveEvent()

The event handler for event can be reimplemented to receive hover move events for this item. The default implementation does nothing. Calling QEvent::ignore() or QEvent::accept() on event has no effect.

See also

hoverEnterEvent(), hoverLeaveEvent(), sceneEvent(), setAcceptHoverEvents()

Reimplemented in QGraphicsTextItem::hoverMoveEvent()

The event handler for event can be reimplemented to receive input method events for this item. The default implementation ignores the event.

See also

inputMethodQuery(), sceneEvent()

Reimplemented in QGraphicsTextItem::inputMethodEvent()

Returns the current input method hints of this item.

Input method hints are only relevant for input items. The hints are used by the input method to indicate how it should operate. For example, if the Qt::ImhNumbersOnly flag is set, the input method may change its visual components to reflect that only numbers can be entered.

The effect may vary between input method implementations.

See also

setInputMethodHints(), inputMethodQuery()

This method is only relevant for input items. It is used by the input method to query a set of properties of the item to be able to support complex input method operations, such as support for surrounding text and reconversions. The query parameter specifies which property is queried.

See also

inputMethodEvent(), QInputMethodEvent

Reimplemented in QGraphicsTextItem::inputMethodQuery()

Installs an event filter for this item on filterItem, causing all events for this item to first pass through filterItem's sceneEventFilter() method. An item can only filter events for other items in the same scene. Also, an item can not filter its own events; instead, you can reimplement sceneEvent() directly. Items must belong to a scene for scene event filters to be installed and used.

To filter another item's events, install this QGraphicsItem as the event filter for the other item.

See also

removeSceneEventFilter(), sceneEventFilter(), sceneEvent()

Returns true if this item is active, otherwise returns false. An item can only be active if the scene is active. An item is active if it is, or is a descendant of, an active panel. Items in non-active panels are not active. Items that are not part of a panel follow scene activation when the scene has no active panel. Only active items can gain input focus.

See also

QGraphicsScene::isActive(), QGraphicsScene::activePanel(), panel(), isPanel()

Returns true if this item is the parent of graphicsItem.

See also

parentItem()

Returns true if this item is blocked by a modal panel, false otherwise. If blockingPanel is not a nullptr it will be set to the modal panel that is blocking this item. If this item is not blocked, blockingPanel will not be set by this method. This method always returns false for items not in a scene.

See also

panelModality(), setPanelModality(), PanelModality

Returns true if this item is clipped. An item is clipped if it has either set the ItemClipsToShape flag, or if it or any of its ancestors has set the ItemClipsChildrenToShape flag.

Clipping affects the item's appearance as well as mouse and hover event delivery.

See also

clipPath(), shape(), setFlags()

Returns true if the item is enabled, otherwise false is returned.

See also

setEnabled()

Returns true if rectF is completely obscured by other items.

See also

opaqueArea()

This method is equivalent to calling isObscured(QRectF(x, y, width, height)).

Returns true if the current QGraphicsItem's bounding rectangle is completely obscured by graphicsItem.

The base implementation maps the graphicsItem opaqueArea() to the current QGraphicsItem's coordinate system and then checks if the current boundingRect() is fully contained within the mapped shape. You can reimplement this method to provide a custom algorithm for determining whether the current item is obscured by graphicsItem.

See also

opaqueArea(), isObscured()

Reimplemented in QGraphicsItemGroup::isObscuredBy(), QGraphicsSimpleTextItem::isObscuredBy(), QGraphicsTextItem::isObscuredBy(), QGraphicsPixmapItem::isObscuredBy(), QGraphicsLineItem::isObscuredBy(), QGraphicsPolygonItem::isObscuredBy(), QGraphicsEllipseItem::isObscuredBy(), QGraphicsRectItem::isObscuredBy(), QGraphicsPathItem::isObscuredBy(), QAbstractGraphicsShapeItem::isObscuredBy()

Returns true if the item is a panel, otherwise returns false.

See also

panel(), GraphicsItemFlag::ItemIsPanel

Returns true if this item is selected, otherwise false is returned. Items that are in a group inherit the group's selected state. Items are not selected by default.

See also

setSelected(), QGraphicsScene::setSelectionArea()

Returns true if this item is currently under the mouse cursor in one of the views, otherwise false is returned.

See also

QGraphicsScene::views(), QCursor::pos()

Returns true if the item is visible, otherwise, false is returned. The item's general visibility is unrelated to whether or not it is actually being visualized by a QGraphicsView.

See also

setVisible()

Returns true if the item is visible to graphicsItem, otherwise false is returned. The graphicsItem can be a nullptr in which case this method will return whether the item is visible to the scene or not.

An item may not be visible to its ancestors even if isVisible() is true. It may also be visible to its ancestors even if isVisible() is false. If any ancestor is hidden, the item itself will be implicitly hidden, in which case this method will return false.

See also

isVisible(), setVisible()

Returns true if this item inherits from QGraphicsWidget, otherwise returns false.

Returns true if the item is a QGraphicsWidget window, otherwise returns false.

See also

QGraphicsWidget::windowFlags()

This method is called by QGraphicsItem to notify custom items, the state of the current item is being modified. By overriding this method in your class, custom items can react to the change. The parameter for value will be the new value of the property which is changing.

The default implementation does nothing and returns value. Certain QGraphicsItem methods can not be called when overriding this method. Refer to GraphicsItemChange for additional information.

See also

QGraphicsItem::GraphicsItemChange

Returns a QTransform that maps coordinates from this item to graphicsItem. If ok is not null, and if there is no such transform, the boolean pointed to by ok will be set to false, otherwise it will be set to true.

This transform provides an alternative to the mapToItem() or mapFromItem() methods, by returning the appropriate transform so that you can map shapes and coordinates yourself. It also helps you write more efficient code when repeatedly mapping between the same two items.

Note

In rare circumstances there is no transform that maps between two items.

See also

mapToItem(), mapFromItem(), deviceTransform()

The event handler for event can be reimplemented to receive key press events for this item. The default implementation ignores the event. Key events are only received for items that set the QGraphicsItem::ItemIsFocusable flag and that have keyboard input focus.

See also

keyReleaseEvent(), setFocus(), QGraphicsScene::setFocusItem(), sceneEvent()

Reimplemented in QGraphicsTextItem::keyPressEvent()

The event handler for event can be reimplemented to receive key release events for this item. The default implementation ignores the event. Key events are only received for items that set the QGraphicsItem::ItemIsFocusable flag and that have keyboard input focus.

See also

keyPressEvent(), setFocus(), QGraphicsScene::setFocusItem(), sceneEvent()

Reimplemented in QGraphicsTextItem::keyReleaseEvent()

Maps the path which is in the graphicsItem coordinate system, to the current QGraphicsItem coordinate system. Returns the mapped path. If graphicsItem is a nullptr this method returns the same as mapFromScene().

See also

itemTransform(), mapFromParent(), mapFromScene(), mapToItem(), The Graphics View Coordinate System

Maps the point which is in the graphicsItem coordinate system, to the current QGraphicsItem coordinate system. Returns the mapped coordinate. If graphicsItem is a nullptr this method returns the same as mapFromScene().

See also

itemTransform(), mapFromParent(), mapFromScene(), transform(), mapToItem(), The Graphics View Coordinate System

Maps the polygon which is in the graphicsItem coordinate system, to the current QGraphicsItem coordinate system. Returns the mapped polygon. If graphicsItem is a nullptr this method returns the same as mapFromScene().

See also

itemTransform(), mapToItem(), mapFromParent(), transform(), The Graphics View Coordinate System

Maps the rectF which is in the graphicsItem coordinate system, to the current QGraphicsItem coordinate system. Returns the mapped rectangle as a polygon. If graphicsItem is a nullptr this method returns the same as mapFromScene().

See also

itemTransform(), mapToItem(), mapFromParent(), transform(), The Graphics View Coordinate System

This method is equivalent to calling mapFromItem(graphicsItem, QPointF(x, y)).

This method is equivalent to calling mapFromItem(graphicsItem, QRectF(x, y, width, height)).

Maps the path which is in the parent's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped path.

See also

mapFromScene(), mapFromItem(), mapToParent(), The Graphics View Coordinate System

Maps the point which is in the parent's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped coordinate.

See also

mapFromItem(), mapFromScene(), transform(), mapToParent(), The Graphics View Coordinate System

Maps the polygon which is in the parent's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped polygon.

See also

mapToParent(), mapToItem(), transform(), The Graphics View Coordinate System

Maps the rectf which is in the parent's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped rectangle as a polygon.

See also

mapToParent(), mapFromItem(), transform(), The Graphics View Coordinate System

This method is equivalent to calling mapFromParent(QPointF(x, y)).

This method is equivalent to calling mapFromItem(QRectF(x, y, width, height)).

Maps the path which is in the scene's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped path.

See also

mapFromParent(), mapFromItem(), mapToScene(), The Graphics View Coordinate System

Maps the point which is in the scene's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped coordinate.

See also

mapFromItem(), mapFromParent(), transform(), mapToScene(), The Graphics View Coordinate System

Maps the polygon which is in the scene's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped polygon.

See also

mapToScene(), mapFromParent(), transform(), The Graphics View Coordinate System

Maps the rectF which is in the scene's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped rectangle as a polygon.

See also

mapToScene(), mapFromItem(), transform(), The Graphics View Coordinate System

This method is equivalent to calling mapFromScene(QPointF(x, y)).

This method is equivalent to calling mapFromScene(QRectF(x, y, width, height)).

Maps the rectF which is in the graphicsItem coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped rectangle as a new rectangle.

If graphicsItem is a nullptr this method returns the same as mapRectFromScene().

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

This method is equivalent to calling mapRectFromItem(graphicsItem, QRectF(x, y, width, height)).

Maps the rectF which is in the parent's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped rectangle as a new rectangle.

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

This method is equivalent to calling mapRectFromParent(QRectF(x, y, width, height)).

Maps the rectF which is in the scene's coordinate system, to the current QGraphicsItem coordinate system, and returns the mapped rectangle as a new rectangle.

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

This method is equivalent to calling mapRectFromScene(QRectF(x, y, width, height)).

Maps the rectF which is in the current QGraphicsItem coordinate system, to the graphicsItem coordinate system. Returns the mapped rectangle as a new rectangle. If graphicsItem is a nullptr this method returns the same as mapRectToScene().

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

This method is equivalent to calling mapRectToItem(graphicsItem, QRectF(x, y, width, height)).

Maps the rectF, which is in the current QGraphicsItem coordinate system, to the parent's coordinate system. Returns the mapped rectangle as a new rectangle.

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

This method is equivalent to calling mapRectToParent(QRectF(x, y, width, height)).

Maps the rectF, which is in the current QGraphicsItem coordinate system, to the scene's coordinate system. Returns the mapped rectangle as a new rectangle.

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

This method is equivalent to calling mapRectToScene(QRectF(x, y, width, height)).

Maps the path which is in the current QGraphicsItem coordinate system, to the graphicsItem coordinate system. Returns the mapped path. If graphicsItem is a nullptr this method returns the same as mapToScene().

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

Maps the point which is in the current QGraphicsItem coordinate system, to the graphicsItem coordinate system. Returns the mapped coordinate. If graphicsItem is a nullptr this method returns the same as mapToScene().

See also

itemTransform(), mapToParent(), mapToScene(), transform(), mapFromItem(), The Graphics View Coordinate System

Maps the polygon which is in the current QGraphicsItem coordinate system, to the graphicsItem coordinate system. Returns the mapped polygon. If graphicsItem is a nullptr this method returns the same as mapToScene().

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

Maps the rectF which is in the current QGraphicsItem coordinate system, to the graphicsItem coordinate system. Returns the mapped rectangle as a polygon. If graphicsItem is a nullptr this method returns the same as mapToScene().

See also

itemTransform(), mapToParent(), mapToScene(), mapFromItem(), The Graphics View Coordinate System

This method is equivalent to calling mapToItem(graphicsItem, QPointF(x, y)).

This method is equivalent to calling mapToItem(graphicsItem, QRectF(x, y, width, height)).

Maps the path which is in the current QGraphicsItem coordinate system, to the parent's coordinate system. Returns the mapped path. If the current QGraphicsItem has no parent, then path will be mapped to the scene's coordinate system.

See also

mapToScene(), mapToItem(), mapFromParent(), The Graphics View Coordinate System

Maps the point which is in the current QGraphicsItem coordinate system, to the parent's coordinate system. Returns the mapped coordinate. If the current QGraphicsItem has no parent then point will be mapped to the scene's coordinate system.

See also

mapToItem(), mapToScene(), transform(), mapFromParent(), The Graphics View Coordinate System

Maps the polygon which is in the current QGraphicsItem coordinate system, to the parent's coordinate system. Returns the mapped polygon. If the current QGraphicsItem has no parent then polygon will be mapped to the scene's coordinate system.

See also

mapToScene(), mapToItem(), mapFromParent(), The Graphics View Coordinate System

Maps the rectF which is in the current QGraphicsItem coordinate system, to the parent's coordinate system. Returns the mapped rectangle as a polygon. If the current QGraphicsItem has no parent then rectF will be mapped to the scene's coordinate system.

See also

mapToScene(), mapToItem(), mapFromParent(), The Graphics View Coordinate System

This method is equivalent to calling mapToParent(QPointF(x, y)).

This method is equivalent to calling mapToParent(QRectF(x, y, width, height)).

Maps the path which is in the current QGraphicsItem coordinate system, to the scene's coordinate system. Returns the mapped path.

See also

mapToParent(), mapToItem(), mapFromScene(), The Graphics View Coordinate System

Maps the point which is in the current QGraphicsItem coordinate system, to the scene's coordinate system. Returns the mapped coordinate.

See also

mapToItem(), mapToParent(), transform(), mapFromScene(), The Graphics View Coordinate System

Maps the polygon which is in the current QGraphicsItem coordinate system, to the scene's coordinate system. Returns the mapped polygon.

See also

mapToParent(), mapToItem(), mapFromScene(), The Graphics View Coordinate System

Maps the rectF which is in the current QGraphicsItem coordinate system, to the scene's coordinate system. Returns the mapped rectangle as a polygon.

See also

mapToParent(), mapToItem(), mapFromScene(), The Graphics View Coordinate System

This method is equivalent to calling mapToScene(QPointF(x, y)).

This method is equivalent to calling mapToScene(QRectF(x, y, width, height)).

Deprecated:

Returns the item's affine transformation matrix. This is a subset or the item's full transformation matrix, and might not represent the item's full transformation.

Use transform() instead.

See also

QGraphicsItem::setMatrix(), setTransform(), sceneTransform()

The event handler for event can be reimplemented to receive mouse doubleclick events for this item. When doubleclicking the item will first receive a mouse press event, followed by a release event, then a doubleclick event, and finally a release event. An item will not receive double click events if it is neither selectable nor movable.

Calling QEvent::ignore() or QEvent::accept() on the event has no effect.

The default implementation calls mousePressEvent(). If you want to keep the base implementation when reimplementing this method, call QGraphicsItem::mouseDoubleClickEvent() in your reimplementation.

See also

mousePressEvent(), mouseMoveEvent(), mouseReleaseEvent(), sceneEvent()

Reimplemented in QGraphicsTextItem::mouseDoubleClickEvent()

The event handler for event can be reimplemented to receive mouse move events for this item. If you do receive this event, you can be certain that this item also received a mouse press event, and that this item is the current mouse grabber. The mousePressEvent() method decides which graphics item should receive mouse events.

Calling QEvent::ignore() or QEvent::accept() on the event has no effect.

The default implementation handles basic item interaction, such as selection and moving. If you want to keep the base implementation when reimplementing this method, call QGraphicsItem::mouseMoveEvent() in your reimplementation.

See also

mousePressEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), sceneEvent()

Reimplemented in QGraphicsTextItem::mouseMoveEvent()

The event handler for event can be reimplemented to receive mouse press events for this item. Mouse press events are only delivered to items which accept the mouse button which was pressed. By default, an item accepts all mouse buttons however this can be changed by calling setAcceptedMouseButtons(). The mouse press event decides which item should become the mouse grabber.

If you do not reimplement this method the mouse press event will propagate to other items below this item. If you do reimplement this method, the event will be accepted and this item will grab the mouse input. Grabbing the mouse input allows the item to receive future move, release, and doubleclick events.

If you call QEvent::ignore() on event, this item will lose the mouse grab and event will propagate to any topmost item beneath. No further mouse events will be delivered to this item unless a new mouse press event is received.

The default implementation handles basic item interactions, such as selection and moving. If you want to keep the base implementation when reimplementing this method, call QGraphicsItem::mousePressEvent() in your reimplementation. The default implementation calls QEvent::ignore() for items which are neither movable nor selectable.

See also

mouseMoveEvent(), mouseReleaseEvent(), mouseDoubleClickEvent(), sceneEvent()

Reimplemented in QGraphicsTextItem::mousePressEvent()

The event handler for event can be reimplemented to receive mouse release events for this item. Calling QEvent::ignore() or QEvent::accept() on the event has no effect.

The default implementation handles basic item interaction, such as selection and moving. If you want to keep the base implementation when reimplementing this method, call QGraphicsItem::mouseReleaseEvent() in your reimplementation.

See also

mousePressEvent(), mouseMoveEvent(), mouseDoubleClickEvent(), sceneEvent()

Reimplemented in QGraphicsTextItem::mouseReleaseEvent()

This method is equivalent to calling setPos(pos() + QPointF(dx, dy)).

Returns the current QGraphicsItem local opacity which is between 0.0 (transparent) and 1.0 (opaque). This value is combined with any parent values into the effectiveOpacity(). The default opacity is 1.0 and fully opaque.

The effective opacity decides how the item is rendered. The opacity property decides the state of the painter passed to the paint() method. If the item is cached by using ItemCoordinateCache or DeviceCoordinateCache, the effective property will be applied to the item's cache as it is rendered.

See also

setOpacity(), paint(), QGraphicsItem::GraphicsItemFlag

Returns a shape representing the area where this item is opaque. An area is opaque if it is filled using an opaque brush or color (i.e., not transparent). This method is used by isObscuredBy(), which is called by underlying items to determine if they are obscured by this item.

The default implementation returns an empty QPainterPath, indicating that this item is completely transparent and does not obscure any other items.

See also

isObscuredBy(), isObscured(), shape()

Reimplemented in QGraphicsItemGroup::opaqueArea(), QGraphicsSimpleTextItem::opaqueArea(), QGraphicsTextItem::opaqueArea(), QGraphicsPixmapItem::opaqueArea(), QGraphicsLineItem::opaqueArea(), QGraphicsPolygonItem::opaqueArea(), QGraphicsEllipseItem::opaqueArea(), QGraphicsRectItem::opaqueArea(), QGraphicsPathItem::opaqueArea(), QAbstractGraphicsShapeItem::opaqueArea()

This method is usually called by QGraphicsView and paints the contents of an item in local coordinates.

Reimplement this method in a QGraphicsItem subclass to provide the item's painting implementation, using painter. The option parameter provides style options for the item, such as its state, exposed area and its level-of-detail hints. If widget is provided, it points to the widget that is being painted on, otherwise it is a nullptr. For cached painting widget is always a nullptr.

The painter's pen is 0-width by default, and its pen is initialized to the QPalette::Text brush from the paint device's palette. The brush is initialized to QPalette::Window.

Make sure to constrain all painting inside the boundaries of boundingRect() to avoid rendering artifacts (as QGraphicsView does not clip the painter for you). When QPainter renders the outline of a shape using an assigned QPen, half of the outline will be drawn outside the shape you are rendering. QGraphicsItem does not support use of cosmetic pens with a non-zero width. All painting is done in local coordinates.

See also

setCacheMode(), QPen::width(), Item Coordinates, QGraphicsItem::GraphicsItemFlag

Implemented in QGraphicsItemGroup::paint(), QGraphicsLineItem::paint(), QGraphicsPolygonItem::paint(), QGraphicsEllipseItem::paint(), QGraphicsRectItem::paint(), QGraphicsPathItem::paint(), QGraphicsSvgItem::paint(), QGraphicsSimpleTextItem::paint(), QGraphicsTextItem::paint(), QGraphicsPixmapItem::paint()

Returns the QGraphicsItem panel or a nullptr if this item does not have a panel. If the item is a panel, it will return itself. Otherwise it will return the closest ancestor that is a panel.

See also

isPanel(), GraphicsItemFlag::ItemIsPanel

Returns the modality for this item.

See also

setPanelModality()

Returns a pointer to the current QGraphicsItem parent. If this item does not have a parent then nullptr is returned.

See also

setParentItem(), childItems()

Returns a pointer to the current QGraphicsItem parent, cast to a QGraphicsObject. Returns a nullptr if the parent item is not a QGraphicsObject.

See also

parentItem(), childItems()

Returns a pointer to the current QGraphicsItem parent widget. The item's parent widget is the closest parent item that is a widget.

See also

parentItem(), childItems()

Returns the position of the current QGraphicsItem in parent coordinates. If the item has no parent the position is given in scene coordinates. The position of the item describes its origin (local coordinate (0, 0)) in parent coordinates. Equivalent to mapToParent(0, 0).

To determine the item's position in scene coordinates, regardless of its parent, call scenePos().

See also

x(), y(), setPos(), transform(), The Graphics View Coordinate System

Prepares the item for a geometry change. Call this method before changing the bounding rect of an item to keep QGraphicsScene's index up to date. This method will call update() if necessary.

See also

boundingRect()

Removes an event filter on this item from filterItem.

See also

installSceneEventFilter()

Deprecated:

Use resetTransform() instead.

Resets this item's transformation matrix to the identity matrix or all the transformation properties to their default values. This is equivalent to calling setTransform(QTransform()).

See also

setTransform(), transform()

Returns the clockwise rotation, in degrees, around the Z axis. The default value is 0 which means the item is not rotated. The rotation is combined with the item's scale(), transform() and transformations() to map the item's coordinate system to the parent item.

See also

setRotation(), transformOriginPoint()

Returns the scale factor of the item. The default scale factor is 1.0 which means the item is not scaled. The scale is combined with the item's rotation(), transform() and transformations() to map the item's coordinate system to the parent item.

See also

setScale(), rotation()

Returns the current scene for the item or a nullptr if the item is not stored in a scene.

To add or move an item to a scene, call QGraphicsScene::addItem().

Returns the bounding rect of this item in scene coordinates, by combining sceneTransform() with boundingRect().

See also

boundingRect(), The Graphics View Coordinate System

This method receives events to this item. Reimplement this method to intercept events before they are dispatched to the specialized event handlers contextMenuEvent(), focusInEvent(), focusOutEvent(), hoverEnterEvent(), hoverMoveEvent(), hoverLeaveEvent(), keyPressEvent(), keyReleaseEvent(), mousePressEvent(), mouseReleaseEvent(), mouseMoveEvent(), and mouseDoubleClickEvent().

Returns true if the event was recognized and handled, otherwise false is returned. The event is the intercepted event.

Reimplemented in QGraphicsTextItem::sceneEvent()

Filters events for the item watched. The event is the filtered event.

Reimplementing this method in a subclass makes it possible for the item to be used as an event filter for other items, intercepting all the events sent to those items before they are able to respond. Reimplementations must return true to prevent further processing of a given event, ensuring that it will not be delivered to the watched item, or return false to indicate that the event should be propagated further by the event system.

See also

installSceneEventFilter()

Deprecated:

Use sceneTransform() instead.

See also

transform(), setTransform(), scenePos(), The Graphics View Coordinate System

Returns the item's position in scene coordinates. This is equivalent to calling mapToScene(0, 0).

See also

pos(), sceneTransform(), The Graphics View Coordinate System

Returns this item's scene transformation matrix. This matrix can be used to map coordinates and geometrical shapes from this item's local coordinate system to the scene's coordinate system. To map coordinates from the scene, you must first invert the returned matrix.

Unlike transform() which returns only an item's local transformation, this method includes the item's and any parent's position, and all the transformation properties.

See also

transform(), setTransform(), scenePos(), The Graphics View Coordinate System

Scrolls the contents of rectF by dx, dy. If rectF is a null rectangle, the item's bounding rectangle is scrolled.

Scrolling provides a fast alternative to simply redrawing when the contents of the item (or parts of the item) are shifted vertically or horizontally. Depending on the current transformation and the capabilities of the paint device (i.e., the viewport), this operation may consist of simply moving pixels from one location to another using memmove(). In most cases this is faster than rerendering the entire area.

After scrolling, the item will issue an update for the newly exposed areas. Scrolling is only supported when QGraphicsItem::ItemCoordinateCache is enabled. If scrolling is not supported, this method is equivalent to calling update(rectF).

If the item is opaque and not overlapped by other items, you can map the rectF to viewport coordinates and scroll the viewport as shown below

See also

boundingRect()

If on is true this item will accept drag and drop events, otherwise it is transparent for drag and drop events. By default, items do not accept drag and drop events.

See also

acceptDrops()

Sets the mouse buttons that this item accepts mouse events for. By default, all mouse buttons are accepted. If an item accepts a mouse button, it will become the mouse grabber item when a mouse press event is delivered for that button. However, if the item does not accept the mouse button, QGraphicsScene will forward the mouse events to the first item beneath it that does.

To disable mouse events for an item call setAcceptedMouseButtons(0).

See also

acceptedMouseButtons(), mousePressEvent()

If enabled is true, this item will accept hover events, otherwise it will ignore them. By default, items do not accept hover events. Hover events are delivered when there is no current mouse grabber item. They are sent when the mouse cursor enters an item, when it moves around inside the item, and when the cursor leaves an item. Hover events are commonly used to highlight an item when the mouse enters the item.

Parent items receive hover enter events before their children, and leave events after their children. The parent does not receive a hover leave event if the cursor enters a child. The parent stays "hovered" until the cursor leaves the current area, including any children's areas.

If a parent item handles child events, it will receive hover move, drag move, and drop events as the cursor passes through its children, but it does not receive hover enter and hover leave, nor drag enter and drag leave events on behalf of its children.

A QGraphicsWidget with window decorations will accept hover events regardless of the value of acceptHoverEvents().

See also

acceptHoverEvents(), hoverEnterEvent(), hoverMoveEvent(), hoverLeaveEvent()

If enabled is true this item will accept touch events, otherwise it will ignore them. By default items do not accept touch events.

See also

acceptTouchEvents()

If active is true and the scene is active, this item's panel will be activated. Otherwise, the panel is deactivated.

If the item is not part of an active scene, active will decide what happens to the panel when the scene becomes active or the item is added to the scene. If true, the item's panel will be activated when the item is either added to the scene or the scene is activated. Otherwise, the item will stay inactive independent of the scene's activated state.

See also

isPanel(), QGraphicsScene::setActivePanel(), QGraphicsScene::isActive()

Sets the bounding region granularity to granularity which is a value between and including 0 and 1. The default value is 0 which is the lowest granularity and the bounding region corresponds to the item's bounding rectangle.

The value of granularity describes the ratio between device resolution and the resolution of the bounding region. For example, a value of 0.25 will provide a region where each chunk corresponds to 4x4 device units / pixels.

The granularity is used by boundingRegion() to calculate how fine the bounding region of the item should be. The highest achievable granularity is 1, where boundingRegion() will return the finest outline possible for the respective device. For example, when using a QGraphicsView viewport, this gives you a pixel-perfect bounding region.

See also

boundingRegionGranularity()

Sets the item's cache mode to mode. The optional cacheSize argument is used only by ItemCoordinateCache mode, and describes the resolution of the cache buffer. If cacheSize is (100, 100), QGraphicsItem will fit the item into 100x100 pixels in graphics memory, regardless of the logical size of the item itself. By default QGraphicsItem uses the size of boundingRect(). For all other cache modes than ItemCoordinateCache, cacheSize is ignored.

Caching can speed up rendering if your item spends a significant time redrawing itself. In some cases the cache can also slow down rendering, in particular when the item spends less time redrawing than QGraphicsItem spends redrawing from the cache. When enabled, the item's paint() method will be called only once for each call to update(); for any subsequent repaint requests, the Graphics View system will redraw from the cache. This approach works particularly well with QGLWidget, which stores all the cache as OpenGL textures.

QPixmapCache's cache limit may need to be changed to obtain optimal performance. For more information about the different cache modes, refer to CacheMode.

See also

cacheMode(), CacheMode, QPixmapCache::setCacheLimit()

Sets the current cursor shape for the item to cursor. The mouse cursor will assume this shape when it is over the current item. Refer to Qt::CursorShape for a list of predefined cursor objects and for a range of useful shapes. If no cursor has been set the cursor of the next item in the Z order is used.

For example, an editor item might want to use an I-beam cursor as shown below.

See also

cursor(), hasCursor(), unsetCursor(), QWidget::cursor, QApplication::overrideCursor()

Sets this item's custom data for the key to value. Custom item data is useful for storing arbitrary properties for any item. CopperSpice does not use this feature for storing data, it is provided for user applications.

See also

data()

If enabled is true the item is enabled, otherwise it is disabled. Items are enabled by default.

Disabled items are visible, but they do not receive any events, and can not take focus nor be selected. Mouse events are discarded; they are not propagated unless the item is also invisible, or if it does not accept mouse events (see acceptedMouseButtons()). A disabled item can not become the mouse grabber, and as a result of this, an item loses the grab if it becomes disabled when grabbing the mouse, just like it loses focus if it had focus when it was disabled.

Disabled items are traditionally drawn using grayed-out colors (see QPalette::Disabled).

If you disable a parent item, all its children will also be disabled. If you enable a parent item, all children will be enabled, unless they have been explicitly disabled. For example, if you call setEnabled(false) on a child, it will not be re-enabled if its parent is disabled, and then enabled again.

If you install an event filter, you can still intercept events before they are delivered to items. This mechanism disregards the item's enabled state.

See also

isEnabled()

If enabled is true, this item is set to filter all events for all its children, otherwise if enabled is false, this item will only handle its own events. The default value is false.

See also

filtersChildEvents()

If enabled is true the item flag is enabled, otherwise, it is disabled.

See also

flags(), setFlags()

Sets the item flags to flags. All flags in flags are enabled, all flags not in flags are disabled. If the item had focus and flags does not enable QGraphicsItem::ItemIsFocusable, the item loses focus as a result of calling this method. Similarly, if the item was selected, and flags does not enabled ItemIsSelectable, the item is automatically unselected.

By default no flags are enabled. QGraphicsWidget enables the ItemSendsGeometryChanges flag by default in order to track position changes.

See also

flags(), setFlag()

Gives keyboard input focus to this item. The focusReason argument will be passed into any focus event generated by this method, it is used to give an explanation of what caused the item to get focus. Only enabled items that set the QGraphicsItem::ItemIsFocusable flag can accept keyboard focus.

If this item is not visible, not active, or not associated with a scene, it will not gain immediate input focus. However, it will be registered as the preferred focus item for its subtree of items, should it later become visible.

As a result of calling this method, this item will receive a focus in event with focusReason. If another item already has focus, that item will first receive a focus out event indicating that it has lost input focus.

See also

clearFocus(), hasFocus(), focusItem(), focusProxy()

Sets the item's focus proxy to graphicsItem. If an item has a focus proxy, the focus proxy will receive input focus when the item gains input focus. The item itself will still have focus, but only the focus proxy will receive the keyboard input.

A focus proxy can itself have a focus proxy, and so on. In such case, keyboard input will be handled by the outermost focus proxy. The focus proxy graphicsItem must belong to the same scene as the current QGraphicsItem.

See also

focusProxy(), setFocus(), hasFocus()

Sets effect as the item's effect. If there already is an effect installed on this item, QGraphicsItem will delete the existing effect before installing the new effect. If effect is the installed on a different item, setGraphicsEffect() will remove the effect from the item and install it on this item.

QGraphicsItem takes ownership of effect. This method will apply the effect on itself and all its children.

See also

graphicsEffect()

Adds the current QGraphicsItems to the group. If group is a nullptr this item is removed from any current group and added as a child of the previous group's parent.

See also

group(), QGraphicsScene::createItemGroup()

Deprecated:

If enabled is true, this item is set to handle all events for all its children (i.e., all events intended for any of its children are instead sent to this item), otherwise if enabled is false, this item will only handle its own events. The default value is false.

This property is useful for item groups; it allows one item to handle events on behalf of its children, as opposed to its children handling their events individually.

If a child item accepts hover events, its parent will receive hover move events as the cursor passes through the child, but it does not receive hover enter and hover leave events on behalf of its child.

See also

QGraphicsItem::handlesChildEvents()

Sets the current input method hints of this item to hints.

See also

inputMethodHints(), inputMethodQuery()

Deprecated:

Sets the item's affine transformation matrix. This is a subset or the item's full transformation matrix, and might not represent the item's full transformation.

Use setTransform() instead.

See also

QGraphicsItem::matrix(), transform(), The Graphics View Coordinate System

Sets this item's local opacity, between 0.0 (transparent) and 1.0 (opaque). The item's local opacity is combined with parent and ancestor opacities into the effectiveOpacity(). By default, opacity propagates from parent to child, so if a parent's opacity is 0.5 and the child is also 0.5, the child's effective opacity will be 0.25.

The opacity property decides the state of the painter passed to the paint() method. If the item is cached, i.e., ItemCoordinateCache or DeviceCoordinateCache, the effective property will be applied to the item's cache as it is rendered.

There are two item flags which affect how the item's opacity is combined with the parent.

• QGraphicsItem::ItemIgnoresParentOpacity
• QGraphicsItem::ItemDoesntPropagateOpacityToChildren

See also

opacity(), effectiveOpacity(), QGraphicsItem::GraphicsItemFlag

Sets the modality for this item to panelModality. Changing the modality of a visible item takes effect immediately.

See also

panelModality()

Sets the current QGraphicsItem parent to parent. If this item already has a parent, it is first removed from the previous parent. If parent is a nullptr this item will become a top-level item. This implicitly adds this QGraphicsItem to the scene of the parent. You should not add the item to the scene yourself.

Calling this method on an item that is an ancestor of parent is undefined behavior.

See also

parentItem(), childItems()

Sets the position of the item to pos, which is in parent coordinates. For items with no parent pos is in scene coordinates. The position of the item describes its origin (local coordinate (0, 0)) in parent coordinates.

See also

pos(), scenePos(), The Graphics View Coordinate System

This method is equivalent to calling setPos(QPointF(x, y).

Sets the clockwise rotation angle, in degrees, around the Z axis. The default value is 0 which means the item is not rotated. Assigning a negative value will rotate the item counter-clockwise. Normally the rotation angle is in the range (-360, 360), but it is also possible to assign values outside of this range. For example, a rotation of 370 degrees is the same as a rotation of 10 degrees.

The item is rotated around its transform origin point, which by default is (0, 0). You can select a different transformation origin by calling setTransformOriginPoint(). The rotation is combined with the item's scale(), transform() and transformations() to map the item's coordinate system to the parent item.

See also

rotation(), setTransformOriginPoint()

Sets the scale factor of the current QGraphicsItem. The default scale factor is 1.0 which means the item is not scaled. A scale factor of 0.0 will collapse the item to a single point. If you provide a negative scale factor, the item will be flipped and mirrored.

The item is scaled around its transform origin point, which by default is (0, 0). You can select a different transformation origin by calling setTransformOriginPoint(). The scale is combined with the item's rotation(), transform() and transformations() to map the item's coordinate system to the parent item.

See also

scale(), setTransformOriginPoint()

If selected is true and the current QGraphicsItem is selectable this item becomes selected, otherwise it is unselected. If the item is in a group the whole group's selected state is toggled by this method. If the group is selected, all items in the group are also selected, and if the group is not selected, no item in the group is selected.

Only visible, enabled, selectable items can be selected. If selected is true and this item is either invisible or disabled or unselectable, this method does nothing. By default items can not be selected. To enable selection set the ItemIsSelectable flag.

This method is provided to allow individual toggling of the selected state of an item. It is more common to call QGraphicsScene::setSelectionArea(), which will invoke this method for all visible, enabled, and selectable items within a specified area on the scene.

See also

isSelected(), QGraphicsScene::selectedItems()