Qgraphicsitem slots

Otherwise returns the value that was returned from the event handler.The scene palette defaults to, and resolves all its entries from, QApplication::palette.This property holds the minimal view-transformed size an item must have to be drawn.The size of each scene segment is determined by the following algorithm.

Renders the source rect from scene into target, using painter.So we need to inherit our class from QObject as well to access the signal slot functionality.For dynamic scenes, or scenes with many animated items, the index bookkeeping can outweight the fast lookup speeds.Play Hit It Rich! - The free online casino slots game with slot machines for fun like Wizard of Oz, Duck Dynasty and more! No download required.Due to the scaling, smaller items will only make an insignificant contribution to the final rendered scene.With the QGraphicsView widget, you can either visualize the whole scene, or zoom in and view only parts of the scene.

See also QGraphicsItem::isActive () and QWidget::isActiveWindow ().Groups all items in items into a new QGraphicsItemGroup, and returns a pointer to the group.However, tripleclick events are not delivered as doubleclick events in this case.The region parameter contains a list of scene rectangles that indicate the area that has been changed.

Returns the topmost visible item at the specified position, or 0 if there are no items at this position.If an item is not rendered and it clips its children items they will also not be rendered.The group is created with the common ancestor of items as its parent, and with position (0, 0).This event handler, for event focusEvent, can be reimplemented in a subclass to receive focus out events.Because of this, you should always set the scene rect when operating on large scenes.

See also addEllipse (), addLine (), addPath (), addRect (), addText (), addItem (), and addWidget ().If the doubleclick event is delivered to a different item than the one that received the first press and release, it will be delivered as a press event.Note: See items () for a definition of which items are considered visible by this function.

QGraphicsScene applies an indexing algorithm to the scene, to speed up item discovery functions like items () and itemAt ().Note that you can also use the Animation Framework for animations.If it does belong to scene already (i.e., it is moved to this scene), QGraphicsScene will send an addition notification as the item is removed from its previous scene.Returns all visible items that, depending on mode, are either inside or intersect with the specified path, in a list sorted using order.The list of returned items is sorted by stacking order, with the topmost item being the first item in the list.See also invalidate () and QGraphicsView::invalidateScene ().You can call selectedItems () to get the new list of selected items.If the scene has focus, hasFocus () will return true, and key events will be forwarded to the focus item, if any.This convenience function is equivalent to calling sceneRect().height().

If there is no item at the given position on the scene, the selection area is reset, any focus item loses its input focus, and the event is then ignored.By default, the event is delivered to the topmost visible item under the cursor.

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Draws the foreground of the scene using painter, after the background and all items have been drawn.If any item has focus when this function is called, it will lose focus, and regain focus again once the scene regains focus.You need to create a QGraphicsView widget to visualize the scene.It is used together with QGraphicsView for visualizing graphical items, such as lines, rectangles, text, or even custom items, on a 2D surface.You can avoid potential slowdowns by fixating the tree depth through setting this property.For convenience, there is also an itemAt () function that returns the topmost item at a given position.

The default implementation is based on the tab focus chain defined by QGraphicsWidget::setTabOrder ().If the item is a panel, the scene is active, and there is no active panel in the scene, then the item will be activated.When QGraphicsScene draws the scene contents, it renders each of these layers separately, in order.The scene font defaults to, and resolves all its entries from, QApplication::font.This event handler, for event event, can be reimplemented in a subclass to receive input method events for the scene.

These items respond by resolving their own palettes to the scene, and they then notify their children, who again notify their children, and so on, until all widget items have updated their palettes.

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To send an event to a scene, you construct an event that inherits QEvent, and then send it using, for example, QApplication::sendEvent (). event () is responsible for dispatching the event to the individual items.To avoid drawing these items and reduce the time necessary to render the scene, you can call setMinimumRenderSize() with a non-negative value.QGraphicsObject is a predefined class which does the same thing but it is relatively slow as it has lot of other signals which you might not require.