- class QRubberBand¶
The
QRubberBand
class provides a rectangle or line that can indicate a selection or a boundary. More…Synopsis¶
Methods¶
def
__init__()
def
shape()
Virtual methods¶
Note
This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE
Detailed Description¶
Warning
This section contains snippets that were automatically translated from C++ to Python and may contain errors.
A rubber band is often used to show a new bounding area (as in a
QSplitter
or aQDockWidget
that is undocking). Historically this has been implemented using a QPainter and XOR, but this approach doesn’t always work properly since rendering can happen in the window below the rubber band, but before the rubber band has been “erased”.You can create a
QRubberBand
whenever you need to render a rubber band around a given area (or to represent a single line), then callsetGeometry()
,move()
orresize()
to position and size it. A common pattern is to do this in conjunction with mouse events. For example:def mousePressEvent(self, event): origin = event.pos() if not rubberBand: rubberBand = QRubberBand(QRubberBand.Rectangle, self) rubberBand.setGeometry(QRect(origin, QSize())) rubberBand.show() def mouseMoveEvent(self, event): rubberBand.setGeometry(QRect(origin, event.pos()).normalized()) def mouseReleaseEvent(self, event): rubberBand.hide() # determine selection, for example using QRect::intersects() # and QRect::contains().
If you pass a parent to
QRubberBand
‘s constructor, the rubber band will display only inside its parent, but stays on top of other child widgets. If no parent is passed,QRubberBand
will act as a top-level widget.Call
show()
to make the rubber band visible; also when the rubber band is not a top-level. Hiding or destroying the widget will make the rubber band disappear. The rubber band can be aRectangle
or aLine
(vertical or horizontal), depending on theshape()
it was given when constructed.- class Shape¶
This enum specifies what shape a
QRubberBand
should have. This is a drawing hint that is passed down to the style system, and can be interpreted by eachQStyle
.Constant
Description
QRubberBand.Line
A
QRubberBand
can represent a vertical or horizontal line. Geometry is still given inrect()
and the line will fill the given geometry on most styles.QRubberBand.Rectangle
A
QRubberBand
can represent a rectangle. Some styles will interpret this as a filled (often semi-transparent) rectangle, or a rectangular outline.
Constructs a rubber band of shape
s
, with parentp
.By default a rectangular rubber band (
s
isRectangle
) will use a mask, so that a small border of the rectangle is all that is visible. Some styles (e.g., native macOS) will change this and callsetWindowOpacity()
to make a semi-transparent filled selection rectangle.- initStyleOption(option)¶
- Parameters:
option –
QStyleOptionRubberBand
Initialize
option
with the values from thisQRubberBand
. This method is useful for subclasses when they need aQStyleOptionRubberBand
, but don’t want to fill in all the information themselves.See also
Returns the shape of this rubber band. The shape can only be set upon construction.