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#

def initStyleOption()

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 a QDockWidget 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 call setGeometry() , move() or resize() 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 a Rectangle or a Line (vertical or horizontal), depending on the shape() 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 each QStyle .

Constant

Description

QRubberBand.Line

A QRubberBand can represent a vertical or horizontal line. Geometry is still given in rect() 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.

Constant	Description
QRubberBand.Line	A `QRubberBand` can represent a vertical or horizontal line. Geometry is still given in `rect()` 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.

__init__(arg__1[, parent=None])#

Parameters:

arg__1 – Shape
parent – QWidget

Constructs a rubber band of shape s, with parent p.

By default a rectangular rubber band (s is Rectangle) 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 call setWindowOpacity() to make a semi-transparent filled selection rectangle.

initStyleOption(option)#

Parameters:: option – QStyleOptionRubberBand

Initialize option with the values from this QRubberBand . This method is useful for subclasses when they need a QStyleOptionRubberBand , but don’t want to fill in all the information themselves.

See also

initFrom()

shape()#

Return type:: Shape

Returns the shape of this rubber band. The shape can only be set upon construction.