QRubberBand ¶

概要 ¶

详细描述 ¶

A rubber band is often used to show a new bounding area (as in a QSplitter 或 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:

class Widget:
    def mousePressEvent(self, event):
        origin = event.pos()
        if not self.rubberBand:
            self.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.

调用 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 或 Line (vertical or horizontal), depending on the shape() it was given when constructed.

class QRubberBand ( arg__1 [ , parent=None ] ) ¶

param parent

QWidget

param arg__1

形状

Constructs a rubber band of shape s ，采用父级 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.

PySide2.QtWidgets.QRubberBand. 形状 ¶

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 .

常量	描述
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.

PySide2.QtWidgets.QRubberBand. initStyleOption ( option ) ¶

参数

option – QStyleOptionRubberBand

初始化 option 采用值来自此 QRubberBand 。此方法对子类是有用的，当需要 QStyleOptionRubberBand , but don’t want to fill in all the information themselves.

另请参阅

initFrom()

PySide2.QtWidgets.QRubberBand. shape ( ) ¶

返回类型

形状

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