svgviewer.py 文件源码

def openFile(self, svg_file):
        if not svg_file.exists():
            return

        s = self.scene()

        if self.backgroundItem:
            drawBackground = self.backgroundItem.isVisible()
        else:
            drawBackground = False

        if self.outlineItem:
            drawOutline = self.outlineItem.isVisible()
        else:
            drawOutline = True

        s.clear()
        self.resetTransform()

        self.svgItem = QGraphicsSvgItem(svg_file.fileName())
        self.svgItem.setFlags(QGraphicsItem.ItemClipsToShape)
        self.svgItem.setCacheMode(QGraphicsItem.NoCache)
        self.svgItem.setZValue(0)

        self.backgroundItem = QGraphicsRectItem(self.svgItem.boundingRect())
        self.backgroundItem.setBrush(Qt.white)
        self.backgroundItem.setPen(QPen(Qt.NoPen))
        self.backgroundItem.setVisible(drawBackground)
        self.backgroundItem.setZValue(-1)

        self.outlineItem = QGraphicsRectItem(self.svgItem.boundingRect())
        outline = QPen(Qt.black, 2, Qt.DashLine)
        outline.setCosmetic(True)
        self.outlineItem.setPen(outline)
        self.outlineItem.setBrush(QBrush(Qt.NoBrush))
        self.outlineItem.setVisible(drawOutline)
        self.outlineItem.setZValue(1)

        s.addItem(self.backgroundItem)
        s.addItem(self.svgItem)
        s.addItem(self.outlineItem)

        s.setSceneRect(self.outlineItem.boundingRect().adjusted(-10, -10, 10, 10))