graph_view.py 文件源码

def frameNodes(self, nodes):
        if len(nodes) == 0:
            return

        def computeWindowFrame():
            windowRect = self.rect()
            windowRect.setLeft(windowRect.left() + 10)
            windowRect.setRight(windowRect.right() - 10)
            windowRect.setTop(windowRect.top() + 10)
            windowRect.setBottom(windowRect.bottom() - 10)
            return windowRect

        nodesRect = None
        for node in nodes:
            nodeRectF = node.transform().mapRect(node.rect())
            nodeRect = QtCore.QRect(nodeRectF.x(), nodeRectF.y(), nodeRectF.width(), nodeRectF.height())
            if nodesRect is None:
                nodesRect = nodeRect
            else:
                nodesRect = nodesRect.united(nodeRect)

        windowRect = computeWindowFrame()

        scaleX = float(windowRect.width()) / float(nodesRect.width())
        scaleY = float(windowRect.height()) / float(nodesRect.height())
        if scaleY > scaleX:
            scale = scaleX
        else:
            scale = scaleY

        if scale < 1.0:
            self.setTransform(QtGui.QTransform.fromScale(scale, scale))
        else:
            self.setTransform(QtGui.QTransform())

        sceneRect = self.sceneRect()
        pan = sceneRect.center() - nodesRect.center()
        sceneRect.translate(-pan.x(), -pan.y())
        self.setSceneRect(sceneRect)

        # Update the main panel when reframing.
        self.update()