def tearDownClass(cls):
     """Run after all tests"""
     TestQgsPalLabeling.tearDownClass()
     cls.removeMapLayer(cls.layer)
     cls.layer = None
     # avoid crash on finish, probably related to https://bugreports.qt.io/browse/QTBUG-35760
     QThreadPool.globalInstance().waitForDone()

    def __init__(self, iface, startX, startY, endX, endY, parent=None):
        """Constructor."""
        super(OSMDownloaderDialog, self).__init__(parent)
        # Set up the user interface from Designer.
        # After setupUI you can access any designer object by doing
        # self.<objectname>, and you can use autoconnect slots - see
        # http://qt-project.org/doc/qt-4.8/designer-using-a-ui-file.html
        # #widgets-and-dialogs-with-auto-connect
        self.setupUi(self)

        self.iface = iface

        self.setCoordinates(startX, startY, endX, endY)

        self.threadpool = QThreadPool()

        self.size = 0

 def tearDownClass(cls):
     TestQgsPalLabeling.tearDownClass()
     # avoid crash on finish, probably related to https://bugreports.qt.io/browse/QTBUG-35760
     QThreadPool.globalInstance().waitForDone()

class OSMDownloaderDialog(QDialog, FORM_CLASS):
    def __init__(self, iface, startX, startY, endX, endY, parent=None):
        """Constructor."""
        super(OSMDownloaderDialog, self).__init__(parent)
        # Set up the user interface from Designer.
        # After setupUI you can access any designer object by doing
        # self.<objectname>, and you can use autoconnect slots - see
        # http://qt-project.org/doc/qt-4.8/designer-using-a-ui-file.html
        # #widgets-and-dialogs-with-auto-connect
        self.setupUi(self)

        self.iface = iface

        self.setCoordinates(startX, startY, endX, endY)

        self.threadpool = QThreadPool()

        self.size = 0

    def setCoordinates(self, startX, startY, endX, endY):
        if startX < endX:
            minLong = startX
            maxLong = endX
        else:
            minLong = endX
            maxLong = startX

        if startY < endY:
            minLat = startY
            maxLat = endY
        else:
            minLat = endY
            maxLat = startY

        self.wEdit.setText(str(minLong))
        self.sEdit.setText(str(minLat))
        self.eEdit.setText(str(maxLong))
        self.nEdit.setText(str(maxLat))

    @pyqtSlot()
    def on_saveButton_clicked(self):
        ret = QFileDialog.getSaveFileName(parent=None, caption='Define file name and location', filter='OSM Files(*.osm)')
        fileName = ret[0]

        split = fileName.split('.')
        if len(split)>0 and split[-1] == 'osm':
            pass
        else:
            fileName += '.osm'

        self.filenameEdit.setText(fileName)

    @pyqtSlot()
    def on_button_box_accepted(self):
        if self.filenameEdit.text() == '':
            QMessageBox.warning(self, self.tr("Warning!"), self.tr("Please, select a location to save the file."))
            return

        # Initiating processing
        osmRequest = OSMRequest(self.filenameEdit.text())
        osmRequest.setParameters(self.wEdit.text(), self.sEdit.text(), self.eEdit.text(), self.nEdit.text())
        # Connecting end signal
        osmRequest.signals.processFinished.connect(self.processFinished)
        osmRequest.signals.sizeReported.connect(self.reportSize)
        osmRequest.signals.proxyOpened.connect(self.proxy)
        osmRequest.signals.errorOccurred.connect(self.errorOccurred)
        osmRequest.signals.userCanceled.connect(self.userCanceled)
        # Setting the progress bar
        self.progressMessageBar = self.iface.messageBar().createMessage('Downloading data...')
        self.progressBar = QProgressBar()
        self.progressBar.setAlignment(Qt.AlignLeft|Qt.AlignVCenter)
        self.progressMessageBar.layout().addWidget(self.progressBar)
        self.iface.messageBar().pushWidget(self.progressMessageBar, Qgis.Info)
        self.progressBar.setRange(0, 0)
        self.progressMessageBar.destroyed.connect(osmRequest.signals.cancel)
        # Starting process
        self.threadpool.start(osmRequest)

    @pyqtSlot(str)
    def proxy(self, proxy):
        self.progressMessageBar.setText('Proxy set to: '+proxy)

    @pyqtSlot(str)
    def errorOccurred(self, message):
        QMessageBox.warning(self, 'Fatal!', message)
        self.close()

    @pyqtSlot()
    def userCanceled(self):
        QMessageBox.warning(self, 'Info!', 'Process canceled by user!')
        self.close()

    @pyqtSlot(float)
    def reportSize(self, size):
        self.size = size
        self.progressMessageBar.setText('Downloading: '+"{0:.2f}".format(size)+' megabytes from OSM servers...')

    @pyqtSlot(str)
    def processFinished(self, message):
        self.progressBar.setRange(0, 100)
#.........这里部分代码省略.........