Python RectangleMapTool.RectangleMapTool类代码示例

    def __init__(self, dialog, param):
        super(ExtentSelectionPanel, self).__init__(None)
        self.setupUi(self)

        self.dialog = dialog
        self.param = param
        if self.param.flags() & QgsProcessingParameterDefinition.FlagOptional:
            if hasattr(self.leText, 'setPlaceholderText'):
                self.leText.setPlaceholderText(
                    self.tr('[Leave blank to use min covering extent]'))

        self.btnSelect.clicked.connect(self.selectExtent)

        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.tool.rectangleCreated.connect(self.updateExtent)

        if param.defaultValue() is not None:
            context = createContext()
            rect = QgsProcessingParameters.parameterAsExtent(param, {param.name(): param.defaultValue()}, context)
            if not rect.isNull():
                try:
                    s = '{},{},{},{}'.format(
                        rect.xMinimum(), rect.xMaximum(), rect.yMinimum(), rect.yMaximum())
                    self.leText.setText(s)
                except:
                    pass

    def __init__(self, dialog, alg, default=None):
        super(ExtentSelectionPanel, self).__init__(None)
        self.setupUi(self)

        self.dialog = dialog
        self.params = alg.parameters
        if self.canUseAutoExtent():
            if hasattr(self.leText, "setPlaceholderText"):
                self.leText.setPlaceholderText(self.tr("[Leave blank to use min covering extent]"))

        self.btnSelect.clicked.connect(self.selectExtent)

        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.tool.rectangleCreated.connect(self.updateExtent)

        if default:
            tokens = unicode(default).split(",")
            if len(tokens) == 4:
                try:
                    float(tokens[0])
                    float(tokens[1])
                    float(tokens[2])
                    float(tokens[3])
                    self.leText.setText(unicode(default))
                except:
                    pass

    def __init__(self, parent=None):
        super(BboxWidget, self).__init__(parent)
        self.setupUi(self)

        self.dialog = None

        self.btnSelect.clicked.connect(self.selectExtent)

        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.tool.rectangleCreated.connect(self.updateExtent)

    def __init__(self, dialog, alg, default):
        QWidget.__init__(self)
        self.setupUi(self)

        self.dialog = dialog
        self.params = alg.parameters
        if self.canUseAutoExtent():
            if hasattr(self.leText, "setPlaceholderText"):
                self.leText.setPlaceholderText(self.tr("[Leave blank to use min covering extent]"))

        self.btnSelect.clicked.connect(self.selectExtent)

        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.tool.rectangleCreated.connect(self.updateExtent)

 def __init__(self, dialog, alg, default):
     super(ExtentSelectionPanel, self).__init__(None)
     self.dialog = dialog
     self.params = alg.parameters
     self.horizontalLayout = QtGui.QHBoxLayout(self)
     self.horizontalLayout.setSpacing(2)
     self.horizontalLayout.setMargin(0)
     self.text = QtGui.QLineEdit()
     #self.text.setText(default)
     self.text.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
     if self.canUseAutoExtent():
         if hasattr(self.text, 'setPlaceholderText'):
             self.text.setPlaceholderText("[Leave blank to use min covering extent]")
     self.horizontalLayout.addWidget(self.text)
     self.pushButton = QtGui.QPushButton()
     self.pushButton.setText("...")
     self.pushButton.clicked.connect(self.buttonPushed)
     self.horizontalLayout.addWidget(self.pushButton)
     self.setLayout(self.horizontalLayout)
     canvas = QGisLayers.iface.mapCanvas()
     self.prevMapTool = canvas.mapTool()
     self.tool = RectangleMapTool(canvas)
     self.connect(self.tool, SIGNAL("rectangleCreated()"), self.fillCoords)

class ExtentSelectionPanel(QWidget, Ui_Form):
    def __init__(self, dialog, alg, default):
        QWidget.__init__(self)
        self.setupUi(self)

        self.dialog = dialog
        self.params = alg.parameters
        if self.canUseAutoExtent():
            if hasattr(self.leText, "setPlaceholderText"):
                self.leText.setPlaceholderText(self.tr("[Leave blank to use min covering extent]"))

        self.btnSelect.clicked.connect(self.selectExtent)

        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.tool.rectangleCreated.connect(self.updateExtent)

    def canUseAutoExtent(self):
        for param in self.params:
            if isinstance(param, (ParameterRaster, ParameterVector)):
                return True
            if isinstance(param, ParameterMultipleInput):
                return True

        return False

    def selectExtent(self):
        popupmenu = QMenu()
        useLayerExtentAction = QAction(self.tr("Use layer/canvas extent"), self.btnSelect)
        selectOnCanvasAction = QAction(self.tr("Select extent on canvas"), self.btnSelect)

        popupmenu.addAction(useLayerExtentAction)
        popupmenu.addAction(selectOnCanvasAction)

        selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
        useLayerExtentAction.triggered.connect(self.useLayerExtent)

        if self.canUseAutoExtent():
            useMincoveringExtentAction = QAction(self.tr("Use min covering extent from input layers"), self.btnSelect)
            useMincoveringExtentAction.triggered.connect(self.useMinCoveringExtent)
            popupmenu.addAction(useMincoveringExtentAction)

        popupmenu.exec_(QCursor.pos())

    def useMinCoveringExtent(self):
        self.leText.setText("")

    def getMinCoveringExtent(self):
        first = True
        found = False
        for param in self.params:
            if param.value:
                if isinstance(param, (ParameterRaster, ParameterVector)):
                    if isinstance(param.value, (QgsRasterLayer, QgsVectorLayer)):
                        layer = param.value
                    else:
                        layer = dataobjects.getObjectFromUri(param.value)
                    if layer:
                        found = True
                        self.addToRegion(layer, first)
                        first = False
                elif isinstance(param, ParameterMultipleInput):
                    layers = param.value.split(";")
                    for layername in layers:
                        layer = dataobjects.getObjectFromUri(layername, first)
                        if layer:
                            found = True
                            self.addToRegion(layer, first)
                            first = False
        if found:
            return "{},{},{},{}".format(self.xmin, self.xmax, self.ymin, self.ymax)
        else:
            return None

    def useNewAlg(self, alg):
        self.params = alg.parameters

    def addToRegion(self, layer, first):
        if first:
            self.xmin = layer.extent().xMinimum()
            self.xmax = layer.extent().xMaximum()
            self.ymin = layer.extent().yMinimum()
            self.ymax = layer.extent().yMaximum()
        else:
            self.xmin = min(self.xmin, layer.extent().xMinimum())
            self.xmax = max(self.xmax, layer.extent().xMaximum())
            self.ymin = min(self.ymin, layer.extent().yMinimum())
            self.ymax = max(self.ymax, layer.extent().yMaximum())

    def useLayerExtent(self):
        CANVAS_KEY = "Use canvas extent"
        extentsDict = {}
        extentsDict[CANVAS_KEY] = iface.mapCanvas().extent()
        extents = [CANVAS_KEY]
        layers = dataobjects.getAllLayers()
        for layer in layers:
            extents.append(layer.name())
            extentsDict[layer.name()] = layer.extent()
        (item, ok) = QInputDialog.getItem(self, self.tr("Select extent"), self.tr("Use extent from"), extents, False)
#.........这里部分代码省略.........

class ExtentSelectionPanel(BASE, WIDGET):

    hasChanged = pyqtSignal()

    def __init__(self, dialog, param):
        super(ExtentSelectionPanel, self).__init__(None)
        self.setupUi(self)

        self.leText.textChanged.connect(lambda: self.hasChanged.emit())

        self.dialog = dialog
        self.param = param
        self.crs = QgsProject.instance().crs()

        if self.param.flags() & QgsProcessingParameterDefinition.FlagOptional:
            if hasattr(self.leText, 'setPlaceholderText'):
                self.leText.setPlaceholderText(
                    self.tr('[Leave blank to use min covering extent]'))

        self.btnSelect.clicked.connect(self.selectExtent)

        if iface is not None:
            canvas = iface.mapCanvas()
            self.prevMapTool = canvas.mapTool()
            self.tool = RectangleMapTool(canvas)
            self.tool.rectangleCreated.connect(self.updateExtent)
        else:
            self.prevMapTool = None
            self.tool = None

        if param.defaultValue() is not None:
            context = createContext()
            rect = QgsProcessingParameters.parameterAsExtent(param, {param.name(): param.defaultValue()}, context)
            crs = QgsProcessingParameters.parameterAsExtentCrs(param, {param.name(): param.defaultValue()}, context)
            if not rect.isNull():
                try:
                    s = '{},{},{},{}'.format(
                        rect.xMinimum(), rect.xMaximum(), rect.yMinimum(), rect.yMaximum())
                    if crs.isValid():
                        s += ' [' + crs.authid() + ']'
                        self.crs = crs
                    self.leText.setText(s)
                except:
                    pass

    def selectExtent(self):
        popupmenu = QMenu()
        useCanvasExtentAction = QAction(
            QCoreApplication.translate("ExtentSelectionPanel", 'Use Canvas Extent'),
            self.btnSelect)
        useLayerExtentAction = QAction(
            QCoreApplication.translate("ExtentSelectionPanel", 'Use Layer Extent…'),
            self.btnSelect)
        selectOnCanvasAction = QAction(
            self.tr('Select Extent on Canvas'), self.btnSelect)

        popupmenu.addAction(useCanvasExtentAction)
        popupmenu.addAction(selectOnCanvasAction)
        popupmenu.addSeparator()
        popupmenu.addAction(useLayerExtentAction)

        selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
        useLayerExtentAction.triggered.connect(self.useLayerExtent)
        useCanvasExtentAction.triggered.connect(self.useCanvasExtent)

        if self.param.flags() & QgsProcessingParameterDefinition.FlagOptional:
            useMincoveringExtentAction = QAction(
                self.tr('Use Min Covering Extent from Input Layers'),
                self.btnSelect)
            useMincoveringExtentAction.triggered.connect(
                self.useMinCoveringExtent)
            popupmenu.addAction(useMincoveringExtentAction)

        popupmenu.exec_(QCursor.pos())

    def useMinCoveringExtent(self):
        self.leText.setText('')

    def useLayerExtent(self):
        dlg = LayerSelectionDialog(self)
        if dlg.exec_():
            layer = dlg.selected_layer()
            self.setValueFromRect(QgsReferencedRectangle(layer.extent(), layer.crs()))

    def useCanvasExtent(self):
        self.setValueFromRect(QgsReferencedRectangle(iface.mapCanvas().extent(),
                                                     iface.mapCanvas().mapSettings().destinationCrs()))

    def selectOnCanvas(self):
        canvas = iface.mapCanvas()
        canvas.setMapTool(self.tool)
        self.dialog.showMinimized()

    def updateExtent(self):
        r = self.tool.rectangle()
        self.setValueFromRect(r)

    def setValueFromRect(self, r):
        s = '{},{},{},{}'.format(
            r.xMinimum(), r.xMaximum(), r.yMinimum(), r.yMaximum())
#.........这里部分代码省略.........

class ExtentSelectionPanel(BASE, WIDGET):

    def __init__(self, dialog, param):
        super(ExtentSelectionPanel, self).__init__(None)
        self.setupUi(self)

        self.dialog = dialog
        self.param = param
        self.crs = QgsProject.instance().crs()

        if self.param.flags() & QgsProcessingParameterDefinition.FlagOptional:
            if hasattr(self.leText, 'setPlaceholderText'):
                self.leText.setPlaceholderText(
                    self.tr('[Leave blank to use min covering extent]'))

        self.btnSelect.clicked.connect(self.selectExtent)

        if iface is not None:
            canvas = iface.mapCanvas()
            self.prevMapTool = canvas.mapTool()
            self.tool = RectangleMapTool(canvas)
            self.tool.rectangleCreated.connect(self.updateExtent)
        else:
            self.prevMapTool = None
            self.tool = None

        if param.defaultValue() is not None:
            context = createContext()
            rect = QgsProcessingParameters.parameterAsExtent(param, {param.name(): param.defaultValue()}, context)
            crs = QgsProcessingParameters.parameterAsExtentCrs(param, {param.name(): param.defaultValue()}, context)
            if not rect.isNull():
                try:
                    s = '{},{},{},{}'.format(
                        rect.xMinimum(), rect.xMaximum(), rect.yMinimum(), rect.yMaximum())
                    if crs.isValid():
                        s += ' [' + crs.authid() + ']'
                        self.crs = crs
                    self.leText.setText(s)
                except:
                    pass

    def selectExtent(self):
        popupmenu = QMenu()
        useLayerExtentAction = QAction(
            self.tr('Use layer/canvas extent'), self.btnSelect)
        selectOnCanvasAction = QAction(
            self.tr('Select extent on canvas'), self.btnSelect)

        popupmenu.addAction(useLayerExtentAction)
        popupmenu.addAction(selectOnCanvasAction)

        selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
        useLayerExtentAction.triggered.connect(self.useLayerExtent)

        if self.param.flags() & QgsProcessingParameterDefinition.FlagOptional:
            useMincoveringExtentAction = QAction(
                self.tr('Use min covering extent from input layers'),
                self.btnSelect)
            useMincoveringExtentAction.triggered.connect(
                self.useMinCoveringExtent)
            popupmenu.addAction(useMincoveringExtentAction)

        popupmenu.exec_(QCursor.pos())

    def useMinCoveringExtent(self):
        self.leText.setText('')

    def useLayerExtent(self):
        CANVAS_KEY = 'Use canvas extent'
        extentsDict = {}
        extentsDict[CANVAS_KEY] = {"extent": iface.mapCanvas().extent(),
                                   "authid": iface.mapCanvas().mapSettings().destinationCrs().authid()}
        extents = [CANVAS_KEY]
        layers = QgsProcessingUtils.compatibleLayers(QgsProject.instance())
        for layer in layers:
            authid = layer.crs().authid()
            if ProcessingConfig.getSetting(ProcessingConfig.SHOW_CRS_DEF) \
                    and authid is not None:
                layerName = u'{} [{}]'.format(layer.name(), authid)
            else:
                layerName = layer.name()
            extents.append(layerName)
            extentsDict[layerName] = {"extent": layer.extent(), "authid": authid}
        (item, ok) = QInputDialog.getItem(self, self.tr('Select extent'),
                                          self.tr('Use extent from'), extents, False)
        if ok:
            self.setValueFromRect(QgsReferencedRectangle(extentsDict[item]["extent"], QgsCoordinateReferenceSystem(extentsDict[item]["authid"])))

    def selectOnCanvas(self):
        canvas = iface.mapCanvas()
        canvas.setMapTool(self.tool)
        self.dialog.showMinimized()

    def updateExtent(self):
        r = self.tool.rectangle()
        self.setValueFromRect(r)

    def setValueFromRect(self, r):
        s = '{},{},{},{}'.format(
            r.xMinimum(), r.xMaximum(), r.yMinimum(), r.yMaximum())
#.........这里部分代码省略.........

class ExtentSelectionPanel(BASE, WIDGET):
    def __init__(self, dialog, alg, default=None):
        super(ExtentSelectionPanel, self).__init__(None)
        self.setupUi(self)

        self.dialog = dialog
        self.params = alg.parameters
        if self.canUseAutoExtent():
            if hasattr(self.leText, "setPlaceholderText"):
                self.leText.setPlaceholderText(self.tr("[Leave blank to use min covering extent]"))

        self.btnSelect.clicked.connect(self.selectExtent)

        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.tool.rectangleCreated.connect(self.updateExtent)

        if default:
            tokens = unicode(default).split(",")
            if len(tokens) == 4:
                try:
                    float(tokens[0])
                    float(tokens[1])
                    float(tokens[2])
                    float(tokens[3])
                    self.leText.setText(unicode(default))
                except:
                    pass

    def canUseAutoExtent(self):
        for param in self.params:
            if isinstance(param, (ParameterRaster, ParameterVector)):
                return True
            if isinstance(param, ParameterMultipleInput):
                return True

        return False

    def selectExtent(self):
        popupmenu = QMenu()
        useLayerExtentAction = QAction(self.tr("Use layer/canvas extent"), self.btnSelect)
        selectOnCanvasAction = QAction(self.tr("Select extent on canvas"), self.btnSelect)

        popupmenu.addAction(useLayerExtentAction)
        popupmenu.addAction(selectOnCanvasAction)

        selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
        useLayerExtentAction.triggered.connect(self.useLayerExtent)

        if self.canUseAutoExtent():
            useMincoveringExtentAction = QAction(self.tr("Use min covering extent from input layers"), self.btnSelect)
            useMincoveringExtentAction.triggered.connect(self.useMinCoveringExtent)
            popupmenu.addAction(useMincoveringExtentAction)

        popupmenu.exec_(QCursor.pos())

    def useMinCoveringExtent(self):
        self.leText.setText("")

    def getMinCoveringExtent(self):
        first = True
        found = False
        for param in self.params:
            if param.value:
                if isinstance(param, (ParameterRaster, ParameterVector)):
                    if isinstance(param.value, (QgsRasterLayer, QgsVectorLayer)):
                        layer = param.value
                    else:
                        layer = dataobjects.getObject(param.value)
                    if layer:
                        found = True
                        self.addToRegion(layer, first)
                        first = False
                elif isinstance(param, ParameterMultipleInput):
                    layers = param.value.split(";")
                    for layername in layers:
                        layer = dataobjects.getObject(layername)
                        if layer:
                            found = True
                            self.addToRegion(layer, first)
                            first = False
        if found:
            return "{},{},{},{}".format(self.xmin, self.xmax, self.ymin, self.ymax)
        else:
            return None

    def useNewAlg(self, alg):
        self.params = alg.parameters

    def addToRegion(self, layer, first):
        if first:
            self.xmin = layer.extent().xMinimum()
            self.xmax = layer.extent().xMaximum()
            self.ymin = layer.extent().yMinimum()
            self.ymax = layer.extent().yMaximum()
        else:
            self.xmin = min(self.xmin, layer.extent().xMinimum())
            self.xmax = max(self.xmax, layer.extent().xMaximum())
            self.ymin = min(self.ymin, layer.extent().yMinimum())
#.........这里部分代码省略.........

class ExtentSelectionPanel(QtGui.QWidget):

    def __init__(self, dialog, alg, default):
        super(ExtentSelectionPanel, self).__init__(None)
        self.dialog = dialog
        self.params = alg.parameters
        self.horizontalLayout = QtGui.QHBoxLayout(self)
        self.horizontalLayout.setSpacing(2)
        self.horizontalLayout.setMargin(0)
        self.text = QtGui.QLineEdit()
        self.text.setSizePolicy(QtGui.QSizePolicy.Expanding,
                                QtGui.QSizePolicy.Expanding)
        if self.canUseAutoExtent():
            if hasattr(self.text, 'setPlaceholderText'):
                self.text.setPlaceholderText(
                    self.tr('[Leave blank to use min covering extent]'))
        self.horizontalLayout.addWidget(self.text)
        self.pushButton = QtGui.QPushButton()
        self.pushButton.setText('...')
        self.pushButton.clicked.connect(self.buttonPushed)
        self.horizontalLayout.addWidget(self.pushButton)
        self.setLayout(self.horizontalLayout)
        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.connect(self.tool, SIGNAL('rectangleCreated()'), self.fillCoords)

    def canUseAutoExtent(self):
        for param in self.params:
            if isinstance(param, (ParameterRaster, ParameterVector)):
                return True
            if isinstance(param, ParameterMultipleInput):
                return True

        return False

    def buttonPushed(self):
        popupmenu = QMenu()
        useLayerExtentAction = QtGui.QAction(self.tr('Use layer/canvas extent'),
                self.pushButton)
        useLayerExtentAction.triggered.connect(self.useLayerExtent)
        popupmenu.addAction(useLayerExtentAction)
        selectOnCanvasAction = QtGui.QAction(self.tr('Select extent on canvas'),
                self.pushButton)
        selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
        popupmenu.addAction(selectOnCanvasAction)
        if self.canUseAutoExtent():
            useMincoveringExtentAction = \
                QtGui.QAction(self.tr('Use min covering extent from input layers'),
                              self.pushButton)
            useMincoveringExtentAction.triggered.connect(
                    self.useMinCoveringExtent)
            popupmenu.addAction(useMincoveringExtentAction)

        popupmenu.exec_(QtGui.QCursor.pos())

    def useMinCoveringExtent(self):
        self.text.setText('')

    def getMinCoveringExtent(self):
        first = True
        found = False
        for param in self.params:
            if param.value:
                if isinstance(param, (ParameterRaster, ParameterVector)):
                    if isinstance(param.value, (QgsRasterLayer,
                                  QgsVectorLayer)):
                        layer = param.value
                    else:
                        layer = dataobjects.getObjectFromUri(param.value)
                    if layer:
                        found = True
                        self.addToRegion(layer, first)
                        first = False
                elif isinstance(param, ParameterMultipleInput):
                    layers = param.value.split(';')
                    for layername in layers:
                        layer = dataobjects.getObjectFromUri(layername, first)
                        if layer:
                            found = True
                            self.addToRegion(layer, first)
                            first = False
        if found:
            return str(self.xmin) + ',' + str(self.xmax) + ',' \
                + str(self.ymin) + ',' + str(self.ymax)
        else:
            return None

    def useNewAlg(self, alg):
        self.params = alg.parameters

    def addToRegion(self, layer, first):
        if first:
            self.xmin = layer.extent().xMinimum()
            self.xmax = layer.extent().xMaximum()
            self.ymin = layer.extent().yMinimum()
            self.ymax = layer.extent().yMaximum()
        else:
            self.xmin = min(self.xmin, layer.extent().xMinimum())
            self.xmax = max(self.xmax, layer.extent().xMaximum())
#.........这里部分代码省略.........

class BboxWidget(BASE, WIDGET):

    def __init__(self, parent=None):
        super(BboxWidget, self).__init__(parent)
        self.setupUi(self)

        self.dialog = None

        self.btnSelect.clicked.connect(self.selectExtent)

        canvas = iface.mapCanvas()
        self.prevMapTool = canvas.mapTool()
        self.tool = RectangleMapTool(canvas)
        self.tool.rectangleCreated.connect(self.updateExtent)

    def setDialog(self):
        self._dialog = Dialog

    def selectExtent(self):
        popupmenu = QMenu()
        useLayerExtentAction = QAction(
            self.tr('Use layer/canvas extent'), self.btnSelect)
        selectOnCanvasAction = QAction(
            self.tr('Select extent on canvas'), self.btnSelect)

        popupmenu.addAction(useLayerExtentAction)
        popupmenu.addAction(selectOnCanvasAction)

        selectOnCanvasAction.triggered.connect(self.selectOnCanvas)
        useLayerExtentAction.triggered.connect(self.useLayerExtent)

        popupmenu.exec_(QCursor.pos())

    def useLayerExtent(self):
        CANVAS_KEY = 'Use canvas extent'
        extentsDict = {}
        extentsDict[CANVAS_KEY] = {"extent": iface.mapCanvas().extent(),
                                   "authid": iface.mapCanvas().mapSettings().destinationCrs().authid()}
        extents = [CANVAS_KEY]
        for layer in QgsProject.instance().mapLayers().values():
            authid = layer.crs().authid()
            layerName = layer.name()
            extents.append(layerName)
            extentsDict[layerName] = {"extent": layer.extent(), "authid": authid}
        (item, ok) = QInputDialog.getItem(self, self.tr('Select extent'),
                                          self.tr('Use extent from'), extents, False)
        if ok:
            self.setValue(extentsDict[item]["extent"], extentsDict[item]['authid'])

    def selectOnCanvas(self):
        canvas = iface.mapCanvas()
        canvas.setMapTool(self.tool)
        if self.dialog:
            self.dialog.showMinimized()

    def updateExtent(self):
        self.setValue(self.tool.rectangle(),
                      iface.mapCanvas().mapSettings().destinationCrs().authid())

        self.tool.reset()
        canvas = iface.mapCanvas()
        canvas.setMapTool(self.prevMapTool)
        if self.dialog:
            self.dialog.showNormal()
            self.dialog.raise_()
            self.dialog.activateWindow()

    def setValue(self, value, crs_authid):
        if isinstance(value, QgsRectangle):
            s = '{},{},{},{}'.format(value.xMinimum(),
                                         value.yMinimum(),
                                         value.xMaximum(),
                                         value.yMaximum())
        elif isinstance(value, str):
            s = value
        else:
            s = ",".join([str(v) for v in value])

        s = '{},{}'.format(s, crs_authid)

        self.leText.setText(s)
        return True

    def value(self):
        return self.leText.text()

    def rectangle(self):
        if self.value() == '':
            return None
        xmin, ymin, xmax, ymax = [float(x) for x in self.value().split(',')[0:4]]
        return QgsRectangle(xmin, ymin, xmax, ymax)

    def crs(self):
        if self.value() == '':
            return None
        return QgsCoordinateReferenceSystem(self.value().split(',')[4])

    def isValid(self):
        try:
            rect = self.rectangle()
#.........这里部分代码省略.........