Python Loader.stop方法代码示例

# 需要导入模块: from loader import Loader [as 别名]
# 或者: from loader.Loader import stop [as 别名]

#.........这里部分代码省略.........
    def layerControl(self):
        if len(self.allVectorLayers) > 1:
            self.targetLayer = self.allVectorLayers[self.dlg.cmbTargetLayer.currentIndex()]
            sourceLayer = self.allVectorLayers[self.dlg.cmbSourceLayer.currentIndex()]

            openedAttrWindow = False #This variable is used for detecting opened attribute windows. During loading operation, opened windows make qgis crashed (maybe a bug)
            #so they must be closed
            for dialog in QApplication.instance().allWidgets():
                #I noticed that in my laptop getting all Qt widget's (in QGIS) names give error. But no problem with desktop. Here is try-except ;)
                try:
                    if dialog.objectName() in [u'QgsAttributeTableDialog', u'AttributeTable']:
                        openedAttrWindow = True
                except:
                    pass

            if openedAttrWindow:
                QMessageBox.warning(None,u'Notification', u'Please close all attribute windows to start the process.')

            else:
                #checking target and source layers must not be in editing mode.
                if not self.targetLayer.isEditable() and not sourceLayer.isEditable():
                    # checking for targetLayer editing capability.
                    isEditable = self.targetLayer.dataProvider().capabilities() & QgsVectorDataProvider.AddFeatures
                    if isEditable:
                        # checking targetLayer and sourceLayer are not same
                        if self.targetLayer.extent() != sourceLayer.extent() or self.targetLayer.publicSource() != sourceLayer.publicSource():
                            # checking layers geometry types
                            if self.targetLayer.geometryType() == sourceLayer.geometryType():
                                self.loader = Loader(targetLayer=self.targetLayer,sourceLayer=sourceLayer)
                                self.loader.setOptions(onlySelected=self.dlg.checkBox.isChecked())

                                self.dlg.btnStart.setEnabled(False)
                                self.dlg.btnStop.setEnabled(True)
                                self.dlg.btnStop.clicked.connect(self.loader.stop)
                                self.iface.mapCanvas().setRenderFlag(False)#QGIS can not render dramatic changes in the target layer feature count and crashes down. So before starting we need to stop rendering.

                                QObject.connect(self.loader, SIGNAL("progressLenght"), self.setProgressLength)
                                QObject.connect(self.loader, SIGNAL("progress"), self.setProgress)
                                QObject.connect(self.loader, SIGNAL("error"), self.error)
                                QObject.connect(self.loader, SIGNAL("finished()"), self.done)
                                QObject.connect(self.loader, SIGNAL('status'), self.setStatus)
                                # QObject.connect(self.loader, SIGNAL('insertFeature'), self.insert)
                                self.loader.start()
                                self.start_time = timeit.default_timer()#for calculating total run time

                            else:
                                QMessageBox.warning(self.dlg, u'Error',
                                                     u'The layers geometry types have to be same to start the process.')
                        else:
                            QMessageBox.warning(self.dlg, u'Error', u'Target Layer and Source Layer must be different.')
                    else:
                        QMessageBox.warning(self.dlg, u'Error', u'Target Layer does not support editing.')
                else:
                    QMessageBox.warning(self.dlg, u'Error', u'Target Layer and Source Layer must not be in editing mode.')
        else:
            QMessageBox.warning(self.dlg, u'Error', u'There must be at least two vector layers added in QGIS canvas.')

    def setProgress(self, val):
        self.dlg.progressBar.setValue(val)

    def setProgressLength(self, val):
        self.dlg.progressBar.setMaximum(val)
        if val==0:
            self.dlg.btnStop.setEnabled(False)#this control may prevent errors when clicking stop button during saving changes.

    # def insert(self,feat):

# 需要导入模块: from loader import Loader [as 别名]
# 或者: from loader.Loader import stop [as 别名]

#.........这里部分代码省略.........
        """Generate the context menu entries and toolbar icons inside the QGIS GUI."""

        icon_path = ':/plugins/SpeedyLayer/icon.png'
        self.add_action(
            icon_path,
            text=self.tr(u'Speedy Layer'),
            callback=self.run,
            parent=self.iface.mainWindow())
        #add contextual menu
        self.dup_to_memory_layer_action = QAction(QIcon(icon_path), "Duplicate to memory layer", self.iface.legendInterface() )
        self.iface.legendInterface().addLegendLayerAction(self.dup_to_memory_layer_action, "","01", QgsMapLayer.VectorLayer,True)
        self.dup_to_memory_layer_action.triggered.connect(self.run)

    def unload(self):
        """Removes the plugin menu item and icon from QGIS GUI."""
        for action in self.actions:
            self.iface.removePluginMenu(
                self.tr(u'&Speedy Layer'),
                action)
            self.iface.removeToolBarIcon(action)
        # remove the toolbar
        del self.toolbar
        # remove contextual menu
        self.iface.legendInterface().removeLegendLayerAction(self.dup_to_memory_layer_action)

    def process(self):
        if len(self.allVectorLayers) > 0:
            self.vectorLayer = self.allVectorLayers[self.dlg.cmbVectorLayer.currentIndex()]
            self.memoryLayer = self.generateMemoryLayer(self.vectorLayer,self.selectedLayerFields)
            self.loader = Loader(targetLayer=self.memoryLayer,sourceLayer=self.vectorLayer)
            self.loader.setOptions(onlySelected=self.dlg.checkBox.isChecked())
            self.dlg.btnStart.setEnabled(False)
            self.dlg.btnStop.setEnabled(True)
            self.dlg.btnStop.clicked.connect(self.loader.stop)
            self.iface.mapCanvas().setRenderFlag(False)#QGIS can not render dramatic changes in the target layer feature count and crashes down. So before starting we need to stop rendering.

            QObject.connect(self.loader, SIGNAL("progressLenght"), self.setProgressLength)
            QObject.connect(self.loader, SIGNAL("progress"), self.setProgress)
            QObject.connect(self.loader, SIGNAL("error"), self.error)
            QObject.connect(self.loader, SIGNAL("finished()"), self.done)
            QObject.connect(self.loader, SIGNAL('status'), self.setStatus)
            # QObject.connect(self.loader, SIGNAL('debug'), self.debug)
            self.loader.start()

        else:
            QMessageBox.warning(self.dlg, u'Error', u'There must be at least one vector layers added in QGIS canvas.')

    # def debug(self,msg):
    #     QMessageBox.information(None,'debug',msg)

    def setProgress(self, val):
        self.dlg.progressBar.setValue(val)

    def setProgressLength(self, val):
        self.dlg.progressBar.setMaximum(val)
        if val==0:
            self.dlg.btnStop.setEnabled(False)#this control may prevent errors when clicking stop button during saving changes.

    def error(self, exception):
        QMessageBox.critical(self.dlg, 'Error', str(exception) + '. All changes were rollbacked.')

    def done(self):
        #this function is used by loader class's finished() signal.
        if not self.loader.hasError:
            if not self.loader.isCancel:
                QgsMapLayerRegistry.instance().addMapLayer(self.memoryLayer)