# -*- coding: utf-8 -*- """ *************************************************************************** FieldsCalculatorDialog.py --------------------- Date : October 2013 Copyright : (C) 2013 by Alexander Bruy Email : alexander dot bruy at gmail dot com *************************************************************************** * * * This program is free software; you can redistribute it and/or modify * * it under the terms of the GNU General Public License as published by * * the Free Software Foundation; either version 2 of the License, or * * (at your option) any later version. * * * *************************************************************************** """ __author__ = 'Alexander Bruy' __date__ = 'October 2013' __copyright__ = '(C) 2013, Alexander Bruy' # This will get replaced with a git SHA1 when you do a git archive __revision__ = '$Format:%H$' import os import re from qgis.PyQt import uic from qgis.PyQt.QtCore import Qt from qgis.PyQt.QtWidgets import QDialog, QFileDialog, QApplication, QMessageBox from qgis.PyQt.QtGui import QCursor from qgis.core import (Qgis, QgsExpressionContextUtils, QgsProcessingFeedback, QgsSettings, QgsMapLayerProxyModel, QgsProperty, QgsProject, QgsMessageLog, QgsProcessingOutputLayerDefinition) from qgis.gui import QgsEncodingFileDialog from qgis.utils import OverrideCursor from processing.core.ProcessingConfig import ProcessingConfig from processing.core.ProcessingLog import ProcessingLog from processing.gui.AlgorithmExecutor import execute from processing.tools import dataobjects from processing.gui.Postprocessing import handleAlgorithmResults from processing.gui.PostgisTableSelector import PostgisTableSelector from processing.gui.ParameterGuiUtils import getFileFilter pluginPath = os.path.dirname(__file__) WIDGET, BASE = uic.loadUiType( os.path.join(pluginPath, 'DlgFieldsCalculator.ui')) class FieldCalculatorFeedback(QgsProcessingFeedback): """ Directs algorithm feedback to an algorithm dialog """ def __init__(self, dialog): QgsProcessingFeedback.__init__(self) self.dialog = dialog def reportError(self, msg): self.dialog.error(msg) class FieldsCalculatorDialog(BASE, WIDGET): def __init__(self, alg): super(FieldsCalculatorDialog, self).__init__(None) self.setupUi(self) self.executed = False self._wasExecuted = False self.alg = alg self.layer = None self.cmbInputLayer.setFilters(QgsMapLayerProxyModel.VectorLayer) self.cmbInputLayer.layerChanged.connect(self.updateLayer) self.btnBrowse.clicked.connect(self.selectFile) self.mNewFieldGroupBox.toggled.connect(self.toggleExistingGroup) self.mUpdateExistingGroupBox.toggled.connect(self.toggleNewGroup) self.mOutputFieldTypeComboBox.currentIndexChanged.connect(self.setupSpinboxes) # Default values for field width and precision self.mOutputFieldWidthSpinBox.setValue(10) self.mOutputFieldPrecisionSpinBox.setValue(3) # Output is a shapefile, so limit maximum field name length self.mOutputFieldNameLineEdit.setMaxLength(10) self.manageGui() def manageGui(self): if hasattr(self.leOutputFile, 'setPlaceholderText'): self.leOutputFile.setPlaceholderText( self.tr('[Save to temporary file]')) self.mOutputFieldTypeComboBox.blockSignals(True) for t in self.alg.type_names: self.mOutputFieldTypeComboBox.addItem(t) self.mOutputFieldTypeComboBox.blockSignals(False) self.builder.loadRecent('fieldcalc') self.updateLayer(self.cmbInputLayer.currentLayer()) def initContext(self): exp_context = self.builder.expressionContext() exp_context.appendScopes(QgsExpressionContextUtils.globalProjectLayerScopes(self.layer)) exp_context.lastScope().setVariable("row_number", 1) exp_context.setHighlightedVariables(["row_number"]) self.builder.setExpressionContext(exp_context) def updateLayer(self, layer): self.layer = layer self.builder.setLayer(self.layer) self.initContext() self.populateFields() def setupSpinboxes(self, index): if index != 0: self.mOutputFieldPrecisionSpinBox.setEnabled(False) else: self.mOutputFieldPrecisionSpinBox.setEnabled(True) if index == 0: self.mOutputFieldWidthSpinBox.setRange(1, 20) self.mOutputFieldWidthSpinBox.setValue(10) self.mOutputFieldPrecisionSpinBox.setRange(0, 15) self.mOutputFieldPrecisionSpinBox.setValue(3) elif index == 1: self.mOutputFieldWidthSpinBox.setRange(1, 10) self.mOutputFieldWidthSpinBox.setValue(10) elif index == 2: self.mOutputFieldWidthSpinBox.setRange(1, 255) self.mOutputFieldWidthSpinBox.setValue(80) else: self.mOutputFieldWidthSpinBox.setEnabled(False) self.mOutputFieldPrecisionSpinBox.setEnabled(False) def selectFile(self): output = self.alg.parameterDefinition('OUTPUT') fileFilter = getFileFilter(output) settings = QgsSettings() if settings.contains('/Processing/LastOutputPath'): path = settings.value('/Processing/LastOutputPath') else: path = ProcessingConfig.getSetting(ProcessingConfig.OUTPUT_FOLDER) lastEncoding = settings.value('/Processing/encoding', 'System') fileDialog = QgsEncodingFileDialog(self, self.tr('Save file'), path, fileFilter, lastEncoding) fileDialog.setFileMode(QFileDialog.AnyFile) fileDialog.setAcceptMode(QFileDialog.AcceptSave) fileDialog.setOption(QFileDialog.DontConfirmOverwrite, False) if fileDialog.exec_() == QDialog.Accepted: files = fileDialog.selectedFiles() encoding = str(fileDialog.encoding()) output.encoding = encoding filename = str(files[0]) selectedFileFilter = str(fileDialog.selectedNameFilter()) if not filename.lower().endswith( tuple(re.findall("\\*(\\.[a-z]{1,10})", fileFilter))): ext = re.search("\\*(\\.[a-z]{1,10})", selectedFileFilter) if ext: filename = filename + ext.group(1) self.leOutputFile.setText(filename) settings.setValue('/Processing/LastOutputPath', os.path.dirname(filename)) settings.setValue('/Processing/encoding', encoding) def toggleExistingGroup(self, toggled): self.mUpdateExistingGroupBox.setChecked(not toggled) def toggleNewGroup(self, toggled): self.mNewFieldGroupBox.setChecked(not toggled) def populateFields(self): if self.layer is None: return self.mExistingFieldComboBox.clear() fields = self.layer.fields() for f in fields: self.mExistingFieldComboBox.addItem(f.name()) def getParamValues(self): if self.mUpdateExistingGroupBox.isChecked(): fieldName = self.mExistingFieldComboBox.currentText() else: fieldName = self.mOutputFieldNameLineEdit.text() layer = self.cmbInputLayer.currentLayer() context = dataobjects.createContext() parameters = {} parameters['INPUT'] = layer parameters['FIELD_NAME'] = fieldName parameters['FIELD_TYPE'] = self.mOutputFieldTypeComboBox.currentIndex() parameters['FIELD_LENGTH'] = self.mOutputFieldWidthSpinBox.value() parameters['FIELD_PRECISION'] = self.mOutputFieldPrecisionSpinBox.value() parameters['NEW_FIELD'] = self.mNewFieldGroupBox.isChecked() parameters['FORMULA'] = self.builder.expressionText() output = QgsProcessingOutputLayerDefinition() if self.leOutputFile.text().strip(): output.sink = QgsProperty.fromValue(self.leOutputFile.text().strip()) else: output.sink = QgsProperty.fromValue('memory:') output.destinationProject = context.project() parameters['OUTPUT'] = output ok, msg = self.alg.checkParameterValues(parameters, context) if not ok: QMessageBox.warning( self, self.tr('Unable to execute algorithm'), msg) return {} return parameters def accept(self): keepOpen = ProcessingConfig.getSetting(ProcessingConfig.KEEP_DIALOG_OPEN) parameters = self.getParamValues() if parameters: with OverrideCursor(Qt.WaitCursor): self.feedback = FieldCalculatorFeedback(self) self.feedback.progressChanged.connect(self.setPercentage) context = dataobjects.createContext() ProcessingLog.addToLog(self.alg.asPythonCommand(parameters, context)) self.executed, results = execute(self.alg, parameters, context, self.feedback) self.setPercentage(0) if self.executed: handleAlgorithmResults(self.alg, context, self.feedback, not keepOpen) self._wasExecuted = self.executed or self._wasExecuted if not keepOpen: QDialog.reject(self) def reject(self): self.executed = False QDialog.reject(self) def setPercentage(self, i): self.progressBar.setValue(i) def error(self, text): QMessageBox.critical(self, "Error", text) QgsMessageLog.logMessage(text, self.tr('Processing'), Qgis.Critical) def wasExecuted(self): return self._wasExecuted