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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
257 lines
11 KiB
Python
257 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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AlgorithmDialog.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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from builtins import range
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.PyQt.QtCore import Qt
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from qgis.PyQt.QtWidgets import QMessageBox, QApplication, QPushButton, QWidget, QVBoxLayout, QSizePolicy
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from qgis.PyQt.QtGui import QCursor, QColor, QPalette
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from qgis.core import (QgsProject,
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QgsProcessingUtils)
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from qgis.gui import QgsMessageBar
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from qgis.utils import iface
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from processing.core.ProcessingLog import ProcessingLog
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from processing.core.ProcessingConfig import ProcessingConfig
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from processing.gui.BatchAlgorithmDialog import BatchAlgorithmDialog
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from processing.gui.AlgorithmDialogBase import AlgorithmDialogBase
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from processing.gui.AlgorithmExecutor import execute, executeIterating
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from processing.gui.Postprocessing import handleAlgorithmResults
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from processing.core.parameters import ParameterRaster
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterExtent
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from processing.core.parameters import ParameterMultipleInput
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from processing.core.outputs import OutputRaster
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from processing.core.outputs import OutputVector
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from processing.core.outputs import OutputTable
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from processing.tools import dataobjects
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class AlgorithmDialog(AlgorithmDialogBase):
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def __init__(self, alg):
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AlgorithmDialogBase.__init__(self, alg)
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self.alg = alg
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self.setMainWidget(alg.getParametersPanel(self))
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self.bar = QgsMessageBar()
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self.bar.setSizePolicy(QSizePolicy.Minimum, QSizePolicy.Fixed)
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self.layout().insertWidget(0, self.bar)
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self.cornerWidget = QWidget()
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layout = QVBoxLayout()
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layout.setContentsMargins(0, 0, 0, 5)
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self.tabWidget.setStyleSheet("QTabBar::tab { height: 30px; }")
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self.runAsBatchButton = QPushButton(self.tr("Run as batch process..."))
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self.runAsBatchButton.clicked.connect(self.runAsBatch)
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layout.addWidget(self.runAsBatchButton)
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self.cornerWidget.setLayout(layout)
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self.tabWidget.setCornerWidget(self.cornerWidget)
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def runAsBatch(self):
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self.close()
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dlg = BatchAlgorithmDialog(self.alg)
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dlg.show()
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dlg.exec_()
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def setParamValues(self):
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params = self.alg.parameters
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outputs = self.alg.outputs
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for param in params:
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if param.hidden:
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continue
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wrapper = self.mainWidget.wrappers[param.name]
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if not self.setParamValue(param, wrapper):
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raise AlgorithmDialogBase.InvalidParameterValue(param, wrapper.widget)
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for output in outputs:
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if output.hidden:
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continue
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output.value = self.mainWidget.outputWidgets[output.name].getValue()
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if isinstance(output, (OutputRaster, OutputVector, OutputTable)):
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output.open = self.mainWidget.checkBoxes[output.name].isChecked()
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return True
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def setParamValue(self, param, wrapper):
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if wrapper.widget:
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return param.setValue(wrapper.value())
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else:
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return True
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def checkExtentCRS(self):
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unmatchingCRS = False
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hasExtent = False
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context = dataobjects.createContext()
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projectCRS = iface.mapCanvas().mapSettings().destinationCrs()
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layers = QgsProcessingUtils.compatibleLayers(QgsProject.instance())
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for param in self.alg.parameters:
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if isinstance(param, (ParameterRaster, ParameterVector, ParameterMultipleInput)):
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if param.value:
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if isinstance(param, ParameterMultipleInput):
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inputlayers = param.value.split(';')
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else:
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inputlayers = [param.value]
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for inputlayer in inputlayers:
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for layer in layers:
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if layer.source() == inputlayer:
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if layer.crs() != projectCRS:
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unmatchingCRS = True
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p = dataobjects.QgsProcessingUtils.mapLayerFromString(inputlayer, context)
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if p is not None:
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if p.crs() != projectCRS:
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unmatchingCRS = True
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if isinstance(param, ParameterExtent):
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if param.skip_crs_check:
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continue
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value = self.mainWidget.wrappers[param.name].widget.leText.text().strip()
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if value:
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hasExtent = True
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return hasExtent and unmatchingCRS
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def accept(self):
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self.settings.setValue("/Processing/dialogBase", self.saveGeometry())
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checkCRS = ProcessingConfig.getSetting(ProcessingConfig.WARN_UNMATCHING_CRS)
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try:
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self.setParamValues()
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if checkCRS and not self.alg.checkInputCRS():
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reply = QMessageBox.question(self, self.tr("Unmatching CRS's"),
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self.tr('Layers do not all use the same CRS. This can '
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'cause unexpected results.\nDo you want to '
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'continue?'),
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QMessageBox.Yes | QMessageBox.No,
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QMessageBox.No)
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if reply == QMessageBox.No:
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return
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checkExtentCRS = ProcessingConfig.getSetting(ProcessingConfig.WARN_UNMATCHING_EXTENT_CRS)
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if checkExtentCRS and self.checkExtentCRS():
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reply = QMessageBox.question(self, self.tr("Extent CRS"),
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self.tr('Extent parameters must use the same CRS as the input layers.\n'
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'Your input layers do not have the same extent as the project, '
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'so the extent might be in a wrong CRS if you have selected it from the canvas.\n'
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'Do you want to continue?'),
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QMessageBox.Yes | QMessageBox.No,
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QMessageBox.No)
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if reply == QMessageBox.No:
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return
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msg = self.alg._checkParameterValuesBeforeExecuting()
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if msg:
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QMessageBox.warning(
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self, self.tr('Unable to execute algorithm'), msg)
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return
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self.btnRun.setEnabled(False)
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self.btnClose.setEnabled(False)
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buttons = self.mainWidget.iterateButtons
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self.iterateParam = None
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for i in range(len(list(buttons.values()))):
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button = list(buttons.values())[i]
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if button.isChecked():
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self.iterateParam = list(buttons.keys())[i]
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break
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self.progressBar.setMaximum(0)
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self.lblProgress.setText(self.tr('Processing algorithm...'))
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# Make sure the Log tab is visible before executing the algorithm
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try:
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self.tabWidget.setCurrentIndex(1)
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self.repaint()
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except:
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pass
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QApplication.setOverrideCursor(QCursor(Qt.WaitCursor))
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self.setInfo(
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self.tr('<b>Algorithm {0} starting...</b>').format(self.alg.displayName()))
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context = dataobjects.createContext()
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if self.iterateParam:
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if executeIterating(self.alg, self.iterateParam, context, self.feedback):
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self.finish(context)
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else:
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QApplication.restoreOverrideCursor()
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self.resetGUI()
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else:
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command = self.alg.getAsCommand()
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if command:
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ProcessingLog.addToLog(command)
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if execute(self.alg, context, self.feedback):
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self.finish(context)
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else:
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QApplication.restoreOverrideCursor()
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self.resetGUI()
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except AlgorithmDialogBase.InvalidParameterValue as e:
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try:
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self.buttonBox.accepted.connect(lambda e=e:
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e.widget.setPalette(QPalette()))
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palette = e.widget.palette()
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palette.setColor(QPalette.Base, QColor(255, 255, 0))
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e.widget.setPalette(palette)
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except:
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pass
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self.bar.clearWidgets()
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self.bar.pushMessage("", self.tr("Wrong or missing parameter value: {0}").format(e.parameter.description),
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level=QgsMessageBar.WARNING, duration=5)
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def finish(self, context):
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keepOpen = ProcessingConfig.getSetting(ProcessingConfig.KEEP_DIALOG_OPEN)
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if self.iterateParam is None:
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if not handleAlgorithmResults(self.alg, context, self.feedback, not keepOpen):
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self.resetGUI()
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return
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self.executed = True
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self.setInfo(self.tr('Algorithm {0} finished').format(self.alg.displayName()))
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QApplication.restoreOverrideCursor()
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if not keepOpen:
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self.close()
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else:
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self.resetGUI()
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if self.alg.getHTMLOutputsCount() > 0:
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self.setInfo(
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self.tr('HTML output has been generated by this algorithm.'
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'\nOpen the results dialog to check it.'))
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def closeEvent(self, evt):
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QgsProject.instance().layerWasAdded.disconnect(self.mainWidget.layerRegistryChanged)
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QgsProject.instance().layersWillBeRemoved.disconnect(self.mainWidget.layerRegistryChanged)
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super(AlgorithmDialog, self).closeEvent(evt)
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