def opendefaultexpression(self):
layer = self.form.QGISLayer
dlg = QgsExpressionBuilderDialog(layer, "Create default value expression", self)
text = self.defaultvalueText.text().strip('[%').strip('%]').strip()
dlg.setExpressionText(text)
if dlg.exec_():
self.defaultvalueText.setText('[% {} %]'.format(dlg.expressionText()))
def showExpressionsBuilder(self):
context = self.param.expressionContext()
dlg = QgsExpressionBuilderDialog(None, self.leText.text(), self, 'generic', context)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def showExpressionsBuilder(self):
context = self.param.expressionContext()
dlg = QgsExpressionBuilderDialog(None, self.leText.text(), self, 'generic', context)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def showExpressionsBuilder(self):
context = self.alg.createExpressionContext({}, createContext())
dlg = QgsExpressionBuilderDialog(None, self.leText.text(), self,
'generic', context)
dlg.setWindowTitle(self.tr('Expression based output'))
if dlg.exec_() == QDialog.Accepted:
expression = QgsExpression(dlg.expressionText())
self.leText.setText(expression.evaluate(context))
def showExpressionsBuilder(self):
context = self.alg.createExpressionContext({}, createContext())
dlg = QgsExpressionBuilderDialog(None, self.leText.text(), self, 'generic',
context)
dlg.setWindowTitle(self.tr('Expression based output'))
if dlg.exec_() == QDialog.Accepted:
expression = QgsExpression(dlg.expressionText())
self.leText.setText(expression.evaluate(context))
def populateByExpression(self, adding=False):
"""
Populates the panel using an expression
"""
context = dataobjects.createContext()
expression_context = context.expressionContext()
# use the first row parameter values as a preview during expression creation
params = self.panel.parametersForRow(0, warnOnInvalid=False)
alg_scope = QgsExpressionContextUtils.processingAlgorithmScope(self.panel.alg, params, context)
# create explicit variables corresponding to every parameter
for k, v in params.items():
alg_scope.setVariable(k, v, True)
expression_context.appendScope(alg_scope)
# mark the parameter variables as highlighted for discoverability
highlighted_vars = expression_context.highlightedVariables()
highlighted_vars.extend(list(params.keys()))
expression_context.setHighlightedVariables(highlighted_vars)
dlg = QgsExpressionBuilderDialog(layer=None, context=context.expressionContext())
if adding:
dlg.setExpectedOutputFormat(self.tr('An array of values corresponding to each new row to add'))
if not dlg.exec_():
return
if adding:
exp = QgsExpression(dlg.expressionText())
res = exp.evaluate(expression_context)
if type(res) is not list:
res = [res]
first_row = self.panel.batchRowCount() if self.panel.batchRowCount() > 1 else 0
for row, value in enumerate(res):
self.setRowValue(row + first_row, value, context)
else:
for row in range(self.panel.batchRowCount()):
params = self.panel.parametersForRow(row, warnOnInvalid=False)
# remove previous algorithm scope -- we need to rebuild this completely, using the
# other parameter values from the current row
expression_context.popScope()
alg_scope = QgsExpressionContextUtils.processingAlgorithmScope(self.panel.alg, params, context)
for k, v in params.items():
alg_scope.setVariable(k, v, True)
expression_context.appendScope(alg_scope)
# rebuild a new expression every time -- we don't want the expression compiler to replace
# variables with precompiled values
exp = QgsExpression(dlg.expressionText())
value = exp.evaluate(expression_context)
self.setRowValue(row, value, context)
def define_filter(self):
layer = self.layerCombo.currentText()
if not layer:
return
layer = layer_by_name(layer)
dlg = QgsExpressionBuilderDialog(layer, "List filter", self)
text = self.filterText.toPlainText()
dlg.setExpressionText(text)
if dlg.exec_():
self.filterText.setPlainText(dlg.expressionText())
def opendefaultexpression(self):
"""
Open the default expression builder for setting default values based on QGIS Expressions.
"""
layer = self.form.QGISLayer
dlg = QgsExpressionBuilderDialog(layer, "Create default value expression", self)
text = self.defaultvalueText.text().strip('[%').strip('%]').strip()
dlg.setExpressionText(text)
if dlg.exec_():
self.defaultvalueText.setText('[% {} %]'.format(dlg.expressionText()))
def opendefaultexpression(self):
"""
Open the default expression builder for setting default values based on QGIS Expressions.
"""
layer = self.form.QGISLayer
dlg = QgsExpressionBuilderDialog(layer, "Create default value expression", self)
text = self.defaultvalueText.text().strip('[%').strip('%]').strip()
dlg.setExpressionText(text)
if dlg.exec_():
self.defaultvalueText.setText('[% {} %]'.format(dlg.expressionText()))
def opendefaultexpression_advanced(self):
"""
Open the default expression builder for setting advanced default values based on QGIS Expressions.
"""
layer = self.form.QGISLayer
dlg = QgsExpressionBuilderDialog(layer, "Create default value expression", self)
text = self.defaultValueExpression.text()
dlg.setExpressionText(text)
if dlg.exec_():
self.defaultValueExpression.setText(dlg.expressionText())
def opendefaultexpression(self):
layer = self.currentform.QGISLayer
dlg = QgsExpressionBuilderDialog(layer,
"Create default value expression",
self)
text = self.defaultvalueText.text().strip('[%').strip('%]').strip()
dlg.setExpressionText(text)
if dlg.exec_():
self.defaultvalueText.setText('[% {} %]'.format(
dlg.expressionText()))
def define_filter(self):
layer = self.layerCombo.currentText()
if not layer:
return
layer = layer_by_name(layer)
dlg = QgsExpressionBuilderDialog(layer, "List filter", self)
text = self.filterText.toPlainText()
dlg.setExpressionText(text)
if dlg.exec_():
self.filterText.setPlainText(dlg.expressionText())
def opendefaultexpression_advanced(self):
"""
Open the default expression builder for setting advanced default values based on QGIS Expressions.
"""
layer = self.form.QGISLayer
dlg = QgsExpressionBuilderDialog(layer, "Create default value expression", self)
text = self.defaultValueExpression.text()
dlg.setExpressionText(text)
if dlg.exec_():
self.defaultValueExpression.setText(dlg.expressionText())
def showExpressionsBuilder(self):
context = self.param.expressionContext()
value = self.value()
if not isinstance(value, str):
value = ''
dlg = QgsExpressionBuilderDialog(None, value, self.widget, 'generic', context)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def on_advanced_search(self):
# Slot raised to show the expression editor.
filter_col = self.cbo_column.itemData(self.cbo_column.currentIndex())
start_txt = '"{0}" = '.format(filter_col)
exp_dlg = QgsExpressionBuilderDialog(self._ds_mgr.vector_layer,
start_txt, self,
self._config.display_name)
exp_dlg.setWindowTitle('{0} Expression Editor'.format(
self._config.display_name))
if exp_dlg.exec_() == QDialog.Accepted:
exp_text = exp_dlg.expressionText()
self.exec_search(exp_text)
def showExpressionsBuilder(self):
context = self.expressionContext()
dlg = QgsExpressionBuilderDialog(None, self.spnValue.text(), self, 'generic', context)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
result = exp.evaluate(context)
if not exp.hasEvalError():
try:
self.spnValue.setValue(float(result))
except:
pass
def showExpressionsBuilder(self):
context = createExpressionContext()
dlg = QgsExpressionBuilderDialog(None, str(self.spnValue.value()), self, 'generic', context)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
try:
val = float(exp.evaluate(context))
self.setValue(val)
except:
return
def showExpressionsBuilder(self):
context = self.param.expressionContext()
dlg = QgsExpressionBuilderDialog(None, str(self.spnValue.value()), self, 'generic', context)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
try:
val = float(exp.evaluate(context))
self.setValue(val)
except:
return
def showExpressionsBuilder(self):
context = self.expressionContext()
dlg = QgsExpressionBuilderDialog(None, self.spnValue.text(), self,
'generic', context)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
result = exp.evaluate(context)
if not exp.hasEvalError():
try:
self.spnValue.setValue(float(result))
except:
pass
def showExpressionsBuilder(self):
context = createExpressionContext()
dlg = QgsExpressionBuilderDialog(None, str(self.leText.text()), self, 'generic', context)
context.popScope()
values = self.modelParametersDialog.getAvailableValuesOfType(QgsProcessingParameterNumber, QgsProcessingOutputNumber)
variables = {}
for value in values:
if isinstance(value, QgsProcessingModelAlgorithm.ChildParameterSource):
if value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ModelParameter:
name = value.parameterName()
element = self.modelParametersDialog.model.parameterDefinition(name)
desc = element.description()
elif value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ChildOutput:
name = "%s_%s" % (value.outputChildId(), value.outputName())
alg = self.modelParametersDialog.model.childAlgorithm(value.outputChildId())
out = alg.algorithm().outputDefinition(value.outputName())
desc = self.tr("Output '{0}' from algorithm '{1}'").format(out.description(), alg.description())
variables[name] = desc
values = self.modelParametersDialog.getAvailableValuesOfType([QgsProcessingParameterFeatureSource, QgsProcessingParameterRasterLayer],
[QgsProcessingOutputVectorLayer, QgsProcessingOutputRasterLayer])
for value in values:
if isinstance(value, QgsProcessingModelAlgorithm.ChildParameterSource):
if value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ModelParameter:
name = value.parameterName()
element = self.modelParametersDialog.model.parameterDefinition(name)
desc = element.description()
elif value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ChildOutput:
name = "%s_%s" % (value.outputChildId(), value.outputName())
alg = self.modelParametersDialog.model.childAlgorithm(value.outputChildId())
out = alg.algorithm().outputDefinition(value.outputName())
desc = self.tr("Output '{0}' from algorithm '{1}'").format(out.description(), alg.description())
variables['%s_minx' % name] = self.tr("Minimum X of {0}").format(desc)
variables['%s_miny' % name] = self.tr("Minimum Y of {0}").format(desc)
variables['%s_maxx' % name] = self.tr("Maximum X of {0}").format(desc)
variables['%s_maxy' % name] = self.tr("Maximum Y of {0}").format(desc)
if isinstance(element, (QgsProcessingParameterRasterLayer, QgsProcessingOutputRasterLayer)):
variables['%s_min' % name] = self.tr("Minimum value of {0}").format(desc)
variables['%s_max' % name] = self.tr("Maximum value of {0}").format(desc)
variables['%s_avg' % name] = self.tr("Mean value of {0}").format(desc)
variables['%s_stddev' % name] = self.tr("Standard deviation of {0}").format(desc)
for variable, desc in variables.items():
dlg.expressionBuilder().registerItem("Modeler", variable, "@" + variable, desc, highlightedItem=True)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def showExpressionsBuilder(self):
context = createExpressionContext()
dlg = QgsExpressionBuilderDialog(None, str(self.leText.text()), self, 'generic', context)
context.popScope()
values = self.modelParametersDialog.getAvailableValuesOfType(QgsProcessingParameterNumber, QgsProcessingOutputNumber)
variables = {}
for value in values:
if isinstance(value, QgsProcessingModelAlgorithm.ChildParameterSource):
if value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ModelParameter:
name = value.parameterName()
element = self.modelParametersDialog.model.parameterDefinition(name)
desc = element.description()
elif value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ChildOutput:
name = "%s_%s" % (value.outputChildId(), value.outputName())
alg = self.modelParametersDialog.model.childAlgorithm(value.outputChildId())
out = alg.algorithm().outputDefinition(value.outputName())
desc = self.tr("Output '{0}' from algorithm '{1}'").format(out.description(), alg.description())
variables[name] = desc
values = self.modelParametersDialog.getAvailableValuesOfType([QgsProcessingParameterFeatureSource, QgsProcessingParameterRasterLayer],
[QgsProcessingOutputVectorLayer, QgsProcessingOutputRasterLayer])
for value in values:
if isinstance(value, QgsProcessingModelAlgorithm.ChildParameterSource):
if value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ModelParameter:
name = value.parameterName()
element = self.modelParametersDialog.model.parameterDefinition(name)
desc = element.description()
elif value.source() == QgsProcessingModelAlgorithm.ChildParameterSource.ChildOutput:
name = "%s_%s" % (value.outputChildId(), value.outputName())
alg = self.modelParametersDialog.model.childAlgorithm(value.outputChildId())
out = alg.algorithm().outputDefinition(value.outputName())
desc = self.tr("Output '{0}' from algorithm '{1}'").format(out.description(), alg.description())
variables['%s_minx' % name] = self.tr("Minimum X of {0}").format(desc)
variables['%s_miny' % name] = self.tr("Minimum Y of {0}").format(desc)
variables['%s_maxx' % name] = self.tr("Maximum X of {0}").format(desc)
variables['%s_maxy' % name] = self.tr("Maximum Y of {0}").format(desc)
if isinstance(element, (QgsProcessingParameterRasterLayer, QgsProcessingOutputRasterLayer)):
variables['%s_min' % name] = self.tr("Minimum value of {0}").format(desc)
variables['%s_max' % name] = self.tr("Maximum value of {0}").format(desc)
variables['%s_avg' % name] = self.tr("Mean value of {0}").format(desc)
variables['%s_stddev' % name] = self.tr("Standard deviation of {0}").format(desc)
for variable, desc in variables.items():
dlg.expressionBuilder().registerItem("Modeler", variable, "@" + variable, desc, highlightedItem=True)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def showExpressionsBuilder(self):
context = createExpressionContext()
processing_context = createContext()
scope = self.modelParametersDialog.model.createExpressionContextScopeForChildAlgorithm(self.modelParametersDialog.childId, processing_context)
context.appendScope(scope)
highlighted = scope.variableNames()
context.setHighlightedVariables(highlighted)
dlg = QgsExpressionBuilderDialog(None, str(self.leText.text()), self, 'generic', context)
dlg.setWindowTitle(self.tr('Expression Based Input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def showExpressionsBuilder(self):
context = createExpressionContext()
processing_context = createContext()
scope = self.modelParametersDialog.model.createExpressionContextScopeForChildAlgorithm(self.modelParametersDialog.childId, processing_context)
context.appendScope(scope)
highlighted = scope.variableNames()
context.setHighlightedVariables(highlighted)
dlg = QgsExpressionBuilderDialog(None, str(self.leText.text()), self, 'generic', context)
dlg.setWindowTitle(self.tr('Expression Based Input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def showExpressionsBuilder(self):
context = self.param.expressionContext()
dlg = QgsExpressionBuilderDialog(None, str(self.leText.text()), self, 'generic', context)
context.popScope()
values = self.modelParametersDialog.getAvailableValuesOfType(ParameterNumber, OutputNumber)
variables = {}
for value in values:
if isinstance(value, ValueFromInput):
name = value.name
element = self.modelParametersDialog.model.inputs[name].param
desc = element.description
else:
name = "%s_%s" % (value.alg, value.output)
alg = self.modelParametersDialog.model.algs[value.alg]
out = alg.algorithm.getOutputFromName(value.output)
desc = "Output '%s' from algorithm '%s" % (out.description, alg.description)
variables[name] = desc
values = self.modelParametersDialog.getAvailableValuesOfType(ParameterVector, OutputVector)
values.extend(self.modelParametersDialog.getAvailableValuesOfType(ParameterRaster, OutputRaster))
for value in values:
if isinstance(value, ValueFromInput):
name = value.name
element = self.modelParametersDialog.model.inputs[name].param
desc = element.description
else:
name = "%s_%s" % (value.alg, value.output)
alg = self.modelParametersDialog.model.algs[value.alg]
element = alg.algorithm.getOutputFromName(value.output)
desc = "Output '%s' from algorithm '%s" % (element.description, alg.description)
variables['%s_minx' % name] = "Minimum X of %s" % desc
variables['%s_miny' % name] = "Maximum X of %s" % desc
variables['%s_maxx' % name] = "Minimum Y of %s" % desc
variables['%s_maxy' % name] = "Maximum Y of %s" % desc
if isinstance(element, (ParameterRaster, OutputRaster)):
variables['%s_min' % name] = "Minimum value of %s" % desc
variables['%s_max' % name] = "Maximum value of %s" % desc
variables['%s_avg' % name] = "Mean value of %s" % desc
variables['%s_stddev' % name] = "Standard deviation of %s" % desc
for variable, desc in variables.items():
dlg.expressionBuilder().registerItem("Modeler", variable, "@" + variable, desc, highlightedItem=True)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def showExpressionsBuilder(self):
context = self.param.expressionContext()
dlg = QgsExpressionBuilderDialog(None, str(self.leText.text()), self, 'generic', context)
context.popScope()
values = self.modelParametersDialog.getAvailableValuesOfType(ParameterNumber, OutputNumber)
variables = {}
for value in values:
if isinstance(value, ValueFromInput):
name = value.name
element = self.modelParametersDialog.model.inputs[name].param
desc = element.description
else:
name = "%s_%s" % (value.alg, value.output)
alg = self.modelParametersDialog.model.algs[value.alg]
out = alg.algorithm.getOutputFromName(value.output)
desc = self.tr("Output '{0}' from algorithm '{1}'").format(out.description, alg.description)
variables[name] = desc
values = self.modelParametersDialog.getAvailableValuesOfType(ParameterVector, OutputVector)
values.extend(self.modelParametersDialog.getAvailableValuesOfType(ParameterRaster, OutputRaster))
for value in values:
if isinstance(value, ValueFromInput):
name = value.name
element = self.modelParametersDialog.model.inputs[name].param
desc = element.description
else:
name = "%s_%s" % (value.alg, value.output)
alg = self.modelParametersDialog.model.algs[value.alg]
element = alg.algorithm.getOutputFromName(value.output)
desc = self.tr("Output '{0}' from algorithm '{1}'").format(element.description, alg.description)
variables['%s_minx' % name] = self.tr("Minimum X of {0}").format(desc)
variables['%s_miny' % name] = self.tr("Minimum Y of {0}").format(desc)
variables['%s_maxx' % name] = self.tr("Maximum X of {0}").format(desc)
variables['%s_maxy' % name] = self.tr("Maximum Y of {0}").format(desc)
if isinstance(element, (ParameterRaster, OutputRaster)):
variables['%s_min' % name] = self.tr("Minimum value of {0}").format(desc)
variables['%s_max' % name] = self.tr("Maximum value of {0}").format(desc)
variables['%s_avg' % name] = self.tr("Mean value of {0}").format(desc)
variables['%s_stddev' % name] = self.tr("Standard deviation of {0}").format(desc)
for variable, desc in variables.items():
dlg.expressionBuilder().registerItem("Modeler", variable, "@" + variable, desc, highlightedItem=True)
dlg.setWindowTitle(self.tr('Expression based input'))
if dlg.exec_() == QDialog.Accepted:
exp = QgsExpression(dlg.expressionText())
if not exp.hasParserError():
self.setValue(dlg.expressionText())
def on_mAtlasFeatureFilterButton_clicked(self):
atlasMap = self.mComposition.atlasComposition()
vl = self.mAtlasCoverageLayerComboBox.currentLayer()
if (not atlasMap or not vl):
return
# QScopedPointer<QgsExpressionContext> context( mComposition.createExpressionContext() );
exprDlg = QgsExpressionBuilderDialog(
vl, self.mAtlasFeatureFilterEdit.text(), self, "generic")
exprDlg.setWindowTitle("Expression based filter")
if (exprDlg.exec_() == QtGui.QDialog.Accepted):
expression = exprDlg.expressionText()
if (not expression.isEmpty()):
self.mAtlasFeatureFilterEdit.setText(expression)
atlasMap.setFeatureFilter(self.mAtlasFeatureFilterEdit.text())
self.updateAtlasFeatures()
class ExpressionFieldCombo(FieldCombo):
def __init__(self,
widget,
expressionWidget,
vectorLayerCombo,
initField="",
options={}):
FieldCombo.__init__(self, widget, vectorLayerCombo, initField, options)
expressionWidget.clicked.connect(self.editExpression)
self.windowTitle = "Expression based label"
def editExpression(self):
expr = ""
if self.widget.currentIndex() >= self.nFields:
expr = self.widget.currentText()
self.exprDlg = QgsExpressionBuilderDialog(self.layer, expr)
self.exprDlg.setWindowTitle(self.windowTitle)
if self.exprDlg.exec_() == QDialog.Accepted:
expression = self.exprDlg.expressionText()
self.addExpression(expression)
def getExpression(self):
if self.widget.currentIndex() < 0:
return None, None
if self.widget.currentIndex() <= self.nFields - 1:
return self.getFieldName(), False
else:
return self.widget.currentText(), True
def setExpression(self, expr):
if self.setField(expr) != -1:
return
self.addExpression(expr)
def addExpression(self, expr):
# Only add the expression if the user has entered some text.
if expr != "":
self.widget.addItem(expr)
self.widget.setCurrentIndex(self.widget.count() - 1)
class ExpressionFieldCombo(FieldCombo):
def __init__(self, widget, expressionWidget, vectorLayerCombo, initField="", options={}):
FieldCombo.__init__(self, widget, vectorLayerCombo, initField, options)
expressionWidget.clicked.connect(self.editExpression)
self.windowTitle = "Expression based label"
def editExpression(self):
expr = ""
if self.widget.currentIndex() >= self.nFields:
expr = self.widget.currentText()
self.exprDlg = QgsExpressionBuilderDialog(self.layer, expr)
self.exprDlg.setWindowTitle(self.windowTitle)
if self.exprDlg.exec_() == QDialog.Accepted:
expression = self.exprDlg.expressionText()
self.addExpression(expression)
def getExpression(self):
if self.widget.currentIndex() < 0:
return None,None
if self.widget.currentIndex() <= self.nFields-1:
return self.getFieldName(), False
else:
return self.widget.currentText(), True
def setExpression(self, expr):
if self.setField(expr) != -1:
return
self.addExpression(expr)
def addExpression(self, expr):
# Only add the expression if the user has entered some text.
if expr != "":
self.widget.addItem(expr)
self.widget.setCurrentIndex(self.widget.count() - 1)
def on_mAtlasFilenameExpressionButton_clicked(self):
atlasMap = self.mComposition.atlasComposition()
if (not atlasMap or not atlasMap.coverageLayer()):
return
# QScopedPointer<QgsExpressionContext> context( mComposition.createExpressionContext() );
exprDlg = QgsExpressionBuilderDialog(
atlasMap.coverageLayer(), self.mAtlasFilenamePatternEdit.text(),
self, "generic")
exprDlg.setWindowTitle("Expression based filename")
if (exprDlg.exec_() == QtGui.QDialog.Accepted):
expression = exprDlg.expressionText()
if (not expression.isEmpty()):
# //set atlas filename expression
self.mAtlasFilenamePatternEdit.setText(expression)
if (not atlasMap.setFilenamePattern(expression)):
# //expression could not be set
QMessageBox.warning(
self, "Could not evaluate filename pattern",
QString(
"Could not set filename pattern as '%1'.\nParser error:\n%2"
).arg(expression,
atlasMap.filenamePatternErrorString()))
def add_expression_newvalue(self):
dlg = QgsExpressionBuilderDialog(self.layer, "Set expression for new value", self)
text = self.newValueText.text()
dlg.setExpressionText(text)
if dlg.exec_():
self.newValueText.setText(dlg.expressionText())
def add_expression_newvalue(self):
dlg = QgsExpressionBuilderDialog(self.layer, "Set expression for new value", self)
text = self.newValueText.text()
dlg.setExpressionText(text)
if dlg.exec_():
self.newValueText.setText(dlg.expressionText())
def show_builder(self):
dlg = QgsExpressionBuilderDialog(None)
if dlg.exec_():
self.namingText.setText(dlg.expressionText())
def show_builder(self):
dlg = QgsExpressionBuilderDialog(None)
if dlg.exec_():
self.namingText.setText(dlg.expressionText())
def add_expression_condition(self):
dlg = QgsExpressionBuilderDialog(self.layer, "Set condition expression", self)
text = self.condtionText.text()
dlg.setExpressionText(text)
if dlg.exec_():
self.condtionText.setText(dlg.expressionText())
def buildHighlight(self):
dialog = QgsExpressionBuilderDialog(self.collection().layer('lines'))
dialog.setExpressionText(self.collection().highlight)
if (dialog.exec_()):
self.applyHighlight(dialog.expressionText())
def populateByExpression(self, adding=False):
"""
Populates the panel using an expression
"""
context = dataobjects.createContext()
expression_context = context.expressionContext()
# use the first row parameter values as a preview during expression creation
params, ok = self.panel.parametersForRow(0, warnOnInvalid=False)
alg_scope = QgsExpressionContextUtils.processingAlgorithmScope(
self.panel.alg, params, context)
# create explicit variables corresponding to every parameter
for k, v in params.items():
alg_scope.setVariable(k, v, True)
# add batchCount in the alg scope to be used in the expressions. 0 is only an example value
alg_scope.setVariable('row_number', 0, False)
expression_context.appendScope(alg_scope)
# mark the parameter variables as highlighted for discoverability
highlighted_vars = expression_context.highlightedVariables()
highlighted_vars.extend(list(params.keys()))
highlighted_vars.append('row_number')
expression_context.setHighlightedVariables(highlighted_vars)
dlg = QgsExpressionBuilderDialog(layer=None,
context=context.expressionContext())
if adding:
dlg.setExpectedOutputFormat(
self.tr(
'An array of values corresponding to each new row to add'))
if not dlg.exec_():
return
if adding:
exp = QgsExpression(dlg.expressionText())
res = exp.evaluate(expression_context)
if type(res) is not list:
res = [res]
first_row = self.panel.batchRowCount(
) if self.panel.batchRowCount() > 1 else 0
self.panel.addRow(len(res))
self.panel.tblParameters.setUpdatesEnabled(False)
for row, value in enumerate(res):
self.setRowValue(row + first_row, value, context)
self.panel.tblParameters.setUpdatesEnabled(True)
else:
self.panel.tblParameters.setUpdatesEnabled(False)
for row in range(self.panel.batchRowCount()):
params, ok = self.panel.parametersForRow(row,
warnOnInvalid=False)
# remove previous algorithm scope -- we need to rebuild this completely, using the
# other parameter values from the current row
expression_context.popScope()
alg_scope = QgsExpressionContextUtils.processingAlgorithmScope(
self.panel.alg, params, context)
for k, v in params.items():
alg_scope.setVariable(k, v, True)
# add batch row number as evaluable variable in algorithm scope
alg_scope.setVariable('row_number', row, False)
expression_context.appendScope(alg_scope)
# rebuild a new expression every time -- we don't want the expression compiler to replace
# variables with precompiled values
exp = QgsExpression(dlg.expressionText())
value = exp.evaluate(expression_context)
self.setRowValue(row, value, context)
self.panel.tblParameters.setUpdatesEnabled(True)
def add_expression_condition(self):
dlg = QgsExpressionBuilderDialog(self.layer, "Set condition expression", self)
text = self.condtionText.text()
dlg.setExpressionText(text)
if dlg.exec_():
self.condtionText.setText(dlg.expressionText())
def showExpressionsBuilder(self):
dlg = QgsExpressionBuilderDialog(None, self.leText.text(), self, 'generic',
self.output.expressionContext(self.alg))
dlg.setWindowTitle(self.tr('Expression based output'))
if dlg.exec_() == QDialog.Accepted:
self.leText.setText(dlg.expressionText())
def buildSelection(self):
dialog = QgsExpressionBuilderDialog(self.collection().layer('lines'))
dialog.setExpressionText(self.collection().selection)
if (dialog.exec_()):
self.applySelection(dialog.expressionText())
