def max_value(values, context, parent, node):
"""
<h3>function max_value</h3>
<div class="description">Returns the maximum value from a layer for a given column.</div>
<h4>Syntax</h4>
<div class="syntax">
<code><span class="functionname">max_value</span>(<span class="argument">string</span>, <span class="argument">string</span>)</code>
<h4>Arguments</h4>
<div class="arguments">
<table>
<tr><td class="argument">string</td><td>A string (case sensitive) representing a layer in the current workspace.</td></tr>
<tr><td class="argument">string</td><td>A string (case sensitive) representing a field within this layer.</td></tr>
</table>
</div>
<h4>Examples</h4>
<div class="examples">
<ul>
<li><code>max_value('Trees', 'pk')</code> → <code>Maximum primary key ('pk') value in layer 'Trees'.</code></li>
</ul>
</div>
"""
layer = values[0]
try:
layer = utils.layer_by_name(layer)
except IndexError:
parent.setEvalErrorString("Can't find layer {}".format(layer))
return
field = values[1]
index = layer.fields().indexOf(field)
if index == -1:
return None
return layer.maximumValue(index)
def set_project(self, project, node):
"""
Set the project for the widget. Updates the selection query for the current widget..
"""
self.connectionCombo.blockSignals(False)
super(InfoNode, self).set_project(project, node)
# uri = QgsDataSourceURI(self.layer.dataProvider().dataSourceUri())
infoblock = self.project.info_query(node.key, node.layer.name())
caption = infoblock.get("caption", node.text())
query = infoblock.get("query", "")
connection = infoblock.get("connection", "from_layer")
if connection == "from_layer":
self.thislayer_radio.setChecked(True)
else:
layername = connection['layer']
layer = utils.layer_by_name(layername)
self.fromlayer_radio.setChecked(True)
self.connectionCombo.setLayer(layer)
self.caption_edit.setText(caption)
self.Editor.setText(query)
self.attributesLabel.setText("")
self.previewGrid.setModel(None)
self.resultsLabel.setText("")
if not self.update_panel_status():
pass
def set_project(self, project, node):
"""
Set the project for the widget. Updates the selection query for the current widget..
"""
self.connectionCombo.blockSignals(False)
super(InfoNode, self).set_project(project, node)
self.layer = self.treenode.layer
# uri = QgsDataSourceURI(self.layer.dataProvider().dataSourceUri())
if not self.update_panel_status():
pass
infoblock = self.project.info_query(node.key, node.layer.name())
caption = infoblock.get("caption", node.text())
query = infoblock.get("query", "")
connection = infoblock.get("connection", "from_layer")
if connection == "from_layer":
self.thislayer_radio.setChecked(True)
else:
layername = connection['layer']
layer = utils.layer_by_name(layername)
self.fromlayer_radio.setChecked(True)
self.connectionCombo.setLayer(layer)
self.caption_edit.setText(caption)
self.Editor.setText(query)
def get_layer() -> str:
connection = infoblockdef.get('connection', "from_layer")
if isinstance(connection, dict):
return layer_by_name(connection['layer'])
elif connection == "from_layer":
return layer
else:
raise NotImplementedError("{} is not a supported connection type".format(connection))
def get_layer():
connection = infoblockdef['connection']
if isinstance(connection, dict):
return layer_by_name(connection['layer'])
elif connection == "from_layer":
return layer
else:
raise NotImplementedError("{} is not a supported connection type".format(connection))
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 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 get_work_layer(self):
settings = self.project.settings
layername = settings['gpspointlayer']
self.w_layer = utils.layer_by_name(layername[0])
field_nat = settings['gpspointattr']
self.w_layer_nat_field = field_nat[0]
try:
field_time = settings['gpspointtime']
self.w_layer_time_field = field_time[0]
except (KeyError):
logger.info('No time field in project.config')
self.w_layer_time_field = None
def max_value(values, feature, parent):
"""
Return the max value from a layer for the given column
Usage:
max_value('Trees', 'pk')
"""
layer = values[0]
try:
layer = utils.layer_by_name(layer)
except IndexError:
parent.setEvalErrorString("Can't find layer {}".format(layer))
return
field = values[1]
index = layer.fields().indexOf(field)
if index == -1:
return None
return layer.maximumValue(index)
def max_value(values, feature, parent):
"""
Return the max value from a layer for the given column
Usage:
max_value('Trees', 'pk')
"""
layer = values[0]
try:
layer = utils.layer_by_name(layer)
except IndexError:
parent.setEvalErrorString("Can't find layer {}".format(layer))
return
field = values[1]
index = layer.fieldNameIndex(field)
if index == -1:
return None
return layer.maximumValue(index)
def set_project(self, project, node):
self.connectionCombo.blockSignals(False)
super(InfoNode, self).set_project(project, node)
self.layer = self.treenode.layer
# uri = QgsDataSourceURI(self.layer.dataProvider().dataSourceUri())
if not self.update_panel_status():
pass
infoblock = self.project.info_query(node.key, node.layer.name())
caption = infoblock.get("caption", node.text())
query = infoblock.get("query", "")
connection = infoblock.get("connection", "from_layer")
if connection == "from_layer":
self.thislayer_radio.setChecked(True)
else:
layername = connection['layer']
layer = utils.layer_by_name(layername)
self.fromlayer_radio.setChecked(True)
self.connectionCombo.setLayer(layer)
self.caption_edit.setText(caption)
self.Editor.setText(query)
