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[processing] show warning when file-based layer could not be loaded and dependent params updated

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For algorithms with multiple parameters depending on a vector layer parameter, the code that loads the layer in the background is called repeatedly, impacting performance. A small layer cache is implemented with these changes, so the dialog only tries to load the layer once.
This commit is contained in:
Víctor Olaya 2019-01-29 01:12:23 +01:00 committed by Nyall Dawson
parent 8446d3bdf0
commit 6eaa511eed
1 changed files with 18 additions and 2 deletions
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20
python/plugins/processing/gui/wrappers.py
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@ -45,6 +45,7 @@ from qgis.core import (
QgsSettings,
QgsProject,
QgsMapLayer,
QgsVectorLayer,
QgsProcessing,
QgsProcessingUtils,
QgsProcessingParameterDefinition,
@ -79,7 +80,8 @@ from qgis.core import (
QgsProcessingModelChildParameterSource,
QgsProcessingModelAlgorithm,
QgsRasterDataProvider,
NULL)
NULL,
Qgis)
from qgis.PyQt.QtWidgets import (
QCheckBox,
@ -1088,6 +1090,7 @@ class FeatureSourceWidgetWrapper(WidgetWrapper):
NOT_SELECTED = '[Not selected]'
def createWidget(self):
self.fileBasedLayers = {}
if self.dialogType == DIALOG_STANDARD:
widget = QWidget()
layout = QHBoxLayout()
@ -1430,6 +1433,7 @@ class VectorLayerWidgetWrapper(WidgetWrapper):
NOT_SELECTED = '[Not selected]'
def createWidget(self):
self.fileBasedLayers = {}
if self.dialogType == DIALOG_STANDARD:
widget = QWidget()
layout = QHBoxLayout()
@ -1615,14 +1619,26 @@ class TableFieldWidgetWrapper(WidgetWrapper):
break
def parentValueChanged(self, wrapper):
self.setLayer(wrapper.parameterValue())
value = wrapper.parameterValue()
if value in wrapper.fileBasedLayers:
self.setLayer(wrapper.fileBasedLayers[value])
else:
self.setLayer(value)
wrapper.fileBasedLayers[value] = self._layer
def setLayer(self, layer):
if isinstance(layer, QgsProcessingFeatureSourceDefinition):
layer, ok = layer.source.valueAsString(self.context.expressionContext())
if isinstance(layer, str):
layer = QgsProcessingUtils.mapLayerFromString(layer, self.context)
if not isinstance(layer, QgsVectorLayer) or not layer.isValid():
self.dialog.messageBar().clearWidgets()
self.dialog.messageBar().pushMessage("", self.tr("Could not load selected layer/table. Dependent field could not be populated"),
level=Qgis.Warning, duration=5)
return
self._layer = layer
self.refreshItems()
def refreshItems(self):