def _layerTreeChanged(self):
"""
Re-populate layers for dropdowns dynamically when layers were
added/removed.
"""
# First get all point layers in map canvas
layer_names = []
root = self.project.layerTreeRoot()
for child in root.children():
if isinstance(child, QgsLayerTreeLayer):
layer = child.layer()
# Handle weird project startup behaviour of QGIS (apparently
# doesn't find layers on project startup and throws AttributeError)
try:
if layer.type(
) == QgsMapLayer.VectorLayer and layer.wkbType(
) == QgsWkbTypes.Type(1):
layer_names.append(layer.name())
except AttributeError:
continue
comboboxes = [
self.start_layer_combo, self.end_layer_combo,
self.access_layer_combo, self.matrix_start_combo,
self.matrix_end_combo
]
for box in comboboxes:
old_text = box.currentText()
box.clear()
for layer in layer_names:
box.addItem(layer)
new_text_id = box.findText(old_text)
box.setCurrentIndex(new_text_id)
