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processlayer.py
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processlayer.py
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from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
LAYER, ID, ATTRIBUTE, AREA, EDGE, CENTROID = range(6)
class ProcessLayer(object):
def __init__(self, qgis_layer, processor, unique_fields):
self.qgis_layer_name = qgis_layer.name()
self.qgis_layer = qgis_layer
provider = qgis_layer.dataProvider()
self.id_field_name = unique_fields[0]
self.attribute_field_name = '<None>'
self.process_area = False
geometry_type = qgis_layer.geometryType()
self.process_centroid_distance = False
self.process_edge_distance = True
if geometry_type == QGis.Point:
self.process_centroid_distance = True
self.process_edge_distance = False
class ProcessLayerTableModel(QAbstractTableModel):
is_runnable_check = pyqtSignal()
def __init__(self, qgis_layers, current_layers, processor, dialog):
self.processor = processor
self.dialog = dialog
self._header_labels = range(6)
self._header_labels[LAYER] = 'Layer'
self._header_labels[ID] = 'Node ID\n(unique)'
self._header_labels[CENTROID] = 'Centroid\ndistance'
self._header_labels[EDGE] = 'Edge\ndistance'
self._header_labels[AREA] = 'Calculate area\nas the node\nattribute'
self._header_labels[ATTRIBUTE] = 'Node\nattribute'
super(ProcessLayerTableModel, self).__init__()
self.dirty = False
self.data_ = qgis_layers
self.layers = []
for la in current_layers:
fields = qgis_layers[la]
self.layers.append(ProcessLayer(la, self.processor, fields))
def rowCount(self, index=QModelIndex()):
return len(self.layers)
def columnCount(self, index=QModelIndex):
return 6
def data(self, index, role=Qt.DisplayRole):
if not index.isValid() or not (0 <= index.row() < len(self.layers)):
result = None
else:
layer = self.layers[index.row()]
locked_layer = layer
column = index.column()
row = index.row()
if row != 0 and self.dialog.lock_layers_chb.isChecked():
layer = self.layers[0]
if role == Qt.DisplayRole:
if column == LAYER:
result = locked_layer.qgis_layer_name
elif column == ID:
result = layer.id_field_name
elif column == ATTRIBUTE:
result = layer.attribute_field_name
elif column == AREA:
if layer.qgis_layer.geometryType() == QGis.Point:
result = '<Unavailable>'
else:
result = None
elif column == EDGE:
if layer.qgis_layer.geometryType() == QGis.Point:
result = '<Unavailable>'
else:
result = None
else:
result = None
elif role == Qt.CheckStateRole:
if column == AREA:
if layer.qgis_layer.geometryType() == QGis.Point:
result = None
else:
if layer.process_area:
result = Qt.Checked
else:
result = Qt.Unchecked
elif column == CENTROID:
if layer.process_centroid_distance:
result = Qt.Checked
else:
result = Qt.Unchecked
elif column == EDGE:
if layer.qgis_layer.geometryType() == QGis.Point:
result = None
else:
if layer.process_edge_distance:
result = Qt.Checked
else:
result = Qt.Unchecked
else:
result = None
elif role == Qt.TextAlignmentRole:
if column in (AREA, CENTROID, EDGE):
result = int(Qt.AlignHCenter|Qt.AlignVCenter)
else:
result = None
else:
result = None
return result
def headerData(self, section, orientation, role=Qt.DisplayRole):
if role == Qt.DisplayRole and orientation == Qt.Horizontal:
result = self._header_labels[section]
else:
result = QAbstractTableModel.headerData(self, section, orientation,
role)
return result
def flags(self, index):
if self.dialog.lock_layers_chb.isChecked():
if index.row() == 0:
if index.column() in (AREA, CENTROID, EDGE):
result = Qt.ItemFlags(Qt.ItemIsEnabled|Qt.ItemIsUserCheckable)
else:
result = Qt.ItemFlags(QAbstractTableModel.flags(self, index)|
Qt.ItemIsEditable)
else:
result = Qt.NoItemFlags
else:
if not index.isValid():
result = Qt.ItemIsEnabled()
else:
if index.column() in (AREA, CENTROID, EDGE):
result = Qt.ItemFlags(Qt.ItemIsEnabled|Qt.ItemIsUserCheckable)
else:
result = Qt.ItemFlags(QAbstractTableModel.flags(self, index)|
Qt.ItemIsEditable)
return result
def setData(self, index, value, role=Qt.EditRole):
result = False
if index.isValid() and 0 <= index.row() < len(self.layers):
layer = self.layers[index.row()]
column = index.column()
if column == LAYER:
layer.qgis_layer_name = value
layer.qgis_layer = self._get_qgis_layer(value)
elif column == ID:
layer.id_field_name = value
elif column == ATTRIBUTE:
layer.attribute_field_name = value
elif column == AREA:
try:
if layer.qgis_layer.geometryType() != QGis.Point:
layer.process_area = value
else:
layer.process_area = False
except AttributeError:
layer.process_area = value
elif column == CENTROID:
layer.process_centroid_distance = value
elif column == EDGE:
try:
if layer.qgis_layer.geometryType() != QGis.Point:
layer.process_edge_distance = bool(value)
else:
layer.process_edge_distance = False
except AttributeError:
layer.process_edge_distance = value
self.dirty = True
#self.emit(SIGNAL('dataChanged(QModelIndex,QModelIndex)'),
# index, index)
self.dataChanged.emit(index, index)
result = True
self.is_runnable_check.emit()
return result
def _get_qgis_layer(self, layer_name):
qgis_layer = None
for la, unique_fields in self.data_.iteritems():
if str(la.name()) == str(layer_name):
qgis_layer = la
return qgis_layer
def insertRows(self, position, rows=1, index=QModelIndex()):
self.beginInsertRows(QModelIndex(), position, position + rows - 1)
a_layer = self.data_.keys()[0]
unique_fields = self.data_[a_layer]
for row in range(rows):
self.layers.insert(position + row, ProcessLayer(a_layer,
self.processor, unique_fields))
self.endInsertRows()
self.dirty = True
return True
def removeRows(self, position, rows=1, index=QModelIndex()):
result = False
if self.rowCount() > 1:
self.beginRemoveRows(QModelIndex(), position, position + rows - 1)
self.layers = self.layers[:position] + self.layers[position + rows:]
self.endRemoveRows()
self.dirty = True
result = True
return result
def get_field_names(self, layer_name):
the_layer = None
for layer in self.data_.keys():
if str(layer.name()) == str(layer_name):
the_layer = layer
provider = the_layer.dataProvider()
the_fields = [f for f in provider.fields() \
if f.type() in (QVariant.Int, QVariant.Double)]
return [f.name() for f in the_fields]
class ProcessLayerDelegate(QItemDelegate):
def __init__(self, dialog, parent=None):
super(ProcessLayerDelegate, self).__init__(parent)
self.dialog = dialog
def createEditor(self, parent, option, index):
column = index.column()
row = index.row()
if column in (LAYER, ID, ATTRIBUTE):
combo_box = QComboBox(parent)
self.connect(combo_box, SIGNAL('activated(int)'),
self.commitAndCloseEditor)
result = combo_box
else:
result = QItemDelegate.createEditor(self, parent, option,
index)
return result
def setEditorData(self, editor, index):
row = index.row()
column = index.column()
model = index.model()
selected_layer_name = model.layers[row].qgis_layer_name
selected_id_field_name = model.layers[row].id_field_name
selected_attribute_field_name = model.layers[row].attribute_field_name
layer = model._get_qgis_layer(selected_layer_name)
if column == LAYER:
layer_names = [la.name() for la in model.data_.keys()]
editor.addItems(layer_names)
cmb_index = editor.findText(selected_layer_name)
editor.setCurrentIndex(cmb_index)
elif column == ID:
unique_field_names = model.data_.get(layer)
editor.addItems(unique_field_names)
cmb_index = editor.findText(selected_id_field_name)
editor.setCurrentIndex(cmb_index)
elif column == ATTRIBUTE:
field_names = model.get_field_names(selected_layer_name)
editor.addItems(['<None>'] + field_names)
cmb_index = editor.findText(selected_attribute_field_name)
editor.setCurrentIndex(cmb_index)
else:
QItemDelegate.setEditorData(self, editor, index)
def setModelData(self, editor, model, index):
row = index.row()
column = index.column()
if column == LAYER:
model.setData(index, editor.currentText())
selected_layer_name = str(editor.currentText())
layer = model._get_qgis_layer(selected_layer_name)
unique_field_names = model.data_.get(layer)
id_index = model.index(index.row(), ID)
attr_index = model.index(index.row(), ATTRIBUTE)
model.setData(id_index, unique_field_names[0])
model.setData(attr_index, '<None>')
elif column in (ID, ATTRIBUTE):
model.setData(index, editor.currentText())
else:
QItemDelegate.setModelData(self, editor, model, index)
def commitAndCloseEditor(self):
editor = self.sender()
if isinstance(editor, QComboBox):
self.commitData.emit(editor)
self.closeEditor.emit(editor, QAbstractItemDelegate.EditNextItem)