class ExpressionLineEdit(QLineEdit):
def __init__(self, column, host=None, parent=None):
# Use a different pixmap
self._current_profile = current_profile()
QLineEdit.__init__(self, parent)
self.column = column
self._entity = self.column.entity
self.layer = self.create_layer()
self.host = host
# Configure load button
self.btn_load = QToolButton(parent)
self.btn_load.setCursor(Qt.PointingHandCursor)
self.btn_load.setFocusPolicy(Qt.NoFocus)
px = GuiUtils.get_icon_pixmap('expression.png')
self.btn_load.setIcon(QIcon(px))
self.btn_load.setIconSize(px.size())
self.btn_load.setStyleSheet('background: transparent; padding: 0px; '
'border: none;')
frame_width = self.set_button_minimum_size(self.btn_load)
# Ensure that text does not overlay button
padding = self.btn_load.sizeHint().width() + frame_width + 1
self.setStyleSheet('padding-right: ' + str(padding * 2) + 'px;')
# Set layout
self.button_layout = QHBoxLayout(self)
self.button_layout.addWidget(self.btn_load, 0, Qt.AlignRight)
self.button_layout.setSpacing(0)
self.button_layout.setMargin(5)
# Readonly as text generated automatically
self.setReadOnly(True)
# Current model object
self._current_item = None
def create_layer(self):
srid = None
column = ''
if self.entity.has_geometry_column():
geom_cols = [col.name for col in self.entity.columns.values()
if col.TYPE_INFO == 'GEOMETRY']
column = geom_cols[0]
geom_col_obj = self.entity.columns[column]
if geom_col_obj.srid >= 100000:
srid = geom_col_obj.srid
layer = vector_layer(self.entity.name, geom_column=column,
proj_wkt=srid)
return layer
def get_feature_value(self, model=None):
self.layer.startEditing()
feature = None
request = QgsFeatureRequest()
if model is None:
model = self.host.model()
request.setFilterFid(model.id)
feature_itr = self.layer.getFeatures(request)
for feat in feature_itr:
feature = feat
break
exp = QgsExpression(self.column.expression)
if exp.hasParserError():
raise Exception(exp.parserErrorString())
exp.prepare(self.layer.fields())
if feature is not None:
value = exp.evaluate(feature)
return value
else:
return None
def set_button_minimum_size(self, button):
"""
Sets the minimum button size.
:param button: The button to be set.
:type button: QToolButton
:return: Returns the frame width of the button
:rtype: Integer
"""
frame_width = self.style().pixelMetric(QStyle.PM_DefaultFrameWidth)
msz = self.minimumSizeHint()
self.setMinimumSize(
max(
msz.width(),
button.sizeHint().height() + frame_width * 2 + 2
), max(
msz.height(),
button.sizeHint().height() + frame_width * 2 + 2
)
)
return frame_width
@property
def entity(self):
"""
:return: Returns the entity object corresponding to this widget.
:rtype: Entity
"""
return self._entity
def clear_line_edit(self):
"""
Clears the text in the line edit.
"""
self.clear()
def on_expression_triggered(self, model=None):
"""
Slot raised to load browser for selecting foreign key entities. To be
implemented by subclasses.
"""
self.format_display(self.get_feature_value(model))
return self.get_feature_value()
def format_display(self, value):
"""
Extract object values to show in the line edit based on the specified
display columns.
"""
if value is not None:
self.setText(str(value))
class ForeignKeyLineEdit(QLineEdit):
"""
Line edit that enables the browsing of related entities defined through
foreign key constraint.
"""
def __init__(self, column, parent=None, pixmap=None, host=None):
"""
Class constructor.
:param column: Column object containing foreign key information.
:type column: BaseColumn
:param parent: Parent widget for the control.
:type parent: QWidget
:param pixmap: Pixmap to use for the line edit button.
:type pixmap: QPixmap
"""
QLineEdit.__init__(self, parent)
self.column = column
self._entity = self.column.entity
self.entity_dialog = host
# Configure load button
self.btn_load = QToolButton(parent)
self.btn_load.setCursor(Qt.PointingHandCursor)
self.btn_load.setFocusPolicy(Qt.NoFocus)
px = GuiUtils.get_icon_pixmap('select_record.png')
if not pixmap is None:
px = pixmap
self.btn_load.setIcon(QIcon(px))
self.btn_load.setIconSize(px.size())
self.btn_load.setStyleSheet('background: transparent; padding: 0px; '
'border: none;')
self.btn_load.clicked.connect(self.on_load_foreign_key_browser)
clear_px = GuiUtils.get_icon_pixmap('clear.png')
self.btn_clear = QToolButton(parent)
self.btn_clear.setCursor(Qt.PointingHandCursor)
self.btn_clear.setFocusPolicy(Qt.NoFocus)
self.btn_clear.setIcon(QIcon(clear_px))
self.btn_clear.setIconSize(clear_px.size())
self.btn_clear.setStyleSheet('background: transparent; padding: 0px; '
'border: none;')
self.btn_clear.clicked.connect(self.clear_line_edit)
frame_width = self.set_button_minimum_size(self.btn_load)
self.set_button_minimum_size(self.btn_clear)
# Ensure that text does not overlay button
padding = self.btn_load.sizeHint().width() + frame_width + 1
self.setStyleSheet('padding-right: ' + str(padding * 2) + 'px;')
# Set layout
self.button_layout = QHBoxLayout(self)
self.button_layout.addWidget(self.btn_clear, 0, Qt.AlignRight)
self.button_layout.addWidget(self.btn_load, 0, Qt.AlignRight)
self.button_layout.setSpacing(0)
self.button_layout.setMargin(5)
self.btn_clear.setVisible(False)
# Readonly as text is loaded from the related entity
self.setReadOnly(True)
# Current model object
self._current_item = None
def set_button_minimum_size(self, button):
"""
Sets the minimum button size.
:param button: The button to be set.
:type button: QToolButton
:return: Returns the frame width of the button
:rtype: Integer
"""
frame_width = self.style().pixelMetric(QStyle.PM_DefaultFrameWidth)
msz = self.minimumSizeHint()
self.setMinimumSize(
max(
msz.width(),
button.sizeHint().height() + frame_width * 2 + 2
), max(
msz.height(),
button.sizeHint().height() + frame_width * 2 + 2
)
)
return frame_width
@property
def current_item(self):
return self._current_item
@current_item.setter
def current_item(self, value):
# Update display every time the current item is changed.
self._current_item = value
self.format_display()
@property
def entity(self):
"""
:return: Returns the entity object corresponding to this widget.
:rtype: Entity
"""
return self._entity
def clear_line_edit(self):
"""
Clears the text in the line edit.
"""
self.clear()
self.hide_clear_button()
def hide_clear_button(self):
"""
Hides the clear button.
"""
self.btn_clear.setVisible(False)
self.button_layout.setStretch(0, 0)
def show_clear_button(self):
"""
Shows the clear button if a text exists.
"""
if len(self.text()) > 0:
self.btn_clear.setVisible(True)
self.button_layout.setStretch(0, 5)
def on_load_foreign_key_browser(self):
"""
Slot raised to load browser for selecting foreign key entities. To be
implemented by subclasses.
"""
raise NotImplementedError
def format_display(self):
"""
Extract object values to show in the line edit based on the specified
display columns.
"""
raise NotImplementedError
def parent_entity_model(self):
"""
:return: Returns the database model corresponding to the parent table
of the relation defined by this column. Please note that the database
model will not contain relationship configurations in its attributes.
:rtype: object
"""
entity = self.column.entity_relation.parent
return entity_model(entity, entity_only=True)
def load_current_item_from_id(self, id):
"""
Loads the current item from the id corresponding to the primary
key.
:param id: Primary key of the referenced entity.
:type id: int
"""
QApplication.processEvents()
model = self.parent_entity_model()
if model is None:
return
model_obj = model()
res = model_obj.queryObject().filter(model.id == id).first()
if not res is None:
self.current_item = res
