Class: QgsExpressionSelectionDialog

class qgis.gui.QgsExpressionSelectionDialog(layer: QgsVectorLayer, startText: str = '', parent: QWidget = None)

Bases: PyQt5.QtWidgets.QDialog

Creates a new selection dialog.

Parameters:
  • layer – The layer on which the selection is to be performed.
  • startText – A default expression text to be applied (Defaults to empty)
  • parent – parent object (owner)

This class offers a dialog to change feature selections. To do so, a QgsExpressionBuilderWidget is shown in a dialog. It offers the possibilities to create a new selection, add to the current selection remove from the current selection or select within the current selection.

Methods

actionEvent
changeEvent
childEvent
closeEvent Implementation for closeEvent Saves the window geometry
connectNotify
contextMenuEvent
create
customEvent
destroy
disconnectNotify
done Implementation for done (default behavior when pressing esc) Calls close, so the window geometry gets saved and the object deleted.
dragEnterEvent
dragLeaveEvent
dragMoveEvent
dropEvent
enterEvent
event
eventFilter
expressionBuilder The builder widget that is used by the dialog
expressionText Returns the current expression text
focusInEvent
focusNextChild
focusNextPrevChild
focusOutEvent
focusPreviousChild
hideEvent
initPainter
inputMethodEvent
isSignalConnected
keyPressEvent
keyReleaseEvent
leaveEvent
metric
mouseDoubleClickEvent
mouseMoveEvent
mousePressEvent
mouseReleaseEvent
moveEvent
nativeEvent
paintEvent
receivers
resizeEvent
sender
senderSignalIndex
setExpressionText Sets the current expression text
setGeomCalculator Sets geometry calculator used in distance/area calculations.
setMapCanvas Sets a map canvas associated with the dialog.
setMessageBar Sets the message bar to display feedback from the dialog.
sharedPainter
showEvent
tabletEvent
timerEvent
updateMicroFocus
wheelEvent

Signals

Attributes

actionEvent()
changeEvent()
childEvent()
closeEvent(self, closeEvent: QCloseEvent)

Implementation for closeEvent Saves the window geometry

Parameters:closeEvent – Event object. Unused.
connectNotify()
contextMenuEvent()
create()
customEvent()
destroy()
disconnectNotify()
done(self, r: int)

Implementation for done (default behavior when pressing esc) Calls close, so the window geometry gets saved and the object deleted.

Parameters:r – Result value. Unused.
dragEnterEvent()
dragLeaveEvent()
dragMoveEvent()
dropEvent()
enterEvent()
event()
eventFilter()
expressionBuilder(self) → QgsExpressionBuilderWidget

The builder widget that is used by the dialog

Returns:The builder widget that is used by the dialog
expressionText(self) → str

Returns the current expression text

Returns:The expression text
focusInEvent()
focusNextChild()
focusNextPrevChild()
focusOutEvent()
focusPreviousChild()
hideEvent()
initPainter()
inputMethodEvent()
isSignalConnected()
keyPressEvent()
keyReleaseEvent()
leaveEvent()
metric()
mouseDoubleClickEvent()
mouseMoveEvent()
mousePressEvent()
mouseReleaseEvent()
moveEvent()
nativeEvent()
paintEvent()
receivers()
resizeEvent()
sender()
senderSignalIndex()
setExpressionText(self, text: str)

Sets the current expression text

Parameters:text – the expression text to set
setGeomCalculator(self, da: QgsDistanceArea)

Sets geometry calculator used in distance/area calculations.

setMapCanvas(self, canvas: QgsMapCanvas)

Sets a map canvas associated with the dialog.

New in version 3.0.

setMessageBar(self, messageBar: QgsMessageBar)

Sets the message bar to display feedback from the dialog. This is used when zooming to features to display the count of selected features.

Parameters:messageBar – target message bar

New in version 3.0.

sharedPainter()
showEvent()
tabletEvent()
timerEvent()
updateMicroFocus()
wheelEvent()