Class: QgsExpressionSelectionDialog¶

class qgis.gui.QgsExpressionSelectionDialog¶

Bases: PyQt5.QtWidgets.QDialog

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.

QgsExpressionSelectionDialog(layer: Optional[QgsVectorLayer], startText: Optional[str] = ‘’, parent: Optional[QWidget] = None) 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)

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`

actionEvent(self, a0: QActionEvent | None)¶

changeEvent(self, a0: QEvent | None)¶

childEvent(self, a0: QChildEvent | None)¶

closeEvent(self, closeEvent: QCloseEvent | None)¶

Implementation for closeEvent Saves the window geometry

Parameters:: closeEvent (Optional[QCloseEvent]) – Event object. Unused.

connectNotify(self, signal: QMetaMethod)¶

contextMenuEvent(self, a0: QContextMenuEvent | None)¶

create(self, window: PyQt5.sip.voidptr = None, initializeWindow: bool = True, destroyOldWindow: bool = True)¶

customEvent(self, a0: QEvent | None)¶

destroy(self, destroyWindow: bool = True, destroySubWindows: bool = True)¶

disconnectNotify(self, signal: QMetaMethod)¶

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 (int) – Result value. Unused.

dragEnterEvent(self, a0: QDragEnterEvent | None)¶

dragLeaveEvent(self, a0: QDragLeaveEvent | None)¶

dragMoveEvent(self, a0: QDragMoveEvent | None)¶

dropEvent(self, a0: QDropEvent | None)¶

enterEvent(self, a0: QEvent | None)¶

event(self, a0: QEvent | None) → bool¶

eventFilter(self, a0: QObject | None, a1: QEvent | None) → bool¶

expressionBuilder(self) → QgsExpressionBuilderWidget | None¶

The builder widget that is used by the dialog

Return type:: Optional[QgsExpressionBuilderWidget]
Returns:: The builder widget that is used by the dialog

expressionText(self) → str¶

Returns the current expression text

Return type:: str
Returns:: The expression text

focusInEvent(self, a0: QFocusEvent | None)¶

focusNextChild(self) → bool¶

focusNextPrevChild(self, next: bool) → bool¶

focusOutEvent(self, a0: QFocusEvent | None)¶

focusPreviousChild(self) → bool¶

hideEvent(self, a0: QHideEvent | None)¶

initPainter(self, painter: QPainter | None)¶

inputMethodEvent(self, a0: QInputMethodEvent | None)¶

isSignalConnected(self, signal: QMetaMethod) → bool¶

keyPressEvent(self, a0: QKeyEvent | None)¶

keyReleaseEvent(self, a0: QKeyEvent | None)¶

leaveEvent(self, a0: QEvent | None)¶

metric(self, a0: QPaintDevice.PaintDeviceMetric) → int¶

mouseDoubleClickEvent(self, a0: QMouseEvent | None)¶

mouseMoveEvent(self, a0: QMouseEvent | None)¶

mousePressEvent(self, a0: QMouseEvent | None)¶

mouseReleaseEvent(self, a0: QMouseEvent | None)¶

moveEvent(self, a0: QMoveEvent | None)¶

nativeEvent(self, eventType: QByteArray | bytes | bytearray, message: PyQt5.sip.voidptr | None)¶

paintEvent(self, a0: QPaintEvent | None)¶

receivers(self, signal: PYQT_SIGNAL) → int¶

resizeEvent(self, a0: QResizeEvent | None)¶

sender(self) → QObject | None¶

senderSignalIndex(self) → int¶

setExpressionText(self, text: str | None)¶

Sets the current expression text

Parameters:: text (Optional[str]) – the expression text to set

setGeomCalculator(self, da: QgsDistanceArea)¶

Sets geometry calculator used in distance/area calculations.

Parameters:: da (QgsDistanceArea)

setMapCanvas(self, canvas: QgsMapCanvas | None)¶

Sets a map canvas associated with the dialog.

Added in version 3.0.

Parameters:: canvas (Optional[QgsMapCanvas])

setMessageBar(self, messageBar: QgsMessageBar | None)¶

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 (Optional[QgsMessageBar]) – target message bar

Added in version 3.0.

sharedPainter(self) → QPainter | None¶

showEvent(self, a0: QShowEvent | None)¶

tabletEvent(self, a0: QTabletEvent | None)¶

timerEvent(self, a0: QTimerEvent | None)¶

updateMicroFocus(self)¶

wheelEvent(self, a0: QWheelEvent | None)¶