Class: QgsExpressionBuilderDialog

class qgis.gui.QgsExpressionBuilderDialog

Bases: PyQt5.QtWidgets.QDialog

A generic dialog for building expression strings @remarks This class also shows an example on how to use QgsExpressionBuilderWidget

Methods

accept

actionEvent

allowEvalErrors

Allow accepting invalid expressions.

changeEvent

childEvent

closeEvent

connectNotify

contextMenuEvent

create

customEvent

destroy

disconnectNotify

done

Is called when the dialog get accepted or rejected Used to save geometry

dragEnterEvent

dragLeaveEvent

dragMoveEvent

dropEvent

enterEvent

event

eventFilter

expectedOutputFormat

Returns the expected format string, which is shown in the dialog.

expressionBuilder

The builder widget that is used by the dialog

expressionContext

Returns the expression context for the dialog.

expressionText

rtype

str

focusInEvent

focusNextChild

focusNextPrevChild

focusOutEvent

focusPreviousChild

hideEvent

initPainter

inputMethodEvent

isSignalConnected

keyPressEvent

keyReleaseEvent

leaveEvent

metric

mouseDoubleClickEvent

mouseMoveEvent

mousePressEvent

mouseReleaseEvent

moveEvent

nativeEvent

paintEvent

receivers

resizeEvent

sender

senderSignalIndex

setAllowEvalErrors

Allow accepting expressions with evaluation errors.

setExpectedOutputFormat

Set the expected format string, which is shown in the dialog.

setExpressionContext

Sets the expression context for the dialog.

setExpressionText

param text

setGeomCalculator

Sets geometry calculator used in distance/area calculations.

sharedPainter

showEvent

tabletEvent

timerEvent

updateMicroFocus

wheelEvent

Signals

allowEvalErrorsChanged

Allow accepting expressions with evaluation errors.

accept(self)
actionEvent()
allowEvalErrors(self) → bool

Allow accepting invalid expressions. This can be useful when we are not able to provide an expression context of which we are sure it’s completely populated.

New in version 3.0.

Return type

bool

allowEvalErrorsChanged

Allow accepting expressions with evaluation errors. This can be useful when we are not able to provide an expression context of which we are sure it’s completely populated.

New in version 3.0: [signal]

changeEvent()
childEvent()
closeEvent()
connectNotify()
contextMenuEvent()
create()
customEvent()
destroy()
disconnectNotify()
done(self, r: int)

Is called when the dialog get accepted or rejected Used to save geometry

Parameters

r (int) – result value (unused)

dragEnterEvent()
dragLeaveEvent()
dragMoveEvent()
dropEvent()
enterEvent()
event()
eventFilter()
expectedOutputFormat(self) → str

Returns the expected format string, which is shown in the dialog. This is purely a text format and no expression validation is done against it.

Return type

str

expressionBuilder(self)QgsExpressionBuilderWidget

The builder widget that is used by the dialog

Return type

QgsExpressionBuilderWidget

expressionContext(self)QgsExpressionContext

Returns the expression context for the dialog. The context is used for the expression preview result and for populating the list of available functions and variables.

New in version 2.12.

Return type

QgsExpressionContext

expressionText(self) → str
Return type

str

focusInEvent()
focusNextChild()
focusNextPrevChild()
focusOutEvent()
focusPreviousChild()
hideEvent()
initPainter()
inputMethodEvent()
isSignalConnected()
keyPressEvent()
keyReleaseEvent()
leaveEvent()
metric()
mouseDoubleClickEvent()
mouseMoveEvent()
mousePressEvent()
mouseReleaseEvent()
moveEvent()
nativeEvent()
paintEvent()
receivers()
resizeEvent()
sender()
senderSignalIndex()
setAllowEvalErrors(self, allowEvalErrors: bool)

Allow accepting expressions with evaluation errors. This can be useful when we are not able to provide an expression context of which we are sure it’s completely populated.

New in version 3.0.

Parameters

allowEvalErrors (bool) –

setExpectedOutputFormat(self, expected: str)

Set the expected format string, which is shown in the dialog. This is purely a text format and no expression validation is done against it.

Parameters

expected (str) –

setExpressionContext(self, context: QgsExpressionContext)

Sets the expression context for the dialog. The context is used for the expression preview result and for populating the list of available functions and variables.

Parameters

context (QgsExpressionContext) – expression context

New in version 2.12.

setExpressionText(self, text: str)
Parameters

text (str) –

setGeomCalculator(self, da: QgsDistanceArea)

Sets geometry calculator used in distance/area calculations.

Parameters

da (QgsDistanceArea) –

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