An expression script using the Simple REST language. More...
Public Functions Detailed DescriptionThe label Simple expression expects to hold a legal, Simple script and to be read and evaluated by a Simple expression interpreter. An example expression that combines text with a field value is
"State: " CONCAT [State_Name]
Note that quotes are needed around the literal text. See https://developers.arcgis.com/documentation/common-data-types/labeling-objects.htm for full documentation on the <b>labelExpression</b> syntax and functions.
Note: If the expression attempts to use attributes which don't exist then no label will be produced. This is distinct from the attribute existing but having a null or empty value, which can form part of the produced text label.
Relevant samples:
[explicit] SimpleLabelExpression::SimpleLabelExpression(QObject *parent = nullptr)
Creates a label Simple expression with an empty expression script.
An empty script is a legal Simple expression that will evaluate to an empty string.
[explicit] SimpleLabelExpression::SimpleLabelExpression(const QString &simpleExpression, QObject *parent = nullptr)
Creates a label Simple expression with a specific Simple script.
The expression is expected to be a complete, self-contained Simple expression.
[override virtual noexcept] SimpleLabelExpression::~SimpleLabelExpression()
Destructor.
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