LegendItem

Zusammenfassung

LegendItem provides access to legend item level information in a LegendElement.

Diskussion

The items property on the LegendElement class returns a list of LegendItem objects. For each legend item, you can change properties such as arrangement, patchHeight, and its visible status. The typical workflow is to iterate through the list of elements, determine the item of interest by its name property, then make the appropriate changes.

Hinweis:

The properties exposed to the LegendItem class do not apply to all renderer types. It is important to catch these exceptions when necessary.

Eigenschaften

Eigenschaft	Erläuterung	Datentyp
arrangement (Lesen und schreiben)	A string that determines the legend item arrangement. The following is a valid list of values: PatchLabelDescription—Patch, label, description PatchDescriptionLabel—Patch, description, label LabelPatchDescription—Label, patch, description LabelDescriptionPatch—Label, description, patch DescriptionPatchLabel—Description, patch, label DescriptionLabelPatch—Description, label, patch	String
column (Lesen und schreiben)	The column position for a legend item. The column property only applies to legends using the ManualColumns fitting strategy.	Long
name (Schreibgeschützt)	Returns the legend item name. The legend item name is set by modifying the layer name.	String
patchHeight (Lesen und schreiben)	The height of a legend item patch. Units are in points.	Double
patchWidth (Lesen und schreiben)	The width of a legend item patch. Units are in points.	Double
showFeatureCount (Lesen und schreiben)	A Boolean that controls whether the feature count is placed next to the legend item text. The value displayed is dependent on the showVisibleFeatures setting.	Boolean
showVisibleFeatures (Lesen und schreiben)	A Boolean that controls whether the legend item displays all values or only those values that appear in the visible extent.	Boolean
type (Schreibgeschützt)	Returns a value of LEGEND_ITEM.	String
visible (Lesen und schreiben)	Returns True if the legend item is visible in the legend.	Boolean

Methodenübersicht

Methode	Erläuterung
applyStyleItem (style_item)	Applies a StyleItem to a LegendItem.

Methoden

applyStyleItem (style_item)

Parameter	Erläuterung	Datentyp
style_item	A reference to a StyleItem in a project.	StyleItem

When referencing a StyleItem using the listStyleItems method on the ArcGISProject class, the style_class parameter must be LEGEND_ITEM. For more information and code samples, refer the to StyleItem help topic.

Hinweis:

Styles must be added to a project prior to using the applyStyleItem method. Styles can be added using the updateStyles method on theArcGISProject class.

Codebeispiel

LegendItem example

The following script iterates through all legend items in a legend. Its sets the patchHeight and patchWidth for all legend items, then sets showVisibleFeatures for a specific legend item.

p = arcpy.mp.ArcGISProject('current')
lyt = p.listLayouts('Layout')[0]
leg = lyt.listElements('LEGEND_ELEMENT')[0]

#Change the patch size for all legend items
#only display features in the visible map frame extent
for itm in leg.items:
  itm.patchHeight = 15
  itm.patchWidth = 30
  if itm.name == 'Geological Types':
    itm.showVisibleFeatures = True