Know if Smartfilter bar is open or close

Hi guys,

maybe the answer is easy but I can't found if the Smartfilter bar is open or not.
The xml code is that :

<f:DynamicPage title="{i18n>appTitle}" showNavButton="false" enableScrolling="false" id="ganttPage">
				<f:title>
					<f:DynamicPageTitle id="titlePanel">
						<f:heading>
							<sv:SmartVariantManagement id="__SVM01" persistencyKey="zvariant_variant" showShare="true" showExecuteOnSelection="true"/>
						</f:heading>
						<f:snappedContent>
							<m:Text id="statusText"></m:Text>
						</f:snappedContent>
					</f:DynamicPageTitle>
				</f:title>
				<f:header>
					<f:DynamicPageHeader id="headerPanel">
						<f:content>
							<smartFilterBar:SmartFilterBar id="smartFilterBar" persistencyKey="zvariant_filterbar" smartVariant="__SVM01" useToolbar="false"
								entitySet="ZPD_FILTERBAR_C" considerSelectionVariants="true" assignedFiltersChanged="onAssignedFiltersChanged">
								<smartFilterBar:controlConfiguration>
								</smartFilterBar:controlConfiguration>
								<smartFilterBar:groupConfiguration>
									<smartFilterBar:GroupConfiguration key="LineItems" label="{i18n>GROUP_LABEL}"></smartFilterBar:GroupConfiguration>
								</smartFilterBar:groupConfiguration>
								<smartFilterBar:layoutData>
									<m:FlexItemData shrinkFactor="0"/>
								</smartFilterBar:layoutData>
							</smartFilterBar:SmartFilterBar>
						</f:content>
					</f:DynamicPageHeader>
				</f:header>
etc....

I want to know if it is in this open status

or close :

I'm using this event for change the status of smartfilter bar but I need use it only when It's open :

this.getView().byId("headerPanel").fireEvent("_headerVisualIndicatorPress");

cloud you help me to found the correct property ?
Thanks you