DXCollectionView.GroupCollapsing Event

Occurs before a group of items is collapsed.

Namespace: DevExpress.Maui.CollectionView

Assembly: DevExpress.Maui.CollectionView.dll

NuGet Package: DevExpress.Maui.CollectionView

Declaration

public event EventHandler<CancelItemEventArgs> GroupCollapsing

Event Data

The GroupCollapsing event's data class is CancelItemEventArgs. The following properties provide information specific to this event:

Property	Description
Cancel	Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.
ItemHandle	Returns the handle of the processed item.

Remarks

The GroupCollapsing event is raised before a group of data items is collapsed from UI or code (CollapseGroup). You can handle this event and set its parameter’s Cancel inherited property to true to prevent a group from being collapsed.

When you call the CollapseAllGroups method, the GroupCollapsing event is raised for each group.

After a group has been collapsed, the GroupCollapsed event is raised.