DockLayoutManager.DockItemHiding Event

Fires before a dock item is auto-hidden, and allows you to prevent this action.

Namespace: DevExpress.Xpf.Docking

Assembly: DevExpress.Xpf.Docking.v24.2.dll

NuGet Package: DevExpress.Wpf.Docking

Declaration

C#

public event DockItemCancelEventHandler DockItemHiding

VB.NET

Public Event DockItemHiding As DockItemCancelEventHandler

Event Data

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

Property	Description
Cancel	Gets or sets whether the current operation must be canceled.
Handled	Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. Inherited from RoutedEventArgs.
Item	Gets the currently processed item. Inherited from ItemEventArgs.
OriginalSource	Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class. Inherited from RoutedEventArgs.
RoutedEvent	Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. Inherited from RoutedEventArgs.
Source	Gets or sets a reference to the object that raised the event. Inherited from RoutedEventArgs.

The event data class exposes the following methods:

Method	Description
InvokeEventHandler(Delegate, Object)	When overridden in a derived class, provides a way to invoke event handlers in a type-specific way, which can increase efficiency over the base implementation. Inherited from RoutedEventArgs.
OnSetSource(Object)	When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes. Inherited from RoutedEventArgs.

Remarks

To prevent a dock item from being auto-hidden, set the event’s Cancel parameter to true. An alternative way to disable this functionality is to set the BaseLayoutItem.AllowHide option to false. After an item has been auto-hidden, the DockLayoutManager.DockItemHidden event fires.

Auto-hidden items can be accessed via the DockLayoutManager.AutoHideGroups collection.