GanttControl.TaskDependencyModification Event

Repeatedly fires when a user modifies a task’s dependency. This event only fires when a user modifies a task in the chart. When the user modifies a task in the task list, the event does not fire.

Namespace : DevExpress.XtraGantt

Assembly : DevExpress.XtraGantt.v25.2.dll

NuGet Package : DevExpress.Win.Gantt

csharp

[DXCategory("Events")]
public event TaskDependencyModificationEventHandler TaskDependencyModification

<DXCategory("Events")>
Public Event TaskDependencyModification As TaskDependencyModificationEventHandler

Event Data

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

Property	Description
Allow	Gets or sets whether users are allowed to modify the dependency.
Cancel	Allows you to cancel the operation.
ChangeType	Gets the type of the operation. Inherited from TaskDependencyModificationEventArgs.
OriginalSuccessorNode	Gets the processed dependency’s original (before the operation) successor node. Inherited from TaskDependencyModificationEventArgs.
OriginalSuccessorTask	Gets the processed dependency’s original (before the operation) successor task. Inherited from TaskDependencyModificationEventArgs.
PredecessorNode	Gets the processed dependency’s current (during the operation) predecessor node. Inherited from TaskDependencyModificationEventArgs.
PredecessorTask	Gets the processed dependency’s current (during the operation) predecessor task. Inherited from TaskDependencyModificationEventArgs.
SuccessorNode	Gets the processed dependency’s current (during the operation) successor node. Inherited from TaskDependencyModificationEventArgs.
SuccessorTask	Gets the processed dependency’s current (during the operation) successor task. Inherited from TaskDependencyModificationEventArgs.
Type	Gets the type of the processed dependency. Inherited from TaskDependencyModificationEventArgs.

Remarks

If the AllowModifyDependencies option is enabled, users can change a task’s predecessor or successor. Users can remove a dependency or attach it to another task if the mouse pointer hovers over the dependency arrow. To create a new dependency, use pointers displayed at task edges.

Note

The Editable option must be enabled and the ReadOnly option must be disabled to allow users to modify tasks.

You can handle the following events to customize an operation:

TaskDependencyModification — repeatedly fires when the user modifies a task’s dependency.
TaskDependencyModificationCanceled — fires when the user presses Esc to cancel the operation.
TaskDependencyModificationCompleted — fires when a user finishes modifying a dependency. Allows you to cancel the operation.
TaskDependencyModified — fires when a task’s dependency is successfully modified.

See Interactive Editing for more information.