GanttControlOptionsCustomization.AllowModifyTasks Property

Gets or sets whether users can modify a task’s start and finish dates in the chart: resize its bounds or move it to a new time slot.

Namespace: DevExpress.XtraGantt.Options

Assembly: DevExpress.XtraGantt.v21.2.dll

NuGet Packages: DevExpress.Win.Design, DevExpress.Win.Gantt

Declaration

C#

[DefaultValue(DefaultBoolean.Default)]
[XtraSerializableProperty]
public DefaultBoolean AllowModifyTasks { get; set; }

VB.NET

<XtraSerializableProperty>
<DefaultValue(DefaultBoolean.Default)>
Public Property AllowModifyTasks As DefaultBoolean

Property Value

Type	Default	Description
DefaultBoolean	Default	True, if users can modify a task’s start and finish dates; otherwise, Default or False.

Available values:

Name	Description
True	true. DefaultBoolean.True has a constant value of 0, while the standard true value corresponds to a value of 1. In Visual Basic, do not use implicit conversion of Boolean values to DefaultBoolean, and vice versa, as the conversion may produce incorrect results.
False	false. DefaultBoolean.False has a constant value of 1, while the standard false value corresponds to a value of 0. In Visual Basic, do not use implicit conversion of Boolean values to DefaultBoolean, and vice versa, as the conversion may produce incorrect results.
Default	The default behavior determined by the control’s logic.

Property Paths

You can access this nested property as listed below:

Object Type	Path to AllowModifyTasks
GanttControl	.OptionsCustomization .AllowModifyTasks

Remarks

If the AllowModifyTasks option is enabled, users can reschedule a task. Users can use the mouse pointer to resize its duration or drag it to a new time slot.

To resize a task, move the mouse pointer over a task’s edge.

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:

• TaskMoveStarted — fires when a user starts to move a task.
• TaskMoving — repeatedly fires when a user moves a task.
• TaskMoveCanceled — fires when a user presses Esc to cancel the operation.
• TaskMoveCompleted — fires when a user finishes moving a task. Allows you to cancel the operation.

• TaskMoved — fires when a task is successfully moved.

• TaskFinishDateModificationStarted — fires when a user starts to modify a task’s finish date.

• TaskFinishDateModification — repeatedly fires when a user modifies a task’s finish date.
• TaskFinishDateModificationCanceled — fires when a user presses Esc to cancel the operation.
• TaskFinishDateModificationCompleted — fires when a user finishes to modify a finish date. Allows you to cancel the operation.
• TaskFinishDateModified — fires when a task’s finish date is successfully modified.

See Interactive Editing for more information.