SchedulerControl.AppointmentResize Event

Occurs when an appointment’s interval is modified by dragging its borders.

Namespace: DevExpress.Xpf.Scheduling

Assembly: DevExpress.Xpf.Scheduling.v18.2.dll

Declaration

C#

public event AppointmentItemResizeEventHandler AppointmentResize

VB.NET

Public Event AppointmentResize As AppointmentItemResizeEventHandler

Event Data

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

Property	Description
Allow	Gets or sets whether the appointment can be resized.
HitInterval	Retrieves the datetime range to which the appointment’s side is moved.
HitResource	Gets the resource assigned to cells to which an appointment’s side is moved.
ResizedSide	Indicates which appointment side is being moved when the appointment is resized.
State	Indicates the stage of the resize action.
ViewModel	Provides access to the View Model for the resized appointment.

Remarks

The event argument provides an information on a stage of resizing action, the resource and time interval associated with time cells to which the appointment’s edge is moved, and also indicates which side of the appointment is moved. The AppointmentItemResizeEventArgs.ViewModel property provides access to the modified appointment.

The original appointment (before resizing) is accessible using the AppointmentEditViewModelBase.Appointment property of the AppointmentDragResizeViewModel object contained in the AppointmentItemDragDropEventArgs.ViewModels collection.

To cancel resizing, set the AppointmentItemResizeEventArgs.Allow property to false.

Example

This code handles the SchedulerControl.AppointmentResize event to determine whether a resize operation is allowed based on the custom field value. If a custom field “FixedTime” exists and is set to false, resizing downwards (i.e., the AppointmentItemResizeEventArgs.ResizedSide is ResizedSide.AtStartTime) is not allowed. A “FixedTime” field value set to true cancels any resizing.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-handle-appointment-drag-drop-resize-operations-t605963.

MainViewModel.cs

public void OnAppointmentResize(DevExpress.Xpf.Scheduling.AppointmentItemResizeEventArgs e)
{
    if (e.ViewModel.CustomFields["FixedTime"] != null)
        if ((bool)e.ViewModel.CustomFields["FixedTime"] ||
            e.ResizedSide == DevExpress.XtraScheduler.ResizedSide.AtStartTime)
            e.Allow = false;
}

MainViewModel.vb

Public Sub OnAppointmentResize(ByVal e As DevExpress.Xpf.Scheduling.AppointmentItemResizeEventArgs)
    If e.ViewModel.CustomFields("FixedTime") IsNot Nothing Then
        If CBool(e.ViewModel.CustomFields("FixedTime")) OrElse e.ResizedSide = DevExpress.XtraScheduler.ResizedSide.AtStartTime Then
            e.Allow = False
        End If
    End If
End Sub