AppointmentDragResizeViewModel Class

View model used in the drag-and-drop and resize operations, containing appointment property values which are modified during an action.

Namespace: DevExpress.Xpf.Scheduling

Assembly: DevExpress.Xpf.Scheduling.v22.2.dll

NuGet Package: DevExpress.Wpf.Scheduling

Declaration

C#

public class AppointmentDragResizeViewModel :
    AppointmentEditViewModelBase

VB.NET

Public Class AppointmentDragResizeViewModel
    Inherits AppointmentEditViewModelBase

Related API Members

The following members return AppointmentDragResizeViewModel objects:

• AppointmentItemResizeEventArgs.ViewModel

Remarks

The AppointmentDragResizeViewModel view model temporarily holds updated values of appointment properties modified in drag-and-drop or resize operations. The original appointment is available using the AppointmentEditViewModelBase.Appointment property. After the operation is complete, view model values are used to update the original appointment.

Example

This code snippet handles the SchedulerControl.AppointmentDrop event and determines whether the AppointmentDragResizeViewModel.Start property of the first appointment model in the collection of dragged appointments equals the SchedulerItemBase.Start property of the original appointment, available using the AppointmentEditViewModelBase.Appointment property. If this condition is met, a drop operation is allowed.

This restriction applies only to appointments with the “FixedTime” custom field value set to true.

Visually, appointments can only move between resources, preserving their Start and End times.

View Example

MainViewModel.cs

public void OnAppointmentDrop(DevExpress.Xpf.Scheduling.AppointmentItemDragDropEventArgs e)
{
    AppointmentDragResizeViewModel draggedViewModel = e.ViewModels.First() as AppointmentDragResizeViewModel;
    if (draggedViewModel.CustomFields["FixedTime"] != null)
        if ((bool)draggedViewModel.CustomFields["FixedTime"] &&
            (draggedViewModel.Start != draggedViewModel.Appointment.Start))
            e.Allow = false;
}

MainViewModel.vb

Public Sub OnAppointmentDrop(ByVal e As DevExpress.Xpf.Scheduling.AppointmentItemDragDropEventArgs)
    Dim draggedViewModel As AppointmentDragResizeViewModel = TryCast(e.ViewModels.First(), AppointmentDragResizeViewModel)
    If draggedViewModel.CustomFields("FixedTime") IsNot Nothing Then
        If CBool(draggedViewModel.CustomFields("FixedTime")) AndAlso (draggedViewModel.Start <> draggedViewModel.Appointment.Start) Then
            e.Allow = False
        End If
    End If
End Sub

Inheritance

Object

BindableBase

ViewModelBase

AppointmentEditViewModelBase

AppointmentDragResizeViewModel