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AppointmentsDragging Event

Event fired when an appointment or group of appointments is dragged by the end user.
Syntax
'Declaration
 
Public Event AppointmentsDragging As AppointmentsDraggingHandler
public event AppointmentsDraggingHandler AppointmentsDragging
Event Data

The event handler receives an argument of type AppointmentsDraggingEventArgs containing data related to this event. The following AppointmentsDraggingEventArgs properties provide information specific to this event.

PropertyDescription
AllowCopy Returns or sets whether copies of the appointment(s) can be made during the drag operation.
AllowOwnerChange Returns or sets whether the appointment(s) can be dragged to a different Owner than the one for which the drag operation was initiated.
Appointments Returns a read-only collection of the appointments that are being dragged.
Cancel (Inherited from System.ComponentModel.CancelEventArgs) 
CopyCursor Returns or sets the cursor which is displayed during the drag operation when the dragged items are being copied.
HasCopies Returns a boolean indicating whether the drag operation currently contains copied Appointment.
InitialDateTime (Inherited from Infragistics.Win.UltraWinSchedule.CancelableAppointmentDragEventArgs)Returns the DateTime over which the cursor was positioned when the operation was initiated.
InitialOwner Returns the Owner of the appointment(s) at the time the drag operation was initiated.
MoveCursor Returns or sets the cursor which is displayed during the drag operation when the items are being moved without being copied.
NewDateTime (Inherited from Infragistics.Win.UltraWinSchedule.CancelableAppointmentDragEventArgs)Returns the DateTime closest to the current cursor position.
NewOwner Returns the new Owner of the appointment(s), based on the current cursor position.
Phase Returns the phase of the drag operation that this event firing represents, i.e., whether it is beginning, in progress, or ending.
Remarks

The AppointmentsDragging event notifies a listener during all phases of an appointment drag operation. The Phase property identifies whether the drag operation has just been initiated, is continuing because the end user is moving the mouse while the logical left button is pressed, or is about to be committed because the end user released the mouse. The event can be canceled during any phase, in which case the dragged appointment(s) are returned to their pre-drag state. A listener can use this event for the following purposes:

  • Prevent the appointment(s) from being dragged to a different Owner (see AllowOwnerChange)
  • Prevent copies of the the appointment(s) from being made during the drag operation (see AllowCopy)
  • Initiate an external drag/drop operation (for example, drag appointments to a different control) by canceling the event for the 'Beginning' phase and calling the control's DoDragDrop method
  • Specify the cursor to be displayed during the drag operation (see MoveCursor, CopyCursor)
  • Trigger a standard .NET drag/drop operation to (for example) a different control.

If this event is not canceled, the AppointmentsDragDrop event is fired at the end of the drag operation.

Appointments can be dragged to another control by canceling the AppointmentsDragging event, and calling the DoDragDrop method on the schedule control from which the appointments are being dragged. Note that the drop target control must in this case have its AllowDrop property set to true, and the developer must also handle its DragDrop event in order to process the data.

Example
The following code sample demonstrates how to use the AppointmentsDragging event to conditionally prevent appointments from being dragged based on various criteria:

For an overview of how to handle events in Visual Basic or Visual C#, see Event Handlers in Visual Basic and Visual C#. For specific information and code examples illustrating how to consume events in your application, see Consuming Events in the .NET Framework Developer's Guide.

Imports Infragistics.Win
Imports Infragistics.Win.UltraWinSchedule
Imports System.Diagnostics


    AddHandler Me.monthViewSingle.AppointmentsDragging, AddressOf OnAppointmentsDragging
    
    Private Sub OnAppointmentsDragging(ByVal sender As Object, ByVal e As AppointmentsDraggingEventArgs)

        '  Get a reference to the schedule control and the associated UltraCalendarInfo
        Dim control As UltraScheduleControlBase = sender
        Dim calendarInfo As UltraCalendarInfo = control.CalendarInfo

        '  Disallow copying of appointments this prevents copies of the
        '  dragged appointments from being made when the user presses the
        '  Control key.
        e.AllowCopy = False

        '  Disallow dragging the appointments to the unassigned owner,
        '  if they originally belonged to a different owner.
        If (Not (e.NewOwner Is e.InitialOwner) AndAlso e.NewOwner.IsUnassigned) Then
            e.AllowOwnerChange = False
        End If

        '  If the delta between the initial date and the new date is more
        '  than seven days, prompt the user to make sure they want to continue.
        '
        '  To avoid stealing capture (and thus terminating the drag operation),
        '  we can only do this during the final phase of the drag operation,
        '  so check e.Phase to make sure that is the case.
        If e.Phase = AppointmentDragPhase.Ending Then

            Dim span As TimeSpan = e.NewDateTime.Date.Subtract(e.InitialDateTime.Date)
            Dim delta As Int32 = Math.Abs(span.TotalDays)

            If (delta > 7.0F) Then

                Dim sb As StringBuilder = New StringBuilder()
                sb.AppendLine("The following appointment(s) are being dragged by more than seven days from their initial start time(s):")
                sb.AppendLine(Environment.NewLine)

                Dim appointment As Appointment
                For Each appointment In e.Appointments
                    sb.AppendLine(String.Format("{0} ({1})", appointment.Subject, appointment.StartDateTime.ToShortDateString()))
                Next

                sb.AppendLine(Environment.NewLine)
                sb.AppendLine("Do you want to move the appointment(s)?")

                Dim result As DialogResult = MessageBox.Show(sb.ToString(), "AppointmentsDragging", MessageBoxButtons.YesNo)

                If (result = System.Windows.Forms.DialogResult.No) Then e.Cancel = True
            End If
        End If

    End Sub
using Infragistics.Win;
using Infragistics.Win.UltraWinSchedule;
using System.Diagnostics;

    this.monthViewSingle.AppointmentsDragging += new AppointmentsDraggingHandler(OnAppointmentsDragging);

    private void OnAppointmentsDragging(object sender, AppointmentsDraggingEventArgs e)
    {
        //  Get a reference to the schedule control and the associated UltraCalendarInfo
        UltraScheduleControlBase control = sender as UltraScheduleControlBase;
        UltraCalendarInfo calendarInfo = control.CalendarInfo;

        //  Disallow copying of appointments; this prevents copies of the
        //  dragged appointments from being made when the user presses the
        //  Control key.
        e.AllowCopy = false;

        //  Disallow dragging the appointments to the unassigned owner,
        //  if they originally belonged to a different owner.
        if ( e.NewOwner != e.InitialOwner && e.NewOwner.IsUnassigned )
            e.AllowOwnerChange = false;

        //  If the delta between the initial date and the new date is more
        //  than seven days, prompt the user to make sure they want to continue.
        //
        //  To avoid stealing capture (and thus terminating the drag operation),
        //  we can only do this during the final phase of the drag operation,
        //  so check e.Phase to make sure that is the case.
        if ( e.Phase == AppointmentDragPhase.Ending )
        {
            TimeSpan span = e.NewDateTime.Date.Subtract( e.InitialDateTime.Date );
            int delta = (int)Math.Abs(span.TotalDays);

            if ( delta > 7f )
            {
                StringBuilder sb = new StringBuilder();
                sb.AppendLine( "The following appointment(s) are being dragged by more than seven days from their initial start time(s):" );
                sb.AppendLine( Environment.NewLine );

                foreach( Appointment appointment in e.Appointments )
                {
                    sb.AppendLine( string.Format("{0} ({1})", appointment.Subject, appointment.StartDateTime.ToShortDateString()) );
                }

                sb.AppendLine( Environment.NewLine );
                sb.AppendLine( "Do you want to move the appointment(s)?" );

                DialogResult result = MessageBox.Show( sb.ToString(), "AppointmentsDragging", MessageBoxButtons.YesNo );

                if ( result == DialogResult.No )
                    e.Cancel = true;                    
            }
        }
    }
Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

See Also