xamarin-docs/Xamarin/Scheduler/drag-and-drop-appointments.md

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Appointment Drag and Drop in Xamarin Scheduler (SfSchedule)

Appointments can be rescheduled using the drag and drop operation. To perform drag-and-drop operations within the schedule, enable the AllowAppointmentDrag property of SfSchedule.

{% tabs %} {% highlight xaml %} <schedule:SfSchedule x:Name=“schedule” ScheduleView="WeekView" AllowAppointmentDrag="true"> </schedule:SfSchedule> {% endhighlight %} {% highlight c# %} schedule.AllowAppointmentDrag = true; {% endhighlight %} {% endtabs %}

Handle dragging based on the appointment

Using AppointmentDragStarting event, you can get the appointment details and handle whether the appointment can be draggable or not. This event will be triggered when the appointment is started dragging. The AppointmentDragStartingEventArgs argument contains the following properties.

Appointment - Gets the dragged appointment details. Cancel- Appointment dragging can be handled (enable/disable) using this boolean property.

{% tabs %} {% highlight c# %} schedule.AppointmentDragStarting += Schedule_AppointmentDragStarting;

...

private void Schedule_AppointmentDragStarting(object sender, AppointmentDragStartingEventArgs e) { var appointment = e.Appointment; e.Cancel = false; } {% endhighlight %} {% endtabs %}

Disabling dragging when the appointment is AllDay appointment

Using Cancel property in the AppointmentDragStartingEventArgs argument of Schedule AppointmentDragStarting event, you can enable/disable the appointment dragging based on the requirement. In the below code, appointment dragging is disabled when the appointment is AllDay appointment.

{% tabs %} {% highlight c# %} schedule.AppointmentDragStarting += Schedule_AppointmentDragStarting;

...

private void Schedule_AppointmentDragStarting(object sender, AppointmentDragStartingEventArgs e) { var appointment = e.Appointment as ScheduleAppointment;

  if (appointment.IsAllDay)
  {
        e.Cancel = true;
  }

} {% endhighlight %} {% endtabs %}

Get the dragging appointment position

Using AppointmentDragOver event, you can get the dragging appointment details, position and time of the particular location. The event will be continuously triggered when the appointment is being dragged. The AppointmentDragEventArgs argument contains the following properties.

Appointment - Gets the details of the appointment to be dropped. DraggingPoint- Gets the dragging point (X, Y) of the appointment in Schedule. DraggingTime- Gets the dragging time of the appointment in Schedule

{% tabs %} {% highlight c# %} schedule.AppointmentDragOver += Schedule_AppointmentDragOver;

...

private void Schedule_AppointmentDragOver(object sender, AppointmentDragEventArgs e) { var appointment = e.Appointment; var draggingPoint = e.DraggingPoint; var draggingTime = e.DraggingTime; } {% endhighlight %} {% endtabs %}

Displaying alert while dragging appointment over the blocked time slots

By using the draggingPoint and draggingTime properties in the AppointmentDragEventArgs of Schedule AppointmentDragOver event you can get the current position and time of dragging appointment. In the below code, Indicating the message while dragging over the Schedule NonAccessibleBlock.

{% tabs %} {% highlight c# %} schedule.AppointmentDragOver += Schedule_AppointmentDragOver;

...

private void Schedule_AppointmentDragOver(object sender, AppointmentDragEventArgs e) { //// checking whether dragging appointment time within NonAccessibleBlock if (schedule.WorkWeekViewSettings.NonAccessibleBlocks[0].StartTime == e.DraggingTime.Hour || (schedule.WorkWeekViewSettings.NonAccessibleBlocks[0].StartTime - 1 == e.DraggingTime.Hour && e.DraggingTime.Minute > 0)) { label.Text = "Cannot be moved to blocked time slots"; } } {% endhighlight %} {% endtabs %}

Handle appointment dropping

Using AppointmentDrop event you can get the dropping appointment details, position, time and you can handle whether the appointment can be dropped to the specific position or not. This event will trigger after dropping the appointment. The AppointmentDropEventArgs argument contains the following properties.

Appointment - Gets the details of the appointment to be dropped. Cancel- Appointment dropping can be handled (enable / disable) using this Boolean property. DropTime- Gets the dropped time of the appointment in Schedule

{% tabs %} {% highlight c# %} schedule.AppointmentDrop += Schedule_AppointmentDrop;

...

private void Schedule_AppointmentDrop(object sender, AppointmentDropEventArgs e) { var appointment = e.Appointment; e.Cancel = false; var dropTime = e.DropTime; } {% endhighlight %} {% endtabs %}

Disabling dropping when dropping appointment within the Non-Accessible region

Using Cancel property in the AppointmentDropEventArgs argument of Schedule AppointmentDrop event, you can enable/disable the appointment dropping based on the requirement. In the below code, appointment dropping is disabled while dropping in the Non-Accessible block region.

{% tabs %} {% highlight c# %} schedule.AppointmentDrop += Schedule_AppointmentDrop;

...

private void Schedule_AppointmentDrop(object sender, AppointmentDropEventArgs e) { //// checking whether dropping appointment time within NonAccessibleBlock if (schedule.WorkWeekViewSettings.NonAccessibleBlocks[0].StartTime == e.DropTime.Hour || (schedule.WorkWeekViewSettings.NonAccessibleBlocks[0].StartTime - 1 == e.DropTime.Hour && e.DropTime.Minute > 0)) { e.Cancel = true; } } {% endhighlight %} {% endtabs %}

Customizing the Drag and Drop environment

Using DragDropSettings property of schedule, you can handle the behavior of drag and drop in Schedule.

{% tabs %} {% highlight xaml %} <schedule:SfSchedule x:Name="schedule" ScheduleView="WeekView"> schedule:SfSchedule.DragDropSettings <schedule:DragDropSettings AllowNavigate="true" AllowScroll="true" ShowTimeIndicator="true"> </schedule:DragDropSettings> </schedule:SfSchedule.DragDropSettings> </schedule:SfSchedule> {% endhighlight %} {% highlight c# %} DragDropSettings dragDropSettings = new DragDropSettings(); dragDropSettings.AllowNavigate = true; dragDropSettings.AllowScroll = true; var timeSpan = new TimeSpan(0, 0, 0, 1, 0); dragDropSettings.AutoNavigationDelay = timeSpan; dragDropSettings.ShowTimeIndicator = true; dragDropSettings.TimeIndicatorStyle = timeIndicatorStyle; schedule.DragDropSettings = dragDropSettings; {% endhighlight %} {% endtabs %}

Disabling navigation when dragging appointment

Using AllowNavigate boolean property can handle the Appointment dragging, whether navigate to next/previous view or not while dragging the appointment to the endpoint of the current view in Schedule. Default value of the AllowNavigate property is true and Schedule will navigate to next/previous view when dragging the appointment to the endpoint of the current view.

{% tabs %} {% highlight c# %} dragDropSettings.AllowNavigate = false; {% endhighlight %} {% endtabs %}

Handling navigation delay while holding dragged appointment

Using AutoNavigationDelay TimeSpan property you can handle the navigation time when navigating to next/previous view while holding the dragged appointment.

{% tabs %} {% highlight c# %} var timeSpan = new TimeSpan(0, 0, 0, 1, 0); dragDropSettings.AutoNavigationDelay = timeSpan; {% endhighlight %} {% endtabs %}

Disabling scroll when dragging appointment

Using AllowScroll boolean property you can handle the Appointment dragging, whether scrolling (below/above) the Schedule or not while dragging the appointment to the endpoint of the current view in Schedule. Default value of the AllowScroll property is true.

{% tabs %} {% highlight c# %} dragDropSettings.AllowScroll = false; {% endhighlight %} {% endtabs %}

Disabling dragging time indicator

ShowTimeIndicator - Using this boolean property can handle the time indicator whether it should visible or not, which shows the dragged appointment current position time in time text slots. Default value of the ShowTimeIndicator property is true.

{% tabs %} {% highlight c# %} dragDropSettings.ShowTimeIndicator = false; {% endhighlight %} {% endtabs %}

Customize appearance of dragging Time Indicator

Using TimeIndicatorStyle property can handle the time indicator style which contains TextColor, TextSize and TextFormat.

{% tabs %} {% highlight xaml %} <schedule:SfSchedule x:Name="schedule" ScheduleView="WeekView"> schedule:SfSchedule.DragDropSettings schedule:DragDropSettings schedule:DragDropSettings.TimeIndicatorStyle <schedule:TimeIndicatorStyle TextColor="Red" TextSize="13" TextFormat="hh:mm"> </schedule:TimeIndicatorStyle> </schedule:DragDropSettings.TimeIndicatorStyle> </schedule:DragDropSettings> </schedule:SfSchedule.DragDropSettings> </schedule:SfSchedule> {% endhighlight %} {% highlight c# %} TimeIndicatorStyle timeIndicatorStyle = new TimeIndicatorStyle(); timeIndicatorStyle.TextColor = Color.Red; timeIndicatorStyle.TextSize = 15; timeIndicatorStyle.TextFormat = "hh : mm"; dragDropSettings.TimeIndicatorStyle = timeIndicatorStyle; {% endhighlight %} {% endtabs %}

Notes

• While dropping appointment to AllDay panel from time slots, appointment start and end time will change to 12.00 AM.
• While dropping appointment to time slots from AllDay panel, appointment duration will change as one (1) hour from the dropped time.
• Doesn't support control to control drag and drop.

Get resource item at appointment drop

Using the DropResourceItem property that is in the AppointmentDrop event, you can get the dropping ResourceItem details. It will return schedule resource item value for timeline view with resource view mode as Absolute using the property of AppointmentDropEventArgs.

{% tabs %} {% highlight c# %} schedule.AppointmentDrop += Schedule_AppointmentDrop;

...

private void Schedule_AppointmentDrop(object sender, AppointmentDropEventArgs e) { var changedResource = e.DropResourceItem; App.Current.MainPage.DisplayAlert("", "Resorce change into " + (changedResource as Employee).Name, "ok"); } {% endhighlight %} {% endtabs %}

N> You can refer to our Xamarin Scheduler feature tour page for its groundbreaking feature representations. You can also explore our Xamarin Scheduler example to understand how to schedule and manage appointments.

See also

How to get dropped resource in Xamarin.Forms Schedule (SfSchedule)

How to drag appointment to the exact hour in Schedule (SfSchedule) Xamarin.Forms