OLE Drag and Drop
RadMap is capable of performing drag and drop operation using the native OLE drag and drop support. The example below handles a scenario in which pins are dragged from the map to a RadListView control.
Figure 1: Drag and Drop Between RadMap and RadListView
In order to achieve the desired result the MouseMove, MouseUp, and DragEnter events need to be handled by RadMap. The drag operation will be started in the handler of the MouseMove event. RadListView needs to be subscribed to the DragEnter and DragDrop events.
This example uses the OpenStreetMapProvider and utilizes the MapPin objects added to a predefined layer.
RadMap allows panning out of the box. The built-in panning functionality will interfere with the custom drag and drop behavior and it needs to be disabled for the duration of the drag and drop operation.
Subscribe to Events
public DragAndDropRadMapForm()
{
InitializeComponent();
this.SetupProviders();
this.SetupLayer();
this.SetupLegend();
this.SetupData();
this.radMap1.AllowDrop = true;
this.radListView1.AllowDrop = true;
this.radMap1.MouseMove += RadMap1_MouseMove;
this.radMap1.DragEnter += RadMap1_DragEnter;
this.radListView1.DragEnter += RadListView1_DragEnter;
this.radListView1.DragDrop += RadListView1_DragDrop;
}
Public Sub New()
InitializeComponent()
Me.SetupProviders()
Me.SetupLayer()
Me.SetupLegend()
Me.SetupData()
Me.radMap1.AllowDrop = True
Me.radListView1.AllowDrop = True
AddHandler Me.radMap1.MouseMove, AddressOf RadMap1_MouseMove
AddHandler Me.radMap1.DragEnter, AddressOf RadMap1_DragEnter
AddHandler Me.radListView1.DragEnter, AddressOf RadListView1_DragEnter
AddHandler Me.radListView1.DragDrop, AddressOf RadListView1_DragDrop
End Sub
Handling Events
The RadMapElement.EnablePanning property will be set in the MouseMove event handler. RadListView will read the Text property of the dragged pin and add a new member item in its Items collection.
Drag and Drop Events
private void RadMap1_MouseMove(object sender, MouseEventArgs e)
{
if (!(e.Button == MouseButtons.Left))
{
return;
}
PointL point = new PointL(e.X - this.radMap1.MapElement.PanOffset.Width, e.Y - this.radMap1.MapElement.PanOffset.Height);
MapPin pin = this.radMap1.Layers.HitTest(point) as MapPin;
if (pin != null)
{
this.radMap1.InputBehavior.OnMouseUp(e);
((RadMap)sender).DoDragDrop(pin, DragDropEffects.Move);
}
}
private void RadMap1_DragEnter(object sender, DragEventArgs e)
{
MapPin pin = e.Data.GetData(typeof(MapPin)) as MapPin;
e.Effect = pin == null ? DragDropEffects.None : DragDropEffects.Move;
}
private void RadListView1_DragEnter(object sender, DragEventArgs e)
{
MapPin pin = e.Data.GetData(typeof(MapPin)) as MapPin;
e.Effect = pin == null ? DragDropEffects.None : DragDropEffects.Move;
}
private void RadListView1_DragDrop(object sender, DragEventArgs e)
{
MapPin pin = e.Data.GetData(typeof(MapPin)) as MapPin;
this.radMap1.Layers["Pins"].Remove(pin);
this.radListView1.Items.Add(pin.Text);
this.radMap1.Refresh();
}
Private Sub RadMap1_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs)
If Not (e.Button = MouseButtons.Left) Then
Return
End If
Dim point As PointL = New PointL(e.X - Me.radMap1.MapElement.PanOffset.Width, e.Y - Me.radMap1.MapElement.PanOffset.Height)
Dim pin As MapPin = TryCast(Me.radMap1.Layers.HitTest(point), MapPin)
If pin IsNot Nothing Then
Me.radMap1.InputBehavior.OnMouseUp(e)
(CType(sender, RadMap)).DoDragDrop(pin, DragDropEffects.Move)
End If
End Sub
Private Sub RadMap1_DragEnter(ByVal sender As Object, ByVal e As DragEventArgs)
Dim pin As MapPin = TryCast(e.Data.GetData(GetType(MapPin)), MapPin)
e.Effect = If(pin Is Nothing, DragDropEffects.None, DragDropEffects.Move)
End Sub
Private Sub RadListView1_DragEnter(ByVal sender As Object, ByVal e As DragEventArgs)
Dim pin As MapPin = TryCast(e.Data.GetData(GetType(MapPin)), MapPin)
e.Effect = If(pin Is Nothing, DragDropEffects.None, DragDropEffects.Move)
End Sub
Private Sub RadListView1_DragDrop(ByVal sender As Object, ByVal e As DragEventArgs)
Dim pin As MapPin = TryCast(e.Data.GetData(GetType(MapPin)), MapPin)
Me.radMap1.Layers("Pins").Remove(pin)
Me.radListView1.Items.Add(pin.Text)
Me.radMap1.Refresh()
End Sub