Using Custom Editor
This following snippet demonstrates how to create and replace the standard spin editor with a track bar editor.
Figure 1: TrackBar Editor
All property grid editors inherit from BaseInputEditor. So, you have to inherit from this class and override several methods:
Creating Custom Editor
public class PropertyGridTrackBarEditor : BaseInputEditor
{
public override object Value
{
get
{
RadTrackBarElement editor = (RadTrackBarElement)this.EditorElement;
return editor.Value;
}
set
{
RadTrackBarElement editor = (RadTrackBarElement)this.EditorElement;
if (value != null && value != DBNull.Value)
{
editor.Value = Convert.ToInt32(value);
}
else
{
editor.Value = 0;
}
}
}
public override void BeginEdit()
{
base.BeginEdit();
this.EditorElement.Focus();
((RadTrackBarElement)this.EditorElement).ValueChanged += new EventHandler(TrackBarEditor_ValueChanged);
}
void TrackBarEditor_ValueChanged(object sender, EventArgs e)
{
PropertyGridItemElement owner = this.OwnerElement as PropertyGridItemElement;
if (owner != null)
{
owner.PropertyTableElement.RaiseValueChanged(EventArgs.Empty);
}
}
public override bool EndEdit()
{
((RadTrackBarElement)this.EditorElement).ValueChanged -= TrackBarEditor_ValueChanged;
return base.EndEdit();
}
protected override RadElement CreateEditorElement()
{
return new RadTrackBarElement();
}
public override Type DataType
{
get { return typeof(int); }
}
}
Public Class PropertyGridTrackBarEditor
Inherits BaseInputEditor
Public Overrides Property Value() As Object
Get
Dim editor As RadTrackBarElement = CType(Me.EditorElement, RadTrackBarElement)
Return editor.Value
End Get
Set(ByVal value As Object)
Dim editor As RadTrackBarElement = CType(Me.EditorElement, RadTrackBarElement)
If Not value Is Nothing AndAlso Not value Is DBNull.Value Then
editor.Value = Convert.ToInt32(value)
Else
editor.Value = 0
End If
End Set
End Property
Public Overrides Sub BeginEdit()
MyBase.BeginEdit()
Me.EditorElement.Focus()
AddHandler (CType(EditorElement, RadTrackBarElement)).ValueChanged, AddressOf TrackBarEditor_ValueChanged
End Sub
Private Sub TrackBarEditor_ValueChanged(ByVal sender As Object, ByVal e As EventArgs)
Dim owner As PropertyGridItemElement = TryCast(Me.OwnerElement, PropertyGridItemElement)
If owner IsNot Nothing Then
owner.PropertyTableElement.RaiseValueChanged(EventArgs.Empty)
End If
End Sub
Public Overrides Function EndEdit() As Boolean
RemoveHandler (CType(Me.EditorElement, RadTrackBarElement)).ValueChanged, AddressOf TrackBarEditor_ValueChanged
Return MyBase.EndEdit()
End Function
Protected Overrides Function CreateEditorElement() As RadElement
Return New RadTrackBarElement()
End Function
Public Overrides ReadOnly Property DataType() As Type
Get
Return GetType(Integer)
End Get
End Property
End Class
The EditorRequired event is the correct place to replace the default editor:
Replace Editor
void radPropertyGrid1_EditorRequired(object sender, PropertyGridEditorRequiredEventArgs e)
{
if (e.EditorType == typeof(PropertyGridSpinEditor))
{
e.EditorType = typeof(PropertyGridTrackBarEditor);
}
}
Private Sub radPropertyGrid1_EditorRequired(ByVal sender As Object, ByVal e As PropertyGridEditorRequiredEventArgs)
If e.EditorType Is GetType(PropertyGridSpinEditor) Then
e.EditorType = GetType(PropertyGridTrackBarEditor)
End If
End Sub