[RESOLVED] Problem Overriding OnMouseMove

[Hamish]

I'm creating a "ColorMap Canvas", i.e. a canvas where clicking the Canvas will return the color of the corresponding picture. (I'm actually adapting Atheist's PictureBox_ColorMap control for use with a Canvas)

I've got the following code:

Protected Overrides Sub OnMouseMove(ByVal e As MouseButtonEventArgs)
   Dim p As System.Windows.Point = e.GetPosition(Me)
   MyBase.OnMouseMove(e)
   If _RaiseEventOnMouseMove Then
      If Not _ColorMap Is Nothing AndAlso p.X <= _ColorMap.Width AndAlso p.Y <= _ColorMap.Height Then
         RaiseEvent ColorMapMouseMove(Me, _ColorMap.GetPixel(CInt(p.X), CInt(p.Y)))
      Else
         RaiseEvent ColorMapMouseMove(Me, Nothing)
      End If
   End If
End Sub

The IDE gives me the error:
"sub 'OnMouseMove' cannot be declared 'Overrides' because it does not override a sub in a base class."

When I remove the keyword "Overrides" I get the error:
"sub 'OnMouseMove' shadows an overridable method in the base class 'UIElement'. To override the base method, this method must be declared 'Overrides'."

What's going on here? Why can't I override OnMouseMove? Is my IDE suffering from schizophrenia?

[chris128]

Instead of this:

Protected Overrides Sub OnMouseMove(ByVal e As MouseButtonEventArgs)

try this:

Protected Overrides Sub OnMouseMove(ByVal e As System.Windows.Input.MouseEventArgs)

[Hamish]

Nope... same error. I have imported the System.Windows.Input namespace, but even specifying the fully qualified type does not solve the problem.

[chris128]

You are using MouseEventArgs like I suggested and not MouseButtonEventArgs yeah?

Also, just to clarify, the class that this sub is in is inheriting from the Canvas control yes?

[Hamish]

Brilliant! I hadn't noticed the type difference there. The namespace thing was more obvious....
Yes, it is inheriting from Canvas, and I have no more errors in the code. Now on to build a test case.

[chris128]

thought you might of missed that :P Glad its sorted

[The Intern]

Brilliant! I hadn't noticed the type difference there. The namespace thing was more obvious....
Yes, it is inheriting from Canvas, and I have no more errors in the code. Now on to build a test case.

I am having the same error. so what did you do different in your code?

I know this is a very old thread but anyone that knows a solution to this please help. I will greatly appreciate it

Public Overrides Sub LoadDataSource()
Try

[Hamish]

Your overriding sub must have the exact same types of attributes as the sub you are overriding. In my example, I was overriding:

Sub OnMouseMove(e As MouseEventArgs)

with:

Sub OnMouseMove(e As MouseButtonEventArgs)

That does not work. So in your case I think the sub LoadDataSource you are overriding has arguments, while the overriding sub you show here does not.