Overriding OnPaint in Inherited control..

[BenFinkel]

Hey ya'll

I'm trying to mess around with the ListView control, and first I'm overriding the OnPaint method like so:

    Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)

        Dim g As Graphics = e.Graphics
        Dim pn As Pen = New Pen(Color.Green, 10)
        g.DrawLine(pn, 100, 10, 30, 10)
        g.DrawEllipse(New Pen(Color.Red, 20), 20, 40, 20, 20)
    End Sub

But nothing seems to change when I use my version of the control on my form? What gives? Shouldn't I see a red circle and a green line in my control?

Thanks!
-Ben

[BenFinkel]

Ok,
So I set the UserPaint style to true.. does this mean I have to re-draw the entire control myself?

Thanks again,

Ben

[nemaroller]

First, drop the user-drawn idea for now.

List controls are touchy. They are usually are a combination of other low-level controls. In some cases, the low-level control will draw after your custom paint event. I haven't played with listview, but have messed around with listbox.

Private Sub SoftListBox_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        'draw a soft border around the listbox
        e.Graphics.DrawRectangle(New Pen(SystemColors.ControlDarkDark), _
         New Rectangle(ListBox1.Location.X - 1, ListBox1.Location.Y - 1, ListBox1.Width + 2, ListBox1.Height + 2))
    End Sub

My advice to you is try to use the _Paint event first. If that doesn't work use this:

Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
 
[b]Mybase.OnPaint(e)[/b]
 
        Dim g As Graphics = e.Graphics
        Dim pn As Pen = New Pen(Color.Green, 10)
        g.DrawLine(pn, 100, 10, 30, 10)
        g.DrawEllipse(New Pen(Color.Red, 20), 20, 40, 20, 20)
    End Sub

[BenFinkel]

Yea, I've tried MyBase.OnPaint, got me nowhere.

I read somewhere that I've got to re-draw the entire control myself, so, it's the weekend and I figure what the hell, why not.

Thanks for the advice,

Ben

[nemaroller]

When you say inherited control, you mean just declaring a new class and adding Inherits ListView correct?

Just making sure you are not clicking Add Inherited Control from the designer.

[BenFinkel]

Yea, I've created a new class and typed 'Inherits ....' in the class definition.

I'll admit I'm having some trouble getting it to paint properly. I'm not sure if it's my fault or something internal to the control that I'm unaware of, but getting my vertical columns to always line up is gettin' a bit tricky.

Ah well, I haven't given up yet. I'll keep you's guys informed on my progress.

Thanks for the help!

-Ben

[BenFinkel]

On a different note,

How do I draw text to my control? I figured that GDI would have a way to do it but I don't see anything...

Thanks!

Ben

[MrPolite]

Originally posted by BenFinkel
On a different note,

How do I draw text to my control? I figured that GDI would have a way to do it but I don't see anything...

Thanks!

Ben

Grahpics.DrawString