Control Flickering

[himanshubari]

Hey,

 

can somebody help me out to avoid the flickering of controls that I am getting while I mobve them on the forma t runtime.

here is the code I have added to the mouse events for a button I hav on my form

Private Sub Button1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Button1.MouseDown

If e.Button = MouseButtons.Left Then

moving = True

End If

End Sub

 

Private Sub Button1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Button1.MouseMove

If moving Then

Button1.Location = New Point(e.X, e.Y)

Button1.Refresh()

Button1.Parent.Refresh()

 

End If

 

End Sub

 

Private Sub Button1_MouseUp(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Button1.MouseUp

moving = False

End Sub

 

I also added these lines after the initialize component call to enable double bufferring

Me.SetStyle(ControlStyles.DoubleBuffer, True)

Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)

Me.SetStyle(ControlStyles.UserPaint, True)

 

 

HELP WILL REALLY BE APPRECIATED

THANKS

[thenerd]

I'm not really sure, but I don't think you need the

Button1.Refresh()

Button1.Parent.Refresh()

lines.

 

If I'm wrong and you do need them. They're still most likely what's causing the flickering.

[Talyrond]

Hi, typically when moveing controls around at runtime, you would not animate the whole control, but rather draw a rectangle to represent the control and only on the mouse up redraw the control. Try it in the Visual Studio designer!

 

I did a sample for another forum, this moves a Listbox around at runtime with the mouse, project attached.

 

Hope this helps

ListBox.zip

Edited March 14, 2005 by PlausiblyDamp

[himanshubari]

Thanks!!!

 

Hey !!...I ran the code that demonstrated moving the listbox at run time.

Thanks a lot, I think this techniquewill serve my purpose. Actually I am working on a simple UI configurator that will instantialte the control at runtime and allow it to be moved around on the form. The rectangle technique of yours will work great I guess

Thanks Again!

[sndickens]

I know that I'm resurrecting an old thread here, but I'm looking for answers and hope I can get some. Keep in mind that I'm self-taught and only started about 2 months ago...so if something is blatant that I'm missing feel free to make me feel like an idiot.

 

I downloaded the project above and it worked great for my needs (thanks!). However I am adding buttons to a panel that can then be dragged and dropped. I'm trying to get the painting of the rectangle on the panel instead of the form. Also the rectangle location has to be based on the panel.

 

Here is the code for the painting of the rectangle:

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint

       If m_selected Then
           ControlPaint.DrawFocusRectangle(e.Graphics, m_selectionRect)
       End If

End Sub

 

Any help would be appreciated.