flickering toolbars

[Christian Lützenkirchen]

Hi,

I am using Version 4.4.0.54. Starting with Version 4 the toolbars in a application are drawn very often in a bigger application and the window seems to flicker. You can see this effect in your VSDemo_2005. Please open 2-3 child windows and then close the application using the X in the upper right corner. While closing the application the toolbars are drawn about five times at different positions! You can see this effect especially on a slow computer.
This effect also appears when child windows are slow, e.g. load data from a database.

Is there a workaround for this "feature"?

Best Regards,
Christian

[Golda Rebecal]

Hi Christian,

To avoid flickering on closing the application, we can use the LockWindowUpdate interop call in the form closing event.

1) We have to import the required assemblies for the LockWindowUpdate interop call

[System.Runtime.InteropServices.DllImportAttribute("user32.dll")]
private static extern bool LockWindowUpdate(Int64 windowHandle);

2) Then we have to call LockWindowUpdate in the form closing event.

void VSMainForm_FormClosing(object sender, FormClosingEventArgs e)
{
LockWindowUpdate(this.Handle.ToInt64());
}

Please have a look at the modified VS_Demo2005 sample attached and let me know if this helps.


Regards,
Golda


VSDemo.zip

[Christian Lützenkirchen]

Hi Golda,

thank you for your reply but I can not open the zip file. Can you please check this?

Best Regards,
Christian

[Christian Lützenkirchen]

Hi Golda,

it is running fine now! But you have to define the windowsHandle as IntPtr!

Best Regards,
Christian