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Screen redraaw problem

Posted on 2009-04-11
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Last Modified: 2013-11-27
When I select a menu item to kick off a CPU intensive process, the process runs showing the progress dialog.

However, the menu remains displayed until the process has completed. (You can see what I mean in the attached image.)

How do I ensure that the menu disappears before the process kicks off?
ScreenError.jpg
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Question by:jindalee
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7 Comments
 
LVL 64

Expert Comment

by:Fernando Soto
ID: 24124413
Can you post the menu click event that kicks off the CPU intensive process?
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LVL 1

Author Comment

by:jindalee
ID: 24124424
Here it is (in full):
   Private Sub ProgramsToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ProgramsToolStripMenuItem.Click
        DataGridView1.Rows.Clear()
        fontCount = 0
        dlgLoadProgress.Text = My.Resources.searchExecutableFile.ToString()
        fileType = "*.exe"
        dlgLoadProgress.Show()
        GetFiles(fileType)
        dlgLoadProgress.Close()
    End Sub

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LVL 64

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 24124447
Try adding this line, Application.DoEvents(), to the code as shown in the code snippet.
   Private Sub ProgramsToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ProgramsToolStripMenuItem.Click
        DataGridView1.Rows.Clear()
        fontCount = 0
        dlgLoadProgress.Text = My.Resources.searchExecutableFile.ToString()
        fileType = "*.exe"
        Application.DoEvents()   ' Add this line here
        dlgLoadProgress.Show()
        GetFiles(fileType)
        dlgLoadProgress.Close()
    End Sub

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Author Closing Comment

by:jindalee
ID: 31569260
That did the trick.  Any chance you could explain why?
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LVL 64

Expert Comment

by:Fernando Soto
ID: 24125566
What was happening is that the Window events that display and redraw the visuals on the screen were in the Windows Message Loop ready to be processed when the menu click event was called. This transfers control to the menu click event and does not return to process the remaing events until the menu click event has completed. By issueing a Application.DoEvents() this tells the OS to complete the processing of the events in the Windows Message Loop and return to the menu click event when that is done.
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LVL 1

Author Comment

by:jindalee
ID: 24128355
Thank you. It is much better to understand what is happening than to just accept that it does the trick
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LVL 64

Expert Comment

by:Fernando Soto
ID: 24132075
Not a problem, I understand, glad I was able to help.  ;=)
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