How do I set Visible = False when Form is Maximized?

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Hi guys,

i do have the problem, if i try to set the visibility of my Form to false.

if the form is in FormWindowState = Normal, everything is working as expected.
but if i try it in FormWindowState = Maximized, it will cause the problem, that programmatically my form is visible = false, but will be about half a second later.

does anyone knows this problem?
and more important, does anyone knows a solution? :D

Here my code to set the visibility:

C#

private void notifyIcon_DoubleClick(object Sender, EventArgs e)
{
   if (!allowshowdisplay)
   {
      this.Left = Screen.PrimaryScreen.WorkingArea.Width / 2 - Width / 2;
      this.Top = Screen.PrimaryScreen.WorkingArea.Height / 2 - Height / 2;
   }

   if (!this.Visible)
   {
      SplashScreen.ShowSplashScreen(new Rectangle { Size = this.Size, Location = this.Location }, @"\Resources\wait.jpg", false);

      Thread.Sleep(100);
   }

   this.allowshowdisplay = true;
   this.Visible = !this.Visible;

   if (this.Visible)
      SplashCloseThreaded();
   else
      SplashScreen.CloseForm();
}

Posted 17-Sep-14 23:52pm

Nooa

Updated 18-Sep-14 3:33am

Nelek

v3

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BillWoodruff 18-Sep-14 6:09am

Need more information: how many Forms are there; which/what is the Main Form. What does 'SplashCloseThreaded do ?

Nooa 18-Sep-14 6:17am

this is the MainForm.
At this moment is only one Form active (this MainForm)
SplashCloseThreaded closes the SplashScreen with an separate delay.
the SplashScreen is an own thread, but is in this moment not active.

BillWoodruff 18-Sep-14 6:40am

See if this makes any difference in performance:

if (this.Visible)
this.Hide();
SplashCloseThreaded();
else
this.Show();
SplashScreen.CloseForm();

You might want to show the code for 'SplashScreen CloseForm and ShowSplashScreen.

Nooa 18-Sep-14 7:44am

doesnt make any difference

3 solutions

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OriginalGriff · Answer 1 · 2014-09-18T00:50:00

Quick test (Add a button to an existing form, set Visible to false in the button) says there is no significant time difference between hiding a "normal" form and a maximized one.
So...the problem has to be in your subsequent methods, and pretty much has to be that they are taking the time - which means that the visibility request is not honoured visually until the method exits, and that's what I would expect. The single thread can't do two things at the same time.
Depending on what your methods are doing, it may be possible to move them to a background thread, or in extreme cases add a timer which "delays" calling the method until the form is actually hidden.

Dave Kreskowiak · Answer 2 · 2014-09-18T02:01:00

You code snippet is incomplete.

I have no idea what allowshowdisplay is for.

Why you're calling Thread.Sleep, which, BTW, will cause your UI to freeze and not update at all during that time.

What is the SplashCloseThreaded? Why "threaded"?

What is this??

Remember, your windows and controls will NOT update themselves on screen when the individual statements manipulating them are executed. The UI thread (startup thread) cannot respond to the incoming WS_PAINT events until your DoubleClick event handler is done executing.

Nooa · Answer 3 · 2014-09-18T03:24:00

Solution 3

i solved the problem.

issue was a "this.ShowInTaskbar = this.Visible" in "Form_VisibleChanged"

so since i commented this line, everything is working as expected.

Posted 18-Sep-14 3:24am

Nooa

How do I set Visible = False when Form is Maximized?

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