[Mono-bugs] [Bug 341314] System.ArgumentException: Cannot activate invisible or disabled control

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=341314#c3


Ian Walker <walker_643 at yahoo.com> changed:

           What    |Removed                                         |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                                        |NEW
      Info Provider|walker_643 at yahoo.com                            |




--- Comment #3 from Ian Walker <walker_643 at yahoo.com>  2007-11-14 07:02:37 MST ---
Test on 1.2.6 preview package failed; same dump as before:

Unhandled Exception: System.ArgumentException: Cannot activate invisible or
disabled control.
  at System.Windows.Forms.ContainerControl.set_ActiveControl
(System.Windows.Forms.Control value) [0x00221] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/ContainerControl.cs:178 
  at System.Windows.Forms.Control.Select (System.Windows.Forms.Control control)
[0x00021] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Control.cs:1317 
  at System.Windows.Forms.Form.SelectActiveControl () [0x00054] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Form.cs:259 
  at System.Windows.Forms.Form.WmActivate (System.Windows.Forms.Message& m)
[0x0001d] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Form.cs:2586 
  at System.Windows.Forms.Form.WndProc (System.Windows.Forms.Message& m)
[0x00100] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Form.cs:2408 
  at System.Windows.Forms.Control+ControlWindowTarget.OnMessage
(System.Windows.Forms.Message& m) [0x00000] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Control.cs:225 
  at System.Windows.Forms.Control+ControlNativeWindow.WndProc
(System.Windows.Forms.Message& m) [0x00000] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Control.cs:206 
  at System.Windows.Forms.NativeWindow.WndProc (IntPtr hWnd, Msg msg, IntPtr
wParam, IntPtr lParam) [0x0006a] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/NativeWindow.cs:188 
  at System.Windows.Forms.XplatUIX11.SendMessage (IntPtr hwnd, Msg message,
IntPtr wParam, IntPtr lParam) [0x0008d] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/XplatUIX11.cs:4883 
  at System.Windows.Forms.XplatUIX11.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr handle, Int32 wFilterMin, Int32
wFilterMax) [0x01193] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/XplatUIX11.cs:4051 
  at System.Windows.Forms.XplatUI.GetMessage (System.Object queue_id,
System.Windows.Forms.MSG& msg, IntPtr hWnd, Int32 wFilterMin, Int32 wFilterMax)
[0x00000] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/XplatUI.cs:671 
  at System.Windows.Forms.Application.RunLoop (Boolean Modal,
System.Windows.Forms.ApplicationContext context) [0x00392] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Application.cs:854 
  at System.Windows.Forms.Application.Run
(System.Windows.Forms.ApplicationContext context) [0x00014] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Application.cs:630 
  at System.Windows.Forms.Application.Run (System.Windows.Forms.Form mainForm)
[0x00000] in
/usr/local/src/mono-1.2.6-preview/mono-1.2.6/mcs/class/Managed.Windows.Forms/System.Windows.Forms/Application.cs:618 
  at MyCo.MyProject.Program.Main () [0x00026] in
/source/myco/myproject/Program.cs:23


Incidentally, I have a workaround for this problem. It seems to be triggered
when the child form is dismissed and focus returns to the main form. The
control that was last active on the main form just happens to have had its
Visible property set to false (hence the "active" control is invisible) and MWF
complains instead of picking another control. My workaround was to add
  this.someButton.Focus();  // where 'this' == main form
before the child form is dismissed.

Unfortunately, I have not been able to reproduce this in a small test case or I
would post one. Maybe it's not as simple as returning to a form where the last
active control is now hidden? I'm still working on it :)


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