Hiding main dialog
Jim Husband -- jimhus@airmail.net
Friday, August 09, 1996
Environment: VC++ 4.2, Windows 95
I am trying to get a dialog-based AppWizard generated program to initially
hide the main dialog (a task-bar icon is added, and the dialog can be made
visible thru clicking the taskbar). Using the approach below, I get a
"flicker" of the dialog at program startup. From that point on, everything
works fine. I would like to eliminate the initial "flicker." The dialog
serves as the message loop for processing the NotifyIcon messages - so I do
want the dialog created at program startup, just not displayed. Any
suggestions? (BTW, I have also turned off the "visible" checkbox within the
resource editor - to no avail.)
Thanks in advance.
Jim Husband
jimhus@airmail.net
~~~~~~~~~ Snippit Starts ~~~~~~~~~~
void CCleanIEDlg::OnPaint()
{
if (m_IsDlgVisible)
ShowWindow(SW_NORMAL);
else
ShowWindow(SW_HIDE);
CDialog::OnPaint();
}
Note: m_IsDlgVisible is initialized to FALSE in the contructor.
~~~~~~~~~ Snippit Ends ~~~~~~~~~~
petter.hesselberg -- petter.hesselberg@ac.com
Monday, August 12, 1996
[Mini-digest: 3 responses]
You may solve your problem by NOT calling CDialog::OnPaint
in the "hidden" case. Architecturally speaking, however, calling
ShowWindow from within a Paint handler does not strike me as
a terribly good idea. Other possibilities include placing the dlg
off-screen (disabled). If I were you, I'd trace through all the MFC
code related to dlg-box startup; this is sure to be illuminating.
Regards,
Petter
-----From: Brian_Dormer@ftdetrck-ccmail.army.mil
What about using SetRedraw(); to disable/enable display updating for
the dialog?
______________________________ Reply Separator _________________________________
Subject: Hiding main dialog
Author: mfc-l@netcom.com at Internet-Mail
Date: 8/12/96 4:15 AM
Environment: VC++ 4.2, Windows 95
I am trying to get a dialog-based AppWizard generated program to initially
hide the main dialog (a task-bar icon is added, and the dialog can be made
visible thru clicking the taskbar). Using the approach below, I get a
"flicker" of the dialog at program startup. From that point on, everything
works fine. I would like to eliminate the initial "flicker." The dialog
serves as the message loop for processing the NotifyIcon messages - so I do
want the dialog created at program startup, just not displayed. Any
suggestions? (BTW, I have also turned off the "visible" checkbox within the
resource editor - to no avail.)
Thanks in advance.
Jim Husband
jimhus@airmail.net
~~~~~~~~ Snippit Starts ~~~~~~~~~~
void CCleanIEDlg::OnPaint()
{
if (m_IsDlgVisible)
ShowWindow(SW_NORMAL);
else
ShowWindow(SW_HIDE);
CDialog::OnPaint();
}
Note: m_IsDlgVisible is initialized to FALSE in the contructor.
~~~~~~~~ Snippit Ends ~~~~~~~~~~
-----From: PP mail system
Hi Jim!
Try substituting "return" for "ShowWindow(SW HIDE)".
Regards,
Jim LW
Portalski Nick -- N.Portalski@datasci.co.uk
Wednesday, August 14, 1996
[Mini-digest: 4 responses]
Try putting the following in OnCreate(------)
{
// Usual OnCreate stuff
....
int screen_width = ::GetSystemMetrics(SM_CXSCREEN);
CRect my_rect;
GetWindowRec(&my_rect);
SetWindowPos(&wndTop,
screen_width + my_rect.Width() + 10,
0,
0,
0,
SWP_NOSIZE);
return 0;
}
This will create the dialog off screen, so you won't get that initial
flicker
when it's created. When you need it simply move it back on screen.
(If you don't want to leave it off screen then simpy hide it after it's been
created)
--
Nick
>Environment: VC++ 4.2, Windows 95
> I am trying to get a dialog-based AppWizard generated program to initially
>hide the main dialog (a task-bar icon is added, and the dialog can be made
>visible thru clicking the taskbar). Using the approach below, I get a
>"flicker" of the dialog at program startup. From that point on, everything
>works fine. I would like to eliminate the initial "flicker."
-----From: Jim Husband
[Moderator's note: This is a summary of answers to the question, including
what Jim ended up doing.]
Environment: VC++ 4.2, Windows 95
Although I'm not absolutely satisfied - I have a functioning
work-around. Before I forget everything - thought I would summarize the
various responses (and thank everyone for the help). Almost every suggestion
made good sense on why it should resolve the flicker - but only one did.
Hopefully this synopsis is worth something.
Initial message:
I am trying to get a dialog-based AppWizard generated program to initially
hide the main dialog (a task-bar icon is added, and the dialog can be made
visible thru clicking the taskbar). Using the approach below, I get a
"flicker" of the dialog at program startup.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Response: Why do you do it in OnPaint(), may be try the same in OnInitDialog()?
Regards.
Arie Goberman
Jerusalem
Outcome: No difference whether it was done in OnPaint or InitDialog -
flicker remains.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Response: Did you set the dialog to be not visible in the resource editor?
David Elliott -- dce@netcom.com - Moderator MFC-L
Outcome: I hadn't - but this also did not remove the flicker.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Response: Try substituting "return" for "ShowWindow(SW HIDE)".
Regards,
Jim LW
Outcome: Nice try - no affect (flicker remains).
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Response: You may solve your problem by NOT calling CDialog::OnPaint
in the "hidden" case. Architecturally speaking, however, calling
ShowWindow from within a Paint handler does not strike me as
a terribly good idea. Other possibilities include placing the dlg
off-screen (disabled). If I were you, I'd trace through all the MFC
code related to dlg-box startup; this is sure to be illuminating.
Regards,
Petter
Outcome: Several good points - however NOT calling OnPaint() did not get rid
of the flicker (I still don't know why it flickers - but it *really*
shouldn't if OnPaint() isn't being called... right?) Tracing thru MFC (or
any Windows code) is somewhat difficult (useless?) when trying to determine
why / when a paint is happening (since the debug environment forces
additional repaints on each "step" thru the code. Placing the dialog off
screen in OnInitDialog() is what I finally ended up using - but this just
feels sloppy (although it looks great).
It may well end up being a style setting (3D look, or Centered, ...)
somehow forces an initial paint of the dialog. I may go back and try to
resolve it - but it's dead for awhile.
Thanks again for the help.
Jim Husband
-----From: "Dmitry Davidovich"
Doesn't a simpler way to open main dialog minimized ?
-----
+++++++++++++++++++++++++++++++++++++++++
Dmitry Davidovich
CS Tel Aviv University
dmitry@enigma.co.il
ddmitry@libra.math.tau.ac.il
+++++++++++++++++++++++++++++++++++++++++
-----From: pjn@indigo.ie (pjn)
I to had the exact problem. I could not resolve it after having spent
2 days playing with it. The solution I finally arrived at was the use
a standard CMainFrame derived class as the main application window,
using m_nCmdShow = SW_HIDE and let it respond to the NotifyIcon
messages.
'''
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