Dynamic CStatusBar message text
peter.hodgman@autodesk.com
Sunday, March 16, 1997
Environment : VC++ 4.2 flat, NT 4.0
I would like to allow various parts of my application to set the text
for pane 0 of the status bar. For example, when a particular command
for specific view of a particular document (in MDI) is running it
wants to place dynamically various strings in the pane. When the user
switches to another view on a different document I want the pane to
reflect whatever is the current context of that document (maybe a
different command). The problem being is that there needs to be some
cooperation here so that as one client places text in the pane that
another clients text does not get destroyed and as the user switches
between different views on a document the pane 0 text is correct.
Additionally, I want to preserve the behavior of the tooltip /
toolhelp that the default toolbar provides. For example, when the user
is over a tool that text appears in pane 0 and when the cursor comes
back to the view it returns to the appropriate text for the context of
the active view and document. What would be the best way to achive
this?
Thanks in advance,
Pete Hodgman
Jeff S. Shanholtz -- jeffshan@flash.net
Tuesday, March 18, 1997
[Mini-digest: 5 responses]
> I would like to allow various parts of my application to set the
text
> for pane 0 of the status bar.
You can override the CFrameWnd::OnSetMessageString as follows:
LRESULT CMainFrame::OnSetMessageString(WPARAM wParam, LPARAM lParam)
{
if(AFX_IDS_IDLEMESSAGE == wParam)
{
lParam = (LONG)(const char*)m_wndStatusBar.GetIdleText(); //
custom method
wParam = 0;
}
return CMDIFrameWnd::OnSetMessageString(wParam, lParam);
}
> For example, when a particular command
> for specific view of a particular document (in MDI) is running it
> wants to place dynamically various strings in the pane. When the
user
> switches to another view on a different document I want the pane to
> reflect whatever is the current context of that document (maybe a
> different command).
I overrode CStatusBar and added the method GetIdleText. You could call
GetActiveView and a method like GetIdleText within the view in order to
make it view specific.
> The problem being is that there needs to be some
> cooperation here so that as one client places text in the pane that
> another clients text does not get destroyed and as the user switches
> between different views on a document the pane 0 text is correct.
The method I described should handle this problem; OnSetMessageString is
called thru OnIdle, so if you get the string from the active view, the pane
should always display the right string.
> Additionally, I want to preserve the behavior of the tooltip /
> toolhelp that the default toolbar provides. For example, when the
user
> is over a tool that text appears in pane 0 and when the cursor comes
> back to the view it returns to the appropriate text for the context
of
> the active view and document.
Because of the "if(AFX_IDS_IDLEMESSAGE == wParam)" check, toolbars and
menus will still be able to set the pane text.
Good luck!
Jeff Shanholtz
Enertech Consultants
-----From: Mario Contestabile
>The problem being is that there needs to be some
> cooperation here so that as one client places text in the pane that
> another clients text does not get destroyed and as the user switches
> between different views on a document the pane 0 text is correct.
Well I'm not sure I understand this. If you're setting the text for pane 0,
you obviously don't want the previous text that was there. If you're
into displaying various information, use 2 panes of text.
> Additionally, I want to preserve the behavior of the tooltip /
> toolhelp that the default toolbar provides. For example, when the user
> is over a tool that text appears in pane 0 and when the cursor comes
> back to the view it returns to the appropriate text for the context of
> the active view and document. What would be the best way to achive
> this?
Perhaps you're looking for something like:
pStat = (CStatusBar*)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
yourview::OnActivateView(){
if(bActive)
pStat->SetPaneText(...)
}
Then when the cursor is over a toolbar icon, the pane text will change
(presuming you added
one). If you still want something else use the resource string
AFX_IDS_IDLEMESSAGE.
Mario
mcontest@universal.com
-----From: "John Moulder"
> The problem being is that there needs to be some
> cooperation here so that as one client places text in the pane that
> another clients text does not get destroyed and as the user switches
> between different views on a document the pane 0 text is correct.
I think that you are getting a little confused between objects setting the
status bar text when they need to show something on the status bar, and the
status bar object asking for some text when it needs to display the text.
Anyway, here is a method to set the text on the status bar:
Firstly, see the Visual C++ Books Online help article entitled "FAQ:
Updating the Text of a Status-Bar Pane". This explains how to use the
CCmdUi mechanism to update the status bar.
Secondly, (this is the subtle trick), take advantage of MFC's
command/message routing, and implement the CCmdUi OnUpdateXXX handler in
each of your view classes or MDI document classes, rather than handling the
OnUpdateXXX in the mainframe window class.
Your view or document class will then update the status bar, and tooltips,
menu tracking text etc. will still appear on the status bar as well.
----------
> From: peter.hodgman@autodesk.com
> To: mfc-l@netcom.com
> Subject: Dynamic CStatusBar message text
> Date: 16 March 1997 10:57
>
> Environment : VC++ 4.2 flat, NT 4.0
>
> I would like to allow various parts of my application to set the
text
> for pane 0 of the status bar. For example, when a particular command
> for specific view of a particular document (in MDI) is running it
> wants to place dynamically various strings in the pane. When the
user
> switches to another view on a different document I want the pane to
> reflect whatever is the current context of that document (maybe a
> different command). The problem being is that there needs to be some
> cooperation here so that as one client places text in the pane that
> another clients text does not get destroyed and as the user switches
> between different views on a document the pane 0 text is correct.
> Additionally, I want to preserve the behavior of the tooltip /
> toolhelp that the default toolbar provides. For example, when the
user
> is over a tool that text appears in pane 0 and when the cursor comes
> back to the view it returns to the appropriate text for the context
of
> the active view and document. What would be the best way to achive
> this?
>
> Thanks in advance,
>
> Pete Hodgman
>
-----From: "petter.hesselberg"
For various reasons I don't have access to my development environment right
now, so this is pretty much off the top of my head. I did find some relevant
source code; this is from an MDI app which appears to do pretty much what you
want. It overrides a function called OnSetMessageString in the main frame; I
seem to recall that this function is not documented, but I'm not staking my rep
on that. The GetCurrentPrompt() is up to you -- get it from the active view,
perhaps.
Final advice: Trace through CMDIFrameWnd::OnSetMessageString and chec out what
it does. Here's the code:
afx_msg LRESULT MainFrame::OnSetMessageString( WPARAM wParam, LPARAM lParam )
{
// Override this to control default message string on status bar.
// MFC handles menu prompt and tooltips.
const LRESULT lResult = CMDIFrameWnd::OnSetMessageString( wParam, lParam );
if ( AFX_IDS_IDLEMESSAGE == wParam ) {
CWnd *pMessageBar = GetMessageBar();
if ( pMessageBar ) {
CString strMsg;
if ( MDIGetActive() ) {
//TODO: Try overriding GetMessageString instead of
//this function. Equivalent to LoadString, pretty much.
GetMessageString( GetCurrentPrompt(), strMsg );
} else {
strMsg.LoadString( IDS_NO_VIEW_PROMPT );
}
pMessageBar->SetWindowText( strMsg );
}
}
return lResult;
}
Regards,
Petter Hesselberg
_____________________________
To: mfc-l @ netcom.com @ internet
cc: (bcc: Petter Hesselberg)
From: peter.hodgman @ autodesk.com @ internet
Date: 16-03-97 08:57
Subject: Dynamic CStatusBar message text
_____________________________
Environment : VC++ 4.2 flat, NT 4.0
I would like to allow various parts of my application to set the text
for pane 0 of the status bar. For example, when a particular command
for specific view of a particular document (in MDI) is running it
wants to place dynamically various strings in the pane. When the user
switches to another view on a different document I want the pane to
reflect whatever is the current context of that document (maybe a
different command). The problem being is that there needs to be some
cooperation here so that as one client places text in the pane that
another clients text does not get destroyed and as the user switches
between different views on a document the pane 0 text is correct.
Additionally, I want to preserve the behavior of the tooltip /
toolhelp that the default toolbar provides. For example, when the user
is over a tool that text appears in pane 0 and when the cursor comes
back to the view it returns to the appropriate text for the context of
the active view and document. What would be the best way to achive
this?
Thanks in advance,
Pete Hodgman
-----From: "petter.hesselberg"
Here's an update on my previus reply to this posting. It turns out that there's
a message map entry for the OnSetMessageString, as follows:
BEGIN_MESSAGE_MAP(MainFrame, CMDIFrameWnd)
...
ON_MESSAGE( WM_SETMESSAGESTRING, OnSetMessageString )
...
//{{AFX_MSG_MAP(MainFrame)
ON_WM_CREATE()
...
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
This entry is NOT maintained by ClassWizard.
Hope this helps.
Regards,
Petter
_____________________________
To: mfc-l @ netcom.com @ internet
cc: (bcc: Petter Hesselberg)
From: peter.hodgman @ autodesk.com @ internet
Date: 16-03-97 08:57
Subject: Dynamic CStatusBar message text
_____________________________
Environment : VC++ 4.2 flat, NT 4.0
I would like to allow various parts of my application to set the text
for pane 0 of the status bar. For example, when a particular command
for specific view of a particular document (in MDI) is running it
wants to place dynamically various strings in the pane. When the user
switches to another view on a different document I want the pane to
reflect whatever is the current context of that document (maybe a
different command). The problem being is that there needs to be some
cooperation here so that as one client places text in the pane that
another clients text does not get destroyed and as the user switches
between different views on a document the pane 0 text is correct.
Additionally, I want to preserve the behavior of the tooltip /
toolhelp that the default toolbar provides. For example, when the user
is over a tool that text appears in pane 0 and when the cursor comes
back to the view it returns to the appropriate text for the context of
the active view and document. What would be the best way to achive
this?
Thanks in advance,
Pete Hodgman
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