Again Re & Q : How can I size client precisely ?
Taehoon Kee -- keeth@chollian.dacom.co.kr
Thursday, September 26, 1996
Environment : VC++ 4.0, Windows 95
In question "How can I size client precisely ?", I wrote :
>Environment : VC++ 4.0, Windows 95
>
>To size a view at wanted size,
>In my view class's OnInitialUpdate,
>
> rect.left = 100;
> rect.top = 100;
> rect.right = 200;
> rect.bottom = 200;
>
> AdjustWindowRect( &rect, AfxGetMainWnd()->GetStyle(), TRUE);
> AfxGetMainWnd()->MoveWindow( rect, TRUE);
>
>And then,
>In OnDraw,
> I call GetClientRect,
>
>The result I wanted was ( 0, 0, 100, 100),
>BUT the result was -> ( 0, 0, 96, 96) !
>I guess difference 4 is border's thickness,
> but I started this app by turning off "Thick Frame".
>
>What is wrong ?
>
>To size a view at wanted size,
>I try CalcWindowRect and AdjustWindowRect.
>But Both were wrong.
>
>And in case of adopting ToolBar and/or StatusBar,
> problems get worse.
>
>How can I do it ?
>
>Thanks in advance.
>Taehoon
========================================================================
AND there were three replys.
I thank them for replys.
* Re 1. by Roy G. Browning
>You sized your rectangle in "logical pixels" and what you got back was in
>"device pixels". Check out the "LPtoDP()" and "DPtoLP()" functions.
To be honest, I cannot figure out what this means.
IMHO, all CalWindowRect, AdjustWindowRect, GetClientRect runs on
MM_TEXT.
* Re 2. by Grigoriev Alexander
>In some source file I have seen the following code:
>
> // The windows API AdjustWindowRect (and thus Cwnd::CalcWindowRect) gets its
> // sums wrong when you have a WS_OVERLAPPED style. The following line gets
> // around this.
> AdjustWindowRect( &rectClient, WS_CAPTION|WS_THICKFRAME, TRUE );
>
>Note about WS_OVERLAPPED. Your window has such a style.
This helped me. But there are deeper problems, I think.
*Re 3. by ganeshs@nationwide.com
>Put the CalcWindowRect call in your frame window's OnCreate,
>then call MoveWindow, and things should be fine.
>What's happening is, since the View does not have a "frame",
>CalcWindowRect returns the rect unchanged.
>So, effectively, you're using the same initial values to size
>the Frame, not taking the Frame's "frame" into account.
>
>For correct View sizing with ToolBars/StatusBars, use RepositionBars
>with the reposQuery option (again) in your Frame window's OnCreate,
>passing the View's desired size. Then call MoveWindow with the Rect
>returned, and RepositionBars again.
>Check out ftp://ftp.microsoft.com/softlib/mslfiles/DLGCBR32.EXE.
>This program explains the procedure for a Dialog,
>but the same principle applies.
This reply has 2 part.
Part one is about location of calling CalcWindowRect,
but, IMHO, this did not help me.
Whether I call the func at View or at MainFrame,
no differences are made.
Part Two is about adopting ToolBar and/or StatusBar,
I will thank him for that comment, though, I did not test yet.
========================================================================
None of three above gives me a cool answer.
So, I explored through MFC's source codes.
And then I found some strange looking codes.
In viewcore.cpp, CalcWindowRect,
if (nAdjustType != 0)
{
// allow for special client-edge style
::AdjustWindowRectEx(lpClientRect, 0, FALSE, GetExStyle()); //
(*)
// default behavior for in-place editing handles scrollbars
DWORD dwStyle = GetStyle();
if (dwStyle & WS_VSCROLL)
{
... below, omit.
In the above code line which I mark with (*),
CalcWindowRect calls AdjustWindowRectEx.
BUT, the parameters are somewhat curious.
2nd param dwStyle is set to zero,
this style must be MainFrame's window style !
and 3rd param is set to be FALSE,
this parameter should designate whether this MainFrame has menu or not.
And after some tests,
I concluded that this problem was resulted from that lines.
So, instead of building whole MFC DLL variants,
I solved this by inserting followings into view's OnInitialUpdate,
DWORD style = AfxGetMainWnd()->GetStyle();
// style = GetStyle(); -> wrong
DWORD exstyle = GetExStyle();
// exstyle = AfxGetMainWnd()->GetExStyle(); -> wrong
AdjustWindowRectEx( &rectDC, style, TRUE, exstyle);
AfxGetMainWnd()->MoveWindow( &rectDC, TRUE);
//GetClientRect( &rectDC); // for test right or wrong...
*********************************************************************
If you are using VC++ 4.2,
LET ME KNOW about 4.2's viewcore.cpp - CalcWindowRect.
Some changes ?
*********************************************************************
But, when adopting toolbar and status bar,
it still needs to be studied...
Thanks all.
Taehoon
Shanku Niyogi -- shanku@accent.net
Saturday, September 28, 1996
> From: Taehoon Kee
> To: mfc-l@netcom.com
> Subject: Again Re & Q : How can I size client precisely ?
> Date: Wednesday, September 25, 1996 7:44 PM
>
> ...
> Part one is about location of calling CalcWindowRect,
> but, IMHO, this did not help me.
> Whether I call the func at View or at MainFrame,
> no differences are made.
>
If you do put the code in OnCreate, and you are having all
sorts of problems with CalcWindowRect, why not just call
GetWindowRect and GetClientRect, and add the difference?
CRect rectClient, rectWindow;
GetClientRect (&rectClient);
GetWindowRect (&rectWindow);
rect.left = 100;
rect.top = 100;
rect.right = 200 + rectWindow.Width () - rectClient.Width ();
rect.bottom = 200 + rectWindow.Height () - rectClient.Height ();
It would save a lot of time murking around with CalcWindowRect,
IMHO.
Regards,
Shanku.
=======================================================================
Shanku S. Niyogi
shanku@accent.net
Etobicoke, Ontario, Canada
John Simmons -- jms@connectnet.com
Monday, September 30, 1996
[Mini-digest: 2 responses]
At 01:52 PM 9/28/96 -0400, you wrote:
>> From: Taehoon Kee
>> To: mfc-l@netcom.com
>> Subject: Again Re & Q : How can I size client precisely ?
>> Date: Wednesday, September 25, 1996 7:44 PM
>>
>> ...
>> Part one is about location of calling CalcWindowRect,
>> but, IMHO, this did not help me.
>> Whether I call the func at View or at MainFrame,
>> no differences are made.
>>
>
>If you do put the code in OnCreate, and you are having all
>sorts of problems with CalcWindowRect, why not just call
>GetWindowRect and GetClientRect, and add the difference?
>
> CRect rectClient, rectWindow;
>
> GetClientRect (&rectClient);
> GetWindowRect (&rectWindow);
> rect.left = 100;
> rect.top = 100;
> rect.right = 200 + rectWindow.Width () - rectClient.Width ();
> rect.bottom = 200 + rectWindow.Height () - rectClient.Height ();
>
>It would save a lot of time murking around with CalcWindowRect,
>IMHO.
>
The only way I was able to resize an MDI client window was in my derive
child frame class. One note of caution - there's a bug in MFC which does
not show the minimize or close system buttons normally associated with a
window if you maximize it within the OnCreate() method. The fastest fix I
found for this was to set a public flag that indicated whether or not the
window should come up maximized, and create a function in the child frame
class which acted on it when called from the OnInitialUpdate() method in the
view class using the frame. I've included code from my frame class and the
view class to illustrate. It should be fairly simple to make adjustments to
fit your situation.
Here's the code for the child frame :
//---------------------------------------------------------------------/
int CMyMdiFrame::CMDIvp()
{
initially_maximized = FALSE;
}
//---------------------------------------------------------------------/
int CMyMdiFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
if (CMDIChildWnd::OnCreate(lpCreateStruct) == -1)
return -1;
//resize this window
// get the size of the entire window
RECT rc;
GetWindowRect(&rc);
//set the top/left corner
// NextWindowPos is a variable I created to track window positions as
// new ones are created.
rc.left = NextWindowPos.left;
rc.top = NextWindowPos.top;
// set the bottom right corner
rc.right = rc.left + 650;
rc.bottom = rc.top + 490;
int cx = GetSystemMetrics(SM_CXSCREEN);
if (cx <= 640)
initially_maximized = TRUE;
else
{
WINDOWPLACEMENT wnd;
wnd.length = sizeof(WINDOWPLACEMENT);
if (AfxGetMainWnd()->GetWindowPlacement(&wnd))
{
int xsize = wnd.rcNormalPosition.right - wnd.rcNormalPosition.left;
int ysize = wnd.rcNormalPosition.bottom - wnd.rcNormalPosition.top;
if (xsize <= 680 || ysize <= 520)
initially_maximized = TRUE;
else
MoveWindow(&rc);
}
else
MoveWindow(&rc);
}
RecalcLayout();
return 0;
}
//-----------------------------------------------------------------------/
void CMyMdiFrame::SetScenarioID(int id)
{
ScenarioID = id;
}
//-----------------------------------------------------------------------/
void CMyMdiFrame::MaximizeIfNeeded()
{
if (initially_maximized)
{
ShowWindow(SW_SHOWMAXIMIZED);
}
initially_maximized = FALSE;
}
Here's the affected method in the view class :
//----------------------------------------------------------------/
void CMyView::OnInitialUpdate()
{
CView::OnInitialUpdate();
CMDIvp* pFrame = (CMDIvp *)GetParentFrame();
pFrame->MaximizeIfNeeded();
}
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-----From: Chris Saunders
I did not see your original posting so I am trying to guess what you are
after from the subject heading. If you know precisly the size that you
want for your client rectangle then you can calculate the size of the
entire window using the function AdjustWindowRect or AdjustWindowRectEx.
You would call one of these in your OnCreate handler and then use the
returned RECT to size your window.
Regards
Chris Saunders
saunders@wchat.on.ca
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