C / C++ / MFC

Selected Item's in custom draw CListCtrl

26-Oct-01 0:46

You shouldn't set the size of a bitmap selected into memory DC to the size of the screen - instead, use GetClipBox function which gives you the area that actually needs to be repainted (which is never greater than the size of the screen, at least with single-monitor system).

There was good article about that in June 1997 issue of MSJ - "Wicked Code" by Jeff Prosise. It should be in the 'Periodicals' section of your VC++ help; if it's not here, go to MSDN Online, then MSDN Magazine and search for past issues.

Tomasz Sowinski -- http://www.shooltz.com

stephan25-Oct-01 22:40

stephan

25-Oct-01 22:40

I create custom draw text in ClistCtrl. But i get problems because
the item's i selected were not highlighted. Do anybody know how i can do
this?

Please help!
Here is the code i wrote:
void CMyList::OnCustomdrawList ( NMHDR* pNMHDR, LRESULT* pResult )
{
NMLVCUSTOMDRAW* pLVCD = reinterpret_cast<nmlvcustomdraw*>( pNMHDR );

*pResult = 0;

CDC *pDC= CDC::FromHandle(pLVCD->nmcd.hdc);
CRect rect;

switch(pLVCD->nmcd.dwDrawStage)
{
case CDDS_PREPAINT:
*pResult = CDRF_NOTIFYITEMDRAW;
break;

case CDDS_ITEMPREPAINT:
int iRow = pLVCD->nmcd.dwItemSpec;
CString sItem = GetItemText(iRow, 0);
CString sNo = sItem.SpanIncluding("1234567890");
CString sLetter= sItem.Right(4);

GetItemRect(iRow, rect, LVIR_LABEL);

pDC->SetTextAlign ( TA_RIGHT | TA_TOP | TA_UPDATECP );
pDC->MoveTo ( rect.right , rect.top );

if ( sLetter.Find("B") != -1 )
{
pDC->SetTextColor ( RGB(255,0,0) );
pDC->TextOut ( 0, 0, sLetter );

}
else if ( sLetter.Find("E") != -1 )
{
pDC->SetTextColor ( RGB(0,0,255) );
pDC->TextOut ( 0, 0, sLetter );
}
else if ( sLetter.Find("V") != -1 )
{
pDC->SetTextColor ( RGB(0,170,0) );
pDC->TextOut ( 0, 0, sLetter );

}
else if ( sLetter.Find("U") != -1 )
{
pDC->SetTextColor ( RGB(255,0,255) );
pDC->TextOut ( 0, 0, sLetter );

}
else if ( sLetter.Find("AR") != -1 )
{
pDC->SetTextColor ( RGB(0,255,255) );
pDC->TextOut ( 0, 0, sLetter );

}
pDC->SetTextColor ( RGB(0,0,0) );
pDC->TextOut ( 0, 0, sNo );

*pResult= CDRF_SKIPDEFAULT;

break;
default:
*pResult = CDRF_DODEFAULT;
break;
}
}

Re: Selected Item's in custom draw CListCtrl

Tomasz Sowinski26-Oct-01 0:06

Re: Selected Item's in custom draw CListCtrl

26-Oct-01 0:06

You're returning CDRF_SKIPDEFAULT from CDDS_ITEMPREPAINT, and this means that list control doesn't draw items. You have to check the item state with GetItemState and draw the item in appropriate color/font if it's selected.

Tomasz Sowinski -- http://www.shooltz.com

stephan8-Nov-01 3:10

stephan

8-Nov-01 3:10

How can i do that
Have you an example?

How to change the caption of a dialog at run time ??

25-Oct-01 22:27

How to change the caption of a dialog at run time ??
Thanx

Re: How to change the caption of a dialog at run time ??

25-Oct-01 22:43

setWindowText("New title")

Re: How to change the caption of a dialog at run time ??

Christian Graus25-Oct-01 22:44

Christian Graus

25-Oct-01 22:44

Just call SetWindowText()

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Thanx

adara25-Oct-01 23:15

adara

25-Oct-01 23:15

Setting a window's font

James Bird25-Oct-01 21:44

James Bird

25-Oct-01 21:44

How do you set a window's font using Win32 (NOT MFC!!!)?
I have been trying to use the WM_SETFONT message but it doesn't seem to work...

Thanks,

James Bird - birdjames@bigfoot.com

Nish Nishant25-Oct-01 23:39

25-Oct-01 23:39

by window's font do you mean the font on the title bar? or do you mean the font of all the controls on that window? I am not sure you can use WM_SETFONT to change the font of the title bar unless you do some painting on your own...

for the individual controls you can use WM_SETFONT

Nish

Christian Graus25-Oct-01 23:42

Christian Graus

25-Oct-01 23:42

Could you post an example, I've been unable to get it to work.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

Nish Nishant26-Oct-01 0:01

26-Oct-01 0:01

I tried it out and it worked fine
medit is a global HWND

medit=CreateWindow("EDIT","",WS_VISIBLE|WS_CHILD|WS_BORDER,10,10,300,30,hWnd,NULL,
      hInstance,NULL);
  HFONT hfont;
  hfont=CreateFont(25,12,0,0,700,TRUE,0,0,DEFAULT_CHARSET,
      OUT_DEFAULT_PRECIS,CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH,
      "Times New Roman");
  SendMessage(medit,WM_SETFONT,(WPARAM)hfont,0);

Tomasz Sowinski26-Oct-01 0:03

26-Oct-01 0:03

Are you sure that lifetime of HFONT is long enough? You can't just pass a HFONT to a Window with WM_SETFONT and destroy the font - the window doesn't copy the font.

The second thing is that not all Windows support this message. Standard controls do, but your own Window classes do not unless you explicitly handle this message.

Tomasz Sowinski -- http://www.shooltz.com

Nish Nishant26-Oct-01 0:09

26-Oct-01 0:09

the HFONT is only a handle to the font
the HFONT variable need not last the life time of the control
once you send the WM_SETFONT message to the font then you can forget your HFONT variable
even if the HFONT variable is destroyed the font is not destroyed

for that, you may use DeleteObject

Nish

Tomasz Sowinski26-Oct-01 0:17

26-Oct-01 0:17

Sorry, you're wrong. HFONT needs to last as long as the window which uses it. If you destroy the HFONT with DeleteObject, the window painting will fail (SelectObject somewhere inside WM_PAINT handler will not work and subsequent calls to TextOut or DrawText will use default font).

Tomasz Sowinski -- http://www.shooltz.com

Nish Nishant26-Oct-01 0:23

26-Oct-01 0:23

Hello tomasz

I wasnt wrong
I clearly said that if the HFONT variable gets destroyed there is no problem as the CreateFont created front is still alive. I clearly said that for the font to be destroyed you need to call DeleteObject. But if you dont call DeleteObject your font is alive and well and you can forget about the HFONT variable

Nish

Tomasz Sowinski26-Oct-01 0:25

26-Oct-01 0:25

Let's clear things: by 'lifetime of a HFONT' I mean the time between CreateFont[Indirect] and DeleteObject. I'm not talking about local variable of type HFONT.

Tomasz Sowinski -- http://www.shooltz.com

Nish Nishant26-Oct-01 0:30

26-Oct-01 0:30

oh!

sorry tomasz....
got you wrong

my fault Frown | :-(

Nish

Tomasz Sowinski26-Oct-01 0:40

26-Oct-01 0:40

This is my fault as well - instead of technobabble like 'lifetime of a HFONT' I should just write 'you can't immediately delete a font you've set with WM_SETFONT'.

Cheers,

Tomasz Sowinski -- http://www.shooltz.com

Nish Nishant26-Oct-01 0:43

26-Oct-01 0:43

maybe...

Nish

How to detect that a user has logged in (Service & NT)

Christian Graus26-Oct-01 2:10

Christian Graus

26-Oct-01 2:10

Nish is talking about a deliberate memory leak.

Christian

After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001

EiSl25-Oct-01 21:10

EiSl

25-Oct-01 21:10

Hello folks,

I know that a service process (under NT/Win2k) should not communicate with GUI, since no user has to be logged in so no shell is available.

But...
When my service is crashing (unhandled exception), I want my general exception handler sends a messagebox to the user in case there's a user logged in.

So...
How can I detect if a shell exist (aka: a user is logged in), so I can safely shoot a messagebox.

Thanks,

EiSl

Re: How to detect that a user has logged in (Service & NT)

Nish Nishant25-Oct-01 23:41

Re: How to detect that a user has logged in (Service & NT)

25-Oct-01 23:41

hi
this might be a dumb technique but I think you can use GetDesktopWindow() and if that returns NULL, that probably means there is no user logged in

nish

Tomasz Sowinski25-Oct-01 23:54