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How to set the text blinking?

Posted on 1998-10-15
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Last Modified: 2010-05-18
I want to set the text on my dialog blinking?
How to do it, please help!
I'm not using MFC, but WIN32 SDK.
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Question by:softyan
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Answers2000 earned 200 total points
ID: 1253550
Unfortunately there isn't a "flashing" attribute for dialog text under Windows.  This means you have to flash it yourself.

Also unfortunately the FlashWindow API (if you heard of it) is no help.  It simply flashes the window caption.  Assuming you mean a control on the dialog - e.g. a static.  This is no help either.

Okay - here are the steps:
1. Add a static UINT to your dialog which is the Timer Id

static UINT uTimerId = 0 ;

2. Use the SetTimer API call to create a Timer.  Do this  in WM_INITDIALOG.

uTimerId = SetTimer( hDlg, 1, 1000 /* Time in Millisecs */, NULL ) ;

3. Before closing your dialog kill the timer, (e.g. before calling EndDialog in response to the OK button)

if ( uTimerId != 0 )
{
  KillTimer( hDlg, uTimerId ) ;
}

4. Process the WM_TIMER message sent to your dialog and causing flashing here.

case WM_TIMER:
  /* Flashing code */

5. What is flashing code - I'll assume you just want to make the a control appear/reappear.  If yes - try this

{
HWND hWndItem = GetDlgItem( hDlg, ID_CONTROL ) ; /* ID_CONTROL = the id of the control - e.g. a static - to link
if ( IsWindowVisible(hWndItem) )
{
   ShowWindow(  hWndItem, SW_HIDE ) ;
} else
{
   ShowWindow( hWndItem, SW_SHOW ) ;
}

If you don't like #5 change the code to cause whatever kind of flashing you want

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Author Comment

by:softyan
ID: 1253551
Can i ask u a question?
Your suggestion is great, but how if i want to change the colour of the static text?
I will increase the point to 70 if u can give me a guide!
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LVL 8

Expert Comment

by:Answers2000
ID: 1253552
You can't increase the pts - as you've already accepted it!

To change the color process the WM_CTLCOLORSTATIC message


To make it flash:
- use my code above

- add variables to dlg proc :-
 static COLORREF m_crText[2] ;
 static COLORREF m_crBack[2] ;
 static HBRUSH m_brush[2] ;
 int m_nWhichColor = 0 ;

- in WM_INITDIALOG
m_crText[0] = RGB(255,0,0) ; // red text
m_crText[1] = RGB(0,0,255) ; // blue text
m_crBack[0] = RGB(255,255,255) ; // white background
m_crBack[1] = RGB(0,255,0) ; // green background
m_brush[0] = ::CreateSolidBrush( m_crBack[0] ) ;
m_brush[1] = ::CreateSolidBrush( m_crBack[1] ) ;
m_nWhichColor = 0 ;

- when dialog exits
::DeleteObject( m_brush[0] ) ;
::DeleteObject( m_brush[1] ) ;

- modify step #5 of my original answer

m_nWhichColor ^= 1 ; // flip between 1 and 0
HWND hWndItem = GetDlgItem( hDlg, ID_CONTROL ) ; /* ID_CONTROL = the id of the control - e.g. a static - to link
::InvalidateRect( hWndItem, NULL, FALSE ) ;
::UpdateWindow( hWndItem ) ;

- for WM_CTLCOLORSTATIC, do something like:

HWND hWndItem = GetDlgItem( hDlg, ID_CONTROL ) ;

if ( hWndItem == ((HWND)lParam) )
{
  pDC->SetTextColor( m_crText[m_nWhichColor] ) ;
  pDC->SetBkColor( m_crBack[m_nWhichColor] ) ;
  return m_brush[m_nWhichColor] ;
}
// otherwise call DefWndProc
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