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Blinking item in TListView

Posted on 2004-08-03
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Last Modified: 2010-04-05
How may I blink a specific item in TListView?

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Question by:faustomen
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3 Comments
 
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Colin_Dawson earned 500 total points
ID: 11705519
You need to make your own drawing routine for the TListview.  Take a look at OnDrawItem,  then you'll need to add a TTimer, that will control the blinking.  don't use .Paint, but use .invalidate to ask the TListview to re-draw.
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LVL 26

Expert Comment

by:Russell Libby
ID: 11708365

Something like the following will allow you to "blink" (it inverts the image)  the list item without having to use a timer, and without having to implement owner-drawing. May make things a little easier to implement....

Regards,
Russell

procedure BlinkListItem(Item: TListItem);
var  hdcPaint:      HDC;
      rcBounds:      TRect;
begin

  // Check assignment
  if Assigned(Item) then
  begin
     // Get the bounds rect for the item
     rcBounds:=Item.DisplayRect(drBounds);
     // Get the window DC
     hdcPaint:=GetDC(Item.Handle);
     // Invert the item
     Assert(InvertRect(hdcPaint, rcBounds), 'Failed to invert the rectangle');
     // Release the dc
     ReleaseDC(Item.Handle, hdcPaint);
     // Validate the item rectangle
     ValidateRect(Item.Handle, @rcBounds);
     // Delay
     Sleep(500);
     // Have the item repaint
     InvalidateRect(Item.Handle, @rcBounds, True);
  end;

end;

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LVL 4

Expert Comment

by:Colin_Dawson
ID: 11743720
I'm glad that I gave you enough information to be able to solve this problem.
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