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...limit a forms movement to the workarea?
Autor: P. Below
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Tip Rating (7):  
     


// For some reason messages.pas declares no message record for this message

type
  
TWmMoving = record
    
Msg: Cardinal;
    fwSide: Cardinal;
    lpRect: PRect;
    Result: Integer;
  end;

// Add a handler to your forms private section:

procedure WMMoving(var msg: TWMMoving); message WM_MOVING;

// Implement it as

  
procedure TFormX.WMMoving(var msg: TWMMoving);
  var
    
r: TRect;
  begin
    
r := Screen.WorkareaRect;
   // compare the new form bounds in msg.lpRect^ with r and modify it if
   // necessary
    
if msg.lprect^.left < r.left then
      
OffsetRect(msg.lprect^, r.left - msg.lprect^.left, 0);
    if msg.lprect^.top < r.top then
      
OffsetRect(msg.lprect^, 0, r.top - msg.lprect^.top);
    if msg.lprect^.right > r.right then
      
OffsetRect(msg.lprect^, r.right - msg.lprect^.right, 0);
    if msg.lprect^.bottom > r.bottom then
      
OffsetRect(msg.lprect^, 0, r.bottom - msg.lprect^.bottom);
    inherited;
  end;


 

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