I created a custom control whose class has CStatic
as base class. Currently I handle the drawing using WM_PAINT
event. But there is a strange behavior. When I re-enable the window after disabling it using CWnd::EnableWindow
function, it refuses to draw what I written in OnPaint
function. It draws the static control instead.
I agree that there is this standard method of overriding DrawItem
and using SS_OWNERDRAW
style. But what's wrong with WM_PAINT
?
void XXControl::OnPaint()
{
CPaintDC PaintDC( this );
// ** draw the control to PaintDC**
}
Here is exactly what I have written:
class CMyStatic : public CStatic
{
DECLARE_MESSAGE_MAP()
public:
void OnPaint(void);
};
BEGIN_MESSAGE_MAP(CMyStatic, CStatic)
ON_WM_PAINT()
END_MESSAGE_MAP()
void CMyStatic::OnPaint(void)
{
CPaintDC dc(this);
CRect rect;
GetClientRect(&rect);
dc.FillSolidRect(&rect, RGB(120,255,0));
}
And subclassed:
class CMyDlg : public CDialog
{
// Construction
CMyStatic my_static;
...
};
BOOL CCMyDlg::OnInitDialog()
{
CDialog::OnInitDialog();
my_static.SubclassDlgItem(IDC_DRAW, this);
return true;
}
Where IDC_DRAW
is static control on resource for this dialog. I wrote two button handlers:
void CMyDlg::OnBnClickedOk()
{
my_static.EnableWindow(FALSE);
my_static.Invalidate();
}
void CMyDlg::OnBnClickedOk2()
{
my_static.EnableWindow();
my_static.Invalidate();
}
And it works flawlessly! Remove Invalidate
call and it would fail.
Try turning off Aero. I'm having a similiar problem where I'm drawing a static control and when it goes from disabled to enabled the WM_PAINT message is never received, but if I turn Aero off it works fine.