Resizing a modeless property sheet - c++

Question

I have a class derived from CPropertysheet. It has two property pages in it. I have made the sheet modeless. But resizing using the mouse drag is not possible. How to make the propertysheet a resizable one?

Answer 1

For modal property sheet see links in comment section. For modeless version, create the property sheet with WS_THICKFRAME. This is enough to make the dialog resizable. For example:
propSheet->Create(this, WS_THICKFRAME |
WS_VISIBLE | WS_SYSMENU | WS_POPUP | WS_VISIBLE | WS_CAPTION);
To handle the resizing, add the following members:
class CMyPropertySheet:public CPropertySheet
{
CRect save_rc;//used in OnSize
CRect minimum_rc;//used in OnGetMinMaxInfo
BOOL OnInitDialog();
void OnSize(UINT nType, int cx, int cy);
void OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI);
...
};
Overload OnInitDialog as follows:
BOOL CMyPropertySheet::OnInitDialog()
{
//override for modeless:
m_bModeless = FALSE;
m_nFlags |= WF_CONTINUEMODAL;
BOOL bResult = CPropertySheet::OnInitDialog();
m_bModeless = TRUE;
m_nFlags &= ~WF_CONTINUEMODAL;
//save rectangles for resizing
GetClientRect(&save_rc); //save the old rect for resizing
GetClientRect(&minimum_rc); //save the original rect for OnGetMinMaxInfo
return bResult;
}
The rest of it is explained in MSDN example:
void CMyPropertySheet::OnSize(UINT nType, int cx, int cy)
{
CPropertySheet::OnSize(nType, cx, cy);
if(nType == SIZE_MINIMIZED)
return;
if (!GetActivePage()) return;
if (!GetTabControl()) return;
int dx = cx - save_rc.Width();
int dy = cy - save_rc.Height();
//count how many childs are in window
int count = 0;
for(CWnd *child = GetWindow(GW_CHILD); child; child = child->GetWindow(GW_HWNDNEXT))
count++;
HDWP hDWP = ::BeginDeferWindowPos(count);
for (CWnd *child = GetWindow(GW_CHILD); child; child = child->GetWindow(GW_HWNDNEXT))
{
CRect r;
child->GetWindowRect(&r);
ScreenToClient(&r);
if (child->SendMessage(WM_GETDLGCODE) & DLGC_BUTTON)
{
r.left += dx;
r.top += dy;
::DeferWindowPos(hDWP, child->m_hWnd, 0, r.left, r.top, 0, 0,
SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
}
else
{
r.right += dx;
r.bottom += dy;
::DeferWindowPos(hDWP, child->m_hWnd, 0, 0, 0, r.Width(), r.Height(),
SWP_NOMOVE | SWP_NOZORDER | SWP_NOACTIVATE);
}
}
::EndDeferWindowPos(hDWP);
GetClientRect(&save_rc);
}
void CMyPropertySheet::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI)
{
lpMMI->ptMinTrackSize.x = minimum_rc.Width();
lpMMI->ptMinTrackSize.y = minimum_rc.Height();
CPropertySheet::OnGetMinMaxInfo(lpMMI);
}
Also add ON_WM_SIZE and ON_WM_GETMINMAXINFO to message map