CXTPPRopertySheet and OnInitDialog

I have used CXTPPropertySheet/CXTPPropertyPage instead of the standard MFC provided ones to get the alternative navigation schemes. This works OK for me except for one issue: -

When a CXTPPropertySheet is created (using DoModal()) each CXTPPropertyPage is created and its related OnInitDialog() is invoked.  In the standard CPropertySheet/CPropertyPage the OnInitDialog method is only invoked if you switch to that tab which is of course far more efficient.  This would not cause a problem apart from the fact that some of the tabs need to do a bit of processing when they are first initialized.  For example, we use a Property Sheet for our about dialog, and one of the tabs provides a list of all the applications loaded modules and their versions, which can take a good few seconds to load.  With the MFC property sheet/page this loading would only occur if one clicks the "Loaded Modules" tab, but with the CXTPPropertySheet/Page implementation the whole dialog takes about 10 seconds to load and display,

As the CXTPPropertySheet/Page classes are designed to be a *better* replacement for their MFC counterparts, I would say this is a bug? Any ideas on what I could do about this?

Gerry

Hi Oleg,

Thanks for the response.  For those of you that care about this functionality in the meantime, here is a peice of code that resolves the issue, just derive your pages from CXTPPropertyPageEx instead of CXTPPropertyPage and place the following code in your stdafx.h/.cpp files (or stand-alone files if you like. Nothing interesting going on, I just sunk the WM_INITDIALOG message and invoke OnInitDialog() method from the OnSetActive() method...

Perhaps the good folks at codejock will see their way to including this behavior in future library releases.

Gerry

 

///////////////////////////////////////////////////////////////////////////////////
// For stdafx.h
class CXTPPropertyPageEx : public CXTPPropertyPage
{
public:
 CXTPPropertyPageEx();
 CXTPPropertyPageEx(UINT nIDTemplate, UINT nIDCaption = 0);
 CXTPPropertyPageEx(LPCTSTR lpszTemplateName, UINT nIDCaption = 0);
// Implementation
protected:
 DECLARE_MESSAGE_MAP()
 virtual BOOL OnSetActive()
 {
  if(m_bInitUpdate)
  {
   OnInitDialog();
   m_bInitUpdate = false;
  }
  return CXTPPropertyPage::OnSetActive();
 }
private:
 LRESULT OnInitDialogEx(WPARAM, LPARAM) 
 {
  // Make sure that all DDX controls are sub-classed when the dialog is initialized
  // If not, when any of the sub-classed objects are accessed before the page is displayed MFC asserts (rightly)
  UpdateData(FALSE);

  return 0;
 }
 bool m_bInitUpdate;
};
///////////////////////////////////////////////////////////////////////////////////
// For stdafx.cpp
CXTPPropertyPageEx::CXTPPropertyPageEx()
{
 m_bInitUpdate = true;
}
CXTPPropertyPageEx::CXTPPropertyPageEx(UINT nIDTemplate, UINT nIDCaption)
 : CXTPPropertyPage(nIDTemplate, nIDCaption)
{
 m_bInitUpdate = true;
}
CXTPPropertyPageEx::CXTPPropertyPageEx(LPCTSTR lpszTemplateName, UINT nIDCaption)
 : CXTPPropertyPage(lpszTemplateName, nIDCaption)
{
 m_bInitUpdate = true;
}
BEGIN_MESSAGE_MAP(CXTPPropertyPageEx, CXTPPropertyPage)
 //{{AFX_MSG_MAP(CXTPPropertyPageEx)
 ON_MESSAGE(WM_INITDIALOG, OnInitDialogEx)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()
///////////////////////////////////////////////////////////////////////////////////////