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Author |
Date |
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pascal bosquet
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Nov 26, 2004 - 1:57 AM
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Hello there,
I’m new to prof-uis(freeware) and mfc, so my question will surely be easy for you ;) I’d like to display a picture in a CExtControlBar and being able to scroll if the picture is too big. For this i’ve a class which inherit from CExtScrollWnd. Your articles mention that for using a CExtScrollWnd i have to create my bars myself and set their parents to the CExtScrollWnd. So here come my problem. I’ve overloaded the Create function CExtScrollWnd so i can create my 2 bars. But the troubles is that the CWnd:Create() will call the GetScrollBarCtrl() which are not created yet. So my app crash. But how can i create the Bars if the parent doesn’t exist yet, and how can i create the the CExtScrollWnd if the bars doesn’t exist yet ? i’m confused. I don’t see how i can solve this
thanks in advance for your clues
Pascal
BOOL CBankPanel::Create(LPCTSTR lpszClassName,
LPCTSTR lpszWindowName,
DWORD dwStyle,
const RECT& rect,
CWnd* pParentWnd,
UINT nID,
CCreateContext* pContext)
{
BOOL ret;
if(!CWnd::Create( lpszClassName,
lpszWindowName,
dwStyle,
rect,
pParentWnd,
nID,
pContext))
{
ASSERT(FALSE);
return FALSE;
}
// create the bars
if(!m_HBar.Create(SBS_HORZ | SBS_TOPALIGN | WS_CHILD, CRect(5, 5, 100, 30), this,10000))
{
ASSERT(FALSE);
return FALSE;
}
if(!m_VBar.Create(SBS_VERT | SBS_LEFTALIGN | WS_CHILD, CRect(5, 5, 100, 30), this,10001))
{
ASSERT(FALSE);
return FALSE;
}
return TRUE;
}
CScrollBar* CBankPanel::GetScrollBarCtrl(int nBar) const
{
if(nBar==SB_HORZ)
return (CScrollBar*)&m_HBar;
else
return (CScrollBar*)&m_VBar;
}
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Technical Support
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Nov 26, 2004 - 11:19 AM
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At least the CBankPanel::GetScrollBarCtrl method should look like this:CScrollBar * CBankPanel::GetScrollBarCtrl(int nBar) const
{
if(nBar==SB_HORZ)
return (CScrollBar*) ( (m_HBar.GetSafeHwnd() != NULL) ? (&m_HBar) : NULL );
else
return (CScrollBar*) ( (m_VBar.GetSafeHwnd() != NULL) ? (&m_VBar) : NULL );
}
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