Adding a resize anchor to derived CMFCPropertyShee

问题:

Thanks to the support of Stack Overflow I have been able to create my own CResizingMFCPropertySheet that supports resizing. Now, I went to add a resize anchor and I used this code:

void CResizingMFCPropertySheet::InitialiseResizeIcon()
{
    CRect rcIcon, rcClient;

    m_bmpResize.LoadOEMBitmap(OBM_SIZE);
    m_lblResize.Create(0, WS_CHILD | WS_VISIBLE | SS_BITMAP, 
               CRect(0, 0, 16, 16), this, IDC_STATIC_RESIZE);
    m_lblResize.SetBitmap(m_bmpResize);

    GetClientRect(rcClient);
    m_lblResize.GetClientRect(rcIcon);
    m_lblResize.SetWindowPos(&CWnd::wndTop, rcClient.right - rcIcon.Width(), 
               rcClient.bottom - rcIcon.Height(), 0, 0, SWP_NOSIZE);
}

(Note: The above code is revised and no longer uses dynamic layout - doesn't work).

The method gets called in OnInitDialog. When the sheet is first displayed it looks OK:

You can see the anchor in the bottom right. Now, when i go to resize the window:

As you can see it is not rendering the anchor properly.

Update

I have set WS_CLIPSIBLINGS and it makes no difference.

Update

Just to let everyone know the reason the new themed gripper was not working right was because I did not add the OnNcHitTest handler etc.

回答1:

I've never tried that, I did some searching and there appears to be some issues in doing this dynamically. Some said it cannot be done, others seem to propose ways of doing it. Here is are some of the better links I found, hope this helps.

How to add a gripper to a PropertySheet?

https://www.codeproject.com/Tips/214744/How-to-implement-a-resizable-property-sheet-class

https://social.msdn.microsoft.com/Forums/vstudio/en-US/2a85d3a9-3f91-482c-8bc3-02e132035c7f/cannot-resize-a-new-cmfcpropertysheetcmfcpropertypage?forum=vcgeneral

https://www.codeguru.com/cpp/controls/propertysheet/article.php/c543/Resizing-the-Property-Sheet.htm

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This one helped in the end:

Making a CMFCPropertySheet resizable with dynamic layouts

The answer there explains how to correctly drawn custom child controls with OnSize.

回答2:

Modify the style for CMFCPropertySheet and add WS_CLIPSIBLINGS!

Add WS_CLIPSIBLINGS to the gripper window too.

Add WS_CLIPCHILDREN to the CPropertySheet.