Resizing window not working properly MFC

Question

I have created a customized class with inheriting CDockablepane in SDI application MFC. for ex.

class CLoginPage :  public CDockablePane
{
    public:
    CLoginPage();
protected:
    CStatic lbl_username;
    CStatic lbl_password;
    CEdit txt_username;
    CEdit txt_password;
    CButton btn_login;
    CButton btn_Signup;
protected:
    afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
    afx_msg void OnSize(UINT nType, int cx, int cy);

    DECLARE_MESSAGE_MAP()
};

in .cpp I override oncreate function and onsize funtion

int CLoginPage::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
    if (CDockablePane::OnCreate(lpCreateStruct) == -1)
        return -1;

    if(!lbl_username.Create(_T("User Name"), WS_CHILD | WS_VISIBLE, CRect(150, 150, 100, 30), this, ID_STATIC_USERNAME))
    {
        TRACE0("Failed to create userName in LoginPage window\n");
        return -1;
    }
 ......................................same for other control
}


void CLoginPage::OnSize(UINT nType, int cx, int cy)
{
    CDockablePane::OnSize(nType, cx, cy);

    // Tab control should cover the whole client area:
    CRect rectClient;
    this->GetWindowRect(rectClient);

    lbl_username.SetWindowPos (NULL, rectClient.left+150, rectClient.top+150, 100, 30, SWP_NOMOVE | SWP_NOACTIVATE | SWP_NOZORDER);
.............................same for other control
}

when I run this it is displaying correctly as present in below image.

but after resize login window or move login window, it display very badly. please see below image

I don't know how to resolve this. Do I need to do something in WM_PAINT message or something else. I tried a lot but i din't get any option. Can someone please help me on this??

Answer 1

You want to change position but why do you pass SWP_NOMOVE into SetWindowPos?

Do you know that in Visual Studio 2015 you have possibility to manage dialog layout with dynamic layouts: https://msdn.microsoft.com/en-us/library/mt270148.aspx ? The best dynamic layouts tutorial is http://mariusbancila.ro/blog/2015/07/27/dynamic-dialog-layout-for-mfc-in-visual-c-2015/

Answer 2

For the record, the MFC drawing problem -- stuttering lines when moving or sizing a tool window or tool bar was a Windows bug and only occurred with multiple monitors. It was fixed in Windows 10 1803 but reintroduced in 1809 and fixed in March, 2020 in 1903 and 1909.

https://support.microsoft.com/en-us/help/4541335/windows-10-update-kb4541335

The description in the KB article (must expand collapsed links):

Addresses a drawing issue with the Microsoft Foundation Class (MFC) toolbar that occurs when dragging in a multi-monitor environment.