Question

I Have an edit control (a text field) which I want to animate. The animation I want is that it slides out, creating an extra line for this text field. I am able to animate my text field and able to make it larger, however to show the sliding animation I first have to hide it. This means the entire text fields slides out as if being created for the first time from nothing, instead of just adding a new line.

This is the code I have now:

SetWindowPos(hwnd, HWND_TOP, x, y, newWidth, newHeight, SWP_DRAWFRAME);

ShowWindow(hwnd, SW_HIDE);

AnimateWindow(hwnd, 300, AW_SLIDE | AW_VER_NEGATIVE);

Is it possible to show this animation without hiding it?

Answer 1

To expand on Nick D’s answer, here’s the code to achieve what you’re looking for…

.h

#define ANIMATION_TIMER 1234
#define ANIMATION_LIMIT 8
#define ANIMATION_OFFSET 4

int m_nAnimationCount;

---

.cpp

void CExampleDlg::OnTimer(UINT_PTR nIDEvent)
{
    if (nIDEvent == ANIMATION_TIMER)
    {
        if (++m_nAnimationCount > ANIMATION_LIMIT)
            KillTimer(EXPAND_TIMER);
        else
        {
            CRect rcExpand;
            m_edtExpand.GetWindowRect(rcExpand);
            ScreenToClient(rcExpand);

            rcExpand.bottom += ANIMATION_OFFSET;

            m_edtExpand.MoveWindow(rcExpand);
        }   
    }

    CDialog::OnTimer(nIDEvent);
}

void CExampleDlg::OnStartAnimation()
{
    m_nAnimationCount = 0;
    SetTimer(ANIMATION_TIMER, 20, NULL);
}

Don’t forget to set the Multiline property on the edit control (m_edtExpand)