duilib 可拉动改变窗口大小

xml 

<Window size="300,600" caption="0,0,180,30" roundcorner="5,5" sizebox="10,10,10,10" mininfo="280,70" maxinfo="300,700" >

响应消息：

LRESULT CSubtitleWindow::OnNcHitTest(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    POINT pt; pt.x = GET_X_LPARAM(lParam); pt.y = GET_Y_LPARAM(lParam);
    ::ScreenToClient(*this, &pt);

    RECT rcClient;
    ::GetClientRect(*this, &rcClient);

    if (!::IsZoomed(*this))
    {
        RECT rcSizeBox = m_PaintManager.GetSizeBox();    // GetSizeBox用来获取xml中Window标签的sizebox属性，该属性指示你的鼠标移动到窗口边框多少个像素会变成指示符（这个指示符表示可以改变窗口大小的指示符）
        if (pt.y < rcClient.top + rcSizeBox.top) {
            if (pt.x < rcClient.left + rcSizeBox.left) return HTTOPLEFT;
            if (pt.x > rcClient.right - rcSizeBox.right) return HTTOPRIGHT;
            return HTTOP;

        }
        else if (pt.y > rcClient.bottom - rcSizeBox.bottom) {
            if (pt.x < rcClient.left + rcSizeBox.left) return HTBOTTOMLEFT;
            if (pt.x > rcClient.right - rcSizeBox.right) return HTBOTTOMRIGHT;
            return HTBOTTOM;

        }
        if (pt.x < rcClient.left + rcSizeBox.left) return HTLEFT;
        if (pt.x > rcClient.right - rcSizeBox.right) return HTRIGHT;
    }

    RECT rcCaption = m_PaintManager.GetCaptionRect();
    if (pt.x >= rcClient.left + rcCaption.left && pt.x < rcClient.left + rcCaption.right\
        && pt.y >= rcCaption.top && pt.y < rcCaption.bottom) {
        return HTCAPTION;
    }

    return HTCLIENT;
}