Duilib 实现右下角弹出像QQ新闻窗口，3秒后窗口透明度渐变最后关闭，若在渐变过程中鼠标放到窗口上，窗口恢复最初状态(二)

效果：

1.定义两个个定时器ID

#define ID_TIMER_DISPLAY_DELAY 30
#define ID_TIMER_DISPLAY_CLOSE 40

2.添加一个成员函数和成员变量

void SetAlpha(HWND hWnd,int Alpha);

int m_nFlag ;

void CPopUpWnd::SetAlpha(HWND hWnd,int Alpha)
{

HINSTANCE hInst = LoadLibrary(L"User32.DLL");
  if(hInst)
  {
    typedef BOOL (WINAPI *MYFUNC)(HWND,COLORREF,BYTE,DWORD);
    MYFUNC fun = NULL;
   //取得SetLayeredWindowAttributes函数指针
   fun=(MYFUNC)GetProcAddress(hInst, "SetLayeredWindowAttributes");
   if(fun)fun(hWnd,0,Alpha,2);
   FreeLibrary(hInst);
   }

}

3.修改窗口属性

void CPopUpWnd::OnPrepare()
{
    //直接显示在右下角
    MoveSelfWindow();

    //修改窗口属性为了窗口透明度
    SetWindowLong(m_hWnd,GWL_EXSTYLE,GetWindowLong(m_hWnd,GWL_EXSTYLE)^0x80000);

//3秒后改变窗口透明度
     SetTimer(m_hWnd,ID_TIMER_DISPLAY_DELAY,3000,NULL);

}

4.在定时器响应函数里

LRESULT CPopUpWnd::OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam,BOOL& bHandled)
{

    switch(wParam)
    {//多个定时器

    case ID_TIMER_DISPLAY_DELAY:
        KillTimer(m_hWnd,ID_TIMER_DISPLAY_DELAY);
        SetTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE,,NULL);
        break;
    case ID_TIMER_DISPLAY_CLOSE:
        {
            if(m_nFlag < )
            {
                m_nFlag+= ;
                SetAlpha(m_hWnd,-m_nFlag);
            }
            else
            {
                KillTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE);
                Close(IDCLOSE);
                m_nFlag = ;
            }
        }
        break;
    }
    return ;
}

5.窗口渐变关闭过程中，鼠标经过窗口，关闭定时器，窗口恢复原状

LRESULT CPopUpWnd::OnMouseEnter(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{

       .....

    //KillTimer(m_hWnd,ID_TIMER_DISPLAY_DELAY);
    KillTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE);
    if (m_nFlag < )
    {
        SetAlpha(m_hWnd,);
    }

      ....

    return ;
}

6.鼠标出了窗口，开启定时器继续渐变关闭窗口

LRESULT CPopUpWnd::OnMouseLeave(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    .....

    SetTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE,,NULL);
    m_nFlag = ;

       ....
    return ;
}