Windows平台RTMP|RTSP播放器实现画面全屏功能

void nt_wrapper_render_wnd::FullScreenSwitch()
{
    if ( !::IsWindow(m_hWnd) )
        return;
 
    if (player_handle_ != nullptr)
    {
        player_api_.SetRenderARGBLogo(player_handle_, nullptr, 0, 0, 0, 0, 0, 0, 0);
    }
 
    if ( !IsFullScreen() )
    {
        if ( !IsCanFullScreen() )
            return;
 
        auto old_wnd = GetParent();
        if ( old_wnd == NULL )
            return;
 
        old_parent_wnd_ = old_wnd->m_hWnd;
        ASSERT(::IsWindow(old_parent_wnd_));
 
        GetWindowRect(&old_rect_);
        old_wnd->ScreenToClient(old_rect_);
    
        HMONITOR hMonitor = ::MonitorFromWindow(m_hWnd, MONITOR_DEFAULTTONEAREST);
        if (hMonitor == NULL)
            return;
 
        MONITORINFOEX mi;
        mi.cbSize = sizeof(mi);
 
        if ( !GetMonitorInfo(hMonitor, &mi) )
            return;
 
 
        ::SetParent(m_hWnd, NULL);
 
        auto wnd_styles = GetWindowLongPtr(m_hWnd, GWL_STYLE);
        wnd_styles = wnd_styles & (~WS_CHILD);  
        wnd_styles |= WS_POPUP;
        ::SetWindowLongPtr(m_hWnd, GWL_STYLE, wnd_styles);
 
        // 隐藏老窗口
        ::ShowWindow(old_parent_wnd_, SW_HIDE);
 
        is_full_screen_ = true;
 
        ::SetWindowPos(m_hWnd, HWND_TOP, mi.rcMonitor.left,
            mi.rcMonitor.top,
            mi.rcMonitor.right - mi.rcMonitor.left,
            mi.rcMonitor.bottom - mi.rcMonitor.top,
            SWP_FRAMECHANGED);
 
        ::SetForegroundWindow(m_hWnd);
 
        ::RedrawWindow(m_hWnd, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW
            | RDW_ERASE);
 
        ::RedrawWindow(NULL, NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW
            | RDW_ERASE);
    }
    else
    {
        ::ShowWindow(old_parent_wnd_, SW_SHOW);
 
        auto wnd_styles = GetWindowLongPtr(m_hWnd, GWL_STYLE);
        wnd_styles = wnd_styles & (~WS_POPUP);
        wnd_styles |= WS_CHILD;
        auto ret = SetWindowLongPtr(m_hWnd, GWL_STYLE, wnd_styles);
 
        ::SetParent(m_hWnd, old_parent_wnd_);
 
        is_full_screen_ = false;
 
        MoveWindow(old_rect_, TRUE);
    }
}

void nt_wrapper_render_wnd::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
    // TODO: Add your message handler code here and/or call default
    
    // 全屏的时候，按ESC将退出全屏
    if ( nChar == VK_ESCAPE )
    {
        if ( IsFullScreen() )
        {
            FullScreenSwitch();
        }
    }
 
    CWnd::OnChar(nChar, nRepCnt, nFlags);
}