mediactrl.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

//
// Volume ranges from -1.0 (gain but no sound), 0 (no sound and no gain) to
// 1 (full gain and sound)
//---------------------------------------------------------------------------
bool wxQTMediaBackend::SetVolume(double dVolume)
{
    ::SetMovieVolume(m_movie, (short) (dVolume * 256));
    return true;
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::GetDuration
//
// Calls GetMovieDuration
//---------------------------------------------------------------------------
wxLongLong wxQTMediaBackend::GetDuration()
{
    return ::GetMovieDuration(m_movie);
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::GetState
//
// Determines the current state - the timer keeps track of whether or not
// we are paused or stopped (if the timer is running we are playing)
//---------------------------------------------------------------------------
wxMediaState wxQTMediaBackend::GetState()
{
    // Could use
    // GetMovieActive/IsMovieDone/SetMovieActive
    // combo if implemented that way
    if (m_bPlaying)
        return wxMEDIASTATE_PLAYING;
    else if (!m_movie || wxQTMediaBackend::GetPosition() == 0)
        return wxMEDIASTATE_STOPPED;
    else
        return wxMEDIASTATE_PAUSED;
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::Cleanup
//
// Diposes of the movie timer, Control if native, and stops and disposes
// of the QT movie
//---------------------------------------------------------------------------
void wxQTMediaBackend::Cleanup()
{
    m_bPlaying = false;
    if (m_timer)
    {
        delete m_timer;
        m_timer = NULL;
    }

    // Stop the movie:
    // Apple samples with CreateMovieControl typically
    // install a event handler and do this on the dispose
    // event, but we do it here for simplicity
    // (It might keep playing for several seconds after
    // control destruction if not)
    wxQTMediaBackend::Pause();

    // Dispose of control or remove movie from MovieController
    Point thePoint;
    thePoint.h = thePoint.v = 0;
    ::MCSetVisible(m_mc, false);
    ::MCSetMovie(m_mc, NULL, NULL, thePoint);

    ::DisposeMovie(m_movie);
    m_movie = NULL;
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::GetVideoSize
//
// Returns the actual size of the QT movie
//---------------------------------------------------------------------------
wxSize wxQTMediaBackend::GetVideoSize() const
{
    return m_bestSize;
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::Move
//
// Move the movie controller or movie control
// (we need to actually move the movie control manually...)
// Top 10 things to do with quicktime in March 93's issue
// of DEVELOP - very useful
// http:// www.mactech.com/articles/develop/issue_13/031-033_QuickTime_column.html
// OLD NOTE: Calling MCSetControllerBoundsRect without detaching
//          supposively resulted in a crash back then. Current code even
//          with CFM classic runs fine. If there is ever a problem,
//          take out the if 0 lines below
//---------------------------------------------------------------------------
void wxQTMediaBackend::Move(int x, int y, int w, int h)
{
    if (m_timer)
    {
        m_ctrl->GetParent()->MacWindowToRootWindow(&x, &y);
        Rect theRect = {y, x, y + h, x + w};

#if 0 // see note above
        ::MCSetControllerAttached(m_mc, false);
         wxASSERT(::GetMoviesError() == noErr);
#endif

        ::MCSetControllerBoundsRect(m_mc, &theRect);
        wxASSERT(::GetMoviesError() == noErr);

#if 0 // see note above
        if (m_interfaceflags)
        {
            ::MCSetVisible(m_mc, true);
            wxASSERT(::GetMoviesError() == noErr);
        }
#endif
    }
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::DoSetControllerVisible
//
// Utility function that takes care of showing the moviecontroller
// and showing/hiding the particular controls on it
//---------------------------------------------------------------------------
void wxQTMediaBackend::DoSetControllerVisible(
                        wxMediaCtrlPlayerControls flags)
{
    ::MCSetVisible(m_mc, true);

    // Take care of subcontrols
    if (::GetMoviesError() == noErr)
    {
        long mcFlags = 0;
        ::MCDoAction(m_mc, 39/*mcActionGetFlags*/, (void*)&mcFlags);

        if (::GetMoviesError() == noErr)
        {
             mcFlags |= (  //(1<<0)/*mcFlagSuppressMovieFrame*/ |
                     (1 << 3)/*mcFlagsUseWindowPalette*/
                       | ((flags & wxMEDIACTRLPLAYERCONTROLS_STEP)
                          ? 0 : (1 << 1)/*mcFlagSuppressStepButtons*/)
                       | ((flags & wxMEDIACTRLPLAYERCONTROLS_VOLUME)
                          ? 0 : (1 << 2)/*mcFlagSuppressSpeakerButton*/)
                          //if we take care of repainting ourselves
         //              | (1 << 4) /*mcFlagDontInvalidate*/
                          );

            ::MCDoAction(m_mc, 38/*mcActionSetFlags*/, (void*)mcFlags);
        }
    }

    // Adjust height and width of best size for movie controller
    // if the user wants it shown
    m_bestSize.x = m_bestSize.x > wxMCWIDTH ? m_bestSize.x : wxMCWIDTH;
    m_bestSize.y += wxMCHEIGHT;
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::ShowPlayerControls
//
// Shows/Hides subcontrols on the media control
//---------------------------------------------------------------------------
bool wxQTMediaBackend::ShowPlayerControls(wxMediaCtrlPlayerControls flags)
{
    if (!m_mc)
        return false; // no movie controller...

    bool bSizeChanged = false;

    // if the controller is visible and we want to hide it do so
    if (m_interfaceflags && !flags)
    {
        bSizeChanged = true;
        DoLoadBestSize();
        ::MCSetVisible(m_mc, false);
    }
    else if (!m_interfaceflags && flags) // show controller if hidden
    {
        bSizeChanged = true;
        DoSetControllerVisible(flags);
    }

    // readjust parent sizers
    if (bSizeChanged)
    {
        NotifyMovieSizeChanged();

        // remember state in case of loading new media
        m_interfaceflags = flags;
    }

    return ::GetMoviesError() == noErr;
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::GetDataSizeFromStart
//
// Calls either GetMovieDataSize or GetMovieDataSize64 with a value
// of 0 for the starting value
//---------------------------------------------------------------------------
wxLongLong wxQTMediaBackend::GetDataSizeFromStart(TimeValue end)
{
#if 0 // old pre-qt4 way
    return ::GetMovieDataSize(m_movie, 0, end)
#else // qt4 way
    wide llDataSize;
    ::GetMovieDataSize64(m_movie, 0, end, &llDataSize);
    return wxLongLong(llDataSize.hi, llDataSize.lo);
#endif
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::GetDownloadProgress
//---------------------------------------------------------------------------
wxLongLong wxQTMediaBackend::GetDownloadProgress()
{
#if 0 // hackish and slow
    Handle hMovie = NewHandle(0);
    PutMovieIntoHandle(m_movie, hMovie);
    long lSize = GetHandleSize(hMovie);
    DisposeHandle(hMovie);

    return lSize;
#else
    TimeValue tv;
    if (::GetMaxLoadedTimeInMovie(m_movie, &tv) != noErr)
    {
        wxLogDebug(wxT("GetMaxLoadedTimeInMovie failed"));
        return 0;
    }

    return wxQTMediaBackend::GetDataSizeFromStart(tv);
#endif
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::GetDownloadTotal
//---------------------------------------------------------------------------
wxLongLong wxQTMediaBackend::GetDownloadTotal()
{
    return wxQTMediaBackend::GetDataSizeFromStart(
                    ::GetMovieDuration(m_movie)
                                                 );
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::MacVisibilityChanged
//
// The main problem here is that Windows quicktime, for example,
// renders more directly to a HWND. Mac quicktime does not do this
// and instead renders to the port of the WindowRef/WindowPtr on top
// of everything else/all other windows.
//
// So, for example, if you were to have a CreateTabsControl/wxNotebook
// and change pages, even if you called HIViewSetVisible/SetControlVisibility
// directly the movie will still continue playing on top of everything else
// if you went to a different tab.
//
// Note that another issue, and why we call MCSetControllerPort instead
// of SetMovieGWorld directly, is that in addition to rendering on
// top of everything else the last created controller steals mouse and
// other input from everything else in the window, including other
// controllers. Setting the port of it releases this behaviour.
//---------------------------------------------------------------------------
void wxQTMediaBackend::MacVisibilityChanged()
{
    if(!m_mc || !m_ctrl->m_bLoaded)
        return; //not initialized yet

    if(m_ctrl->MacIsReallyShown())
    {
        //The window is being shown again, so set the GWorld of the
        //controller back to the port of the parent WindowRef
        WindowRef wrTLW =
            (WindowRef) m_ctrl->MacGetTopLevelWindowRef();

        ::MCSetControllerPort(m_mc, (CGrafPtr) GetWindowPort(wrTLW));
        wxASSERT(::GetMoviesError() == noErr);
    }
    else
    {
        //We are being hidden - set the GWorld of the controller
        //to the offscreen GWorld
        ::MCSetControllerPort(m_mc, m_movieWorld);
        wxASSERT(::GetMoviesError() == noErr);
    }
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::OnEraseBackground
//
// Suggestion from Greg Hazel to repaint the movie when idle
// (on pause also)
//---------------------------------------------------------------------------
void wxQTMediaEvtHandler::OnEraseBackground(wxEraseEvent& evt)
{
    // Work around Nasty OSX drawing bug:
    // http://lists.apple.com/archives/QuickTime-API/2002/Feb/msg00311.html
    WindowRef wrTLW = (WindowRef) m_qtb->m_ctrl->MacGetTopLevelWindowRef();

    RgnHandle region = ::MCGetControllerBoundsRgn(m_qtb->m_mc);
    ::MCInvalidate(m_qtb->m_mc, wrTLW, region);
    ::MCIdle(m_qtb->m_mc);
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::PPRMProc (static)
//
// Called when done PrePrerolling the movie.
// Note that in 99% of the cases this does nothing...
// Anyway we set up the loading timer here to tell us when the movie is done
//---------------------------------------------------------------------------
pascal void wxQTMediaBackend::PPRMProc(
    Movie theMovie,
    OSErr WXUNUSED_UNLESS_DEBUG(theErr),
    void* theRefCon)
{
    wxASSERT( theMovie );
    wxASSERT( theRefCon );
    wxASSERT( theErr == noErr );

    wxQTMediaBackend* pBE = (wxQTMediaBackend*) theRefCon;

    long lTime = ::GetMovieTime(theMovie,NULL);
    Fixed rate = ::GetMoviePreferredRate(theMovie);
    ::PrerollMovie(theMovie,lTime,rate);
    pBE->m_timer = new wxQTMediaLoadTimer(pBE);
    pBE->m_timer->Start(MOVIE_DELAY);
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::MCFilterProc (static)
//
// Callback for when the movie controller recieves a message
//---------------------------------------------------------------------------
pascal Boolean wxQTMediaBackend::MCFilterProc(
    MovieController WXUNUSED(theController),
    short action,
    void * WXUNUSED(params),
    long refCon)
{
    wxQTMediaBackend* pThis = (wxQTMediaBackend*)refCon;

    switch (action)
    {
    case 1:
        // don't process idle events
        break;

    case 8:
        // play button triggered - MC will set movie to opposite state
        // of current - playing ? paused : playing
        pThis->m_bPlaying = !(pThis->m_bPlaying);
        break;

    default:
        break;
    }

    return 0;
}

//---------------------------------------------------------------------------
// wxQTMediaBackend::WindowEventHandler [static]
//
// Event callback for the top level window of our control that passes
// messages to our moviecontroller so it can receive mouse clicks etc.
//---------------------------------------------------------------------------
pascal OSStatus wxQTMediaBackend::WindowEventHandler(
    EventHandlerCallRef inHandlerCallRef,
    EventRef inEvent,
    void *inUserData)
{
    wxQTMediaBackend* be = (wxQTMediaBackend*) inUserData;

    // Only process keyboard messages on this window if it actually
    // has focus, otherwise it will steal keystrokes from other windows!
    // As well as when it is not loaded properly as it
    // will crash in MCIsPlayerEvent
    if((GetEventClass(inEvent) == kEventClassKeyboard &&
        wxWindow::FindFocus() != be->m_ctrl)
        || !be->m_ctrl->m_bLoaded)
            return eventNotHandledErr;

    // Pass the event onto the movie controller
    EventRecord theEvent;
    ConvertEventRefToEventRecord( inEvent, &theEvent );
    OSStatus err;

    // TODO: Apple says MCIsPlayerEvent is depreciated and
    // MCClick, MCKey, MCIdle etc. should be used
    // (RN: Of course that's what they say about
    //  CreateMovieControl and HIMovieView as well, LOL!)
    err = ::MCIsPlayerEvent( be->m_mc, &theEvent );

    // Pass on to other event handlers if not handled- i.e. wx
    if (err != noErr)
        return noErr;
    else
        return eventNotHandledErr;
}

// in source file that contains stuff you don't directly use
#include "wx/html/forcelnk.h"
FORCE_LINK_ME(basewxmediabackends)

#endif // wxUSE_MEDIACTRL