自学教程：C++ GetNumTracks函数代码示例

int FindFirstUnusedGroup(){	bool grp[SNM_MAX_TRACK_GROUPS];	memset(grp, 0, sizeof(bool)*SNM_MAX_TRACK_GROUPS);	for (int i=0; i <= GetNumTracks(); i++) // incl. master	{		//JFB TODO? exclude selected tracks?		if (MediaTrack* tr = CSurf_TrackFromID(i, false))		{			SNM_ChunkParserPatcher p(tr);			WDL_FastString grpLine;			if (p.Parse(SNM_GET_SUBCHUNK_OR_LINE, 1, "TRACK", "GROUP_FLAGS", 0, 0, &grpLine, NULL, "TRACKHEIGHT"))			{				LineParser lp(false);				if (!lp.parse(grpLine.Get())) {					for (int j=1; j < lp.getnumtokens(); j++) { // skip 1st token GROUP_FLAGS						int val = lp.gettoken_int(j);						for (int k=0; k < SNM_MAX_TRACK_GROUPS; k++) {							int grpMask = int(pow(2.0, k*1.0));							grp[k] |= ((val & grpMask) == grpMask);						}					}				}			}		}	}	for (int i=0; i < SNM_MAX_TRACK_GROUPS; i++) 		if (!grp[i]) return i;	return -1;}

void TakeRandomCols(COMMAND_T* = NULL){	COLORREF cr;	// All black check	if (AllBlack())		return;	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		for (int j = 0; j < GetTrackNumMediaItems(tr); j++)		{			MediaItem* mi = GetTrackMediaItem(tr, j);			if (*(bool*)GetSetMediaItemInfo(mi, "B_UISEL", NULL))			{				for (int h = 0; h < CountTakes(mi); h++)				{					while (!(cr = g_custColors[rand() % 16]));					cr |= 0x1000000;					GetSetMediaItemTakeInfo(GetTake(mi, h), "I_CUSTOMCOLOR", &cr);				}			}		}	}	Undo_OnStateChange(__LOCALIZE("Set takes in selected item(s) to random custom color(s)","sws_undo"));	UpdateTimeline();}

void RemapMIDIInputChannel(COMMAND_T* _ct){	bool updated = false;	int ch = (int)_ct->user; // 0: source channel	char pLine[SNM_MAX_CHUNK_LINE_LENGTH] = "";	if (ch && _snprintfStrict(pLine, sizeof(pLine), "MIDI_INPUT_CHANMAP %d/n", ch-1) <= 0)		return;	for (int i=1; i <= GetNumTracks(); i++) // skip master	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (tr && *(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))		{			int in = *(int*)GetSetMediaTrackInfo(tr, "I_RECINPUT", NULL);			if ((in & 0x1000) == 0x1000) // midi in?			{				SNM_ChunkParserPatcher p(tr);				char currentCh[3] = "";				int chunkPos = p.Parse(SNM_GET_CHUNK_CHAR, 1, "TRACK", "MIDI_INPUT_CHANMAP", 0, 1, currentCh, NULL, "TRACKID");				if (chunkPos > 0) {					if (!ch || atoi(currentCh) != (ch-1))						updated |= p.ReplaceLine(--chunkPos, pLine); // pLine can be "", i.e. remove line				}				else					updated |= p.InsertAfterBefore(0, pLine, "TRACK", "TRACKHEIGHT", 1, 0, "TRACKID");			}		}	}	if (updated)		Undo_OnStateChangeEx2(NULL, SWS_CMD_SHORTNAME(_ct), UNDO_STATE_ALL, -1);}

// I_FOLDERDEPTH ://  0=normal, 1=track is a folder parent, // -1=track is the last in the innermost folder// -2=track is the last in the innermost and next-innermost folders, etcvoid SetTracksFolderState(COMMAND_T* _ct){	bool updated = false;	for (int i=1; i <= GetNumTracks(); i++) // skip master	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (tr && *(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))		{			int newState = (int)_ct->user;			int curState = *(int*)GetSetMediaTrackInfo(tr, "I_FOLDERDEPTH", NULL);			if ((int)_ct->user == -1) // last in folder?			{				if (SNM_GetTrackDepth(tr)>0)					newState = curState<0 ? curState-1 : -1;				else					newState = curState;			}			else if ((int)_ct->user == -2) // very last in folder?			{				int depth = SNM_GetTrackDepth(tr);				if (depth>0)					newState = depth * (-1);				else					newState = curState;			}			if (curState!=newState) {				GetSetMediaTrackInfo(tr, "I_FOLDERDEPTH", &newState);				updated = true;			}		}	}	if (updated)		Undo_OnStateChangeEx2(NULL, SWS_CMD_SHORTNAME(_ct), UNDO_STATE_ALL, -1);}

void SelPrevItem(COMMAND_T* ctx){	// Find the last selected	MediaItem* prevMi = NULL;	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (GetTrackVis(tr) & 2)		{			for (int j = 0; j < GetTrackNumMediaItems(tr); j++)			{				MediaItem* mi = GetTrackMediaItem(tr, j);				if (*(bool*)GetSetMediaItemInfo(mi, "B_UISEL", NULL))				{					if (prevMi)					{						if (ctx->user == 0)							Main_OnCommand(40289, 0); // Unselect all items						GetSetMediaItemInfo(prevMi, "B_UISEL", &g_bTrue);						UpdateTimeline();						return;					}				}				prevMi = mi;			}		}	}}

void RecSrcOut(COMMAND_T* = NULL){	// Set the rec source to output	// Set to mono or stereo based on first item	for (int i = 1; i <= GetNumTracks(); i++)	{		int iMode = 1; // 5 = mono, 1 = stereo		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))		{			if (GetTrackNumMediaItems(tr))			{				MediaItem* mi = GetTrackMediaItem(tr, 0);				if (GetMediaItemNumTakes(mi))				{					MediaItem_Take* mit = GetMediaItemTake(mi, 0);					PCM_source* p = (PCM_source*)GetSetMediaItemTakeInfo(mit, "P_SOURCE", NULL);					if (p && p->GetNumChannels() == 1)						iMode = 5;				}			}			GetSetMediaTrackInfo(tr, "I_RECMODE", &iMode);		}	}}

/* Return the last tap score of a row: the grade of the tap that completed * the row.  If the row has no tap notes, return -1.  If any tap notes aren't * graded (any tap is TNS_NONE) or are missed (TNS_MISS), return it. */int NoteDataWithScoring::LastTapNoteScoreTrack(unsigned row) const{	float scoretime = -9999;	int best_track = -1;	for( int t=0; t<GetNumTracks(); t++ )	{		/* Skip empty tracks and mines */		TapNote tn = GetTapNote(t, row);		if( tn.type == TapNote::empty || tn.type == TapNote::mine ) 			continue;		TapNoteScore tns = GetTapNoteScore(t, row);				if( tns == TNS_MISS || tns == TNS_NONE )			return t;		float tm = GetTapNoteOffset(t, row);		if(tm < scoretime) continue;				scoretime = tm;		best_track = t;	}	return best_track;}

int NoteDataWithScoring::GetNumNWithScore( TapNoteScore tns, int MinTaps, const float fStartBeat, float fEndBeat ) const{	if( fEndBeat == -1 )		fEndBeat = GetNumBeats();	int iStartIndex = BeatToNoteRow( fStartBeat );	int iEndIndex = BeatToNoteRow( fEndBeat );	iStartIndex = max( iStartIndex, 0 );	iEndIndex = min( iEndIndex, GetNumRows()-1 );	int iNumSuccessfulDoubles = 0;	for( int i=iStartIndex; i<=iEndIndex; i++ )	{		int iNumNotesThisIndex = 0;		TapNoteScore minTapNoteScore = TNS_MARVELOUS;		for( int t=0; t<GetNumTracks(); t++ )		{			switch( GetTapNote(t, i).type )			{			case TapNote::tap:					case TapNote::hold_head: 				iNumNotesThisIndex++;				minTapNoteScore = min( minTapNoteScore, GetTapNoteScore(t, i) );				break;			}		}		if( iNumNotesThisIndex >= MinTaps && minTapNoteScore >= tns )			iNumSuccessfulDoubles++;	}		return iNumSuccessfulDoubles;}

void CopyCutTrackGrouping(COMMAND_T* _ct){	int updates = 0;	bool copyDone = false;	g_trackGrpClipboard.Set(""); // reset "clipboard"	for (int i=0; i <= GetNumTracks(); i++) // incl. master	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (tr && *(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))		{			SNM_ChunkParserPatcher p(tr);			if (!copyDone)				copyDone = (p.Parse(SNM_GET_SUBCHUNK_OR_LINE, 1, "TRACK", "GROUP_FLAGS", 0, 0, &g_trackGrpClipboard, NULL, "MAINSEND") > 0);			// cut (for all selected tracks)			if ((int)_ct->user)				updates += p.RemoveLines("GROUP_FLAGS", true); // brutal removing ok: "GROUP_FLAGS" is not part of freeze data			// single copy: the 1st found track grouping			else if (copyDone)				break;		}	}	if (updates)		Undo_OnStateChangeEx2(NULL, SWS_CMD_SHORTNAME(_ct), UNDO_STATE_ALL, -1);}

void RestoreTracksFolderStates(COMMAND_T* _ct){	bool updated = false;	const char* strState = !_ct->user ? "I_FOLDERDEPTH" : "I_FOLDERCOMPACT";	WDL_PtrList_DeleteOnDestroy<SNM_TrackInt>* saveList = !_ct->user ? &g_trackFolderStates : &g_trackFolderCompactStates;	for (int i=1; i <= GetNumTracks(); i++) // skip master	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (tr && *(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))		{			for(int j=0; j < saveList->GetSize(); j++)			{				SNM_TrackInt* savedTF = saveList->Get(j);				int current = *(int*)GetSetMediaTrackInfo(tr, strState, NULL);				if (savedTF->m_tr == tr && 					((!_ct->user && savedTF->m_int != current) ||					(_ct->user && *(int*)GetSetMediaTrackInfo(tr, "I_FOLDERDEPTH", NULL) == 1 && savedTF->m_int != current)))				{					GetSetMediaTrackInfo(tr, strState, &(savedTF->m_int));					updated = true;					break;				}			}		}	}	if (updated)		Undo_OnStateChangeEx2(NULL, SWS_CMD_SHORTNAME(_ct), UNDO_STATE_ALL, -1);}

void ColorChildren(COMMAND_T* = NULL){	int iParentDepth;	COLORREF crParentColor;	bool bSelected = false;	MediaTrack* gfd = NULL;	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		int iType;		int iFolder = GetFolderDepth(tr, &iType, &gfd);		if (bSelected)			GetSetMediaTrackInfo(tr, "I_CUSTOMCOLOR", &crParentColor);		if (iType == 1)		{			if (!bSelected && *(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			{				iParentDepth = iFolder;				bSelected = true;			}			crParentColor = *(COLORREF*)GetSetMediaTrackInfo(tr, "I_CUSTOMCOLOR", NULL);		}		if (iType + iFolder <= iParentDepth)			bSelected = false;	}	Undo_OnStateChangeEx(__LOCALIZE("Set track(s) children to same color","sws_undo"), UNDO_STATE_TRACKCFG, -1);}

void SelItems::Restore(MediaTrack* tr){	bool* bUsed = NULL;	if (m_selItems.GetSize())	{		bUsed = new bool[m_selItems.GetSize()];		memset(bUsed, 0, sizeof(bool) * m_selItems.GetSize());	}	if (tr == NULL)	{		PreventUIRefresh(1);		for (int i = 1; i <= GetNumTracks(); i++)			Match(CSurf_TrackFromID(i, false), bUsed);		PreventUIRefresh(-1);	}	else		Match(tr, bUsed);	// Delete unused items	for (int i = m_selItems.GetSize()-1; i >= 0 ; i--)		if (!bUsed[i])			m_selItems.Delete(i, true);	delete[] bUsed;}

void SelULItem(COMMAND_T* = NULL){	UnselOnTracks();	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		int iNumItems = GetTrackNumMediaItems(tr);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL) && iNumItems)		{			MediaItem* pUL = GetTrackMediaItem(tr, 0);			double dFirstPos = *(double*)GetSetMediaItemInfo(pUL, "D_POSITION", NULL);			float fFIPMy = *(float*)GetSetMediaItemInfo(pUL, "F_FREEMODE_Y", NULL);			for (int j = 1; j < iNumItems; j++)			{				if (dFirstPos != *(double*)GetSetMediaItemInfo(GetTrackMediaItem(tr, j), "D_POSITION", NULL))					break;				if (fFIPMy > *(float*)GetSetMediaItemInfo(GetTrackMediaItem(tr, j), "F_FREEMODE_Y", NULL))				{					pUL = GetTrackMediaItem(tr, j);					fFIPMy = *(float*)GetSetMediaItemInfo(pUL, "F_FREEMODE_Y", NULL);				}			}			GetSetMediaItemInfo(pUL, "B_UISEL", &g_bTrue);		}	}	UpdateTimeline();}

void ToggleWriteEnvExists(COMMAND_T* _ct){	bool updated = false;	// restore write modes	if (g_toolbarAutoModeToggles.GetSize())	{		for (int i=0; i < g_toolbarAutoModeToggles.GetSize(); i++)		{			SNM_TrackInt* tri = g_toolbarAutoModeToggles.Get(i);			GetSetMediaTrackInfo(tri->m_tr, "I_AUTOMODE", &(tri->m_int));			updated = true;		}		g_toolbarAutoModeToggles.Empty(true);	}	// set read mode and store previous write modes	else	{		for (int i=0; i <= GetNumTracks(); i++) // incl. master		{			MediaTrack* tr = CSurf_TrackFromID(i, false); 			int autoMode = tr ? *(int*)GetSetMediaTrackInfo(tr, "I_AUTOMODE", NULL) : -1;			if (autoMode >= 2 /* touch */ && autoMode <= 4 /* latch */)			{				GetSetMediaTrackInfo(tr, "I_AUTOMODE", &g_i1); // set read mode				g_toolbarAutoModeToggles.Add(new SNM_TrackInt(tr, autoMode));				updated = true;			}		}	}	if (updated) {		Undo_OnStateChangeEx2(NULL, SWS_CMD_SHORTNAME(_ct), UNDO_STATE_ALL, -1);		RefreshToolbar(SWSGetCommandID(ToggleWriteEnvExists)); // in case auto-refresh toolbar option is off..	}}

int CheckTrackParam(COMMAND_T* ct){	int iNumTracks = GetNumTracks();	for (int i = 1; i <= iNumTracks; i++)		if (GetMediaTrackInfo_Value(CSurf_TrackFromID(i, false), (const char*)ct->user) != 0.0)			return true;	return false;}

void HideAll(COMMAND_T* = NULL){	for (int i = 1; i <= GetNumTracks(); i++)		SetTrackVis(CSurf_TrackFromID(i, false), 0);	TrackList_AdjustWindows(MAJORADJUST);	UpdateTimeline();	Undo_OnStateChangeEx(__LOCALIZE("Hide all tracks","sws_undo"), UNDO_STATE_TRACKCFG, -1);}

void ToggleArmTrackEnv(COMMAND_T* _ct){	bool updated = false;	for (int i=0; i <= GetNumTracks(); i++) // incl. master	{		MediaTrack* tr = CSurf_TrackFromID(i, false); 		if (tr && *(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))		{			SNM_ArmEnvParserPatcher p(tr);			switch(_ct->user)			{				// all envs				case 0:					p.SetNewValue(-1);//toggle					updated = (p.ParsePatch(-1) > 0);					break;				case 1:					p.SetNewValue(1);//arm					updated = (p.ParsePatch(-1) > 0); 					break;				case 2:					p.SetNewValue(0); //disarm					updated = (p.ParsePatch(-1) > 0);					break;				// track vol/pan/mute envs				case 3:					updated = (p.ParsePatch(SNM_TOGGLE_CHUNK_INT, 2, "VOLENV2", "ARM", 0, 1) > 0);					break;				case 4:					updated = (p.ParsePatch(SNM_TOGGLE_CHUNK_INT, 2, "PANENV2", "ARM", 0, 1) > 0);					break;				case 5:					updated = (p.ParsePatch(SNM_TOGGLE_CHUNK_INT, 2, "MUTEENV", "ARM", 0, 1) > 0);					break;				// receive envs				case 6:					p.SetNewValue(-1); //toggle					updated = (p.ParsePatch(-2) > 0);					break;				case 7:					p.SetNewValue(-1); //toggle					updated = (p.ParsePatch(-3) > 0);					break;				case 8:					p.SetNewValue(-1); //toggle					updated = (p.ParsePatch(-4) > 0);					break;				// plugin envs				case 9:					p.SetNewValue(-1); //toggle					updated = (p.ParsePatch(-5) > 0);					break;			}		}	}	if (updated)		Undo_OnStateChangeEx2(NULL, SWS_CMD_SHORTNAME(_ct), UNDO_STATE_ALL, -1);}

/* See NoteData::GetNumHands(). */int NoteDataWithScoring::GetSuccessfulHands( float fStartBeat, float fEndBeat ) const{	if( fEndBeat == -1 )		fEndBeat = GetNumBeats();	int iStartIndex = BeatToNoteRow( fStartBeat );	int iEndIndex = BeatToNoteRow( fEndBeat );	/* Clamp to known-good ranges. */	iStartIndex = max( iStartIndex, 0 );	iEndIndex = min( iEndIndex, GetNumRows()-1 );	int iNum = 0;	for( int i=iStartIndex; i<=iEndIndex; i++ )	{		if( !RowNeedsHands(i) )			continue;		bool Missed = false;		for( int t=0; t<GetNumTracks(); t++ )		{			TapNote tn = GetTapNoteX(t, i);			if( tn.type == TapNote::empty )				continue;			if( tn.type == TapNote::mine ) // mines don't count				continue;			if( GetTapNoteScore(t, i) <= TNS_BOO )				Missed = true;		}		if( Missed )			continue;		/* Check hold scores. */		for( int j=0; j<GetNumHoldNotes(); j++ )		{			const HoldNote &hn = GetHoldNote(j);			HoldNoteResult hnr = GetHoldNoteResult( hn );			/* Check if the row we're checking is in range. */			if( !hn.RowIsInRange(i) )				continue;			/* If a hold is released *after* a hands containing it, the hands is			 * still good.  So, ignore the judgement and only examine iLastHeldRow			 * to be sure that the hold was still held at the point of this row.			 * (Note that if the hold head tap was missed, then iLastHeldRow == i			 * and this won't fail--but the tap check above will have already failed.) */			if( hnr.iLastHeldRow < i )				Missed = true;		}		if( !Missed )			iNum++;	}	return iNum;}

void UnbypassFX(COMMAND_T* = NULL){	for (int i = 0; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			GetSetMediaTrackInfo(tr, "I_FXEN", &g_i1);	}}

void SelItems::Save(MediaTrack* tr){	m_selItems.Empty(true);	if (tr == NULL)		for (int i = 1; i <= GetNumTracks(); i++)			Add(CSurf_TrackFromID(i, false));	else		Add(tr);}

MediaTrack* GuidToTrack(const GUID* guid){	if (guid)		for (int i=0; i<=GetNumTracks(); i++)			if (MediaTrack* tr = CSurf_TrackFromID(i, false))				if (TrackMatchesGuid(tr, guid))					return tr;	return NULL;}

void DisableMPSend(COMMAND_T* = NULL){	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			GetSetMediaTrackInfo(tr, "B_MAINSEND", &g_bFalse);	}}

void UnsetMonMedia(COMMAND_T* = NULL){	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			GetSetMediaTrackInfo(tr, "I_RECMONITEMS", &g_i0);	}}

int SNM_GetTrackDepth(MediaTrack* _tr){	int depth = 0;	for (int i=1; i <= GetNumTracks(); i++) // skip master		if (MediaTrack* tr = CSurf_TrackFromID(i, false)) {			depth += *(int*)GetSetMediaTrackInfo(tr, "I_FOLDERDEPTH", NULL);			if (_tr==tr) return depth;		}	return depth;}

MediaTrack* GetFirstSelectedTrack(){	for (int j = 0; j <= GetNumTracks(); j++)	{		MediaTrack* tr = CSurf_TrackFromID(j, false);		if (tr && *(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			return tr;	}	return NULL;}

// native assumption: only 1 env selected at a time (v4.13)MediaTrack* GetTrackWithSelEnv(){	if (TrackEnvelope* env = GetSelectedTrackEnvelope(NULL))		for (int i=0; i <= GetNumTracks(); i++) // incl. master			if (MediaTrack* tr = CSurf_TrackFromID(i, false))				for (int j=0; j < CountTrackEnvelopes(tr); j++)					if (env == GetTrackEnvelope(tr, j))						return tr;	return NULL;}

void ColorTrackNext(COMMAND_T* = NULL){	for (int i = 0; i < GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			GetSetMediaTrackInfo(tr, "I_CUSTOMCOLOR", GetSetMediaTrackInfo(CSurf_TrackFromID(i+1, false), "I_CUSTOMCOLOR", NULL));	}	Undo_OnStateChangeEx(__LOCALIZE("Set track(s) to previous track's color","sws_undo"), UNDO_STATE_TRACKCFG, -1);}

void MuteRecvs(COMMAND_T* = NULL){	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			for (int j = 0; GetSetTrackSendInfo(tr, -1, j, "P_SRCTRACK", NULL); j++)				GetSetTrackSendInfo(tr, -1, j, "B_MUTE", &g_bTrue);	}}

void UnmuteSends(COMMAND_T* = NULL){	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		if (*(int*)GetSetMediaTrackInfo(tr, "I_SELECTED", NULL))			for (int j = 0; GetSetTrackSendInfo(tr, 0, j, "P_DESTTRACK", NULL); j++)				GetSetTrackSendInfo(tr, 0, j, "B_MUTE", &g_bFalse);	}}

bool FilteredVisState::UpdateReaper(bool bHideFiltered){	bool bChanged = false;	// Remove tracks from filteredOut that aren't in the project	for (int i = 0; i < m_filteredOut.GetSize(); i++)		if (CSurf_TrackToID(m_filteredOut.Get(i)->tr, false) <= 0)			m_filteredOut.Delete(i--, true);	for (int i = 1; i <= GetNumTracks(); i++)	{		MediaTrack* tr = CSurf_TrackFromID(i, false);		int iVis = GetTrackVis(tr);		int iNewVis = iVis;		bool bShow = !bHideFiltered || MatchesFilter(tr);		// Is this track in the filteredOut list?		int j;		for (j = 0; j < m_filteredOut.GetSize(); j++)			if (m_filteredOut.Get(j)->tr == tr)				break;				if (j < m_filteredOut.GetSize())		{			if (bShow)			{				iNewVis = m_filteredOut.Get(j)->iVis;				m_filteredOut.Delete(j, true);			}			else				iNewVis = 0;		}		else if (!bShow)		{			iNewVis = 0;			TrackVisState* tvs = m_filteredOut.Add(new TrackVisState);			tvs->tr = tr;			tvs->iVis = iVis;		}		if (iVis != iNewVis)		{			SetTrackVis(tr, iNewVis);			bChanged = true;		}	}	if (bChanged)	{		TrackList_AdjustWindows(false);		UpdateTimeline();	}	return bChanged;}