我看到MPL的duplicate脚本也可以自动扩展区域，代码复制过来了，你看看他们是怎么做到的呢？
- -- @description Smart duplicate events
- -- [url=home.php?mod=space&uid=203026]@version[/url] 1.01
- -- @author MPL
- -- @website http://forum.cockos.com/showthread.php?t=188335
- -- @changelog
- -- # fix maxppq var miss
- -----------------------------------------------------------------------------------------
- function SmartDuplicateNotes()
- local ME = MIDIEditor_GetActive()
- if not ME then return end
- local take = MIDIEditor_GetTake(ME)
- if not take then return end
- local data = ParseRAWMIDI(take)
- local item = GetMediaItemTake_Item( take )
- local item_pos = GetMediaItemInfo_Value( item, 'D_POSITION')
- ret, ppq_shift = CalcShift(item, item_pos, take, data)
- if not ret then return end
- extendMIDI, noteoff_ppq = AddShiftedSelectedEvents(take, data, ppq_shift )
- if extendMIDI then
- local start_qn = TimeMap2_timeToQN( 0, item_pos )
- local end_qn = reaper.MIDI_GetProjQNFromPPQPos( take, noteoff_ppq )
- MIDI_SetItemExtents(item, start_qn, end_qn)
- end
- end
- -----------------------------------------------------------------------------------------
- function ParseRAWMIDI(take)
- local data = {}
- local gotAllOK, MIDIstring = MIDI_GetAllEvts(take, "")
- if not gotAllOK then return end
- local s_unpack = string.unpack
- local s_pack = string.pack
- local MIDIlen = MIDIstring:len()
- local idx = 0
- local offset, flags, msg1
- local ppq_pos = 0
- local nextPos, prevPos = 1, 1
- while nextPos <= MIDIlen do
-
- prevPos = nextPos
- offset, flags, msg1, nextPos = s_unpack("i4Bs4", MIDIstring, prevPos)
- idx = idx + 1
- ppq_pos = ppq_pos + offset
- data[idx] = {rawevt = s_pack("i4Bs4", offset, flags , msg1),
- offset=offset,
- flags=flags,
- selected =flags&1==1,
- muted =flags&2==2,
- msg1=msg1,
- ppq_pos = ppq_pos,
- isNoteOn =msg1:byte(1)>>4 == 0x9,
- isNoteOff =msg1:byte(1)>>4 == 0x8,
- isCC = msg1:byte(1)>>4 == 0xB,
- chan = 1+(msg1:byte(1)&0xF),
- vel=vel}
- end
- return data
- end
- -----------------------------------------------------------------------------------------
- function CalcShift(item, item_pos, take, data)
- local min_ppq, max_ppq
- for i =1, #data do
- if data[i].selected and not min_ppq then min_ppq = data[i].ppq_pos end
- if data[i].selected then max_ppq = data[i].ppq_pos end
- end
- if not max_ppq or not min_ppq then return end
- local ppq_dif = max_ppq - min_ppq
- local time_dif = MIDI_GetProjTimeFromPPQPos(take, ppq_dif) - item_pos
- local retval, measures, cml = TimeMap2_timeToBeats(0, time_dif)
- local time_of_measure = TimeMap2_beatsToTime(0, 0, 1)
- local measure_ppq = MIDI_GetPPQPosFromProjTime(take, time_of_measure+ item_pos)
- local ppq_shift = measure_ppq * (measures+1)
- return true, math.floor(ppq_shift)
- end
- -----------------------------------------------------------------------------------------
- function AddShiftedSelectedEvents(take, data, ppq_shift )
- local str = ''
- local last_ppq
- for i = 1, #data-1 do
- local flag
- if data[i].flags&1==1 then flag = data[i].flags-1 else flag = data[i].flags end
- local str_per_msg = string.pack("i4Bs4", data[i].offset, flag , data[i].msg1)
- str = str..str_per_msg
- last_ppq = data[i].ppq_pos
- end
-
- for i = 1, #data-1 do
- if data[i].selected then
- local new_ppq = data[i].ppq_pos + ppq_shift
- local str_per_msg = string.pack("i4Bs4", new_ppq-last_ppq, data[i].flags , data[i].msg1)
- str = str..str_per_msg
- last_ppq = new_ppq
- end
- end
-
- local noteoffoffs = data[#data].ppq_pos -last_ppq
- if data[#data].ppq_pos < last_ppq then noteoffoffs = 1 end
- str = str.. string.pack("i4Bs4", noteoffoffs, data[#data].flags , data[#data].msg1)
- MIDI_SetAllEvts(take, str)
-
- if data[#data].ppq_pos < last_ppq then return true, noteoffoffs + last_ppq end
- end
-
- -----------------------------------------------------------------------------------------
- function CheckFunctions(str_func)
- local SEfunc_path = reaper.GetResourcePath()..'/Scripts/MPL Scripts/Functions/mpl_Various_functions.lua'
- local f = io.open(SEfunc_path, 'r')
- if f then
- f:close()
- dofile(SEfunc_path)
-
- if not _G[str_func] then
- reaper.MB('Update '..SEfunc_path:gsub('%\\', '/')..' to newer version', '', 0)
- else
- Undo_BeginBlock2( 0 )
- SmartDuplicateNotes()
- Undo_EndBlock( 'Smart duplicate notes', -1 )
- end
- else
- reaper.MB(SEfunc_path:gsub('%\\', '/')..' missing', '', 0)
- end
- end
- --------------------------------------------------------------------
- CheckFunctions('SetFXName')
-
-
-
