/*
   * ReaScript Name: Open media item (type relative)
   * EEL script for Cockos REAPER
   * Author: EUGEN27771
   * Author URI: http://forum.cockos.com/member.php?u=50462
   * Licence: GPL v3
   * Version: 1.0
   */



// For MIDI  === Open MIDI-Item in MIDI-EDITOR with a FIXED VIEW(stable zoom in Project-Bars)
// For AUDIO === Open AUDIO-Item(Simply Toggle MAX/Normal Zoom & IT CAN BE CHANGED IF NEED)

// == Edit This Section For Set Zoom-Range, Start-View Point  etc == //
Zoom_In_Bars  = 4;        // Set Zoom_In_Bars for Zoom_Rang(for example 1,2,4 etc)
Add_Zoom_Out  = 0;        // Set Addenum Zoom_Out(ONLY IF NEED)(for example 0,1,2,3 etc)
Start_Zoom_Flag = 1;      // Set FLAG(Start-View Point) : 0=Cursor_Pos OR 1=Meas_Start(BAR start)
Audio_Action_ID = 41622;  // IT CAN BE CHANGED IF NEED, paste another ID From Action List(DefID=Toggle Zoom to Sel items)

// ================================================================= //   
PreventUIRefresh(1);
   Undo_BeginBlock();     // Start Undo(TOTAL FOR MIDI-Item & AUDIO-Items)
function Open_MIDI_and_Zoom()
(  
GetSet_LoopTimeRange(0,0,User_T_Sel_Start,User_T_Sel_End,0);         // Get-Save User Time Sel
Cursor_Pos_QN = TimeMap_timeToQN(GetCursorPosition());               // Get Cursor Pos(in Project QN)
TimeMap_QNToMeasures(0, Cursor_Pos_QN , Bar_Start_QN , Bar_End_QN ); // Get BAR Start-End in QN
One_Bar_QN = Bar_End_QN - Bar_Start_QN;                              // Calculate QN in Current Bar
Zoom_Range_QN = Zoom_In_Bars*One_Bar_QN;                             // Calculate Zoom_Range in QN(see Zoom_In_Bars) 
Start_Zoom_Flag ? Start_Zoom_QN = Bar_Start_QN : Start_Zoom_QN = Cursor_Pos_QN; // Set Start_Zoom Point(see Flag)
End_Zoom_QN = Start_Zoom_QN + Zoom_Range_QN;                                    // Calculate End_Zoom Point
Start_Zoom = TimeMap_QNToTime(Start_Zoom_QN);  // Start_Zoom_QN to Time
End_Zoom   = TimeMap_QNToTime(End_Zoom_QN);    // End_Zoom_QN to Time

GetSet_LoopTimeRange(1,0, Start_Zoom , End_Zoom , 0);   // Set Time Sel For Zoom
Main_OnCommand(40153, 0);                               // 40153 = open selected MIDI-Item in MIDI editor
ME = MIDIEditor_GetActive();                            // Get Active MIDI-EDITOR
MIDIEditor_OnCommand(ME, 40726);                        // Zoom to Zoom_Rang_Sel
loop(Add_Zoom_Out,MIDIEditor_OnCommand(ME, 1011););     // Zoom Out Horiz if Need(see Add_Zoom_Out)

GetSet_LoopTimeRange(1,0,User_T_Sel_Start,User_T_Sel_End,0); // Restore User Time Sel
   Undo_EndBlock("Open MIDI-Item + Zoom", -1);               // End Undo(Local-FOR MIDI ONLY)
); 

// ================================================================= // 
MediaItem = GetSelectedMediaItem(0, 0);          // Get 1-st selected media item
ActiveTake = GetActiveTake(MediaItem);           // Get Active Take
TakeIsMIDI(ActiveTake) ?                         // IF Take is MIDI,then exec Open_MIDI_and_Zoom(),else run Audio_Action
            Open_MIDI_and_Zoom() :
            (Main_OnCommand(Audio_Action_ID, 0);              // Action for AUDIO-Items(see Audio_Action_ID)
             Undo_EndBlock("Open Audio-Item + Zoom", -1);     // End Undo(Local-FOR Audio ONLY) 
             );
PreventUIRefresh(-1);