broke selection movement within song into seperate routine, preparing for input to other parts of the UI

tracker.tal

@@ -1,5 +1,5 @@
 ( a blank file )
-( TODO fix ugly stack effects )
+( TODO selecting within patterns + basic editing )
 %+  { ADD }  %-  { SUB }  %*  { MUL }  %/  { DIV }
 %<  { LTH }  %>  { GTH }  %=  { EQU }  %!  { NEQ }
 %++ { ADD2 } %-- { SUB2 } %** { MUL2 } %// { DIV2 }
@@ -52,7 +52,10 @@
   &songpos $2 ( position in song table )
   
 @tracker
-  &selected-pattern $1
+  &selected-song-line $1
+  &selected-channel $1
+  &selected-col $1
+  &selected-pane $1 ( song pane = 00, patterns = 01 )
   
 ( program )
 
@@ -64,7 +67,7 @@
 	#0f25 .System/b DEO2
 
   ;module ;k-init-module/run JSR2
-    ;on-input .Controller/vector DEO2
+  ;on-input .Controller/vector DEO2
   ;redraw JSR2
 
 BRK
@@ -77,22 +80,36 @@ BRK
   #0080 .Screen/x DEO2
   ;get-selected-song-line-address JSR2 ;draw-patterns JSR2
   
-BRK
+RTN
 
 @on-input ( -> )
+  .tracker/selected-pane LDZ #00 EQU ,&song JCN
+  BRK
+  &song
+  ;move-song-selection JSR2
+BRK
+
+( moves the cursor in the song )
+@move-song-selection 
   .Controller/button DEI
   DUP #10 AND ,&up JCN
   #20 AND ,&down JCN
-  BRK
+  RTN
+  
   &up
-    .tracker/selected-pattern LDZ #01 SUB .tracker/selected-pattern STZ
+    POP
+    .tracker/selected-song-line LDZ #00 EQU ,&end JCN ( line 0 - don't move up )
+    .tracker/selected-song-line LDZ #01 SUB .tracker/selected-song-line STZ
     ,&end JMP
+  
   &down
-    .tracker/selected-pattern LDZ #01 ADD .tracker/selected-pattern STZ
+    .tracker/selected-song-line LDZ #01 ADD #00 SWP #0004 MUL2 ( selected song line offset )
+    .kalama/module LDZ2 #0003 ADD2 LDA2 ( song length ) EQU2 ,&end JCN ( if we're off the end of the song, don't move )
+    .tracker/selected-song-line LDZ #01 ADD .tracker/selected-song-line STZ
     ,&end JMP
   &end
     ;redraw JSR2
-BRK
+RTN
 
 @draw-patterns ( addr* )
   DUP2
@@ -109,7 +126,7 @@ BRK
 RTN
 
 @get-selected-song-line-address ( -- addr* )
-  .tracker/selected-pattern LDZ #00 SWP #0004 MUL2
+  .tracker/selected-song-line LDZ #00 SWP #0004 MUL2
   .kalama/module LDZ2 #0005 ADD2 ADD2
 RTN
 
@@ -179,7 +196,7 @@ RTN
   DUP #ff EQU ;&note-off JCN2
   DUP #00 EQU ;&blank JCN2 
   
-  DUP #0c MOD ( note minus octave )
+  DUP #0c MOD ( note without octave )
   #00 SWP #0002 MUL2
   ;&notes ADD2 LDA2 SWP
   #20 SUB #00 SWP #0008 MUL2 ;font ADD2 .Screen/addr DEO2 ( first note character )