NEW
  AUTO 3,1
				.LIST OFF
*--------------------------------------
SCRN.Init		>LDYAI 510+5+5+4+1		potentially 255*\\ NORM,INV,CEOL & \0
				>SYSCALL Getmem
				bcs .9
				>STYA LineBufPtr
				txa
				>STA.G hLineBuffer

				>LDA.G ScreenH
				dec
				>PUSHA
				>PUSHBI 1
				>LDYA L.SEQ.INIT
				>SYSCALL printf
				bcs .9

				lda #0

				ldy #FileX
				sta (pData),y

				ldy #FileY
				sta (pData),y
				iny
				sta (pData),y
		
				ldy #ScreenX
				sta (pData),y

				ldy #ScreenY
				sta (pData),y
				iny
				sta (pData),y

				jsr SCRN.UpdateTopBar
				bcs .9
				jsr SCRN.UpdateViewPort
				bcs .9
				jsr SCRN.UpdateMain
.9				rts
*--------------------------------------
SCRN.UpdateTopBar
				jsr SCRN.LineBufInit
				
				>PUSHBI 1
				>PUSHBI 1
				>PUSHBI 2
				>LDYA L.MSG.GOTOXY
				>SYSCALL printf
				bcs .9
				
				>LDA.G hFileName
				beq .1

				>SYSCALL GetMemPtr
				bra .2

.1				>LDYA L.MSG.NEWFILE

.2				>PUSHYA
				>PUSHBI 2
				>PUSHW L.MSG.TOPBAR
				>LDYA ZPPTR1
				>SYSCALL sprintf
				bcs .9
				
				>LDA.G bSaved
				bne .8
				
				ldy #255
				
.3				iny
				lda (ZPPTR1),y
				bne .3
				
				lda #"*"
				sta (ZPPTR1),y
				
				iny
				lda #0
				sta (ZPPTR1),y
				
.8				jmp SCRN.LineBufOutBar
.9				rts				
*--------------------------------------
SCRN.UpdateMain	>LDA.G ScreenY
				sta TmpIndex
				iny
				lda (pData),y
				sta TmpIndex+1

				lda #0
				sta TmpByte
				>LDA.G ViewPortH
				sta TmpCount

.1				lda TmpIndex
				ldx TmpIndex+1
				jsr BUF.GetLineAX		Y = line length
				bcs .5

				lda TmpByte
				jsr SCRN.UpdateLineAtALenY
				bcs SCRN.UpdateMain.9

.3				inc TmpByte
				inc TmpIndex
				bne .4

				inc TmpIndex+1
.4				dec TmpCount
				bne .1

				jmp SCRN.GotoCurXCurY

.5				ldx #0
				ldy TmpByte
				jsr SCRN.GotoXY
				bcs SCRN.UpdateMain.9

				>PUSHBI 0
				>LDYA L.SEQ.CEOL
				>SYSCALL printf
				bcs SCRN.UpdateMain.9

				inc TmpByte
				dec TmpCount
				bne .5

				jmp SCRN.GotoCurXCurY

SCRN.UpdateMain.9
				rts
*--------------------------------------
SCRN.UpdateCurrentLine
				>LDA.G ScreenY+1
				tax
				dey
				lda (pData),y
				clc
				>ADC.G CurY
				bcc .1
				inx
.1				jsr BUF.GetLineAX
				bcs SCRN.UpdateMain.9

				phy
				>LDA.G CurY
				ply
*--------------------------------------
* A = Target Screen Y position
* BufPtr = Text line start, Y = len
*--------------------------------------
SCRN.UpdateLineAtALenY
				stz bSelected
				sty TmpLen
				ldx #0
				tay
				jsr SCRN.GotoXY
				bcs SCRN.UpdateMain.9

				jsr SCRN.LineBufInit

				ldy #$ff
				
.10				iny
				lda SEQ.EDIT,y
				beq .11
				jsr SCRN.ToLineBuf
				bra .10
				
.11				ldy #0

				>LDA.G ScreenW
				tax
				>LDA.G ScreenX
				cmp TmpLen
				bcs .8

				tay
				clc
				adc BUF.LOffset
				sta BUF.COffset
				lda #0
				adc BUF.LOffset+1
				sta BUF.COffset+1

				tya
*				clc
				adc BufPtr
				sta BufPtr
				bcc .1
				inc BufPtr+1

.1				lda (BufPtr)
				beq .8

				cmp #C.CR
				beq .8

				jsr BUF.CheckSelected
				eor bSelected
				bpl .5

				jsr SCRN.ToggleSel

.5				lda (BufPtr)
				cmp #'\'
				beq .50
				cmp #'%'
				bne .51
				
.50				pha
				lda #'\'
				jsr SCRN.ToLineBuf
				pla
				
.51				jsr SCRN.ToLineBuf
				inc BufPtr
				bne .6
				inc BufPtr+1

.6				inc BUF.COffset
				bne .7
				inc BUF.COffset+1
.7				dex
				bne .1

.8				bit bSelected
				bpl .80
				jsr SCRN.ToggleSel

.80				lda #0
				jsr SCRN.ToLineBuf

				>PUSHBI 0
				>LDYA LineBufPtr
				>SYSCALL printf
.9				rts			
*--------------------------------------
SCRN.ToggleSel	ldy #0
				lda bSelected
				eor #$ff
				sta bSelected
				bpl .1

				ldy #6

.1				lda SEQ.NORM,y
				beq .8
				jsr SCRN.ToLineBuf
				iny
				bra .1

.8
SCRN.ToggleSel.RTS
				rts
*--------------------------------------
SCRN.UpdateStatusBar 
				jsr SCRN.LineBufInit

				>PUSHBI 1
				>PUSHB.G ScreenH
				>PUSHBI 2
				>LDYA L.MSG.GOTOXY
				>SYSCALL printf
				bcs SCRN.ToggleSel.RTS

				>LDA.G PromptMode
				bne .2

				>LDA.G FileY
				tax
				iny
				lda (pData),y
				inx
				bne .1

				inc

.1				>PUSHA
				txa
				>PUSHA
				>LDA.G FileX
				inc
				>PUSHA
				
				>PUSHW BUF.COffset
				>PUSHW BufLen

				>PUSHBI 7
				bra SCRN.UpdateStatusBarOut
*--------------------------------------
.2				eor #PromptModeHelp
				beq .3

				>PUSHW pData
				lda #2
.3				>PUSHA
				bra SCRN.UpdateStatusBarOut
*--------------------------------------
SCRN.UpdateStatusBarErrA
				>PUSHA
				>PUSHBI 1
				ldx #10
				bra SCRN.UpdateStatusBarOutErr
SCRN.UpdateStatusBarOut
				ldy #PromptMode
				lda (pData),y
				tax
SCRN.UpdateStatusBarOutErr
				>PUSHW L.MSG.STATUSBAR,x
				>LDYA ZPPTR1
				>SYSCALL sprintf
SCRN.LineBufOutBar
				>LDA.G ScreenW
				tax
				
				ldy #0
			
.1				lda (ZPPTR1),y
				beq .2
				iny
				dex
				bne .1

				bra .4
				
.2				lda #C.SPACE

.3				sta (ZPPTR1),y
				iny
				dex
				bne .3
				
				lda #0
				sta (ZPPTR1),y
				
.4				>PUSHW LineBufPtr
				>PUSHBI 2
				>LDYA L.SEQ.BAR
				>SYSCALL printf
				bcs .9

				jmp SCRN.GotoCurXCurY
.9				rts
*--------------------------------------
SCRN.CursorAdjust
.1				jsr BUF.ComputeCOffset
				bcc .8
				>DECW.G FileY
				>STZ.G FileX

				bra .1

.8				rts
*--------------------------------------
SCRN.LineBufInit
				>LDYA LineBufPtr
				>STYA ZPPTR1
				rts
*--------------------------------------
SCRN.ToLineBuf	sta (ZPPTR1)
				inc ZPPTR1
				bne .8
				inc ZPPTR1+1
.8				rts
*--------------------------------------
SCRN.GotoCurXCurY	
				ldy #CurX
				lda (pData),y
				tax
				ldy #CurY
				lda (pData),y
				tay

SCRN.GotoXY		txa
				inc
				>PUSHA
				tya
				inc
				inc
				>PUSHA
				>PUSHBI 2
				>LDYA L.MSG.GOTOXY
				>SYSCALL printf
SCRN.GotoXY.RTS	rts
*--------------------------------------
SCRN.UpdateViewPort	
				lda #$ff
				sta bNotRepaint

.1				ldy #FileX
				lda (pData),y
				ldy #ScreenX
				cmp (pData),y
				bcs .2					out of left border ?

				ldy #ScreenX			yes
				lda (pData),y
				dec
				sta (pData),y
				stz bNotRepaint
				bra .1

.2				clc
				ldy #ScreenX
				lda (pData),y
				ldy #ScreenW
				adc (pData),y
				dec
				ldy #FileX
				cmp (pData),y
				bcs .3					out of right border ?

				ldy #ScreenX
				lda (pData),y
				inc
				sta (pData),y
				stz bNotRepaint
				bra .2

.3				ldy #FileY+1
				lda (pData),y
				tax
				dey
				lda (pData),y			A,X = FileY
				ldy #ScreenY
				cmp (pData),y
				iny
				txa
				sbc (pData),y
				bcs .4					out of top border ?

				ldy #ScreenY			move viewport up one line....
				lda (pData),y
				sbc #0					CC from BCS
				sta (pData),y
				iny
				lda (pData),y
				sbc #0
				sta (pData),y
				bit bNotRepaint
				bpl .3

				jsr SCRN.scrollDn		...and move content one line down	
				bcs SCRN.GotoXY.RTS

.4				ldy #ScreenY+1
				lda (pData),y
				tax
				dey
				lda (pData),y
				ldy #ViewPortHm1
				clc
				adc (pData),y
				bcc .41

				inx

.41				ldy #FileY				A,X = screen bottom
				cmp (pData),y
				txa
				iny						FileY > screen bottom ? 
				sbc (pData),y
				bcs .5					CS : fileY>= screen bottom

*				clc						from BCS
				ldy #ScreenY			move viewport down one line....
				lda (pData),y
				adc #1
				sta (pData),y
				iny
				lda (pData),y
				adc #0
				sta (pData),y
				bit bNotRepaint
				bpl .4

				jsr SCRN.scrollUp		...and move content one line up		
				bcs .9
				bra .4 

.5				sec
				ldy #FileX
				lda (pData),y
				ldy #ScreenX
				sbc (pData),y
				ldy #CurX
				sta (pData),y
				sec
				ldy #FileY
				lda (pData),y
				ldy #ScreenY
				sbc (pData),y
				ldy #CurY
				sta (pData),y
				bit bNotRepaint
				bmi .6

				jsr SCRN.UpdateMain
				bcs .9

.6				jsr SCRN.UpdateStatusBar			
				bcs .9

				jmp SCRN.GotoCurXCurY
.9				rts
*--------------------------------------
SCRN.scrollUp	ldy #CurX
				lda (pData),y
				inc
				>PUSHA
				ldy #CurY
				lda (pData),y
				inc
				inc
				>PUSHA
				>PUSHBI 2
				>LDYA L.SEQ.SCROLLUP
				>SYSCALL printf
				bcs .9
				ldy #ScreenY+1
				lda (pData),y
				tax
				dey
				lda (pData),y
				clc
				ldy #ViewPortHm1
				adc (pData),y
				bcc .1
				inx
.1				jsr BUF.GetLineAX
				bcs .9
				ldy #ViewPortHm1
				lda (pData),y
				jmp SCRN.UpdateLineAtALenY

.9				rts
*--------------------------------------
SCRN.scrollDn	ldy #CurX
				lda (pData),y
				inc
				>PUSHA
				ldy #CurY
				lda (pData),y
				inc
				inc
				>PUSHA
				>PUSHBI 2
				>LDYA L.SEQ.SCROLLDN
				>SYSCALL printf
				bcs .9

				ldy #ScreenY+1
				lda (pData),y
				tax
				dey
				lda (pData),y
				jsr BUF.GetLineAX
				bcs .9
				lda #0
				jmp SCRN.UpdateLineAtALenY
.9				rts
*--------------------------------------
MAN
SAVE USR/SRC/BIN/EDIT.S.SCRN
LOAD USR/SRC/BIN/EDIT.S
ASM