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https://github.com/a2-4am/4live.git
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refactor scrolling
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4am
parent
33436c0abc
commit
ae20c6049b
287
src/4live.a
287
src/4live.a
@ -151,7 +151,6 @@ Install
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+ sta (DOSBUFL), y
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dey
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bpl -
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sty ANIMATE + 1 ;enable visible screen-swapping via #$FF
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;open source file and read it if available
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@ -195,72 +194,135 @@ GetKey
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GlobalKeyboardHook
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;let DOS handle initial cursor
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jsr KEYIN
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;are we on?
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cmp #HOTKEY
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bne ReusableRTS1
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jsr ScrollEditScreenIn
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jsr EditorMode
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jsr ScrollEditScreenOut
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beq GetKey ;always
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ScrollEditScreenIn
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lda #HEIGHT
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sta LINE
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-- ldy #(WIDTH - 1)
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- lda $7D0, y
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sta LastLine, y
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dey
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bpl -
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jsr ScrollTextScreenDown
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ldy #(WIDTH - 1)
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- lda FirstLine, y
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sta $400, y
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dey
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bpl -
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jsr Delay
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dec LINE
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bne --
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ReusableRTS1
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rts
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ScrollEditScreenOut
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jsr SwapCoords
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;copy first line of physical screen to first line of virtual screen
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lda #HEIGHT
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sta LINE
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-- ldy #(WIDTH - 1)
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- lda $400, y
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sta FirstLine, y
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dey
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bpl -
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;scroll up physical screen
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jsr SCROLL
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;append line from virtual screen
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ldy #(WIDTH - 1)
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- lda LastLine, y
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sta $7D0, y
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dey
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bpl -
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;scroll down virtual screen
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jsr VirtScrollDown
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ANIMATE
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lda "Q" ;self-modified
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;yes -> branch
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beq +
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;animate it just for fun
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;no -> return to DOS
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rts
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+
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;first, scroll the edit buffer onto the screen
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;(this also swaps the current screen contents out so we can restore it later)
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jsr ScrollEditBufferIn
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;do the thing
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jsr EditorMode
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;scroll the edit buffer out and the original screen back in
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jsr ScrollEditBufferOut
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;save to disk
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jsr SaveFile
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;lather, rinse, repeat
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jmp GetKey
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ScrollEditBufferIn
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;save real cursor position and use saved edit buffer cursor position instead
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jsr SwapCoords
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lda #<StatusLine
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sta _in+1
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lda #>StatusLine
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sta _in+2
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lda #HEIGHT
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sta LINE
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;copy last line on screen to temporary buffer
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-- ldy #(WIDTH - 1)
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- lda $07D0, y
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sta LineBuffer, y
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dey
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bpl -
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;copy each line on screen down to next line (leaves top line untouched)
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jsr ScrollTextScreenDown
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;copy last line of edit buffer to top line on screen
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ldy #(WIDTH - 1)
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_in lda $FFFF, y ;self-modified above and below
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sta $0400, y
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dey
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bpl _in
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;copy temporary buffer to last line in edit buffer
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lda _in+1
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sta _in2+1
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lda _in+2
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sta _in2+2
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ldy #(WIDTH -1)
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- lda LineBuffer, y
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_in2 sta $FFFF, y ;self-modified above
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dey
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bpl -
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;animation delay
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jsr Delay
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;set up copy addresses for next line
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lda _in+1
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sec
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sbc #WIDTH
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sta _in+1
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bcs +
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dec _in+2
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+ dec LINE
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bne --
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rts
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ScrollEditBufferOut
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;restore real cursor position
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jsr SwapCoords
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lda #<EditBuffer
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sta _out+1
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lda #>EditBuffer
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sta _out+2
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lda #HEIGHT
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sta LINE
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;copy first line on screen to temporary buffer
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-- ldy #(WIDTH - 1)
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- lda $0400, y
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sta LineBuffer, y
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dey
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bpl -
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;copy each line on screen up to next line (leaves last line empty)
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jsr SCROLL
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;copy first line of edit buffer to bottom line of screen
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ldy #(WIDTH - 1)
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_out lda $FFFF, y ;self-modified above and below
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sta $07D0, y
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dey
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bpl _out
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;copy temporary buffer to first line in edit buffer
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lda _out+1
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sta _out2+1
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lda _out+2
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sta _out2+2
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ldy #(WIDTH - 1)
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- lda LineBuffer, y
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_out2 sta $FFFF, y ;self-modified above
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dey
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bpl -
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;animation delay
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jsr Delay
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;set up copy addresses for next line
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lda _out+1
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clc
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adc #WIDTH
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sta _out+1
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bcc +
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inc _out+2
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+ dec LINE
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bne --
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rts
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@ -284,40 +346,6 @@ _b sta $FFFF, y ; self-modified, above
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bpl -
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rts
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;scroll HEIGHT lines
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VirtScrollDown
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lda #<(LastLine - WIDTH)
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sta GBASL
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lda #>(LastLine - WIDTH)
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sta GBASH
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lda #<LastLine
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sta BAS2L
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lda #>LastLine
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sta BAS2H
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ldx #HEIGHT
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-- ldy #(WIDTH - 1)
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- lda (GBASL), y
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sta (BAS2L), y
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dey
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bpl -
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sec
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lda GBASL
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sbc #WIDTH
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sta GBASL
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bcs +
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dec GBASH
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sec
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+ lda BAS2L
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sbc #WIDTH
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sta BAS2L
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bcs +
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dec BAS2H
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+ dex
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bne --
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ReusableRTS2
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rts
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Delay
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lda #1
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jmp WAIT
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@ -336,33 +364,19 @@ SwapCoords
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bpl -
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jmp BASCALC
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;restore temporarily the original screen
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;so that notes are stored together
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SaveFile
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lda CH
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sta SaveCH
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lda CV
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sta SaveCV
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inc ANIMATE + 1 ;disable animation (was #$FF from above)
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jsr ScrollEditScreenOut
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jsr CreateWriteFile
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jsr ScrollEditScreenOut
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dec ANIMATE + 1 ;re-enable animation
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_doneEditorMode
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rts
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;print anything that isn't a special key
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;wrap around screen position when we hit edges
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EditorMode
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ldy CH
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lda (BASL), y
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jsr KEYIN
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cmp #HOTKEY
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beq ReusableRTS2
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beq _doneEditorMode
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cmp #ESC
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beq ReusableRTS2
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cmp #SAVEKEY
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beq SaveFile
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beq _doneEditorMode
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cmp #IMPORTKEY
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beq ImportScreen
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cmp #LTARROW
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@ -409,9 +423,9 @@ LineRight
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beq SetColumn ;always
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ImportScreen
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lda #<(FirstLine + WIDTH)
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lda #<(EditBuffer + WIDTH)
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sta OPSRCL
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lda #>(FirstLine + WIDTH)
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lda #>(EditBuffer + WIDTH)
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sta OPSRCH
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ldx #(HEIGHT - 2)
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@ -496,6 +510,11 @@ FileName
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OpenMLI_e
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rts
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SaveFile
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lda CH
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sta SaveCH
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lda CV
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sta SaveCV
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CreateWriteFile
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ldx #CREATEFILE
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jsr OpenCommon
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@ -555,13 +574,6 @@ MyCH
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MyCV
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!byte 0
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LoadSaveStart
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SaveCH
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!byte 0 ;loaded from file if exists
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SaveCV
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!byte 0 ;loaded from file if exists
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TextCalcHi
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!byte $04, $04, $05, $05, $06, $06, $07, $07
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!byte $04, $04, $05, $05, $06, $06, $07, $07
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@ -571,28 +583,21 @@ TextCalcLo
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!byte $28, $A8, $28, $A8, $28, $A8, $28, $A8
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!byte $50, $D0, $50, $D0, $50, $D0, $50, $D0
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FirstLine
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;pre-screen line to catch scroll
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!fill WIDTH, $A0
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LoadSaveStart
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;we reserve one line for status
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SaveCH
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!byte 0 ;loaded from file if exists
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SaveCV
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!byte 0 ;loaded from file if exists
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!scrxor $40, "CTRL"
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!text "+("
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!scrxor $40, IMPORTKEY
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!text ")"
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!scrxor $40, "MPORT"
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!text " ("
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!scrxor $40, SAVEKEY
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!text ")"
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!scrxor $40, "AVE"
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!text " "
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!scrxor $80, "4LIVE-1"
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;not the full $400 to save memory
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!fill WIDTH * (HEIGHT - 2), $A0
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LastLine
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!fill WIDTH, $A0
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EditBuffer ;lines are stored sequentially, not like text page in memory
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!fill WIDTH * (HEIGHT - 1), $A0
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LoadSaveEnd
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StatusLine ;must be exactly WIDTH bytes
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;status line
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!fill (WIDTH - 8), $20
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!scrxor $80, "4LIVE V1"
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LineBuffer ;used during scrolling
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!fill WIDTH, 0
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