mirror of
https://github.com/deater/dos33fsprogs.git
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96 lines
1.6 KiB
ArmAsm
96 lines
1.6 KiB
ArmAsm
;====================
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; hgr input
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;====================
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; TODO: save to string
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; TODO: arbitrary Y location
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; TODO: when backspacing, erase old char not XOR
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; INPUT_X points to next char
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; we print to chars to right
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hgr_input:
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ldx INPUT_ACTIVE
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bne input_currently_happening
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inc INPUT_ACTIVE ; make input active
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; current keypress in A
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pha
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; activate typing area
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jsr clear_bottom
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ldx #0
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ldy #184
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lda #'>'
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jsr hgr_put_char
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ldx #0 ; reset INPUT_X
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stx INPUT_X
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pla
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input_currently_happening:
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; check for backspace
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; actually DELETE (on Apple IIe) or ^B (II+)
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; we can't use backspace/^H as maps to left arrow
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; and the game assumes that means you want to walk left
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; this does mean it's hard to backspace on some emulators,
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; but that's an eternal challenge with Apple II emulators
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cmp #$7f ; check if DELETE (backspace)
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beq hgr_input_backspace
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cmp #2 ; ^B, option for Apple II+
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beq hgr_input_backspace
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ldx INPUT_X
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sta input_buffer,X ; store to buffer
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ldy #184 ; print char
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ldx INPUT_X
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inx ; print two to the right
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inx ; because of prompt
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jsr hgr_put_char
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ldx INPUT_X
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cpx #37
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bcs input_too_big ; FIXME this is a hack
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inc INPUT_X
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input_too_big:
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rts
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hgr_input_backspace:
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ldx INPUT_X
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beq done_backspace ; don't backspace too far
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dec INPUT_X
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ldx INPUT_X
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lda input_buffer,X ; load old char
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inx
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inx
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ldy #184
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jsr hgr_put_char ; xor it on top
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done_backspace:
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rts
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done_hgr_input:
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ldx INPUT_X ; NUL terminate
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lda #0
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sta INPUT_ACTIVE
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sta input_buffer,X
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rts
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input_buffer:
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.byte 0,0,0,0,0,0,0,0,0,0
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.byte 0,0,0,0,0,0,0,0,0,0
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.byte 0,0,0,0,0,0,0,0,0,0
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.byte 0,0,0,0,0,0,0,0,0,0
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