Routines
Prev: ED93 Up: Map Next: EDDD
EDAA: Adjust Score Field Cursor
Used by the routine at Display_High_Score_Entry_Screen.
Adjusts the cursor within a score entry digit field. Searches for the current column position in the character table at IX via Search_Score_Entry_Table; if found and within range, updates E to the new column, calculates the attribute address via Calculate_Attr_Cell_Address, writes highlight attributes for both the old and new cursor positions via Highlight_Score_Entry_Row, then fills the column bytes for the updated field.
Input
B Entry count for table search
C Cursor colour byte
D Cursor upper bound
E Current cursor column
IX Score entry character table
Adjust_Score_Field_Cursor EDAA PUSH IX Copy the character table pointer from IX to HL.
EDAC POP HL
EDAD LD A,E Load the current cursor column from E.
EDAE PUSH BC Stash the field count on the stack and search for the current column in the table via Search_Score_Entry_Table.
EDAF CALL Search_Score_Entry_Table
EDB2 POP BC Restore the field count from the stack.
EDB3 RET NZ Return if the current position is not found in the table.
EDB4 INC HL Load the next cursor position from the table and check it against the upper bound in D.
EDB5 LD A,(HL)
EDB6 CP D
EDB7 RET Z Return if the cursor is already at its maximum.
EDB8 LD E,A Update the cursor column in E.
EDB9 INC HL Advance and load the screen position byte from the table entry.
EDBA LD A,(HL)
EDBB PUSH DE Stash the cursor state on the stack and calculate the new attribute cell address via Calculate_Attr_Cell_Address.
EDBC CALL Calculate_Attr_Cell_Address
EDBF POP DE Restore the cursor state from the stack.
EDC0 CALL Highlight_Score_Entry_Row Write the highlight attributes for the new cursor position via Highlight_Score_Entry_Row.
EDC3 PUSH IX Reload the character table pointer from IX to HL.
EDC5 POP HL
EDC6 INC HL Advance to the second table entry.
EDC7 LD A,D Load the upper bound from D and search for it in the table via Search_Score_Entry_Table.
EDC8 CALL Search_Score_Entry_Table
EDCB INC HL Advance and load the screen position byte from the table entry.
EDCC LD A,(HL)
EDCD PUSH DE Stash the cursor state on the stack and calculate the previous attribute cell address via Calculate_Attr_Cell_Address.
EDCE CALL Calculate_Attr_Cell_Address
EDD1 POP DE Restore the cursor state from the stack.
EDD2 INC HL Advance past the table position bytes.
EDD3 INC HL
EDD4 LD B,$1C Set the attribute fill count to 1C.
Score_Field_Fill_Loop EDD6 LD (HL),C Write the cursor colour to each attribute cell and loop until 1C cells are filled.
EDD7 INC HL
EDD8 DJNZ Score_Field_Fill_Loop
EDDA LD D,E Copy the updated cursor column from E to D.
EDDB XOR A Clear A and return to signal the field was updated.
EDDC RET
Prev: ED93 Up: Map Next: EDDD