fox32rom/submenu.asm

255 lines
8.0 KiB
NASM

; submenu routines
; draw submenu items
; inputs:
; r0: pointer to menu bar root struct
; r1: selected root menu item
; r2: hovering submenu item (or 0xFFFFFFFF for none)
; outputs:
; none
draw_submenu_items:
push r0
push r1
push r2
push r3
push r4
push r5
push r6
push r7
push r8
push r29
push r30
push r31
; calculate the X position of the submenu
mov r31, r1 ; load number of the selected item into r31 for looping
mov r30, 16 ; X counter
cmp r31, 0 ; we don't need to loop if this is submenu 0
ifz jmp draw_submenu_items_calculate_x_skip
mov r4, r0
add r4, 5 ; point to start of root menu items text pointer
draw_submenu_items_calculate_x_loop:
mov r3, [r4] ; get pointer to text
movz.8 r3, [r3] ; get text length byte
add r3, 2 ; add 2 for the spaces on each side of the text
mul r3, 8 ; characters are 8 pixels wide
add r30, r3 ; add length to X counter
add r4, 8 ; point to next text pointer
loop draw_submenu_items_calculate_x_loop
draw_submenu_items_calculate_x_skip:
sub r30, 8 ; move the submenu to the left by 8 pixels
mov.16 [overlay_29_position_x], r30
mov r31, r0
inc r31 ; point to submenu list pointer
mul r1, 8 ; point to the selected submenu
add r31, r1
mov r0, [r31] ; load submenu list pointer
movz.8 r31, [r0] ; load number of submenu items
mov r30, r2 ; r30: number of the hovered item
mov r29, 0 ; counter of how many submenu items drawn so far
; calculate the required height for the submenu overlay
; multiply the number of submenu items by 16 (the font is 16 pixels tall)
mov r1, r31
mul r1, 16
mov.16 [overlay_29_height], r1
; calculate the required width for the submenu overlay
; multiply the width by 8 (the font is 8 pixels wide)
mov r1, r0
inc r1
movz.8 r1, [r1] ; load width of submenu
mov r8, r1 ; save the width in characters in r8 for later
mul r1, 8
mov.16 [overlay_29_width], r1
push r0
; set properties of overlay 29
mov.16 [overlay_29_position_y], 16
mov [overlay_29_framebuffer_ptr], overlay_29_framebuffer
mov r0, 0x8000001D ; overlay 29: position
mov.16 r1, [overlay_29_position_y]
sla r1, 16
mov.16 r1, [overlay_29_position_x]
out r0, r1
mov r0, 0x8000011D ; overlay 29: size
mov.16 r1, [overlay_29_height]
sla r1, 16
mov.16 r1, [overlay_29_width]
out r0, r1
mov r0, 0x8000021D ; overlay 29: framebuffer pointer
mov r1, [overlay_29_framebuffer_ptr]
out r0, r1
mov r0, 0x8000031D
out r0, 1
; draw empty submenu
mov r6, r31 ; outer loop counter
movz.8 r0, ' '
mov r1, 0
mov r2, 0
mov r3, 0xFF000000
mov r4, 0xFFFFFFFF
mov r5, 29
draw_empty_submenu_loop:
mov r7, r8 ; inner loop counter
cmp r30, r29
ifz mov r3, 0xFFFFFFFF ; foreground color: white
ifz mov r4, 0xFF000000 ; background color: black
ifnz mov r3, 0xFF000000 ; foreground color: black
ifnz mov r4, 0xFFFFFFFF ; background color: white
draw_empty_submenu_line_loop:
call draw_font_tile_to_overlay
add r1, 8
dec r7
ifnz jmp draw_empty_submenu_line_loop
mov r1, 0
add r2, 16
inc r29
dec r6
ifnz jmp draw_empty_submenu_loop
mov r29, 0 ; counter of how many submenu items drawn so far
pop r0
; draw submenu text
add r0, 3 ; point to start of submenu items text
mov r2, 0 ; Y = 0
draw_submenu_text_loop:
cmp r30, r29
ifz mov r3, 0xFFFFFFFF ; foreground color: white
ifz mov r4, 0xFF000000 ; background color: black
ifnz mov r3, 0xFF000000 ; foreground color: black
ifnz mov r4, 0xFFFFFFFF ; background color: white
mov r1, 0 ; X = 0
call draw_str_to_overlay ; draw submenu item text
mov r1, r0
dec r1 ; point to length byte of this menu item
movz.8 r1, [r1] ; load length byte
inc r1 ; add one to count the null-terminator
add r0, r1 ; add length to menu item text pointer
inc r0 ; increment past length byte
add r2, 16 ; add 16 to Y
inc r29
loop draw_submenu_text_loop
pop r31
pop r30
pop r29
pop r8
pop r7
pop r6
pop r5
pop r4
pop r3
pop r2
pop r1
pop r0
ret
; hide the submenu
; inputs:
; r0: pointer to menu bar root struct
; outputs:
; none
close_submenu:
push r1
; disable overlay 29
mov r1, 0x8000031D
out r1, 0
mov r1, 0xFFFFFFFF
call draw_menu_bar_root_items
pop r1
ret
; update the currently open submenu
; detects mouse movements over the submenu and handles clicks
; this should only be called if a submenu_update_event_type event is received
; inputs:
; *** these inputs should already be in the required registers from the event parameters ***
; r1: pointer to menu bar root struct
; r2: selected root menu item
; r3: hovering submenu item (or 0xFFFFFFFF for none)
; outputs:
; none
; the event is pushed back onto the event stack if the submenu is still open
submenu_update_event:
push r0
push r1
push r2
push r3
push r4
push r5
push r8
push r9
mov r8, r1 ; r8: pointer to menu bar root struct
mov r9, r2 ; r9: selected root menu item
mov r10, r3 ; r10: hovering submenu item (or 0xFFFFFFFF for none)
; get the current mouse position and check if the submenu overlay covers that position
; if the mouse is not in the submenu, then there is nothing to do
call get_mouse_position
mov r2, 29
call check_if_enabled_overlay_covers_position
ifnz jmp submenu_update_event_end_push
; make the mouse position relative to the submenu overlay
mov r2, 29
call make_coordinates_relative_to_overlay
; if the currently hovered item is different than the hovered item in the event parameters,
; then redraw the submenu with correct hovered item
div r1, 16 ; mouse Y / 16
cmp r1, r10 ; compare the currently hovered item to the hovered item in event parameter 2
ifz jmp submenu_update_event_no_redraw
mov r10, r1 ; set the hovering item to the currently hovering item
mov r2, r1
mov r1, r9
mov r0, r8
call draw_submenu_items
submenu_update_event_no_redraw:
; check the mouse held bit
; this is kinda hacky but it works
call get_mouse_button
bts r0, 1
ifnz jmp submenu_update_event_clicked
jmp submenu_update_event_end_push
submenu_update_event_clicked:
;div r2, 16 ; mouse Y / 16
mov r1, r8 ; event parameter 0: pointer to menu bar root struct
mov r2, r9 ; event parameter 1: selected root menu item
mov r3, r10 ; event parameter 2: selected submenu item
mov r4, 0
mov r5, 0
mov r0, submenu_click_event_type
call push_event
mov r0, r1
call close_submenu
jmp submenu_update_event_end_no_push
submenu_update_event_end_push:
; repush the submenu_update_event_type event to the event stack
mov r1, r8 ; event parameter 0: pointer to menu bar root struct
mov r2, r9 ; event parameter 1: selected root menu item
mov r3, r10 ; event parameter 2: hovering submenu item (or 0xFFFFFFFF for none)
mov r4, 0
mov r5, 0
mov r0, submenu_update_event_type
call push_event
submenu_update_event_end_no_push:
pop r9
pop r8
pop r5
pop r4
pop r3
pop r2
pop r1
pop r0
ret