im4ui.pxyl

im4ui.pyxl

let im4_items = []
let im4_order = 0
let im4_found_index = 0
let im4_search_label = ""
let im4_cursor_x = 16
let im4_selection = 0
let im4_iteration = 0
let im4_current_font = ∅ 
const im4_button_kind = 0
const im4_dropdown_kind = 1
const im4_checkbox_kind = 2
let im4_unselected_color = #8
let im4_selection_color = #FF0
let im4_selection_outline_color = #440

// im4__* indicates internal API
def im4__clear_item(i):
    i.a_order = 999
    return iterate.CONTINUE

def im4__compare(i):
    if equivalent(i.label, im4_search_label):
        i.a_order = im4_order
        im4_order += 1
        im4_found_index = 0
        return iterate.BREAK
    return iterate.CONTINUE
    
    
def im4__draw(i):
    if i.a_order == 999:
        return
    
    let color = #8
    let box_color = #4
    if im4_iteration == im4_selection:
        color = im4_selection_color
        box_color = im4_selection_outline_color
    else:
        color = im4_unselected_color
        box_color = im4_selection_outline_color

    let pos = xy(im4_cursor_x, 24)
    let sz = xy(0, 0)

    if i.kind == im4_checkbox_kind:
        if i.option:
            sz = draw_text({font: im4_current_font, text: "[X]", pos: pos, color: color, outline: box_color, x_align: "left", z: 999})
        else:
            sz = draw_text({font: im4_current_font, text: "[ ]", pos: pos, color: color, outline: box_color, x_align: "left", z: 999})
        if sz == ∅: 
            debug_print("WHAT CHECK")
            return
        
        pos.x += sz.x + 2

    let tsz = draw_text({font: im4_current_font, text: i.label, pos: pos, color: color, outline: box_color, x_align: "left", z: 999})

    // ocasionally draw_text returns ∅, haven't worked out why yet
    if tsz == ∅:
        debug_print("WHAT ", i.label)
        return
        
    sz.x += tsz.x
    sz.y += tsz.y

    if i.kind == im4_dropdown_kind:
        pos.x += sz.x + 2
        tsz = draw_text({font: im4_current_font, text: i.options[i.option], pos: pos, color: color, outline: box_color, x_align: "left", z: 999})
        sz.x += tsz.x
        sz.y += tsz.y

    im4_cursor_x += sz.x + 8
    im4_iteration += 1

//---- public interface

def im4_begin():
    im4_order = 0
    im4_cursor_x = 16
    iterate(im4_items, im4__clear_item)

def im4_font(font):
    im4_current_font = font

def im4_button(label, action):
    im4_found_index = 999
    im4_search_label = label
    iterate(im4_items, im4__compare)
    if im4_found_index == 999:
        let b = make_entity({ 
            a_order: im4_order, // a_order because sort keys off alphanumerically lowest member 
            action:action,
            kind:im4_button_kind,
            label:label })
        push(im4_items, b)
        im4_order += 1

def im4_checkbox(label, checked, action):
    im4_found_index = 999
    im4_search_label = label
    iterate(im4_items, im4__compare)
    if im4_found_index == 999:
        let b = make_entity({ 
            a_order: im4_order, // a_order because sort keys off alphanumerically lowest member 
            action:action,
            kind:im4_checkbox_kind,
            option: checked,
            label:label })
        push(im4_items, b)
        im4_order += 1

def im4_dropdown(label, options, action):
    im4_found_index = 999
    im4_search_label = label
    iterate(im4_items, im4__compare)
    if im4_found_index == 999:
        let b = make_entity({ 
            a_order: im4_order, // a_order because sort keys off alphanumerically lowest member 
            action:action,
            kind:im4_dropdown_kind,
            option:0,
            options:options,
            label:label })
        push(im4_items, b)
        im4_order += 1

    
def im4_end():
    sort(im4_items, "a_order", false)

def im4_set_inputs(left, right, action):
    if left:
        im4_selection -= 1
        debug_print("left", im4_selection)
    if right:
        im4_selection += 1
        debug_print("right", im4_selection)
    if im4_selection ≥ im4_order:
        im4_selection = im4_order - 1
    if im4_selection < 0:
        im4_selection = 0
    if action:
        debug_print("action", im4_selection)
        if im4_items[im4_selection].kind == im4_dropdown_kind:
            im4_items[im4_selection].option += 1
            if im4_items[im4_selection].option == size(im4_items[im4_selection].options):
                im4_items[im4_selection].option = 0
            im4_items[im4_selection].action(im4_items[im4_selection].option)
        else:
            if im4_items[im4_selection].kind == im4_checkbox_kind:
                im4_items[im4_selection].option = 1 - im4_items[im4_selection].option
                im4_items[im4_selection].action(im4_items[im4_selection].option)
            else:
                im4_items[im4_selection].action()

def im4_render():
    im4_iteration = 0
    iterate(im4_items, im4__draw)