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https://github.com/MikaylaFischler/cc-mek-scada.git
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284 lines
10 KiB
Lua
284 lines
10 KiB
Lua
-- Scroll-able List Box Display Graphics Element
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local tcd = require("scada-common.tcd")
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local core = require("graphics.core")
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local element = require("graphics.element")
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local CLICK_TYPE = core.events.CLICK_TYPE
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---@class listbox_args
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---@field scroll_height integer height of internal scrolling container (must fit all elements vertically tiled)
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---@field item_pad? integer spacing (lines) between items in the list (default 0)
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---@field nav_fg_bg? cpair foreground/background colors for scroll arrows and bar area
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---@field nav_active? cpair active colors for bar held down or arrow held down
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---@field parent graphics_element
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---@field id? string element id
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---@field x? integer 1 if omitted
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---@field y? integer auto incremented if omitted
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---@field width? integer parent width if omitted
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---@field height? integer parent height if omitted
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---@field gframe? graphics_frame frame instead of x/y/width/height
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---@field fg_bg? cpair foreground/background colors
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---@field hidden? boolean true to hide on initial draw
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---@class listbox_item
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---@field id string|integer element ID
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---@field e graphics_element element
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---@field y integer y position
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---@field h integer element height
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-- new listbox element
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---@nodiscard
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---@param args listbox_args
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---@return graphics_element element, element_id id
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local function listbox(args)
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-- create new graphics element base object
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local e = element.new(args)
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-- create content window for child elements
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local scroll_frame = window.create(e.window, 1, 1, e.frame.w - 1, args.scroll_height, false)
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e.content_window = scroll_frame
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-- item list and scroll management
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local list = {}
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local item_pad = args.item_pad or 0
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local scroll_offset = 0
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local content_height = 0
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local max_down_scroll = 0
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-- bar control/tracking variables
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local max_bar_height = e.frame.h - 2
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local bar_height = 0 -- full height of bar
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local bar_bounds = { 0, 0 } -- top and bottom of bar
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local bar_is_scaled = false -- if the scrollbar doesn't have a 1:1 ratio with lines
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local holding_bar = false -- bar is being held by mouse
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local bar_grip_pos = 0 -- where the bar was gripped by mouse down
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local mouse_last_y = 0 -- last reported y coordinate of drag
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-- draw scroll bar arrows, optionally showing one of them as pressed
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---@param pressed_arrow? 1|0|-1 arrow to show as pressed (1 = scroll up, 0 = neither, -1 = scroll down)
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local function draw_arrows(pressed_arrow)
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local nav_fg_bg = args.nav_fg_bg or e.fg_bg
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local active_fg_bg = args.nav_active or nav_fg_bg
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-- draw up/down arrows
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if pressed_arrow == 1 then
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e.w_set_fgd(active_fg_bg.fgd)
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e.w_set_bkg(active_fg_bg.bkg)
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e.w_set_cur(e.frame.w, 1)
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e.w_write("\x1e")
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e.w_set_fgd(nav_fg_bg.fgd)
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e.w_set_bkg(nav_fg_bg.bkg)
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e.w_set_cur(e.frame.w, e.frame.h)
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e.w_write("\x1f")
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elseif pressed_arrow == -1 then
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e.w_set_fgd(nav_fg_bg.fgd)
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e.w_set_bkg(nav_fg_bg.bkg)
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e.w_set_cur(e.frame.w, 1)
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e.w_write("\x1e")
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e.w_set_fgd(active_fg_bg.fgd)
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e.w_set_bkg(active_fg_bg.bkg)
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e.w_set_cur(e.frame.w, e.frame.h)
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e.w_write("\x1f")
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else
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e.w_set_fgd(nav_fg_bg.fgd)
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e.w_set_bkg(nav_fg_bg.bkg)
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e.w_set_cur(e.frame.w, 1)
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e.w_write("\x1e")
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e.w_set_cur(e.frame.w, e.frame.h)
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e.w_write("\x1f")
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end
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e.w_set_fgd(e.fg_bg.fgd)
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e.w_set_bkg(e.fg_bg.bkg)
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end
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-- render the scroll bar and re-cacluate height & bounds
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local function draw_bar()
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local offset = 2 + math.abs(scroll_offset)
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bar_height = math.min(max_bar_height + max_down_scroll, max_bar_height)
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if bar_height < 1 then
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bar_is_scaled = true
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-- can't do a 1:1 ratio
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-- use minimum size bar with scaled offset
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local scroll_progress = scroll_offset / max_down_scroll
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offset = 2 + math.floor(scroll_progress * (max_bar_height - 1))
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bar_height = 1
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else
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bar_is_scaled = false
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end
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bar_bounds = { offset, (bar_height + offset) - 1 }
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for i = 2, e.frame.h - 1 do
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if (i >= offset and i < (bar_height + offset)) and (bar_height ~= max_bar_height) then
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if args.nav_fg_bg ~= nil then
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e.w_set_bkg(args.nav_fg_bg.fgd)
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else
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e.w_set_bkg(e.fg_bg.fgd)
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end
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else
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if args.nav_fg_bg ~= nil then
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e.w_set_bkg(args.nav_fg_bg.bkg)
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else
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e.w_set_bkg(e.fg_bg.bkg)
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end
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end
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e.w_set_cur(e.frame.w, i)
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e.w_write(" ")
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end
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e.w_set_bkg(e.fg_bg.bkg)
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end
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-- update item y positions and move elements
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local function update_positions()
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local next_y = 1
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scroll_frame.setVisible(false)
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scroll_frame.setBackgroundColor(e.fg_bg.bkg)
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scroll_frame.setTextColor(e.fg_bg.fgd)
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scroll_frame.clear()
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for i = 1, #list do
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local item = list[i] ---@type listbox_item
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item.y = next_y
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next_y = next_y + item.h + item_pad
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item.e.reposition(1, item.y)
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item.e.show()
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end
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content_height = next_y
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max_down_scroll = math.min(-1 * (content_height - (e.frame.h + 1 + item_pad)), 0)
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if scroll_offset < max_down_scroll then scroll_offset = max_down_scroll end
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scroll_frame.reposition(1, 1 + scroll_offset)
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scroll_frame.setVisible(true)
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draw_bar()
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end
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-- determine where to scroll to based on a scrollbar being dragged without a 1:1 relationship
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---@param direction -1|1 negative 1 to scroll up by one, positive 1 to scroll down by one
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local function scaled_bar_scroll(direction)
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local scroll_progress = scroll_offset / max_down_scroll
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local bar_position = math.floor(scroll_progress * (max_bar_height - 1))
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-- check what moving the scroll bar up or down would mean for the scroll progress
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scroll_progress = (bar_position + direction) / (max_bar_height - 1)
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return math.max(math.floor(scroll_progress * max_down_scroll), max_down_scroll)
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end
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-- scroll down the list
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local function scroll_down(scaled)
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if scroll_offset > max_down_scroll then
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if scaled then
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scroll_offset = scaled_bar_scroll(1)
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else
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scroll_offset = scroll_offset - 1
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end
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update_positions()
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end
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end
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-- scroll up the list
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local function scroll_up(scaled)
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if scroll_offset < 0 then
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if scaled then
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scroll_offset = scaled_bar_scroll(-1)
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else
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scroll_offset = scroll_offset + 1
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end
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update_positions()
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end
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end
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-- handle a child element having been added to the list
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---@param id element_id element identifier
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---@param child graphics_element child element
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function e.on_added(id, child)
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table.insert(list, { id = id, e = child, y = 0, h = child.get_height() })
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update_positions()
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end
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-- handle a child element having been removed from the list
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---@param id element_id element identifier
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function e.on_removed(id)
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for idx, elem in ipairs(list) do
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if elem.id == id then
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table.remove(list, idx)
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update_positions()
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return
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end
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end
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end
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-- handle mouse interaction
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---@param event mouse_interaction mouse event
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function e.handle_mouse(event)
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if e.enabled then
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if event.type == CLICK_TYPE.TAP then
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if event.current.x == e.frame.w then
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if event.current.y == 1 or event.current.y < bar_bounds[1] then
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draw_arrows(1)
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scroll_up()
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if args.nav_active ~= nil then tcd.dispatch(0.25, function () draw_arrows(0) end) end
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elseif event.current.y == e.frame.h or event.current.y > bar_bounds[2] then
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draw_arrows(-1)
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scroll_down()
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if args.nav_active ~= nil then tcd.dispatch(0.25, function () draw_arrows(0) end) end
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end
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end
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elseif event.type == CLICK_TYPE.DOWN then
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if event.current.x == e.frame.w then
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if event.current.y == 1 or event.current.y < bar_bounds[1] then
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draw_arrows(1)
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scroll_up()
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elseif event.current.y == e.frame.h or event.current.y > bar_bounds[2] then
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draw_arrows(-1)
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scroll_down()
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else
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-- clicked on bar
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holding_bar = true
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bar_grip_pos = event.current.y - bar_bounds[1]
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mouse_last_y = event.current.y
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end
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end
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elseif event.type == CLICK_TYPE.UP then
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holding_bar = false
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draw_arrows(0)
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elseif event.type == CLICK_TYPE.DRAG then
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if holding_bar then
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-- if mouse is within vertical frame, including the grip point
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if event.current.y > (1 + bar_grip_pos) and event.current.y <= ((e.frame.h - bar_height) + bar_grip_pos) then
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if event.current.y < mouse_last_y then
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scroll_up(bar_is_scaled)
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elseif event.current.y > mouse_last_y then
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scroll_down(bar_is_scaled)
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end
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mouse_last_y = event.current.y
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end
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end
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elseif event.type == CLICK_TYPE.SCROLL_DOWN then
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scroll_down()
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elseif event.type == CLICK_TYPE.SCROLL_UP then
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scroll_up()
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end
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end
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end
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draw_arrows(0)
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draw_bar()
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return e.complete()
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end
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return listbox
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