[HELP] Whole text height

[Spc]

I am making help panel with scrollable dxText and I have a problem with calculating text height. I tried solutions from other topics but none of them works. Here's the code:

Texts: https://pastebin.com/VrdBF7ap

Categories data: https://pastebin.com/ZkUzUvuY

Panel code:

local sw, sh = guiGetScreenSize()
local open = false
local site

local renderTarget
local moveY = 0
local actualText
local maxScrolled

local category_font = dxCreateFont("font/Lato.ttf", 21)
local subcategory_font = dxCreateFont("font/Lato.ttf", 14)
local title_font = dxCreateFont("font/font.ttf", 14)
local text_font = dxCreateFont("font/Lato.ttf", 15)

function help_trigger()
	if open then
		open = false
		removeEventHandler("onClientRender", root, help_render)
		showChat(true)
		showPlayerHudComponent("all", true)
		showCursor(false)
	else
		if not CATEGORIES or not CATEGORIES[1] then return end
		open = true
		renderTarget = dxCreateRenderTarget(sw-270, sh-50, true) -- for text

		addEventHandler("onClientRender", root, help_render)
		showChat(false)
		showPlayerHudComponent("all", false)
		showCursor(t6rue)
	end
end
addCommandHandler("help", help_trigger, false)

function help_render()
	dxDrawRectangle(0, 0, sw, sh, tocolor(0,0,0,210))
	dxDrawRectangle(0, 30, 250, sh, tocolor(0,0,0,150))
	dxDrawRectangle(0, 0, sw, 30, tocolor(0,0,0,210))
	dxDrawText("Help panel", 0, 0, sw, 30, tocolor(255,255,255,255), 1, title_font, "center", "center")

	-- buttons
	local start_y = 50
	local offset = 0
	local button_height = 30
	for j, category in pairs(CATEGORIES) do
		dxDrawRectangle(0, start_y+offset, 7, button_height+10, tocolor(177, 177, 177, 255))
		dxDrawText(category.name, 15, start_y+offset, 250, start_y+offset+button_height+10, tocolor(177,177,177,255), 1, category_font, "left", "center")
		offset = offset + button_height+10 + 10

		for i, v in pairs(category.subcategories) do
			local color = {255,255,255}
			if site == j..":"..i or isMouseInPosition(0, start_y+offset, 250, button_height) then
				dxDrawRectangle(0, start_y+offset, 5, button_height, tocolor(0, 157, 255, 255))
				if isMouseInPosition(0, start_y+offset, 250, button_height) then 
					color = {0, 157, 255}
				end

				if getKeyState("mouse1") then -- if player click button
					site = j..":"..i
					moveY = 0
					actualText = getTextFromSite(site) or ""
					maxScrolled = (dxGetTextWidth(actualText, 1, text_font) / (sw-270)) * dxGetFontHeight(1, text_font)
				end
			end
			dxDrawText(v.name, 15, start_y+offset, 250, start_y+offset+button_height, tocolor(color[1], color[2], color[3], 255), 1, subcategory_font, "left", "center")
			offset = offset + button_height + 8
		end

		offset = offset + 10
	end

	-- main text
	if renderTarget then
		dxSetRenderTarget(renderTarget, true)
		dxDrawText(actualText or "", 0, moveY, sw-270, sh-50, tocolor(255,255,255,255), 1, text_font, "left", "top", true, true)
		dxSetRenderTarget()
		dxDrawImage(260, 40, sw-270, sh-50, renderTarget)
	end6
end

addEventHandler("onClientKey", root, function(btn, press)
	if press and open and site6 then
		if btn == "mouse_wheel_up" then
			if moveY < 0 then
				moveY = moveY + 30
			end
		elseif btn == "mouse_wheel_down" then
			if moveY > -maxScrolled then
				moveY = moveY - 30
			end
		end
	end
end)

----
function isMouseInPosition(x, y, width, height)
	if (not isCursorShowing()) then
		return false
	end
    local sx, sy = guiGetScreenSize()
    local cx, cy = getCursorPosition()
    local cx, cy = (cx * sx), (cy * sy)
    if (cx >= x and cx <= x + width ) and ( cy >= y and cy <= y + height) then
        return true
    else
        return false
    end
end

function getTextFromSite(site)
	local category, subcategory = unpack(split(site, ":"))
	if not category or not subcategory or category == "0" or subcategory == "0" then return false end
	return CATEGORIES[tonumber(category)].subcategories[tonumber(subcategory)].text
end

 

I need to calculate the whole text (saved in actualText) to maxScrolled variable. Is there any other ways to do this?