Show unavailable settings in menu (#16679)

builtin/common/settings/components.lua

@@ -45,9 +45,10 @@ local function is_valid_number(value)
 end
 
 
-function make.heading(text)
+function make.heading(text, info_text)
 	return {
 		full_width = true,
+		info_text = info_text,
 		get_formspec = function(self, avail_w)
 			return ("label[0,0.6;%s]box[0,0.9;%f,0.05;#ccc6]"):format(core.formspec_escape(text), avail_w), 1.2
 		end,
@@ -55,6 +56,22 @@ function make.heading(text)
 end
 
 
+function make.unavail_list(settings)
+	return {
+		full_width = true,
+		get_formspec = function(self, avail_w)
+			local h = 0.2
+			local fs = {}
+			for _, setting in ipairs(settings) do
+				fs[#fs + 1] = ("label[0.3,%f;%s]"):format(h,
+					core.colorize("#bbb", core.formspec_escape(get_label(setting))))
+				h = h + 0.4
+			end
+			return table.concat(fs, ""), h
+		end,
+	}
+end
+
 function make.note(text)
 	return {
 		full_width = true,

builtin/common/settings/dlg_settings.lua

@@ -137,6 +137,7 @@ local function load()
 
 	-- insert after "touch_controls"
 	table.insert(page_by_id.controls_touchscreen.content, 2, touchscreen_layout)
+
 	do
 		local content = page_by_id.graphics_and_audio_effects.content
 		local idx = table.indexof(content, "enable_dynamic_shadows")
@@ -407,18 +408,8 @@ function page_has_contents(page, actual_content)
 	for _, item in ipairs(actual_content) do
 		if item == false or item.heading then --luacheck: ignore
 			-- skip
-		elseif type(item) == "string" then
-			local setting = get_setting_info(item)
-			assert(setting, "Unknown setting: " .. item)
-			if check_requirements(setting.name, setting.requires, setting.context) then
-				return true
-			end
-		elseif item.get_formspec then
-			if check_requirements(item.id, item.requires, item.context) then
-				return true
-			end
 		else
-			error("Unknown content in page: " .. dump(item))
+			return true
 		end
 	end
 
@@ -429,6 +420,7 @@ end
 local function build_page_components(page)
 	-- Filter settings based on requirements
 	local content = {}
+	local settings_off = {}
 	local last_heading
 	for _, item in ipairs(page.content) do
 		if item == false then --luacheck: ignore
@@ -437,8 +429,9 @@ local function build_page_components(page)
 			last_heading = item
 		else
 			local name, requires, context
+			local setting
 			if type(item) == "string" then
-				local setting = get_setting_info(item)
+				setting = get_setting_info(item)
 				assert(setting, "Unknown setting: " .. item)
 				name = setting.name
 				requires = setting.requires
@@ -457,6 +450,8 @@ local function build_page_components(page)
 					last_heading = nil
 				end
 				content[#content + 1] = item
+			elseif setting then
+				settings_off[#settings_off + 1] = setting
 			end
 		end
 	end
@@ -475,6 +470,14 @@ local function build_page_components(page)
 			retval[i] = component_funcs.heading(item.heading)
 		end
 	end
+
+	if #settings_off > 0 then
+		retval[#retval + 1] = component_funcs.heading(fgettext_ne("Unavailable"),
+			-- luacheck: ignore
+			fgettext_ne("These settings are unavailable due to your platform, hardware or in combination with the current settings.")
+		)
+		retval[#retval + 1] = component_funcs.unavail_list(settings_off)
+	end
 	return retval
 end