feat: improved menu cursor navigation

- Left side of the empty menu screen is no longer a huge invisible back button. Instead, each parent menu can be clicked individually to navigate to it. Clicking empty space now correctly closes the menu.
- Submenus can now also be clicked to navigate to them.
- Moving cursor towards a submenu will not cause other items in current menu to be selected if cursor moves through them.

ref #217

scripts/uosc.lua

@@ -319,6 +319,8 @@ cursor = {
 	on_wheel_down = nil,
 	on_wheel_up = nil,
 	allow_dragging = false,
+	history = {}, -- {x, y}[] history
+	history_size = 10,
 	-- Called at the beginning of each render
 	reset_handlers = function()
 		cursor.on_primary_down, cursor.on_primary_up = nil, nil
@@ -355,6 +357,17 @@ cursor = {
 			cursor.autohide_timer:kill()
 			cursor.autohide_timer:resume()
 		end
+	end,
+	-- Calculates distance in which cursor reaches rectangle if it continues moving in the same path.
+	-- Returns `nil` if cursor is not moving towards the rectangle.
+	direction_to_rectangle_distance = function(rect)
+		if cursor.hidden or not cursor.history[1] then
+			return false
+		end
+
+		local prev_x, prev_y = cursor.history[1][1], cursor.history[1][2]
+		local end_x, end_y = cursor.x + (cursor.x - prev_x) * 1e10, cursor.y + (cursor.y - prev_y) * 1e10
+		return get_ray_to_rectangle_distance(cursor.x, cursor.y, end_x, end_y, rect)
 	end
 }
 state = {
@@ -541,18 +554,24 @@ function update_cursor_position(x, y)
 		else x, y = INFINITY, INFINITY end
 	end
 
-	-- add 0.5 to be in the middle of the pixel
+	-- Add 0.5 to be in the middle of the pixel
 	cursor.x, cursor.y = (x + 0.5) / display.scale_x, (y + 0.5) / display.scale_y
 
 	if old_x ~= cursor.x or old_y ~= cursor.y then
 		Elements:update_proximities()
 
 		if cursor.x == INFINITY or cursor.y == INFINITY then
-			cursor.hidden = true
+			cursor.hidden, cursor.history = true, {}
 			Elements:trigger('global_mouse_leave')
 		elseif cursor.hidden then
-			cursor.hidden = false
+			cursor.hidden, cursor.history = false, {}
 			Elements:trigger('global_mouse_enter')
+		else
+			-- Update cursor history
+			for i = 1, cursor.history_size - 1, 1 do
+				cursor.history[i] = cursor.history[i + 1]
+			end
+			cursor.history[cursor.history_size] = {x, y}
 		end
 
 		Elements:proximity_trigger('mouse_move')