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lualoader: Track the menu currently drawn, instead of validity

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This cleans up the odd approach to menu drawing. Instead of tracking
validity, we track the menu that was drawn on the screen. Whenever we draw a
menu, we'll set this to that menu.

Anything that invalidates the screen should go ahead and trigger an explicit
redraw, rather than finding a wy to set screen_invalid.

The currently drawn menu is then reset in menu.run as we exit the menu
system, so that dropping to the loader prompt or leaving menu.run() will
just behave as expected without doing redundant work every time we leave a
menu.
This commit is contained in:
Kyle Evans 2018-02-25 17:02:50 +00:00
parent fe226a72cb
commit beafe96147
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=329987
1 changed files with 9 additions and 15 deletions
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24
stand/lua/menu.lua
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@ -38,7 +38,7 @@ local drawer = require("drawer")
local menu = {}
local screen_invalid = true
local drawn_menu
local function OnOff(str, b)
if b then
@ -82,7 +82,6 @@ menu.handlers = {
end
end,
[core.MENU_SUBMENU] = function(_, entry)
screen_invalid = true
menu.process(entry.submenu)
end,
[core.MENU_RETURN] = function(_, entry)
@ -348,12 +347,12 @@ menu.default = menu.welcome
-- the local alias_table in menu.process.
menu.current_alias_table = {}
function menu.redraw(m)
-- redraw screen
function menu.draw(m)
-- Clear the screen, reset the cursor, then draw
screen.clear()
screen.defcursor()
menu.current_alias_table = drawer.drawscreen(m)
screen_invalid = false
drawn_menu = m
end
-- 'keypress' allows the caller to indicate that a key has been pressed that we
@ -361,10 +360,8 @@ end
function menu.process(m, keypress)
assert(m ~= nil)
-- Trigger a redraw if we've been invalidated. Otherwise, we assume
-- that this menu has already been drawn.
if screen_invalid then
menu.redraw(m)
if drawn_menu ~= m then
menu.draw(m)
end
while true do
@ -404,13 +401,9 @@ function menu.process(m, keypress)
end
-- If we got an alias key the screen is out of date...
-- redraw it.
menu.redraw(m)
menu.draw(m)
end
end
-- Invalidate the screen upon exit so that it gets redrawn upon
-- processing a new menu, assuming it won't be redrawn after leaving
-- this menu
screen_invalid = false
end
function menu.run()
@ -419,10 +412,11 @@ function menu.run()
return
end
menu.redraw(menu.default)
menu.draw(menu.default)
local autoboot_key = menu.autoboot()
menu.process(menu.default, autoboot_key)
drawn_menu = nil
screen.defcursor()
print("Exiting menu!")