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Offline blfngl

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Trouble with screen managers?
« on: September 09, 2012, 05:47:24 pm »
Hello,
I keep getting an error when typing:
Screen = class()

Then oclua returns the error:
[string "screen = class()..."]:3: attempt to index global 'Screen' (a nil value)

Any tips?

This is the code:
Code: [Select]
Screen = class()
 
function Screen:init() end
 
function Screen:paint(gc) end
function Screen:timer() end
function Screen:charIn(ch) end
function Screen:arrowKey(key) end
function Screen:escapeKey() end
function Screen:enterKey() end
function Screen:tabKey() end
function Screen:contextMenu() end
function Screen:backtabKey() end
function Screen:backspaceKey() end
function Screen:clearKey() end
function Screen:mouseMove(x, y) end
function Screen:mouseDown(x, y) end
function Screen:mouseUp() end
function Screen:rightMouseDown(x, y) end
function Screen:help() end
 
local Screens = {}
 
function PushScreen(screen)
    table.insert(Screens, screen)
    platform.window:invalidate()
end
 
function PullScreen()
    if #Screens > 0 then
        table.remove(Screens)
        platform.window:invalidate()
    end
end
 
function activeScreen()
    return Screens[#Screens] and Screens[#Screens] or Screen
end
 
-- Link events to ScreenManager
function on.paint(gc)
   for _, screen in pairs(Screens) do
        screen:paint(gc)
    end
end
 
function on.timer()
    for _, screen in pairs(Screens) do
        screen:timer()
    end
end
 
function on.charIn(ch) activeScreen():charIn(ch) end
function on.arrowKey(key) activeScreen():arrowKey(key) end
function on.escapeKey() activeScreen():escapeKey() end
function on.enterKey() activeScreen():enterKey() end
function on.tabKey() activeScreen():tabKey() end
function on.contextMenu() activeScreen():contextMenu() end
function on.backtabKey() activeScreen():backtabKey() end
function on.backspaceKey() activeScreen():backspaceKey() end
function on.clearKey() activeScreen():clearKey() end
function on.mouseDown(x, y) activeScreen():mouseDown(x, y) end
function on.mouseUp() activeScreen():mouseUp() end
function on.mouseMove(x, y) activeScreen():mouseMove(x, y) end
function on.rightMouseDown(x, y) activeScreen():rightMouseDown(x, y) end
function on.help() activeScreen():help() end
 
function on.create() PushScreen(Menu()) end
function on.resize() end
I tried making my own and it didn't work, so then I copied the inspired-lua code but got the same error.
« Last Edit: September 09, 2012, 07:32:39 pm by blfngl »
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Offline ExtendeD

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Re: Trouble with screen managers?
« Reply #1 on: September 12, 2012, 04:24:22 pm »
Did you try to just run "Screen = class()" alone?
I don't have any problem with it, whether using OS v3.1 or v3.2, Luna or oclua.
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Offline blfngl

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Re: Trouble with screen managers?
« Reply #2 on: September 12, 2012, 06:58:43 pm »
What do you mean running screen = class() alone :P? I'm kinda new to lua and I'm using os 3.1 with oclua, but I have luna.
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Offline Adriweb

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Re: Trouble with screen managers?
« Reply #3 on: September 14, 2012, 02:19:07 am »
just one line with "Screen = class()", to see if that works for you already.
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Offline blfngl

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Re: Trouble with screen managers?
« Reply #4 on: September 14, 2012, 08:12:33 am »
Screen = class() is working fine, but how do I add my own menu and stuff? When I used my own code it wouldn't work, and the one I copied off of inspired-lua (the A-Z tutorials) didn't work...am I doing something wrong? The exact code is in the first post.
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Offline Adriweb

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Re: Trouble with screen managers?
« Reply #5 on: September 14, 2012, 10:01:52 am »
The code you posted works just fine for me (the only error being the undefined Menu, which is normal since you have to do it).

Anyway, try something like this :

Code: [Select]
Screen = class()
 
function Screen:init() end
 
function Screen:paint(gc) end
function Screen:timer() end
function Screen:charIn(ch) end
function Screen:arrowKey(key) end
function Screen:escapeKey() end
function Screen:enterKey() end
function Screen:tabKey() end
function Screen:contextMenu() end
function Screen:backtabKey() end
function Screen:backspaceKey() end
function Screen:clearKey() end
function Screen:mouseMove(x, y) end
function Screen:mouseDown(x, y) end
function Screen:mouseUp() end
function Screen:rightMouseDown(x, y) end
function Screen:help() end
 
local Screens = {}
 
function PushScreen(screen)
    table.insert(Screens, screen)
    platform.window:invalidate()
end
 
function PullScreen()
    if #Screens > 0 then
        table.remove(Screens)
        platform.window:invalidate()
    end
end
 
function activeScreen()
    return Screens[#Screens] and Screens[#Screens] or Screen
end
 
-- Link events to ScreenManager
function on.paint(gc)
   for _, screen in pairs(Screens) do
        screen:paint(gc)
    end
end
 
function on.timer()
    for _, screen in pairs(Screens) do
        screen:timer()
    end
end
 
function on.charIn(ch) activeScreen():charIn(ch) end
function on.arrowKey(key) activeScreen():arrowKey(key) end
function on.escapeKey() activeScreen():escapeKey() end
function on.enterKey() activeScreen():enterKey() end
function on.tabKey() activeScreen():tabKey() end
function on.contextMenu() activeScreen():contextMenu() end
function on.backtabKey() activeScreen():backtabKey() end
function on.backspaceKey() activeScreen():backspaceKey() end
function on.clearKey() activeScreen():clearKey() end
function on.mouseDown(x, y) activeScreen():mouseDown(x, y) end
function on.mouseUp() activeScreen():mouseUp() end
function on.mouseMove(x, y) activeScreen():mouseMove(x, y) end
function on.rightMouseDown(x, y) activeScreen():rightMouseDown(x, y) end
function on.help() activeScreen():help() end
function on.resize() end

Menu = class(Screen)

function Menu:init()
    print("your init code here")
end

function Menu:paint(gc)
    gc:drawString("Hello from the Menu Screen", 5, 5, "top")
end


PushScreen(Menu())
« Last Edit: September 14, 2012, 10:02:00 am by adriweb »
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Offline blfngl

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Re: Trouble with screen managers?
« Reply #6 on: September 14, 2012, 11:04:00 pm »
Thank you very much! And I can add other lines of text too, right?
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Offline Adriweb

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Re: Trouble with screen managers?
« Reply #7 on: September 15, 2012, 03:29:17 am »
Quote from: blfngl on September 14, 2012, 11:04:00 pm
Thank you very much! And I can add other lines of text too, right?
Sure, do whatever you want in the Menu:paint(gc) method.
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