API help

info={
	x=0,y=0,sizeX=0,sizeY=0,bCol=0,tCol=0,text="",visible=false;
}
local x,y,sizeX,sizeY;
local bCol,tCol;
local text;
local visible=false;

local apisPath="";
local apisNeeded={
	"Graphics",
}

function init(self)
	os.loadAPI(apisPath.."loadAPI")
	loadstring(loadAPI.forLoadString());
	local env=getfenv();
	for k,v in pairs(apisNeeded) do
		if not env[v] then
			if not os.loadAPI(apisPath..v..".lua") then
				error("Unable to load required API "..v);
			end
		end
	end
	local copy={};
	for k,v in pairs(self) do
		if k~="init" then
			copy[k]=v;
		end
	end
	return setmetatable(copy,getmetatable(self));
end

function setSize(self,nX,nY)
	self.info.sizeX=nX;
	self.info.sizeY=nY;
	return self;
end

function setLoc(self,nX,nY)
	self.info.x=nX;
	self.info.y=nY;
	return self;
end

function setPos(self,nX,nY)
	self.info.x=nX;
	self.info.y=nY;
	return self;
end

function setBackColor(self,col)
	self.info.bCol=col;
	return self;
end

function setBackgroundColor(self,col)
	self.info.bCol=col;
	return self;
end

function setTextColor(self,col)
	self.info.tCol=col;
	return self;
end

function setText(self,tx)
	self.info.text=tx;
	return self;
end

function setVisible(self,bool)
	self.info.visible=bool;
	return self;
end

function draw(self)
	if self.info.visible then
		tX=self.info.x;
		tY=self.info.y;
		tX2=self.info.x+self.info.sizeX-1;
		tY2=self.info.y+self.info.sizeY;
		ok,err=pcall(Graphics.paintBox,tX,tY,tX2,tY2,self.info.bCol or colors.black);
		if not ok then print(err); return false; end
		ok,err=pcall(Graphics.writeTextCentered,tX,tX2,tY+(self.info.sizeY/2),self.info.text or "",self.info.tCol or colors.white);
		if not ok then print(err); return false; end
	end
	return true;
end

b=Button:init();

a = 1

a = {}

b = a

Bomb Bloke, on 26 June 2014 - 03:31 AM said:

"b" will not get assigned a new table - it'll get a copy of "a"'s pointer, which leads to the same table you created before. Inserting something into "a" will also see it go into "b", because really both variables are now leading to the same spot in memory.

Assigning functions (and co-routines, apparently) works the same.

Anyway, during your init process, you're not assigning each new button a new copy of the "info" table: You're assigning them pointers to the original "info" table.

Stick your "info" table declaration in the "init" function (and make it local while you're at it). Be sure to copy that new pointer into the table to be returned by the function.

function init(self)
	new={};
	new.info={x=0,y=0,sizeX=0,sizeY=0,bCol=0,tCol=0,text="",visible=false};
	os.loadAPI(apisPath.."loadAPI")
	loadstring(loadAPI.forLoadString());
	local env=getfenv();
	for k,v in pairs(apisNeeded) do
		if not env[v] then
			if not os.loadAPI(apisPath..v..".lua") then
				error("Unable to load required API "..v);
			end
		end
	end
	for k,v in pairs(self) do
		if k~="init" then
			new[k]=v;
		end
	end
	return setmetatable(new,self);
end

Bomb Bloke, on 27 June 2014 - 02:46 AM said:

That looks good to me. Can you show the code you're using to init then draw your two buttons? Which of the two buttons gets drawn?

build=1;

local apisPath="";
local apisNeeded={
	"Graphics",
}

function init(self)
	new={};
	new.info={x=0,y=0,sizeX=0,sizeY=0,bCol=0,tCol=0,text="",visible=false};
	os.loadAPI(apisPath.."loadAPI")
	loadstring(loadAPI.forLoadString());
	local env=getfenv();
	for k,v in pairs(apisNeeded) do
		if not env[v] then
			if not os.loadAPI(apisPath..v..".lua") then
				error("Unable to load required API "..v);
			end
		end
	end
	for k,v in pairs(self) do
		if k~="init" then
			new[k]=v;
		end
	end
	return setmetatable(new,self);
end


function setSize(self,nX,nY)
	self.info.sizeX=nX;
	self.info.sizeY=nY;
	return self;
end

function setLoc(self,nX,nY)
	self.info.x=nX;
	self.info.y=nY;
	return self;
end

function setPos(self,nX,nY)
	self.info.x=nX;
	self.info.y=nY;
	return self;
end

function setBackColor(self,col)
	self.info.bCol=col;
	return self;
end

function setBackgroundColor(self,col)
	self.info.bCol=col;
	return self;
end

function setTextColor(self,col)
	self.info.tCol=col;
	return self;
end

function setText(self,tx)
	self.info.text=tx;
	return self;
end

function setVisible(self,bool)
	self.info.visible=bool;
	return self;
end

function draw(self)
	if self.info.visible then
		tX=self.info.x;
		tY=self.info.y;
		tX2=self.info.x+self.info.sizeX-1;
		tY2=self.info.y+self.info.sizeY;
		ok,err=pcall(Graphics.paintBox,tX,tY,tX2,tY2,self.info.bCol or colors.black);
		if not ok then print(err); return false; end
		ok,err=pcall(Graphics.writeTextCentered,tX,tX2,tY+(self.info.sizeY/2),self.info.text or "",self.info.tCol or colors.white);
		if not ok then print(err); return false; end
	end
	return true;
end

ok,err=pcall((function()
os.loadAPI("loadAPI");
load=loadAPI.loadAPI;
load("Button.lua");
load("Graphics.lua");
b=Button:init();
b:setText("Test")
b:setSize(10,3)
b:setPos(10,10)
b:setBackColor(colors.green)
b:setTextColor(colors.cyan)
b:setVisible(true);
c=Button:init();
c:setText("Button")
c:setSize(10,3)
c:setPos(10,4)
c:setBackColor(colors.green)
c:setTextColor(colors.cyan)
Graphics.paintFullScreen(colors.black);
b:draw();
c:draw();
os.pullEvent();
end))
if not ok then print(err) end
os.unloadAPI("Button");
os.unloadAPI("Graphics")

c:setVisible(true);