3 buttons using classes not working

Harrison

Button = Core.class(Sprite)   function Button:onMouseUp(event) if self:hitTestPoint(event.x,event.y) then print("you clicked me!!") end end function Button:init(sprite) print("initializing button") self:addEventListener(Event.MOUSE_UP, self.onMouseUp, self) self:addChild(sprite)   end

I make 3 buttons in main.lua using

local bitmap = Bitmap.new(Texture.new("abuttonimage",true)) x=Button.new(bitmap) x:setPosition(0,0) stage:addChild(x)

repeat with y and z, but change position.
now, only z is visible and running. The others initialise the button, but they do not appear or respond.
it works with 1 button, but not 3.
any ideas on why/how to fix it?

hgvyas123

you should have to do like this

local bitmap = Bitmap.new(Texture.new("abuttonimage",true)) x=Button.new(bitmap) x:setPosition(0,0) stage:addChild(x)   local bitmap = Bitmap.new(Texture.new("abuttonimage",true)) y=Button.new(bitmap) y:setPosition(0,0) stage:addChild(y)   local bitmap = Bitmap.new(Texture.new("abuttonimage",true)) z=Button.new(bitmap) z:setPosition(0,0) stage:addChild(z)

as every bitmap can have only one parent and if you try to add them again in different paren then it will first remove from previous parent and then added in new parent and hence visible only one time

OZApps

@hgvyas123,
but if you set the position of all the buttons to (0,0) they will all sit on top of each other.

@Harrison,
you are passing the function a child that is moved from parent to parent (same instance) as @hgvyas explained. you can try this code as

function Button:init(theSpriteName) local bitmap = Bitmap.new(Texture.new(theSpriteName, true)) self:addChild(sprite) self:addEventListener(... the rest of the code ...) end

and then call it easily as

x = Button.new("abuttonimage.png") y = Button.new("bbuttonimage.png") z = Button.new("cbuttonimage.png")   stage:addChild( add the x, the y and the z)

Or you can as I suggested in my book create a more generic code that looks like

function Button:init(theSpriteName, xPos, yPos, parent) local parent = parent or stage local bitmap = Bitmap.new(Texture.new(theSpriteName, true)) local xPos, yPos = xPos or 0, yPos or 0 self:addChild(sprite) self:addEventListener(... the rest of the code ...) self:setPosition(xPos, yPos) parent:addChild(self) end

so you can call it all in one go as

x = Button.new("abuttonimage.png", 0, 0) y = Button.new("bbuttonimage.png", 100, 100) z = Button.new("cbuttonimage.png", 0, 200)

hgvyas123

ohhh yes Copy Paste error

Harrison

@OZApps
i am trying to make it work, but when i do
local start = Button.new("images/button.png", 10, 0)
in main.lua
and
self:addEventListener(Event.MOUSE_UP, self.onMouseUp, self)
in button.lua it dosent seem to work.. what am i doing wrong?

OZApps

@harrison,
it would help to post your actual code, because there might be something in it that is the issue.

Secondly, there is no function called self.onMouseUp, so you will have to pass it Button.onMouseUp instead. The rest should be all the same.

Harrison

It works now, i misspelled some variables and got mixed up. thanks!

Harrison

Currently attempting to make unique code run based on the
function Button:init(sprite, xPos, yPos, parent) by adding a new variable "name".
the problem is.. i am not sure how to get the name from init to onmousedown without using global variables.
my new onmousedown code would look something like :

unction Button:onMouseDown(event) --check if button is on click coordinates if self:hitTestPoint(event.x,event.y) then if name == "startbutton" then --display pressed button elseif name == "exit" then --display different pressed button end end

My current code:

--make a sprite class "Button" Button = Core.class(Sprite)   --check if button is pressed function Button:onMouseDown(event) --check if button is on click coordinates if self:hitTestPoint(event.x,event.y) then print("hi!")   end end   --check if button is released function Button:onMouseUp(event) --check if the button is on click coordinates if self:hitTestPoint(event.x,event.y) then --debug print print("you clicked me!!") --make a click noise local click= Sound.new("sounds/sfx/clickbutton.wav") click:play() end end   function Button:init(sprite, xPos, yPos, parent) local parent = parent or stage --load the bitmap local bitmap = Bitmap.new(Texture.new(sprite, true)) --load x any y position or set it to 0 local xPos, yPos = xPos or 0, yPos or 0 self:addChild(bitmap) self:addEventListener(Event.MOUSE_UP, Button.onMouseUp , self) self:addEventListener(Event.MOUSE_DOWN, Button.onMouseDown,self) --put the button at the specified x and y self:setPosition(xPos, yPos) parent:addChild(self) end

OZApps

@harrison,
have you tried the

self.name

x = Button.new("exitImage.png", 10,10) x.name = "exit"

and then in your code of

onMouseDown

just check for

self.name == "exit"

Hope that helps,