Touched, touching, good touch/bad touch, I'm telling...

Questions
1

So… I have a button. I touch my button and it calls my btn.action function as I end touch, great. I can also do good with start touch and moving…

But I need a “is touching” or “touching” hook so if I hold the button it will continue to trigger.

I assume I am SOL on this because it’s not documented… But…

Best practice would be: on start touch set a flag, on end touch clean flag and in “draw” if flag is on do action???

Make sense?

2

That’s how I would do it.

3

Similarly, several apps on the market have the function of touching and holding a button, icon, etc. which then opens another screen for further options.

This would be cool to implement.

4

something like?

if touch.state == BEGAN and touchOnButton() then
    isTouching = true
elseif touch.state == ENDED and touchOnButton() then
    isTouching = false
end
5

That is sort of what I did.

but more like this:

if touch.state == BEGAN and touchOnButton() then
    isTouching = true
elseif touch.state == ENDED  then
    isTouching = false
end

if you keep the touchOnButton() in place then if you slide off the button the push never ends.

6

My touch library handles this sort of thing fairly well, particularly with regard to assigning touches to particular objects and tracking that through the touch’s lifetime.

7

@Andrew_Stacey I was thinking if you make sure all controls/objects(classes in my case) have a x,y,w,h it could create some sort of standard routine to handle touching.

sounds like you already have. I really wish apple would allow better collaboration and code sharing.

For now I allow each class to handle there own events, both draw and touch.

8

@wrmichael A full description of my system is at http://loopspace.mathforge.org/discussion/10/touch-tutorial. You can get the file from http://www.math.ntnu.no/~stacey/code/CodeaLibrary/Touch.lua. As this is the most basic of my library code, you don’t need any of my other libraries to use it.