min max value next prev btn

[yall]

inline function onnextControl(component, value)
{
	viewport.setValue((viewport.getValue() + 1));
	viewport.changed();
	
};

Content.getComponent("next").setControlCallback(onnextControl);

hello, I am trying to make a next/prev button from my preset list in a viewport. it works but if I press prev once the first preset in my list is selected my viewport continues to scroll in vain. as if there was no min and max value. I don't know if you understand. To put it simply, I would simply like to navigate from the first to the last preset without it going over. if I have 10 presets I want to be able to navigate between my 10 presets and not -1 preset -2 preset 11, 12 13 preset. :) what is missing from my line? I tried getmaxValue but to no avail

[d.healey]

@yall

You need to check if the new value will exceed the min/max before you apply it.

inline function onnextControl(component, value)
{
    if (viewport.getValue() + 1 > viewport.get("max"))
      return;

    viewport.setValue((viewport.getValue() + 1));
    viewport.changed();
};

[d.healey]

Actually I just realised the viewport doesn't have a max property so you'll need to decide what you max is some other way. But apart from that the principle is the same.

[yall]

@d-healey and yes that is the problem. so I should probably know how many presets I have. imagine 150 I must put max=150?

[d.healey]

@yall Or you could use Engine.getUserPresetList().length to find out the actual number.

[yall]

@d-healey

if (value)
{
    viewport.setValue( viewport.getValue() == 0 ? list.length-1 :  viewport.getValue() - 1);
     viewport.changed();
}

it's ok ;) thank u