How to access to the original value of a property?

[srfsh]

I was inspecting the example given in Timer's docs https://docs.slint.dev/latest/docs/slint/reference/timer/. For convenience, I will repeat here:

import { Button } from "std-widgets.slint";
export component Example inherits Window {
    property <int> value: 10;
    timer := Timer {
        interval: 1s;
        running: true;
        triggered() => {
            value -= 1;
            if (value == 0) {
                self.running = false;
            }
        }
    }
    HorizontalLayout {
        Text { text: value; }
        Button {
            text: "Reset";
            clicked() => { value = 10; timer.running = true; }
        }
    }
}

My question is, how can I replace the 10 of clicked() => { value = 10; timer.running = true; } above with something that references the original value of the property value? I tried to add property <int> original: value;, but that seems always references the property value instead of reading it once and acting like a constant.

[srfsh]

I've just discovered that I can do something like this. I am not sure if this has any unwanted side-effects. Please do comment!

property <int> value: 10;
property <int> original;
init => { origanal = value; }

[yanshay]

While it seems fine, the documentation says:

https://docs.slint.dev/latest/docs/slint/reference/common/#init

Don’t use this callback to initialize properties, because this violates the declarative principle.

It depends on the situation, but I use global state to hold the timer values (so easy later also to find them), and then on the trigger at the end of the cycle I initialize the timer to that value if required.

[srfsh]

While it seems fine, the documentation says:

https://docs.slint.dev/latest/docs/slint/reference/common/#init

Don’t use this callback to initialize properties, because this violates the declarative principle.

It depends on the situation, but I use global state to hold the timer values (so easy later also to find them), and then on the trigger at the end of the cycle I initialize the timer to that value if required.

Exactly the reason why I asked for comments. Seems to be working fine for me. I am not using it for anything. It was to test out an idea I had.

Would it be too much trouble for you to provide a snippet for your approach? Might be useful for someone on the wide wide web.

[Vadoola]

In Tomotroid I'm pretty much doing what yanshay suggested. I have some globals one is the active timer count and one is the set point. When the timer resets it just uses the set point. I feel like this is the easiest way. Something liked

import { Button } from "std-widgets.slint"; export component Example inherits Window { property<into> setp: 10 property <int> value: setp; timer := Timer { interval: 1s; running: true; triggered() => { value -= 1; if (value == 0) { self.running = false; } } } HorizontalLayout { Text { text: value; } Button { text: "Reset"; clicked() => { value = setp; timer.running = true; } } } }