slint-ui/slint · error

Cannot invoke callback {global_name}::{name}: {e}

Error message

Cannot invoke callback {global_name}::{name}: {e}

What it means

Error "Cannot invoke callback {global_name}::{name}: {e}" thrown in slint-ui/slint.

Source

Thrown at internal/live-preview/live_component.rs:231

    pub fn set_global_property(&self, global_name: &str, name: &str, value: Value) {
        self.properties.borrow_mut().insert(format!("{global_name}.{name}"), value.clone());
        self.instance()
            .set_global_property(global_name, name, value)
            .unwrap_or_else(|e| panic!("Cannot set property {global_name}::{name}: {e}"))
    }

    /// forward to get_global_property
    pub fn get_global_property(&self, global_name: &str, name: &str) -> Value {
        self.instance()
            .get_global_property(global_name, name)
            .unwrap_or_else(|e| panic!("Cannot get property {global_name}::{name}: {e}"))
    }

    /// Forward to invoke_global
    pub fn invoke_global(&self, global_name: &str, name: &str, args: &[Value]) -> Value {
        self.instance()
            .invoke_global(global_name, name, args)
            .unwrap_or_else(|e| panic!("Cannot invoke callback {global_name}::{name}: {e}"))
    }

    /// Forward to set_global_callback
    pub fn set_global_callback(
        &self,
        global_name: &str,
        name: &str,
        callback: Rc<dyn Fn(&[Value]) -> Value + 'static>,
    ) {
        self.callbacks.borrow_mut().insert(format!("{global_name}.{name}"), callback.clone());
        self.instance()
            .set_global_callback(global_name, name, move |args| callback(args))
            .unwrap_or_else(|e| panic!("Cannot set callback {global_name}::{name}: {e}"));
    }
}

enum WatcherState {
    Starting,

View on GitHub (pinned to 3fd8f2ec03)

Solutions

1. Check the nested error for the invocation failure and fix argument types.
2. Verify the global and callback names.

When it happens

Trigger: Thrown at internal/live-preview/live_component.rs:231 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of slint-ui/slint@3fd8f2ec03 (2026-08-19). Data as JSON: /api/errors/a48802faef1d5819. Report an issue: GitHub.