slint/internal/compiler/tests/syntax/functions/functions.slint

// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0

Abc := Rectangle {
    function par() {}
}

export Xxx := Rectangle {
    function fooo(a: int, a: int) -> int { return a; }
//                        ^error{Duplicated argument name 'a'}

    function plop2() -> int {
//  ^error{Cannot convert string to int}
        return 45;
        "xxx"
    }

    function plop3() { return 45; "xxx" }

    function plop4(string: int) -> int {  return "45"; }
//                                        ^error{Cannot convert string to int}

    function plop5() {  plop4("456") }
//                            ^error{Cannot convert string to int}


    function background() {}
//           ^error{Cannot declare function 'background' when a property with the same name exists}


    Abc {
        property <int> par;
//                     ^error{Cannot declare property 'par' when a callback with the same name exists}
        callback par();
//               ^error{Cannot declare callback 'par' when a function with the same name exists}
    }

    TouchArea {
        function clicked() {}
//               ^error{Cannot override 'clicked'}
    }

    Abc {  par => {} }
//         ^error{'par' is not a callback in Abc}
    aa := Abc { par: 42; }
//              ^error{Cannot assign to par in Abc because it does not have a valid property type}
    Abc { par <=> aa.par; }
//        ^error{Cannot assign to par in Abc because it does not have a valid property type}
//        ^^error{Cannot bind to a function}
//                   ^^^error{The function 'par' is private. Annotate it with 'public' to make it accessible from other components}
    fooo => {}
//  ^error{'fooo' is not a callback in Rectangle}

}