slint/internal/compiler/tests/syntax/lookup/two_way_binding.slint

// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-1.0 OR LicenseRef-Slint-commercial

global G := {
    property <int> alala <=> alala;
//                       ^error{Property cannot alias to itself}
    property <string> yoyo <=> alala;
//                         ^error{The property does not have the same type as the bound property}
}

export X := Rectangle {

    property <brush> my_color <=> self.background;
    x <=> y;
    width <=> self.height;


    border_color <=> blue;
//  ^error{The expression in a two way binding must be a property reference}
    border_width <=> 4px + 4px;
//                   ^error{The expression in a two way binding must be a property reference}

    xx := Rectangle {
        x: 42phx;
        width <=> parent.width;
        height <=> x;
        background <=> root.x;
//      ^error{The property does not have the same type as the bound property}
        y <=> y;
//      ^error{Property cannot alias to itself}
    }

    property <int> dd <=> dd;
//                    ^error{Property cannot alias to itself}

    Rectangle {
        x <=> self.loop_on_x;
//      ^error{The binding for the property 'x' is part of a binding loop}
        property <length> loop_on_x <=> x;
//                                  ^error{The binding for the property 'loop-on-x' is part of a binding loop}
    }

    property gyoyo <=> G.yoyo;
}