Attribute Macro widget_template

#[widget_template]

A macro to generate widget templates.

This macro generates a new type that implements relm4::WidgetTemplate.

Example

use relm4::prelude::*;
use gtk::prelude::*;

#[relm4::widget_template]
impl WidgetTemplate for MyBox {
    view! {
        gtk::Box {
            set_margin_all: 10,
           // Make the boxes visible
            inline_css: "border: 2px solid blue",
        }
    }
}

The template allows you the generate deeply nested structures. All named items will be directly accessible as a child of the template, even if they are nested. In this example the “child_label” is a template child.

#[relm4::widget_template]
impl WidgetTemplate for MySpinner {
    view! {
        gtk::Spinner {
            set_spinning: true,
        }
    }
}

#[relm4::widget_template]
impl WidgetTemplate for CustomBox {
    view! {
        gtk::Box {
            set_orientation: gtk::Orientation::Vertical,
            set_margin_all: 5,
            set_spacing: 5,

            #[template]
            MyBox {
                #[template]
                MySpinner,

                #[template]
                MyBox {
                    #[template]
                    MySpinner,

                    #[template]
                    MyBox {
                        #[template]
                        MySpinner,

                        // Deeply nested!
                        #[name = "child_label"]
                        gtk::Label {
                            set_label: "This is a test",
                        }
                    }
                }
            }
        }
    }
}