// widget_jump.ysl2

template "widget[@type='Jump']", mode="widget_defs" {
    param "hmi_element";

    |     on_click: function(evt) {
    |         const index = this.indexes.length > 0 ? this.indexes[0] + this.offset : undefined;
    |         switch_page(this.args[0], index);
    |     },
    |     init: function() {
    /* registering event this way does not "click" through svg:use 
    |     this.element.onclick = evt => switch_page(this.args[0]);
    event must be registered by adding attribute to element instead
    TODO : generalize mouse event handling by global event capture + getElementsAtPoint()
    */
    |         this.element.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_click(evt)");
    |     },
}

template "widget[@type='Jump']", mode="per_page_widget_template"{
    param "page_desc";
    /* check that given path is compatible with page's reference path */
    if "path" {
        /* when no page name provided, check for same page */
        const "target_page_name" choose {
            when "arg" value "arg[1]/@value";
            otherwise value "$page_desc/arg[1]/@value";
        }
        const "target_page_path" choose {
            when "arg" value "$hmi_pages_descs[arg[1]/@value = $target_page_name]/path[1]/@value";
            otherwise value "$page_desc/path[1]/@value";
        }

        if "not(func:same_class_paths($target_page_path, path[1]/@value))"
            error > Jump id="«@id»" to page "«$target_page_name»" with incompatible path "«path[1]/@value» (must be same class as "«$target_page_path»")
    }
}