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// widget_jump.ysl2

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

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    param "hmi_element";

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    |     on_click: function(evt) {

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    |         const index = this.indexes.length > 0 ? this.indexes[0] + this.offset : undefined;

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    |         const name = this.args[0];

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    |         switch_page(name, index);

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    |     },

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    |     init: function() {

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    /* registering event this way does not "click" through svg:use 

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    |     this.element.onclick = evt => switch_page(this.args[0]);

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    event must be registered by adding attribute to element instead

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    TODO : generalize mouse event handling by global event capture + getElementsAtPoint()

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    */

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    |         this.element.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_click(evt)");

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    |     },

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}

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template "widget[@type='Jump']", mode="per_page_widget_template"{

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    param "page_desc";

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    /* check that given path is compatible with page's reference path */

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    if "path" {

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        /* when no page name provided, check for same page */

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        const "target_page_name" choose {

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            when "arg" value "arg[1]/@value";

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            otherwise value "$page_desc/arg[1]/@value";

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        }

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        const "target_page_path" choose {

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            when "arg" value "$hmi_pages_descs[arg[1]/@value = $target_page_name]/path[1]/@value";

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            otherwise value "$page_desc/path[1]/@value";

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        }

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        if "not(func:same_class_paths($target_page_path, path[1]/@value))"

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            error > Jump id="«@id»" to page "«$target_page_name»" with incompatible path "«path[1]/@value» (must be same class as "«$target_page_path»")

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    }

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}