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// widget_display.ysl2

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widget_desc("Display") {

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    longdesc

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    ||

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    If Display widget is a svg:text element, then text content is replaced by

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    value of given variables, space separated.

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    Otherwise, if Display widget is a group containing a svg:text element

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    labelled "format", then text content is replaced by printf-like formated

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    string. In other words, if "format" labeled text is "%d %s %f", then 3

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    variables paths are expected : HMI_IN, HMI_STRING and HMI_REAL.

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    In case Display widget is a svg::text element, it is also possible to give

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    format string as first argument.

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    ||

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    shortdesc > Printf-like formated text display 

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    arg name="format" count="optional" accepts="string" > printf-like format string when not given as svg:text

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    path name="fields" count="many" accepts="HMI_INT,HMI_REAL,HMI_STRING,HMI_BOOL" > variables to be displayed

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}

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widget_class("Display")

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    ||

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        frequency = 5;

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        dispatch(value, oldval, index) {

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            this.fields[index] = value;    

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            this.request_animate();

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        }

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    ||

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widget_defs("Display") {

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    const "format" optional_labels("format");

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    const "has_format","string-length($format)>0";

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    value "$format";

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    if "$hmi_element[not(self::svg:text)] and not($has_format)"

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        error > Display Widget id="«$hmi_element/@id»" must be a svg::text element itself or a group containing a svg:text element labelled "format"

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    const "field_initializer" foreach "path" {

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        choose{

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            when "@type='HMI_STRING'" > ""

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            otherwise > 0

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        }

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        if "position()!=last()" > ,

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    }

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    |     fields: [«$field_initializer»],

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    |     animate: function(){

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    choose {

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        when "$has_format" {

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    |       if(this.format_elt.getAttribute("lang")) {

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    |           this.format = svg_text_to_multiline(this.format_elt);

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    |           this.format_elt.removeAttribute("lang");

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    |       }

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    |       let str = vsprintf(this.format,this.fields);

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    |       multiline_to_svg_text(this.format_elt, str);

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        }

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        otherwise {

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    |       let str = this.args.length == 1 ? vsprintf(this.args[0],this.fields) : this.fields.join(' ');

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    |       multiline_to_svg_text(this.element, str);

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        }

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    }

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    |     },

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    |     

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    if "$has_format" {

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    |     init: function() {

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    |       this.format = svg_text_to_multiline(this.format_elt);

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    |     },

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    }

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}