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// widget_assign.ysl2

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widget_desc("Assign") {

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    longdesc

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    ||

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    Arguments are either:

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    - name=value: setting variable with literal value.

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    - name=other_name: copy variable content into another

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    "active"+"inactive" labeled elements can be provided to show feedback when pressed

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    Exemples:

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    HMI:Assign:notify=1@notify=/PLCVAR

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    HMI:Assign:ack=2:notify=1@ack=.local_var@notify=/PLCVAR

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    ||

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    shortdesc > Assign variables on click

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}

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widget_class("Assign") {

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||

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        frequency = 2;

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        onmouseup(evt) {

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            svg_root.removeEventListener("pointerup", this.bound_onmouseup, true);

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            if(this.enable_state) {

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                this.activity_state = false

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                this.request_animate();

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                this.assign();

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            }

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        }

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        onmousedown(){

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            if(this.enable_state) {

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                svg_root.addEventListener("pointerup", this.bound_onmouseup, true);

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                this.activity_state = true;

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                this.request_animate();

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            }

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        }

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||

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}

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widget_defs("Assign") {

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    optional_activable();

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    |     init: function() {

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    |         this.bound_onmouseup = this.onmouseup.bind(this);

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    |         this.element.addEventListener("pointerdown", this.onmousedown.bind(this));

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    |     },

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    |     assignments: {},

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    |     dispatch: function(value, oldval, varnum) {

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    const "widget", ".";

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    foreach "path" {

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        const "varid","generate-id()";

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        const "varnum","position()-1";

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        if "@assign" foreach "$widget/path[@assign]" if "$varid = generate-id()" {

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    |         if(varnum == «$varnum») this.assignments["«@assign»"] = value;

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        }

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    }

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    |     },

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    |     assign: function() {

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    const "paths","path";

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    foreach "arg[contains(@value,'=')]"{

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        const "name","substring-before(@value,'=')";

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        const "value","substring-after(@value,'=')";

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        const "index" foreach "$paths" if "@assign = $name" value "position()-1";

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        const "isVarName", "regexp:test($value,'^[a-zA-Z_][a-zA-Z0-9_]+$')";

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        choose {

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            when "$isVarName"{

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    |         const «$value» = this.assignments["«$value»"];

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    |         if(«$value» != undefined)

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    |             this.apply_hmi_value(«$index», «$value»);

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            }

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            otherwise {

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    |         this.apply_hmi_value(«$index», «$value»);

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            }

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        }

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    }

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    |     },

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}

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