svghmi/widget_foreach.ysl2
author Edouard Tisserant <edouard@beremiz.fr>
Tue, 16 Jul 2024 09:41:45 +0200
changeset 3989 987c69b1582f
parent 3603 f1a00aa8cb3b
child 4025 92b3701fceed
permissions -rw-r--r--
MQTT: WIP, added publish thread waking-up when published variables change.
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// widget_foreach.ysl2
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widget_desc("ForEach") {
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    longdesc
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    ||
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    ForEach widget is used to span a small set of widget over a larger set of
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    repeated HMI_NODEs. 
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    Idea is somewhat similar to relative page, but it all happens inside the
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    ForEach widget, no page involved.
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    Together with relative Jump widgets it can be used to build a menu to reach
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    relative pages covering many identical HMI_NODES siblings.
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    ForEach widget takes a HMI_CLASS name as argument and a HMI_NODE path as
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    variable.
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    Direct sub-elements can be either groups of widget to be spanned, labeled
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    "ClassName:offset", or buttons to control the spanning, labeled
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    "ClassName:+/-number".
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    ||
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    shortdesc > span widgets over a set of repeated HMI_NODEs
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    arg name="class_name" accepts="string" > HMI_CLASS name
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    path name="root" accepts="HMI_NODE" >  where to find HMI_NODEs whose HMI_CLASS is class_name
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}
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widget_defs("ForEach") {
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    if "count(path) != 1" error > ForEach widget «$hmi_element/@id» must have one HMI path given.
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    if "count(arg) != 1" error > ForEach widget «$hmi_element/@id» must have one argument given : a class name.
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    const "class","arg[1]/@value";
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    const "base_path","path/@value";
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    const "hmi_index_base", "$indexed_hmitree/*[@hmipath = $base_path]";
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    const "hmi_tree_base", "$hmitree/descendant-or-self::*[@path = $hmi_index_base/@path]";
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    const "hmi_tree_items", "$hmi_tree_base/*[@class = $class]";
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    const "hmi_index_items", "$indexed_hmitree/*[@path = $hmi_tree_items/@path]"; 
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    const "items_paths", "$hmi_index_items/@hmipath"; 
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    |     index_pool: [
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    foreach "$hmi_index_items" {
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    |       «@index»`if "position()!=last()" > ,`
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    }
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    |     ],
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    |     init: function() {
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    const "prefix","concat($class,':')";
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    const "buttons_regex","concat('^',$prefix,'[+\-][0-9]+')";
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    const "buttons", "$hmi_element/*[regexp:test(@inkscape:label, $buttons_regex)]"; 
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    foreach "$buttons" {
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        const "op","substring-after(@inkscape:label, $prefix)";
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    |         id("«@id»").setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_click('«$op»', evt)");
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    }
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    |
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    |         this.items = [
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    const "items_regex","concat('^',$prefix,'[0-9]+')";
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    const "unordered_items","$hmi_element//*[regexp:test(@inkscape:label, $items_regex)]";
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    foreach "$unordered_items" {
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        const "elt_label","concat($prefix, string(position()))"; 
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        const "elt","$unordered_items[@inkscape:label = $elt_label]";
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        const "pos","position()";
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        const "item_path", "$items_paths[$pos]";
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    |           [ /* item="«$elt_label»" path="«$item_path»" */
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        if "count($elt)=0" error > Missing item labeled «$elt_label» in ForEach widget «$hmi_element/@id»
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        foreach "func:refered_elements($elt)[@id = $hmi_elements/@id][not(@id = $elt/@id)]" {
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            if "not(func:is_descendant_path(func:widget(@id)/path/@value, $item_path))"
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                error > Widget id="«@id»" label="«@inkscape:label»" is having wrong path. Accroding to ForEach widget ancestor id="«$hmi_element/@id»", path should be descendant of "«$item_path»".
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    |             hmi_widgets["«@id»"]`if "position()!=last()" > ,`
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        }
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    |           ]`if "position()!=last()" > ,`
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    }
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    |         ]
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    |     },
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    |     item_offset: 0,
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}
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widget_class("ForEach")
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||
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    unsub_items(){
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        for(let item of this.items){
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            for(let widget of item) {
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                widget.unsub();
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            }
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        }
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    }
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    unsub(){
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        this.unsub_items();
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        this.offset = 0;
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        this.relativeness = undefined;
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    }
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    sub_items(){
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        for(let i = 0; i < this.items.length; i++) {
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            let item = this.items[i];
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            let orig_item_index = this.index_pool[i];
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            let item_index = this.index_pool[i+this.item_offset];
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            let item_index_offset = item_index - orig_item_index;
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            if(this.relativeness[0])
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                item_index_offset += this.offset;
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            for(let widget of item) {
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                /* all variables of all widgets in a ForEach are all relative. 
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                   Really.
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                   TODO: allow absolute variables in ForEach widgets
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                */
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                widget.sub(item_index_offset, widget.indexes.map(_=>true));
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            }
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        }
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    }
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    sub(new_offset=0, relativeness=[]){
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        this.offset = new_offset;
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        this.relativeness = relativeness;
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        this.sub_items();
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    }
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    apply_cache() {
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        this.items.forEach(item=>item.forEach(widget=>widget.apply_cache()));
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    }
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    on_click(opstr, evt) {
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        let new_item_offset = eval(String(this.item_offset)+opstr);
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        if(new_item_offset + this.items.length > this.index_pool.length) {
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            if(this.item_offset + this.items.length == this.index_pool.length)
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                new_item_offset = 0;
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            else
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                new_item_offset = this.index_pool.length - this.items.length;
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        } else if(new_item_offset < 0) {
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            if(this.item_offset == 0)
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                new_item_offset = this.index_pool.length - this.items.length;
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            else
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                new_item_offset = 0;
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        }
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        this.item_offset = new_item_offset;
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        this.unsub_items();
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        this.sub_items();
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        update_subscriptions();
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        this.apply_cache(); 
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        jumps_need_update = true;
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        requestHMIAnimation();
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    }
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||
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