// widget_dropdown.ysl2

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

param "hmi_element";

labels("text box");

||

dispatch: function(value) {

if(!this.opened) this.set_selection(value);

},

init: function() {

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

this.text_bbox = this.text_elt.getBBox()

this.box_bbox = this.box_elt.getBBox()

lmargin = this.text_bbox.x - this.box_bbox.x;

tmargin = this.text_bbox.y - this.box_bbox.y;

rmargin = this.box_bbox.width - this.text_bbox.width - lmargin;

bmargin = this.box_bbox.height - this.text_bbox.height - tmargin;

this.margins = [lmargin, tmargin, rmargin, bmargin].map(x => Math.max(x,0));

this.content = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten",

"eleven", "twelve", "thirteen", "fourteen", "fifteen"];

//this.content = ["one", "two", "three", "four", "5", "6"];

this.menu_offset = 0;

this.lift = 0;

this.opened = false;

},

on_selection_click: function(selection) {

this.set_selection(selection);

},

on_click: function() {

if(this.opened){

//this.close();

}else{

this.open();

}

},

on_backward_click:function(){

this.move(false);

},

on_forward_click:function(){

this.move(true);

},

set_selection: function(value) {

this.text_elt.firstElementChild.textContent =

(value >= 0 && value < this.content.length) ?

this.content[value] : "?"+String(value)+"?";

},

grow_text: function(up_to) {

let count = 1;

let txt = this.text_elt;

let first = txt.firstElementChild;

let bounds = svg_root.getBoundingClientRect();

this.lift = 0;

while(count < up_to) {

let next = first.cloneNode();

next.removeAttribute("y");

next.setAttribute("dy", "1.1em");

next.textContent = "...";

txt.appendChild(next);

let rect = txt.getBoundingClientRect();

if(rect.bottom > bounds.bottom){

let backup = first.getAttribute("dy");

first.setAttribute("dy", "-"+String((this.lift+1)*1.1)+"em");

rect = txt.getBoundingClientRect();

if(rect.top > bounds.top){

this.lift += 1;

} else {

if(backup)

first.setAttribute("dy", backup);

else

first.removeAttribute("dy");

txt.removeChild(next);

return count;

}

}

count++;

}

return count;

},

close: function(){

this.reset_text();

this.reset_box();

this.opened = false;

},

set_complete_text: function(){

let spans = this.text_elt.children;

let c = 0;

for(let item of this.content){

let span=spans[c];

span.textContent = item;

span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_selection_click("+c+")");

c++;

}

},

move: function(forward){

let contentlength = this.content.length;

let spans = this.text_elt.children;

let spanslength = spans.length;

if(this.menu_offset != 0) spanslength--;

if(this.menu_offset < contentlength - 1) spanslength--;

if(forward){

this.menu_offset = Math.min(

contentlength - spans.length + 1,

this.menu_offset + spanslength);

}else{

this.menu_offset = Math.max(

0,

this.menu_offset - spanslength);

}

console.log(this.menu_offset);

this.set_partial_text();

},

set_partial_text: function(){

let spans = this.text_elt.children;

let contentlength = this.content.length;

let spanslength = spans.length;

let i = this.menu_offset, c = 0;

while(c < spanslength){

let span=spans[c];

if(c == 0 && i != 0){

span.textContent = "↑ ↑ ↑";

span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_backward_click()");

}else if(c == spanslength-1 && i < contentlength - 1){

span.textContent = "↓ ↓ ↓";

span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_forward_click()");

}else{

span.textContent = this.content[i];

span.setAttribute("onclick", "hmi_widgets['«$hmi_element/@id»'].on_selection_click("+i+")");

i++;

}

c++;

}

},

open: function(){

let length = this.content.length;

this.reset_text();

let slots = this.grow_text(length);

if(slots == length) {

this.set_complete_text();

} else {

this.set_partial_text();

}

this.adjust_box_to_text();

/* TODO disable interaction with background */

this.opened = true;

},

reset_text: function(){

let txt = this.text_elt;

let first = txt.firstElementChild;

first.removeAttribute("onclick");

first.removeAttribute("dy");

for(let span of Array.from(txt.children).slice(1)){

txt.removeChild(span)

}

},

reset_box: function(){

let m = this.box_bbox;

let b = this.box_elt;

b.x.baseVal.value = m.x;

b.y.baseVal.value = m.y;

b.width.baseVal.value = m.width;

b.height.baseVal.value = m.height;

},

adjust_box_to_text: function(){

let [lmargin, tmargin, rmargin, bmargin] = this.margins;

let m = this.text_elt.getBBox();

let b = this.box_elt;

b.x.baseVal.value = m.x - lmargin;

b.y.baseVal.value = m.y - tmargin;

b.width.baseVal.value = lmargin + m.width + rmargin;

b.height.baseVal.value = tmargin + m.height + bmargin;

},

||

}

// | let p = new DOMPoint(this.box_elt.x.baseVal.value, this.box_elt.y.baseVal.value);

// | let k = DOMMatrix.fromMatrix(this.box_elt.getCTM());

// | let new_corner = k.transformPoint(p);

// | new_corner.y = 0;

// | let nc = k.inverse().transformPoint(new_corner);

// | this.box_elt.x.baseVal.value = nc.x;

// | this.box_elt.y.baseVal.value = nc.y;