// widget_slider.ysl2

template "widget[@type='Slider']", mode="widget_class"

||

class SliderWidget extends Widget{

frequency = 5;

range = undefined;

fi = undefined;

drag = false;

enTimer = false;

dispatch(value) {

if(!this.drag){

if(this.value_elt)

this.value_elt.textContent = String(value);

this.handle_position(value);

}

}

handle_position(value){

let [min,max,start,totallength] = this.range;

let length = Math.max(0,Math.min(totallength,(Number(value)-min)*totallength/(max-min)));

let tip = this.range_elt.getPointAtLength(length);

this.handle_elt.setAttribute('transform',"translate("+(tip.x-start.x)+","+(tip.y-start.y)+")");

}

on_release(evt) {

if(this.drag){

this.drag = false;

}

}

update_position(evt){

if(this.drag && this.enTimer){

var html_dist = 0;

var svg_dist = 0;

//calculate size of widget in html

var range_borders = this.range_elt.getBoundingClientRect();

var range_length = Math.sqrt( range_borders.height*range_borders.height + range_borders.width*range_borders.width );

var [minX,minY,maxX,maxY] = [range_borders.left,range_borders.bottom,range_borders.right,range_borders.top];

//get range and mouse coordinates

var mouseX = undefined;

var mouseY = undefined;

if (evt.type.startsWith("touch")){

mouseX = Math.ceil(evt.touches[0].clientX);

mouseY = Math.ceil(evt.touches[0].clientY);

}

else{

mouseX = evt.pageX;

mouseY = evt.pageY;

}

//get handle distance from mouse position

if (minX > mouseX && minY < mouseY){

html_dist = 0;

}

else if (maxX < mouseX && maxY > mouseY){

html_dist = range_length;

}

else{

// calculate distace

if(this.fi > 0.7){

html_dist = (minY - mouseY)/Math.sin(this.fi);

}

else{

html_dist = (mouseX - minX)/Math.cos(this.fi);

}

//check if in range

if (html_dist > range_length){

html_dist = range_length;

}

else if (html_dist < 0){

html_dist = 0;

}

}

//redraw handle

this.handle_position(svg_dist=(html_dist/range_length)*this.range[1]);

this.value_elt.textContent = String(Math.ceil(svg_dist));

change_hmi_value(this.indexes[0], "="+Math.ceil(svg_dist));

//reset timer

this.enTimer = false;

setTimeout("{hmi_widgets['"+this.element_id+"'].enTimer = true;}", 100);

}

}

on_select(evt){

this.drag = true;

this.enTimer = true;

this.update_position(evt);

}

init() {

let min = this.min_elt ?

Number(this.min_elt.textContent) :

this.args.length >= 1 ? this.args[0] : 0;

let max = this.max_elt ?

Number(this.max_elt.textContent) :

this.args.length >= 2 ? this.args[1] : 100;

this.range = [min, max, this.range_elt.getPointAtLength(0),this.range_elt.getTotalLength()];

let start = this.range_elt.getPointAtLength(0);

let end = this.range_elt.getPointAtLength(this.range_elt.getTotalLength());

this.fi = Math.atan2(start.y-end.y, end.x-start.x);

this.handle_elt.addEventListener("touchstart", hmi_widgets[this.element_id].on_select.bind(this));

this.handle_elt.addEventListener("mousedown", hmi_widgets[this.element_id].on_select.bind(this));

this.element.addEventListener("mousedown", hmi_widgets[this.element_id].on_select.bind(this));

window.addEventListener("touchmove", hmi_widgets[this.element_id].update_position.bind(this));

window.addEventListener("mousemove", hmi_widgets[this.element_id].update_position.bind(this));

window.addEventListener("mouseup", hmi_widgets[this.element_id].on_release.bind(this))

window.addEventListener("touchend", hmi_widgets[this.element_id].on_release.bind(this));

window.addEventListener("touchcancel", hmi_widgets[this.element_id].on_release.bind(this));

}

}

||

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

param "hmi_element";

labels("handle range");

optional_labels("value min max");

|,

}