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input-knobs.js
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input-knobs.js
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window.addEventListener("load",()=>{
let op=window.inputKnobsOptions||{};
op.knobWidth=op.knobWidth||op.knobDiameter||64;
op.knobHeight=op.knobHeight||op.knobDiameter||64;
op.sliderWidth=op.sliderWidth||op.sliderDiameter||128;
op.sliderHeight=op.sliderHeight||op.sliderDiameter||20;
op.switchWidth=op.switchWidth||op.switchDiameter||24;
op.switchHeight=op.switchHeight||op.switchDiameter||24;
op.fgcolor=op.fgcolor||"#f00";
op.bgcolor=op.bgcolor||"#000";
op.knobMode=op.knobMode||"linear";
op.sliderMode=op.sliderMode||"relative";
let styles=document.createElement("style");
styles.innerHTML=
`input[type=range].input-knob,input[type=range].input-slider{
-webkit-appearance:none;
-moz-appearance:none;
border:none;
box-sizing:border-box;
overflow:hidden;
background-repeat:no-repeat;
background-size:100% 100%;
background-position:0px 0%;
background-color:transparent;
touch-action:none;
}
input[type=range].input-knob{
width:${op.knobWidth}px; height:${op.knobHeight}px;
}
input[type=range].input-slider{
width:${op.sliderWidth}px; height:${op.sliderHeight}px;
}
input[type=range].input-knob::-webkit-slider-thumb,input[type=range].input-slider::-webkit-slider-thumb{
-webkit-appearance:none;
opacity:0;
}
input[type=range].input-knob::-moz-range-thumb,input[type=range].input-slider::-moz-range-thumb{
-moz-appearance:none;
height:0;
border:none;
}
input[type=range].input-knob::-moz-range-track,input[type=range].input-slider::-moz-range-track{
-moz-appearance:none;
height:0;
border:none;
}
input[type=checkbox].input-switch,input[type=radio].input-switch {
width:${op.switchWidth}px;
height:${op.switchHeight}px;
-webkit-appearance:none;
-moz-appearance:none;
background-size:100% 200%;
background-position:0% 0%;
background-repeat:no-repeat;
border:none;
border-radius:0;
background-color:transparent;
}
input[type=checkbox].input-switch:checked,input[type=radio].input-switch:checked {
background-position:0% 100%;
}`;
document.head.appendChild(styles);
let makeKnobFrames=(fr,fg,bg)=>{
let r=
`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="64" height="${fr*64}" viewBox="0 0 64 ${fr*64}" preserveAspectRatio="none">
<defs><g id="K"><circle cx="32" cy="32" r="30" fill="${bg}"/>
<line x1="32" y1="28" x2="32" y2="7" stroke-linecap="round" stroke-width="6" stroke="${fg}"/></g></defs>
<use xlink:href="#K" transform="rotate(-135,32,32)"/>`;
for(let i=1;i<fr;++i)
r+=`<use xlink:href="#K" transform="translate(0,${64*i}) rotate(${-135+270*i/fr},32,32)"/>`;
return r+"</svg>";
}
let makeHSliderFrames=(fr,fg,bg,w,h)=>{
let r=
`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="${w}" height="${fr*h}" viewBox="0 0 ${w} ${fr*h}" preserveAspectRatio="none">
<defs><g id="B"><rect x="0" y="0" width="${w}" height="${h}" rx="${h/2}" ry="${h/2}" fill="${bg}"/></g>
<g id="K"><circle x="${w/2}" y="0" r="${h/2*0.9}" fill="${fg}"/></g></defs>`;
for(let i=0;i<fr;++i){
r+=`<use xlink:href="#B" transform="translate(0,${h*i})"/>`;
r+=`<use xlink:href="#K" transform="translate(${h/2+(w-h)*i/100},${h/2+h*i})"/>`;
}
return r+"</svg>";
}
let makeVSliderFrames=(fr,fg,bg,w,h)=>{
let r=
`<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="${w}" height="${fr*h}" viewBox="0 0 ${w} ${fr*h}" preserveAspectRatio="none">
<defs><rect id="B" x="0" y="0" width="${w}" height="${h}" rx="${w/2}" ry="${w/2}" fill="${bg}"/>
<circle id="K" x="0" y="0" r="${w/2*0.9}" fill="${fg}"/></defs>`;
for(let i=0;i<fr;++i){
r+=`<use xlink:href="#B" transform="translate(0,${h*i})"/>`;
r+=`<use xlink:href="#K" transform="translate(${w/2} ${h*(i+1)-w/2-i*(h-w)/100})"/>`;
}
return r+"</svg>";
}
let initSwitches=(el)=>{
let w,h,d,fg,bg;
if(el.inputKnobs)
return;
el.inputKnobs={};
el.refresh=()=>{
let src=el.getAttribute("data-src");
d=+el.getAttribute("data-diameter");
let st=document.defaultView.getComputedStyle(el,null);
w=parseFloat(el.getAttribute("data-width")||d||st.width);
h=parseFloat(el.getAttribute("data-height")||d||st.height);
bg=el.getAttribute("data-bgcolor")||op.bgcolor;
fg=el.getAttribute("data-fgcolor")||op.fgcolor;
el.style.width=w+"px";
el.style.height=h+"px";
if(src)
el.style.backgroundImage="url("+src+")";
else {
let minwh=Math.min(w,h);
let svg=
`<svg xmlns="http://www.w3.org/2000/svg" width="${w}" height="${h*2}" viewBox="0 0 ${w} ${h*2}" preserveAspectRatio="none">
<g><rect fill="${bg}" x="1" y="1" width="${w-2}" height="${h-2}" rx="${minwh*0.25}" ry="${minwh*0.25}"/>
<rect fill="${bg}" x="1" y="${h+1}" width="${w-2}" height="${h-2}" rx="${minwh*0.25}" ry="${minwh*0.25}"/>
<circle fill="${fg}" cx="${w*0.5}" cy="${h*1.5}" r="${minwh*0.25}"/></g></svg>`;
el.style.backgroundImage="url(data:image/svg+xml;base64,"+btoa(svg)+")";
}
};
el.refresh();
};
let initKnobs=(el)=>{
let w,h,d,fg,bg;
if(el.inputKnobs){
el.redraw();
return;
}
let ik=el.inputKnobs={};
el.refresh=()=>{
d=+el.getAttribute("data-diameter");
let st=document.defaultView.getComputedStyle(el,null);
w=parseFloat(el.getAttribute("data-width")||d||st.width);
h=parseFloat(el.getAttribute("data-height")||d||st.height);
bg=el.getAttribute("data-bgcolor")||op.bgcolor;
fg=el.getAttribute("data-fgcolor")||op.fgcolor;
ik.sensex=ik.sensey=200;
if(el.className.indexOf("input-knob")>=0)
ik.itype="k";
else{
if(w>=h){
ik.itype="h";
ik.sensex=w-h;
ik.sensey=Infinity;
el.style.backgroundSize="auto 100%";
}
else{
ik.itype="v";
ik.sensex=Infinity;
ik.sensey=h-w;
el.style.backgroundSize="100% auto";
}
}
el.style.width=w+"px";
el.style.height=h+"px";
ik.frameheight=h;
let src=el.getAttribute("data-src");
if(src){
el.style.backgroundImage=`url(${src})`;
let sp=+el.getAttribute("data-sprites");
if(sp)
ik.sprites=sp;
else
ik.sprites=0;
if(ik.sprites>=1)
el.style.backgroundSize=`100% ${(ik.sprites+1)*100}%`;
else if(ik.itype!="k"){
el.style.backgroundColor=bg;
el.style.borderRadius=Math.min(w,h)*0.25+"px";
}
}
else{
let svg;
switch(ik.itype){
case "k": svg=makeKnobFrames(101,fg,bg); break;
case "h": svg=makeHSliderFrames(101,fg,bg,w,h); break;
case "v": svg=makeVSliderFrames(101,fg,bg,w,h); break;
}
ik.sprites=100;
el.style.backgroundImage="url(data:image/svg+xml;base64,"+btoa(svg)+")";
el.style.backgroundSize=`100% ${(ik.sprites+1)*100}%`;
}
ik.valrange={min:+el.min, max:(el.max=="")?100:+el.max, step:(el.step=="")?1:+el.step};
el.redraw(true);
};
el.setValue=(v)=>{
v=(Math.round((v-ik.valrange.min)/ik.valrange.step))*ik.valrange.step+ik.valrange.min;
if(v<ik.valrange.min) v=ik.valrange.min;
if(v>ik.valrange.max) v=ik.valrange.max;
el.value=v;
if(el.value!=ik.oldvalue){
el.setAttribute("value",el.value);
el.redraw();
let event=document.createEvent("HTMLEvents");
event.initEvent("input",false,true);
el.dispatchEvent(event);
ik.oldvalue=el.value;
}
};
ik.pointerdown=(ev)=>{
el.focus();
const evorg = ev;
if(ev.touches)
ev = ev.touches[0];
let rc=el.getBoundingClientRect();
let cx=(rc.left+rc.right)*0.5,cy=(rc.top+rc.bottom)*0.5;
let dx=ev.clientX,dy=ev.clientY;
let da=Math.atan2(ev.clientX-cx,cy-ev.clientY);
if(ik.itype=="k"&&op.knobMode=="circularabs"){
dv=ik.valrange.min+(da/Math.PI*0.75+0.5)*(ik.valrange.max-ik.valrange.min);
el.setValue(dv);
}
if(ik.itype!="k"&&op.sliderMode=="abs"){
dv=(ik.valrange.min+ik.valrange.max)*0.5+((dx-cx)/ik.sensex-(dy-cy)/ik.sensey)*(ik.valrange.max-ik.valrange.min);
el.setValue(dv);
}
ik.dragfrom={x:ev.clientX,y:ev.clientY,a:Math.atan2(ev.clientX-cx,cy-ev.clientY),v:+el.value};
document.addEventListener("mousemove",ik.pointermove);
document.addEventListener("mouseup",ik.pointerup);
document.addEventListener("touchmove",ik.pointermove);
document.addEventListener("touchend",ik.pointerup);
document.addEventListener("touchcancel",ik.pointerup);
document.addEventListener("touchstart",ik.preventScroll);
evorg.preventDefault();
evorg.stopPropagation();
};
ik.pointermove=(ev)=>{
let dv;
let rc=el.getBoundingClientRect();
let cx=(rc.left+rc.right)*0.5,cy=(rc.top+rc.bottom)*0.5;
if(ev.touches)
ev = ev.touches[0];
let dx=ev.clientX-ik.dragfrom.x,dy=ev.clientY-ik.dragfrom.y;
let da=Math.atan2(ev.clientX-cx,cy-ev.clientY);
switch(ik.itype){
case "k":
switch(op.knobMode){
case "linear":
dv=(dx/ik.sensex-dy/ik.sensey)*(ik.valrange.max-ik.valrange.min);
if(ev.shiftKey)
dv*=0.2;
el.setValue(ik.dragfrom.v+dv);
break;
case "circularabs":
if(!ev.shiftKey){
dv=ik.valrange.min+(da/Math.PI*0.75+0.5)*(ik.valrange.max-ik.valrange.min);
el.setValue(dv);
break;
}
case "circularrel":
if(da>ik.dragfrom.a+Math.PI) da-=Math.PI*2;
if(da<ik.dragfrom.a-Math.PI) da+=Math.PI*2;
da-=ik.dragfrom.a;
dv=da/Math.PI/1.5*(ik.valrange.max-ik.valrange.min);
if(ev.shiftKey)
dv*=0.2;
el.setValue(ik.dragfrom.v+dv);
}
break;
case "h":
case "v":
dv=(dx/ik.sensex-dy/ik.sensey)*(ik.valrange.max-ik.valrange.min);
if(ev.shiftKey)
dv*=0.2;
el.setValue(ik.dragfrom.v+dv);
break;
}
};
ik.pointerup=()=>{
document.removeEventListener("mousemove",ik.pointermove);
document.removeEventListener("touchmove",ik.pointermove);
document.removeEventListener("mouseup",ik.pointerup);
document.removeEventListener("touchend",ik.pointerup);
document.removeEventListener("touchcancel",ik.pointerup);
document.removeEventListener("touchstart",ik.preventScroll);
let event=document.createEvent("HTMLEvents");
event.initEvent("change",false,true);
el.dispatchEvent(event);
};
ik.preventScroll=(ev)=>{
ev.preventDefault();
};
ik.keydown=()=>{
el.redraw();
};
ik.wheel=(ev)=>{
let delta=ev.deltaY>0?-ik.valrange.step:ik.valrange.step;
if(!ev.shiftKey)
delta*=5;
el.setValue(+el.value+delta);
ev.preventDefault();
ev.stopPropagation();
};
el.redraw=(f)=>{
if(f||ik.valueold!=el.value){
let v=(el.value-ik.valrange.min)/(ik.valrange.max-ik.valrange.min);
if(ik.sprites>=1)
el.style.backgroundPosition="0px "+(-((v*ik.sprites)|0)*ik.frameheight)+"px";
else{
switch(ik.itype){
case "k":
el.style.transform="rotate("+(270*v-135)+"deg)";
break;
case "h":
el.style.backgroundPosition=((w-h)*v)+"px 0px";
break;
case "v":
el.style.backgroundPosition="0px "+(h-w)*(1-v)+"px";
break;
}
}
ik.valueold=el.value;
}
};
el.refresh();
el.redraw(true);
el.addEventListener("keydown",ik.keydown);
el.addEventListener("mousedown",ik.pointerdown);
el.addEventListener("touchstart",ik.pointerdown);
el.addEventListener("wheel",ik.wheel);
}
let refreshque=()=>{
let elem=document.querySelectorAll("input.input-knob,input.input-slider");
for(let i=0;i<elem.length;++i)
procque.push([initKnobs,elem[i]]);
elem=document.querySelectorAll("input[type=checkbox].input-switch,input[type=radio].input-switch");
for(let i=0;i<elem.length;++i){
procque.push([initSwitches,elem[i]]);
}
}
let procque=[];
refreshque();
setInterval(()=>{
for(let i=0;procque.length>0&&i<8;++i){
let q=procque.shift();
q[0](q[1]);
}
if(procque.length<=0)
refreshque();
},50);
});