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Editing: dynamic_SVG_example.html

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Dynamic SVG</title>
</head>
<body>
  <p>
    This page is an example of HTML/JS interacting with the lstopo SVG output.
  </p>
  <p>
    Load a SVG that was exported with lstopo's <b>native</b> SVG backend
    (e.g. with <tt>lstopo --of nativesvg foo.svg</tt>):
  </p>
  <input type="file" name="myFile" accept=".svg" onchange="openFile(event)">
  <br>
  <br>
  <object id="img" type="image/svg+xml">
  </object>
  <br>
  <p id='caption' style='display:none'>
    Click on a box to change its background color
    and replace its first text line (if any) with its SVG object id.
  </p>
  <p id='drag' style='display:none'>
    <input type='checkbox' id='draggable' onclick='enableDrag()'>Make boxes draggable</input>
  </p>
</body>
<footer>
	<script type="text/javascript">
	  function openFile(event) {
	      let image = document.getElementById('img')
	      image.data = null
	      var input = event.target;
	      var TextReader = new FileReader()
	      TextReader.onload = async function(){
		  var parser = new DOMParser()
		  let blob = new Blob([TextReader.result], {type: 'image/svg+xml'})
		  let url = URL.createObjectURL(blob)
		  image.data = await url
		  setTimeout(function(){
		      document.getElementById('caption').style = ''
		      document.getElementById('drag').style = ''
		      document.getElementById("draggable").checked = false

svgObject = document.getElementById('img').contentDocument
		      let svgElement = svgObject.getElementById('Machine_0_rect')

if(svgObject.getElementById('Machine_0_rect')){
			  start(svgObject)
		      }else{
			  const h1 = document.createElement('h1')
			  h1.innerHTML = "Your svg file doesn't have the good format to load javascript"
			  document.body.appendChild(h1)
		      }
		  },200)
	      }
	      TextReader.readAsText(input.files[0], "UTF-8")
	  }

function enableDrag(){
	      let svgObject = document.getElementById('img').contentDocument
	      const elements = svgObject.getElementsByTagName('rect')
	      for (let element of elements) {
		  element.classList.toggle("draggable")
	      }
	  }

function start(svgObject){
	      makeDraggable(svgObject)
	      const texts = svgObject.getElementsByTagName('text')
	      for (let text of texts) {
		  text.setAttribute("style", text.getAttribute("style") + ";pointer-events:none;")
	      }

const elements = svgObject.getElementsByTagName('rect')
	      for (let element of elements) {
		  if(!element.id.includes("Bridge")){
		      element.addEventListener('click', function(e) {
			  changeColor(svgObject, e.target)
			  changeText(svgObject, e.target)
		      })
		  }
	      }
	  }

function changeColor(svgObject, element){
	      oldColor = element.getAttribute("saveColor")

if(!oldColor){
		  element.setAttribute("saveColor", element.getAttribute("fill"))
		  element.setAttribute("fill", "red")
	      }else{
		  element.setAttribute("fill", oldColor)
		  element.removeAttribute("saveColor")
	      }
	  }

function changeText(svgObject, element){
	      if(element.id == "")
		  return
	      const text = svgObject.getElementById(element.id.replace('rect', 'text'))

let textContent = element.getAttribute("saveText")

if(!textContent){
		  element.setAttribute("saveText", text.innerHTML)
		  textContent = element.id
	      }else{
		  element.removeAttribute("saveText")
	      }

let svg   = svgObject.documentElement;
	      let svgNS = svg.namespaceURI;
	      let newText = text.cloneNode(false)

newText.appendChild(svgObject.createTextNode(textContent))
	      svg.removeChild(text)
	      svg.appendChild(newText)
	  }

function makeDraggable(svgObject) {
	      let selectedElement = null
	      let text = null
	      let marginTextX = null
	      let marginTextY = null
	      svgObject.addEventListener('mousedown', startDrag)
	      svgObject.addEventListener('mousemove', drag)
	      svgObject.addEventListener('mouseup', endDrag)
	      svgObject.addEventListener('mouseleave', endDrag)

function startDrag(evt) {
		  if (evt.target.classList.contains('draggable')) {
		      selectedElement = evt.target;
		      text = getText(svgObject, selectedElement.id)
		      marginTextX = text.getAttribute("x") - selectedElement.getAttribute("x")
		      marginTextY = text.getAttribute("y") - selectedElement.getAttribute("y")
		  }
	      }

function drag(evt) {
		  if (selectedElement) {
		      evt.preventDefault();
		      let textDragX = evt.clientX + marginTextX
		      let textDragY = evt.clientY + marginTextY
		      let dragX = evt.clientX;
		      let dragY = evt.clientY;

selectedElement.setAttribute("x", dragX);
		      selectedElement.setAttribute("y", dragY);
		      text.setAttribute("x", textDragX);
		      text.setAttribute("y", textDragY);
		  }
	      }

function endDrag(evt) {
		  selectedElement = null
	      }
	  }
    </script>
</footer>
</html>

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