index.html Example File

webkitwidgets/imageanalyzer/resources/index.html

  <html>
      <body>
          <div style="float:right; width:50%; border-left: solid 1px black">
              <div id="listdiv" align="center">
                  <h5>Images to be analyzed:</h5>
                  <select multiple size=10 id=imglist style="width:80%"></select>
                  <br />
                  <input type="button" id="evalbutton" value="Analyze" onclick="analyzeImages()" />
              </div>
          </div>
          <div style="width:50%">
              <div id="titleblock" align="center">
                  <h2>Image Analyzer</h2>
              </div>
              <div id=outputdiv align=center>
                  <h4>Status: <span id=status>Idle</span></h4>
                  <h5>
                      Latest Results:<br />
                      Red: <span id=redval style="color:red">n/a</span><br />
                      Green: <span id=greenval style="color:green">n/a</span><br />
                      Blue: <span id=blueval style="color:blue">n/a</span><br />
                  </h5>
                  <h3>Click on images below to select for analysis</h3>
              </div>
          </div>
          <div id=imagediv style="clear:both; text-align:center">
          <hr/>
              <img src="images/mtRainier.jpg" height=150px onclick='return addImage(this);' />
              <img src="images/bellaCoola.jpg" height=150px onclick='return addImage(this);'/>
              <img src="images/seaShell.jpg" height=150px onclick='return addImage(this);'/>
              <img src="images/flower.jpg" height=150px onclick='return addImage(this);'/>
              <img src="images/trees.jpg" height=150px onclick='return addImage(this);'/>
          </div>

      </body>
  </html>

  <script type="text/javascript">
      var remaining = 0;
      var connected = false;
      //We use this function because connect statements resolve their target once, imediately
      //not at signal emission so they must be connected once the imageAnalyzer object has been added to the frame
      //! <!--  [ connect slots ] -->
      function connectSlots()
      {
          if ( !connected ) {
              connected = true;
              imageAnalyzer.finishedAnalysis.connect(this, finished);
              imageAnalyzer.updateProgress.connect(this, updateProg);
          }
      }
      //! <!--  [ connect slots ] -->

      function finished() {
          setStatus('Idle');
          setResults(imageAnalyzer.red.toFixed(2), imageAnalyzer.green.toFixed(2), imageAnalyzer.blue.toFixed(2));
      }
      //This will function as the recieving "slot" for the progress signal
      function updateProg(complete, max)
      {
          var oldRemaining = remaining;
          remaining = max - complete;
          pullList(oldRemaining - remaining);
          //Prevent results getting messed up if we don't get signals in order
          if( imageAnalyzer.busy ) {
              setStatus('Processing (' + complete + ' of ' + max + ' completed)');
              setResults('Calculating','Calculating','Calculating');
          }
      }

  //! <!--  [ analyzeImages ] -->
  function analyzeImages() {
      connectSlots();
      var imglist = document.getElementsByTagName('option');
      if (imglist.length > 0) {
          stringlist = [];
          for(var i=0; i<imglist.length; i++) {
              stringlist[i]=imglist[i].value;
          }
          if (!imageAnalyzer.busy) {
              remaining = stringlist.length;
              imageAnalyzer.startAnalysis(stringlist);
          } else {
              alert("Processing, please wait until finished.");
          }
  //! <!--  [ analyzeImages ] -->
      } else {
          alert('No images selected. Click on one or more images to select them for analysis.');
      }
  }
  function clearList() {
      var imglist = document.getElementById('imglist');
      while(imglist.length > 0) {
          imglist.removeChild(imglist.childNodes[0]);
      }
  }
  function pullList(count) {
      var imglist = document.getElementById('imglist');
      while(imglist.length > 0 && count > 0) {
          imglist.removeChild(imglist.childNodes[0]);
          count--;
      }
  }
  function setStatus(statusString) {
      document.getElementById('status').innerHTML = statusString;
  }

  function setResults(red, green, blue) {
      if (! isNaN(red) ) { red += " %"; }
      if (! isNaN(green) ) { green += " %"; }
      if (! isNaN(blue) ) { blue += " %"; }
      document.getElementById('redval').innerHTML = red;
      document.getElementById('greenval').innerHTML = green;
      document.getElementById('blueval').innerHTML = blue;
  }
  //! <!--  [ addImage ] -->
  function addImage(newimg) {
      var imglist = document.getElementById('imglist');
      var curChildren = imglist.childNodes;
      var newline = document.createElement('option');
      newline.innerHTML = newimg.src.substring(newimg.src.lastIndexOf('/')+1);
      newline.value = newimg.src;
      imglist.appendChild(newline);
  }
  //! <!--  [ addImage ] -->
  </script>