<!DOCTYPE html>
<title>drag &amp; drop - file drop for large file</title>
<style>
  body > div {
    height: 200px;
    width: 200px;
    background-color: orange;
  }
</style>

<script>
//JavaScript can support file sizes up to 9007199254740992 bytes ... in theory
//This test uses a more sane value, just for the sake of UI testing - 32 MB
var filesize1 = 33554432, filesize2 = 134217728;
var fails = [], finished = false;
window.onload = function() {
  var orange = document.getElementsByTagName('div')[0];
  orange.ondragover = orange.ondragenter = function(e) {
    e.preventDefault();
    e.dataTransfer.dropEffect = 'copy';
    if( !e.dataTransfer.files ) {
      fails[fails.length] = 'No dataTransfer.files for '+e.type;
    }
    if( !window.FileList ) {
      fails[fails.length] = 'No FileList interface object';
      return;
    }
    if( !( e.dataTransfer.files instanceof FileList ) ) {
      fails[fails.length] = 'dataTransfer.files is not a FileList';
    }
    if( e.dataTransfer.files.length ) {
      fails[fails.length] = 'dataTransfer.files.length is '+e.dataTransfer.files.length+' instead of 0 for '+e.type;
    }
  };
  orange.ondrop = function(e) {
    e.preventDefault();
    if( !e.dataTransfer.files ) {
      fails[fails.length] = 'No dataTransfer.files for '+e.type;
    }
    if( !window.FileList ) {
      fails[fails.length] = 'No FileList interface object';
      finish();
      return;
    }
    if( !( e.dataTransfer.files instanceof FileList ) ) {
      fails[fails.length] = 'dataTransfer.files is not a FileList';
    }
    if( e.dataTransfer.files.length != 1 ) {
      fails[fails.length] = 'dataTransfer.files.length is '+e.dataTransfer.files.length+' instead of 1 for '+e.type;
    }
    if( !e.dataTransfer.files[0] ) {
      fails[fails.length] = 'no dataTransfer.files[0] for drop';
      finish();
      return;
    }
    if( e.dataTransfer.files[0].size != filesize1 && e.dataTransfer.files[0].size != filesize2 ) {
      fails[fails.length] = 'dataTransfer.files[0].size '+e.dataTransfer.files[0].size+' instead of '+filesize1+' or '+filesize2;
    }
    /*
    if( !e.dataTransfer.files[0].lastModified ) {
      fails[fails.length] = 'no dataTransfer.files[0].lastModified';
    }
    */
    if( !window.FileReader ) {
      fails[fails.length] = 'No FileReader constructor';
      finish();
      return;
    }
    var reader = new FileReader();
    reader.readAsBinaryString(e.dataTransfer.files[0]);
    reader.onload = function () {
      if( !reader.result ) {
        fails[fails.length] = 'No file data after load';
      }
      if( reader.result.length != filesize1 && reader.result.length != filesize2 ) {
        fails[fails.length] = 'File data length '+reader.result.length+' instead of '+filesize1+' or '+filesize2;
      }
      finish();
    };
    setTimeout(function () {
      if( !reader.result ) {
        fails[fails.length] = 'No file data after timeout';
      }
      finish();
    },1000);
  };

};
function finish() {
  if( finished ) { return; }
  finished = true;
  document.getElementsByTagName('p')[0].innerHTML = fails.length ? ( 'FAIL: ' + fails.join('<br>') ) : 'PASS if the UI did not lock up';
}
</script>

<div></div>

<p>Save <a href="../resources/32mb.py">32MB.txt</a> to your desktop. Use your pointing device to drag the saved file from your desktop onto the orange box, and release it. If a confirmation dialog appears, accept it. Fail if this text is not replaced with a pass message. Fail if the UI locks up immediately after dropping the file.</p>
<noscript><p>Enable JavaScript and reload</p></noscript>
