File browser

/* Status and element functions. */
var e = function(tag,index){ return demotab.getElementsByTagName(tag)[index||0]; };
var status = function(msg) {
  if (!msg) return e('p').style.display = 'none';
  e('p').style.display = '';
  e('p').innerHTML = msg;
};
 
/* File browser implementation singleton. */
var filebrowser = window.filebrowser = {
 
  // Setup the demo
  init: function() {
    var self = this;
 
    // Setup the "up" link
    e('a').onclick = function(evt) {
      if (!evt) evt = window.event;
      evt.cancelBubble = true;
      if (evt.stopPropagation) evt.stopPropagation();
      var result = trephine.js( function(path) {
        return (new java.io.File(path)).parent + '';
      }, e('input').value );
      if (result.error) throw "Error: " + result.error;
      self.show(result.result.toString() + '');
      return false;
    };
 
    // Setup the path text box (when Enter is pressed, reload)
    var input = e('input');
    input.onkeyup = function(evt) {
      var event = evt || window.event, code = event.keyCode;
      if (code == 13) return self.show(input.value);
    };
 
    // Setup the browse button
    e('input', 1).onclick = function(evt) {
      var result = trephine.js( function() {
        (new java.lang.Thread(new java.lang.Runnable({
          run: function() {
            var p = function(s){ java.lang.System.out.println(s); };
            p("filebrowser::browse - START [" + java.lang.Thread.currentThread() + "]" );
            var dialog = new java.awt.FileDialog(
              new java.awt.Frame(),
              "Choose a directory",
              java.awt.FileDialog.LOAD
            ); 
            p("filebrowser::browse - showing FileDialog" );
            dialog.show();
            p("filebrowser::browse - dialog closed, directory = " + dialog.directory + "");
            var re = function(s){ return new RegExp(s,'g'); };
            var path = (dialog.directory + '').replace(re('([\'"\\\\])'), '\\\\\\$1');
            p("filebrowser::browse - calling window.eval() to trigger filebrowser.show(path)");
            window.eval("setTimeout('window.top.filebrowser.show(\"" + path + "\")', 10)");
            p("filebrowser::browse - DONE!");
          }
        }))).start();
        return true;
      } );
      if (result.error) throw "Error: " + result.error;
    };
 
    // Determine OS specific path separator
    var result = trephine.js( function() { return java.io.File.separator + ''; } );
    this.separator = result.result.toString() + '' || '/';
 
    // Initialize path text input box
    var result = trephine.js( function() { return java.lang.System.getProperty('user.home') + ''; } );
    if (result.error) throw "Error: " + result.error;
    this.show(result.result.toString() + '');
  },
 
  // Show a given directory's contents
  show: function(dir) {
    var self = this;
    e('input').value = dir;
    var result = trephine.js( function(path) {
      var dir = new java.io.File(path);
      if (!dir.isDirectory()) throw "Path [" + path + "] is not a directory";
      if (!dir.canRead()) throw "Path [" + path + "] is not readable";
      var list = dir.listFiles(), files = [], subdirs = [], buf = [];
      for (var i=0; i<list.length; i++) {
        if (list[i].isDirectory()) subdirs[subdirs.length] = list[i].getName() + '';
        else files[files.length] = list[i].getName() + '';
      }
      subdirs.sort();
      files.sort();
      var symbols = {};
      symbols['"'] = '&quot;';
      symbols['<'] = '&lt;';
      symbols['>'] = '&gt;';
      symbols['&'] = '&amp;';
      var htmlspecialchars = function(str) {
        var buf = (str + '').split('');
        for (var i=0; i<buf.length; i++) buf[i] = symbols[buf[i]] || buf[i];
        return buf.join('');
      };
      for (var i=0; i<subdirs.length; i++) {
        var name = htmlspecialchars(subdirs[i]);
        buf[buf.length] = ['<a href="" title="', name, '">', name, '</a>'].join('');
      };
      for (var i=0; i<files.length; i++) {
        buf[buf.length] = htmlspecialchars(files[i]);
      };
      return ['<ul><li>', buf.join('</li><li>'), '</li></ul>'].join('');
    }, e('input').value );
    if (result.error) e('div').innerHTML = "<p class=\"error\">Error: " + result.error.getMessage() + "</p>";
    e('div').innerHTML = result.result.toString() + '';
    var elems = e('div').getElementsByTagName('a');
    for (var i=0; i<elems.length; i++) (function(a){
      a.onclick = function(evt) {
        if (!evt) evt = window.event;
        evt.cancelBubble = true;
        if (evt.stopPropagation) evt.stopPropagation();
        self.show(dir + self.separator + a.title);
        return false;
      };
    })(elems[i]);
  }
};
 
/* Load trephine */
status('<span class="spinner"></span> Loading trephine...');
trephine.load({
  debug: true, // Enables debug logging to the Java Console
  engines: ['js'], // Initialize the JavaScript engine as soon as possible
  onload: function() { // Immediately prompt for permissions
    status('<span class="spinner"></span> Asking for elevated permissions...');
    trephine.askPermission( function(response) {
      if (!response) { // Short-circuit if permission request was denied
        return demotab.innerHTML = '<div class="error">Sorry, you must grant trephine privileges to enjoy this demo.</div>';
      }
      status('Permission request granted.');
      setTimeout( function(){ status(); }, 2000 );
      filebrowser.init();
    } );
  }
});