Delete proxy and total samples, which have bit-rotted.

samples/total/client/ContextMenu.dart

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-typedef bool EnabledFunction();
-typedef void CallbackFunction(Element elmt, int value);
-
-class ElementFunc {
-  Element _element;
-  EnabledFunction _func;
-
-  Element get element() => _element;
-
-  EnabledFunction get func() => _func;
-
-  ElementFunc(this._element, this._func) { }
-}
-
-class ContextMenu {
-  Element _contextMenu;
-  List<ElementFunc> _enableFunctions;
-  Element _parent;
-  Spreadsheet _spreadsheet;
-  SpreadsheetPresenter _spreadsheetPresenter;
-
-  Element get parent() => _parent;
-
-  ContextMenu(this._spreadsheetPresenter) {
-    Document doc = document;
-    _contextMenu = new Element.tag("ul");
-    _contextMenu.style.setProperty("left","0px");
-    _contextMenu.style.setProperty("top", "0px");
-    _contextMenu.classes.add("contextMenu");
-    _contextMenu.classes.add("fadeOut");
-
-    // Parent off the document body to avoid problems when the menu
-    // extends past the border of its owner spreadsheet
-    _parent = doc.body;
-    _parent.nodes.add(_contextMenu);
-    _spreadsheet = _spreadsheetPresenter.spreadsheet;
-  }
-
-  Element addMenuItem(String label, int value,
-      EnabledFunction enabled, CallbackFunction callback) {
-    Element item = new Element.tag("li");
-    item.classes.add("contextMenuItem");
-    item.classes.add("contextMenuItem-enabled");
-    item.innerHTML = label;
-    item.on.click.add((Event e) {
-      _spreadsheetPresenter.popdownMenu(_contextMenu, value, callback);
-    });
-    _contextMenu.nodes.add(item);
-    if (_enableFunctions == null) {
-      _enableFunctions = new List<ElementFunc>();
-    }
-    _enableFunctions.add(new ElementFunc(item, enabled));
-    return item;
-  }
-
-  // Display the popup at the given coordinates
-  void show(int x, int y) {
-    // Enable or disable the menu items
-    _enableFunctions.forEach((ElementFunc elementFunc) {
-      _enableMenuItem(elementFunc.element, (elementFunc.func)());
-    });
-    _spreadsheetPresenter.popupMenu(_contextMenu, x, y);
-  }
-
-  // Enable or disable a particular menu item
-  void _enableMenuItem(Element item, bool enabled) {
-    if (enabled) {
-      item.classes.remove("contextMenuItem-disabled");
-      item.classes.add("contextMenuItem-enabled");
-    } else {
-      item.classes.remove("contextMenuItem-enabled");
-      item.classes.add("contextMenuItem-disabled");
-    }
-  }
-}