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

samples/total/client/UndoableAction.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.
-
-/**
- * The [UndoableAction] interface must be implemented by classes that store undo/redo data for
- * the [GeneralCommand] class and its subclasses.
- */
-interface UndoableAction {
-  /**
-   * Undo the effect of the action on the given spreadsheet.
-   */
-  void undoAction(Spreadsheet spreadsheet);
-}
-
-/**
- * The [CellAction class] represents an action on a cell at a given location.
- */
-class CellAction implements UndoableAction {
-  // The location of the cell that has changed
-  RowCol _rowCol;
-
-  CellAction(this._rowCol) {}
-
-  // Apply does nothing
-  void undoAction(Spreadsheet spreadsheet) {}
-}
-
-/**
- * A class to hold a change to the content of a [Cell].
- */
-class CellContentAction extends CellAction {
-  // The old content
-  CellContent _originalContent;
-
-  CellContentAction(RowCol rowCol, this._originalContent) : super(rowCol) {}
-
-  void undoAction(Spreadsheet spreadsheet) {
-    spreadsheet.setCellContent(_rowCol, _originalContent);
-  }
-}
-
-/**
- * A class to hold a change to the style of a [Cell].
- */
-class CellStyleAction extends CellAction {
-  // The old style
-  Style _originalStyle;
-
-  CellStyleAction(RowCol rowCol, this._originalStyle) : super(rowCol) {}
-
-  void undoAction(Spreadsheet spreadsheet) {
-    if (_originalStyle == null) {
-      Cell c = spreadsheet.getCell(_rowCol);
-      if (c != null) {
-        spreadsheet.setCellStyle(_rowCol, null);
-      }
-    } else {
-      spreadsheet.setCellStyle(_rowCol, _originalStyle);
-    }
-  }
-}
-
-/**
- * A class to hold a change to a row, column or entire sheet.
- */
-class RowColAction implements UndoableAction {
-  // The index of the row or column that has changed
-  int _index;
-
-  // One of Spreadsheet.ROW, Spreadsheet.COL, or Spreadsheet.SHEET.
-  int _rowOrCol;
-
-  RowColAction(this._index, this._rowOrCol) {}
-
-  // Apply does nothing
-  void undoAction(Spreadsheet spreadsheet) {}
-}
-
-/**
- * A class to hold a change to a row, column or spreadsheet style
- */
-class RowColStyleAction extends RowColAction {
-  // The original style before the delta is applied
-  RowColStyle _originalStyle;
-
-  RowColStyleAction(int index, int rowOrCol, this._originalStyle) : super(index, rowOrCol) {}
-
-  void undoAction(Spreadsheet spreadsheet) {
-    if (_rowOrCol == Spreadsheet.ROW) {
-      spreadsheet.setRowStyle(_index, _originalStyle);
-    } else if (_rowOrCol == Spreadsheet.COL) {
-      spreadsheet.setColumnStyle(_index, _originalStyle);
-    } else {
-      spreadsheet.setSheetStyle(_originalStyle);
-    }
-  }
-}