public void TestCommandHistory()
{
PositiveInt x = new PositiveInt();
CommandHistory test = new CommandHistory();
// test initial state
Assert.IsTrue(!test.CanUndo);
Assert.IsTrue(!test.CanRedo);
Assert.IsTrue(!test.Dirty);
// test adding command
Command cmd = new IncCommand(x);
test.Add(cmd);
cmd.Do();
Assert.IsTrue(x.Value == 1);
Assert.IsTrue(test.CanUndo);
Assert.IsTrue(!test.CanRedo);
Assert.IsTrue(test.Dirty);
test.Undo();
Assert.IsTrue(x.Value == 0);
Assert.IsTrue(!test.CanUndo);
Assert.IsTrue(test.CanRedo);
Assert.IsTrue(!test.Dirty);
test.Redo();
Assert.IsTrue(x.Value == 1);
Assert.IsTrue(test.CanUndo);
Assert.IsTrue(!test.CanRedo);
Assert.IsTrue(test.Dirty);
test.Dirty = false;
Assert.IsTrue(!test.Dirty);
cmd = new IncCommand(x);
test.Add(cmd);
cmd.Do();
Assert.IsTrue(test.Dirty);
test.Undo();
Assert.IsTrue(!test.Dirty);
test.Dirty = true;
Assert.IsTrue(test.Dirty);
}
/// <summary>
/// Reverts the command count by undoing or redoing to the "clean" point</summary>
/// <param name="history">Command history to undo or redo</param>
/// <remarks>Use this method to revert in a multi-document, single command history scenario</remarks>
public void Revert(CommandHistory history)
{
// need to undo?
while (m_clean < m_current)
{
if (!history.CanUndo)
{
break;
}
history.Undo();
}
// need to redo?
while (m_clean > m_current)
{
if (!history.CanRedo)
{
break;
}
history.Redo();
}
}
/// <summary>
/// Reverts the command count by undoing or redoing to the "clean" point</summary>
/// <param name="history">Command history to undo or redo</param>
/// <remarks>Use this method to revert in a multi-document, single command history scenario</remarks>
public void Revert(CommandHistory history)
{
// need to undo?
while (m_clean < m_current)
{
if (!history.CanUndo)
break;
history.Undo();
}
// need to redo?
while (m_clean > m_current)
{
if (!history.CanRedo)
break;
history.Redo();
}
}
/// <summary>
/// Constructor</summary>
public HistoryContext()
{
History = new CommandHistory();
}