private void ApplyUndoRedoState(UndoRedoState state)
{
switch (state.Type)
{
case UndoRedoType.FileValues:
this.PasteValuesToCurrentFile(state.Values);
break;
default:
throw new NotSupportedException(String.Format("Unhandled undo/redo state type {0}.", state.Type));
}
}
public void UndoRedo()
{
// zero states
UndoRedoChain undoRedoChain = new UndoRedoChain();
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsFalse(undoRedoChain.CanUndo);
UndoRedoState state;
Assert.IsFalse(undoRedoChain.TryGetRedo(out state));
Assert.IsFalse(undoRedoChain.TryGetUndo(out state));
// basic lifecycle with two different states
FileDatabase fileDatabase = this.CreateFileDatabase(TestConstant.File.DefaultTemplateDatabaseFileName, TestConstant.File.DefaultNewFileDatabaseFileName);
this.PopulateDefaultDatabase(fileDatabase);
ImageRow firstFile = fileDatabase.Files[0];
ImageRow secondFile = fileDatabase.Files[1];
undoRedoChain.AddStateIfDifferent(firstFile);
undoRedoChain.AddStateIfDifferent(secondFile);
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsTrue(undoRedoChain.CanUndo);
Assert.IsTrue(undoRedoChain.TryGetUndo(out state));
Assert.IsTrue(undoRedoChain.CanRedo);
Assert.IsFalse(undoRedoChain.CanUndo);
Assert.IsTrue(undoRedoChain.TryGetRedo(out state));
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsTrue(undoRedoChain.CanUndo);
Assert.IsTrue(undoRedoChain.TryGetUndo(out state));
Assert.IsTrue(undoRedoChain.CanRedo);
Assert.IsFalse(undoRedoChain.CanUndo);
Assert.IsTrue(undoRedoChain.TryGetRedo(out state));
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsTrue(undoRedoChain.CanUndo);
Assert.IsFalse(undoRedoChain.TryGetRedo(out state));
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsTrue(undoRedoChain.CanUndo);
Assert.IsTrue(undoRedoChain.TryGetUndo(out state));
Assert.IsTrue(undoRedoChain.CanRedo);
Assert.IsFalse(undoRedoChain.CanUndo);
Assert.IsFalse(undoRedoChain.TryGetUndo(out state));
Assert.IsTrue(undoRedoChain.CanRedo);
Assert.IsFalse(undoRedoChain.CanUndo);
undoRedoChain.Clear();
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsFalse(undoRedoChain.CanUndo);
Assert.IsFalse(undoRedoChain.TryGetRedo(out state));
Assert.IsFalse(undoRedoChain.TryGetUndo(out state));
// one state
UndoRedoState firstState = new UndoRedoState(firstFile);
undoRedoChain.AddStateIfDifferent(firstFile);
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsTrue(undoRedoChain.CanUndo);
Assert.IsFalse(undoRedoChain.TryGetRedo(out state));
Assert.IsTrue(undoRedoChain.TryGetUndo(out state));
Assert.IsTrue(firstState.Equals(state));
undoRedoChain.AddStateIfDifferent(firstFile);
Assert.IsFalse(undoRedoChain.CanRedo);
Assert.IsFalse(undoRedoChain.TryGetRedo(out state));
Assert.IsTrue(undoRedoChain.TryGetUndo(out state));
Assert.IsTrue(firstState.Equals(state));
}
