/// <summary>
/// Performs the code func inside an undoable period guarded by the command specified. Use this method if the code to run inside the
/// undoable period is well known and can be wrapped inside a single func. The func codeToExecuteInPeriodFunc is executed once, all
/// undo/redo logic is done by undo/redo-ing commands which were ran due to state changes caused by codeToExecuteInPeriodFunc.
/// If you want to run a command again during redo, you should enqueue and run a normal command instead of using this method.
/// To create an undoable period, you can also call BeginUndoablePeriod and EndUndoablePeriod.
/// </summary>
/// <param name="cmd">The CMD.</param>
/// <param name="codeToExecuteInPeriodFunc">The code to execute in period func.</param>
public void PerformUndoablePeriod(UndoablePeriodCommand cmd, Action codeToExecuteInPeriodFunc)
{
ArgumentVerifier.CantBeNull(cmd, "cmd");
ArgumentVerifier.CantBeNull(codeToExecuteInPeriodFunc, "codeToExecuteInPeriod");
// reset before/after do action as BeginUndoablePeriod will execute the command (which is empty) but will still perform the before/after actions
// resetting them to null will avoid that
Action beforeDoActionSafe = cmd.BeforeDoAction;
Action afterDoActionSafe = cmd.AfterDoAction;
cmd.BeforeDoAction = null;
cmd.AfterDoAction = null;
try
{
ThreadEnter();
BeginUndoablePeriod(cmd);
// set them back.
cmd.BeforeDoAction = beforeDoActionSafe;
cmd.AfterDoAction = afterDoActionSafe;
if (cmd.BeforeDoAction != null)
{
cmd.BeforeDoAction();
}
codeToExecuteInPeriodFunc();
if (cmd.AfterDoAction != null)
{
cmd.AfterDoAction();
}
EndUndoablePeriod(cmd);
}
finally
{
ThreadExit();
}
}
/// <summary>
/// Sets the command manager in a special mode where all subsequential commands are tracked inside an UndoablePeriodCommand which, when undone/redone
/// will not destroy its command queue during undo and won't accept new commands when redone, which is useful when you want to mark a method as an
/// undoable piece of code and the method creates objects, which can be a problem with a normal command calling the method because the objects created
/// inside the method are re-created (so you'll get new instances) when the command is redone. If follow up commands work on the instances, redoing these
/// commands as well causes a problem as they'll work on objects which aren't there.
/// </summary>
/// <param name="cmd">The command to use for the undoableperiod.</param>
public void BeginUndoablePeriod(UndoablePeriodCommand cmd)
{
try
{
ThreadEnter();
ArgumentVerifier.CantBeNull(cmd, "cmd");
EnqueueAndRunCommand(cmd);
}
finally
{
ThreadExit();
}
}
/// <summary>
/// Ends the undoable period started with BeginUndoablePeriod.
/// </summary>
/// <param name="cmd">The command used for the undoable period.</param>
public void EndUndoablePeriod(UndoablePeriodCommand cmd)
{
try
{
ThreadEnter();
ArgumentVerifier.CantBeNull(cmd, "cmd");
// the period has ended, so we've to pop the queue of the period from the stack.
cmd.PopCommandQueueFromActiveStackIfRequired();
}
finally
{
ThreadExit();
}
}
/// <summary>
/// Performs the code func inside an undoable period guarded by the command specified. Use this method if the code to run inside the
/// undoable period is well known and can be wrapped inside a single func. The func codeToExecuteInPeriodFunc is executed once, all
/// undo/redo logic is done by undo/redo-ing commands which were ran due to state changes caused by codeToExecuteInPeriodFunc.
/// If you want to run a command again during redo, you should enqueue and run a normal command instead of using this method.
/// To create an undoable period, you can also call BeginUndoablePeriod and EndUndoablePeriod.
/// </summary>
/// <param name="cmd">The CMD.</param>
/// <param name="codeToExecuteInPeriodFunc">The code to execute in period func.</param>
public void PerformUndoablePeriod(UndoablePeriodCommand cmd, Action codeToExecuteInPeriodFunc)
{
try
{
ThreadEnter();
ArgumentVerifier.CantBeNull(cmd, "cmd");
ArgumentVerifier.CantBeNull(codeToExecuteInPeriodFunc, "codeToExecuteInPeriod");
BeginUndoablePeriod(cmd);
if (cmd.BeforeDoAction != null)
{
cmd.BeforeDoAction();
}
codeToExecuteInPeriodFunc();
if (cmd.AfterDoAction != null)
{
cmd.AfterDoAction();
}
EndUndoablePeriod(cmd);
}
finally
{
ThreadExit();
}
}
