//this is called when an event is leaving the future events stack (aka Redo)
private void OnFutureEventsPop()
{
CustomChangeArgs args = _futureEvents.Pop(); //Pop the last event from the future events stack
MainTextBox.Text = args.Redo(MainTextBox.Text); //Apply the event to our text
OnPastEventsPush(args, false); //Push the event back to the past events stack
OnStackChange();
}
//Ths is called when an event is leaving the past events stack (aka Undo)
private void OnPastEventsPop()
{
CustomChangeArgs args = _pastEvents.Pop(); //Grab the last event
MainTextBox.Text = args.Undo(MainTextBox.Text); //Apply it to our text
OnFutureEventsPush(args); //Push it onto the future events stack
OnStackChange();
}
//This is called when an event is entering the past events stack
private void OnPastEventsPush(CustomChangeArgs args, bool isNew)
{
_pastEvents.Push(args);
if (isNew) //We use a bool to determine if the event is new (user hit a key, not undo/redo)
{
_futureEvents.Clear(); //If its a new input event, we need to clear the future events stack since
}
//we've branched off from our previous timeline.
OnStackChange();
}
//This is called when an event enters the future events stack (aka Undo)
private void OnFutureEventsPush(CustomChangeArgs args)
{
_futureEvents.Push(args); //Just add the event to the stack and update
OnStackChange();
}