[Qgis-developer] How to stopediting/rollback in a plugin before changing the project-file

[bjsvwpfe]

Hi everybody,

I'm working on a plugin in which the user is editing a database-layer.
So I'm loading automatically a project with all the necessary layers.
The layer to be edited is already switched editable.
When the user closes the plugin the changes in the edited layer are saved
automatically.
You see we are doing everything for our users :-)
But now my problem. If the user clicks by mistake the "load new Project"
button and then doesn't save the project (I know this is not very supposable
:thinking:) I want to rollback the edited layer or save the changes.
But how to do this? The only possibility I found is to listen on the
triggered() SIGNAL of the actionNewProject().

QObject.connect(self.iface.actionNewProject(),SIGNAL("triggered(bool)"),self.deleteRubberBand)

# Entfernt das RubberBand
  def deleteRubberBand(self,rubberLayer="default"):
    if (rubberLayer == False): # The triggered Signal sents False
      self.layer.rollBack() #This is the layer I want to save/rollback
    for value in self.mRubberBand:
      value.reset()

But when the signal was sent, it is to late, my QgsVectorLayer doesn't exist
anymore.
So how can I save/rollback the edited layer before everything is deleted?
Maybe there is sth like a closeProject Signal respectively what happens when
the user clicks the discard button in the "save the current project" dialog?

I hope you understand what I want to do
Any hints would be great.

Best regards

Michael
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