C++ (Cpp) TextEditor::CanUndo Examples

Example #1

File: EditorCommands.cpp Project: jasonLaster/gecko-dev

NS_IMETHODIMP
UndoCommand::IsCommandEnabled(const char* aCommandName,
                              nsISupports* aCommandRefCon, bool* aIsEnabled) {
  if (NS_WARN_IF(!aIsEnabled)) {
    return NS_ERROR_INVALID_ARG;
  }

  *aIsEnabled = false;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  if (!textEditor->IsSelectionEditable()) {
    return NS_OK;
  }
  *aIsEnabled = textEditor->CanUndo();
  return NS_OK;
}