C++ (Cpp) TextEditor::IsEmpty Examples

Example #1

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

NS_IMETHODIMP
SelectAllCommand::IsCommandEnabled(const char* aCommandName,
                                   nsISupports* aCommandRefCon,
                                   bool* aIsEnabled) {
  NS_ENSURE_ARG_POINTER(aIsEnabled);

  nsresult rv = NS_OK;
  // You can always select all, unless the selection is editable,
  // and the editable region is empty!
  *aIsEnabled = true;

  nsCOMPtr<nsIEditor> editor = do_QueryInterface(aCommandRefCon);
  if (!editor) {
    return NS_OK;
  }

  // You can select all if there is an editor which is non-empty
  TextEditor* textEditor = editor->AsTextEditor();
  MOZ_ASSERT(textEditor);
  bool isEmpty = false;
  rv = textEditor->IsEmpty(&isEmpty);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return rv;
  }
  *aIsEnabled = !isEmpty;
  return NS_OK;
}