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Question

I have some QMenu objects that share some QAction 's between them and toolbars.

The detail here is that I want to reproduce some menu parts over other menus. For instance, in my QMainWindow object's MenuBar, I have something like

File
  (x) New
  (x) Open
  (x) Save
  (x) ------
  (x) Add Sketch...
  (-) Export...
  (-) Import...

And then, in some context menu, I want to reproduce the same exact structure with only the actions marked with (x) , using the same action objects. I want to do this over several menus.

The naive approach is to repeat the same code when building the QMainWindow menu and the context menu that repeats the structure. But this means repeating code and therefore doubling the maintenance effort (times the number of repeated menu actions).

Is there a direct approach of solving this on Qt?

Answer 1

One option can be to have the actions stored in a dictionary, and then save different lists of keys for each submenu. All you have to do later is just to build the menu using a simple for. A draft code may look like:

QMap<QString, QAction*> actions;
actions["new"] = new QAction(...); // connect, etc.
actions["-"] = new QAction(...); // for separator

QMap<QString, QStringList> menus;
menus["file"] << "new" << "save" << ... << "import" << ...;
menus["context1"] << "new" << "save" << ...;

QMenu* buildMenu(const QString& name) {
  if (!menus.contains(name)) return nullptr;
  auto menu = new QMenu();
  Q_FOREACH (const auto& entry, menus[name]) {
    menu->addAction(actions[entry]);
  }
  return menu;
}

Finally, make actions and menus available to buildMenu (a class, anonymous namespace together some initialisation...). Also remember to delete the returned menu after using it.