Method onProcessMessage

src/app/ui/file_selector.cpp:185–230

protected:
  bool onProcessMessage(ui::Message* msg) override {
    switch (msg->type()) {
      case kOpenMessage:
        manager()->addMessageFilter(kKeyDownMessage, this);
        break;
      case kCloseMessage:
        manager()->removeMessageFilter(kKeyDownMessage, this);
        break;
      case kKeyDownMessage: {
        KeyMessage* keyMsg = static_cast<KeyMessage*>(msg);
        KeyScancode scancode = keyMsg->scancode();

#ifdef __APPLE__
        int unicode = keyMsg->unicodeChar();
        bool up = (msg->cmdPressed() && scancode == kKeyUp);
        bool enter = (msg->cmdPressed() && scancode == kKeyDown);
        bool back = (msg->cmdPressed() && msg->shiftPressed() && unicode == '[');
        bool forward = (msg->cmdPressed() && msg->shiftPressed() && unicode == ']');
#else
        bool up = (msg->altPressed() && scancode == kKeyUp);
        bool enter = (msg->altPressed() && scancode == kKeyDown);
        bool back = (msg->altPressed() && scancode == kKeyLeft);
        bool forward = (msg->altPressed() && scancode == kKeyRight);
#endif

        if (up) {
          m_filesel->goUp();
          return true;
        }
        if (enter) {
          m_filesel->goInsideFolder();
          return true;
        }
        if (back) {
          m_filesel->goBack();
          return true;
        }
        if (forward) {
          m_filesel->goForward();
          return true;
        }
        return false;
      }
    }
    return Widget::onProcessMessage(msg);
  }

private:
  FileSelector* m_filesel;