waybar/src/modules/workspaces.cpp

#include "modules/workspaces.hpp"
#include "ipc/client.hpp"

waybar::modules::Workspaces::Workspaces(Bar &bar)
  : _bar(bar), _scrolling(false)
{
  _box.get_style_context()->add_class("workspaces");
  std::string socketPath = get_socketpath();
  _ipcfd = ipc_open_socket(socketPath);
  _ipcEventfd = ipc_open_socket(socketPath);
  const char *subscribe = "[ \"workspace\" ]";
  uint32_t len = strlen(subscribe);
  ipc_single_command(_ipcEventfd, IPC_SUBSCRIBE, subscribe, &len);
  _thread = [this] {
    try {
      if (_bar.outputName.empty()) {
        // Wait for the name of the output
        while (_bar.outputName.empty())
          _thread.sleep_for(chrono::milliseconds(150));
      } else
        ipc_recv_response(_ipcEventfd);
      uint32_t len = 0;
      std::lock_guard<std::mutex> lock(_mutex);
      auto str = ipc_single_command(_ipcfd, IPC_GET_WORKSPACES, nullptr, &len);
      _workspaces = _getWorkspaces(str);
      Glib::signal_idle().connect_once(sigc::mem_fun(*this, &Workspaces::update));
    } catch (const std::exception& e) {
      std::cerr << e.what() << std::endl;
    }
  };
}

auto waybar::modules::Workspaces::update() -> void
{
  std::lock_guard<std::mutex> lock(_mutex);
  bool needReorder = false;
  for (auto it = _buttons.begin(); it != _buttons.end();) {
    auto ws = std::find_if(_workspaces.begin(), _workspaces.end(),
      [it](auto node) -> bool { return node["num"].asInt() == it->first; });
    if (ws == _workspaces.end()) {
      it = _buttons.erase(it);
      needReorder = true;
    } else
      ++it;
  }
  for (auto node : _workspaces) {
    if (_bar.outputName != node["output"].asString())
      continue;
    auto it = _buttons.find(node["num"].asInt());
    if (it == _buttons.end()) {
      _addWorkspace(node);
      needReorder = true;
    } else {
      auto &button = it->second;
      if (node["focused"].asBool())
        button.get_style_context()->add_class("current");
      else
        button.get_style_context()->remove_class("current");
      if (needReorder)
        _box.reorder_child(button, node["num"].asInt());
      button.show();
    }
  }
  if (_scrolling)
    _scrolling = false;
}

void waybar::modules::Workspaces::_addWorkspace(Json::Value node)
{
  auto pair = _buttons.emplace(node["num"].asInt(), node["name"].asString());
  auto &button = pair.first->second;
  _box.pack_start(button, false, false, 0);
  button.set_relief(Gtk::RELIEF_NONE);
  button.signal_clicked().connect([this, pair] {
    try {
      std::lock_guard<std::mutex> lock(_mutex);
      auto value = fmt::format("workspace \"{}\"", pair.first->first);
      uint32_t size = value.size();
      ipc_single_command(_ipcfd, IPC_COMMAND, value.c_str(), &size);
    } catch (const std::exception& e) {
      std::cerr << e.what() << std::endl;
    }
  });
  button.add_events(Gdk::SCROLL_MASK | Gdk::SMOOTH_SCROLL_MASK);
  button.signal_scroll_event()
    .connect(sigc::mem_fun(*this, &Workspaces::_handleScroll));
  _box.reorder_child(button, node["num"].asInt());
  if (node["focused"].asBool())
    button.get_style_context()->add_class("current");
  button.show();
}

bool waybar::modules::Workspaces::_handleScroll(GdkEventScroll *e)
{
  std::lock_guard<std::mutex> lock(_mutex);
  // Avoid concurrent scroll event
  if (_scrolling)
    return false;
  _scrolling = true;
  int id = -1;
  uint16_t idx = 0;
  for (; idx < _workspaces.size(); idx += 1)
    if (_workspaces[idx]["focused"].asBool()) {
      id = _workspaces[idx]["num"].asInt();
      break;
    }
  if (id == -1) {
    _scrolling = false;
    return false;
  }
  if (e->direction == GDK_SCROLL_UP)
      id = _getNextWorkspace();
  if (e->direction == GDK_SCROLL_DOWN)
      id = _getPrevWorkspace();
  if (e->direction == GDK_SCROLL_SMOOTH) {
    gdouble delta_x, delta_y;
    gdk_event_get_scroll_deltas ((const GdkEvent *) e, &delta_x, &delta_y);
    if (delta_y < 0)
      id = _getNextWorkspace();
    else if (delta_y > 0)
      id = _getPrevWorkspace();
  }
  if (id == _workspaces[idx]["num"].asInt()) {
    _scrolling = false;
    return false;
  }
  auto value = fmt::format("workspace \"{}\"", id);
  uint32_t size = value.size();
  ipc_single_command(_ipcfd, IPC_COMMAND, value.c_str(), &size);
  std::this_thread::sleep_for(std::chrono::milliseconds(150));
  return true;
}

int waybar::modules::Workspaces::_getPrevWorkspace()
{
  int current = -1;
  for (uint16_t i = 0; i != _workspaces.size(); i += 1)
    if (_workspaces[i]["focused"].asBool()) {
      current = _workspaces[i]["num"].asInt();
      if (i > 0)
        return _workspaces[i - 1]["num"].asInt();
      return _workspaces[_workspaces.size() - 1]["num"].asInt();
    }
  return current;
}

int waybar::modules::Workspaces::_getNextWorkspace()
{
  int current = -1;
  for (uint16_t i = 0; i != _workspaces.size(); i += 1)
    if (_workspaces[i]["focused"].asBool()) {
      current = _workspaces[i]["num"].asInt();
      if (i + 1U < _workspaces.size())
        return _workspaces[i + 1]["num"].asInt();
      return _workspaces[0]["num"].asInt();
    }
  return current;
}

Json::Value waybar::modules::Workspaces::_getWorkspaces(const std::string data)
{
  Json::Value res;
  try {
    std::string err;
    res = _parser.parse(data);
  } catch (const std::exception& e) {
    std::cerr << e.what() << std::endl;
  }
  return res;
}

waybar::modules::Workspaces::operator Gtk::Widget &() {
  return _box;
}