demo_02.cpp

#include <iostream>

#include "../xpp.hpp"
#include "../proto/randr.hpp"
#include "../proto/damage.hpp"
#include "../proto/render.hpp"

// typedefs for convenience
namespace x {
  typedef xpp::connection<xpp::randr::extension,
                          xpp::damage::extension,
                          xpp::render::extension>
                            connection;

  typedef xpp::event::registry<connection &,
                               xpp::randr::extension,
                               xpp::damage::extension,
                               xpp::render::extension>
                                 registry;

  typedef xpp::font<connection &> font;
  typedef xpp::cursor<connection &> cursor;
  typedef xpp::window<connection &> window;
  typedef xpp::window<xcb_connection_t *> xcb_window;
};

int main(int, char **)
{
  x::connection connection;
  x::registry registry(connection);

  // Print out all available font paths
  auto && paths = connection.get_font_path().path();
  std::cerr << "paths "
            << "(length: " << std::distance(paths.begin(), paths.end()) << "):"
            << std::endl;
  for (auto && path : paths) {
    std::cerr << "path [" << path.length() << "]: " << path << std::endl;
  }
  std::cerr << std::endl;

  // Print out all available fonts
  auto && fonts = connection.list_fonts(8, 1, "*").names();
  std::cerr << "fonts "
            << "(length: " << std::distance(fonts.begin(), fonts.end()) << "):"
            << std::endl;
  for (auto && name : fonts) {
    std::cerr << "font [" << name.length() << "]: " << name << std::endl;
  }
  std::cerr << std::endl;

  // Print all windows and their subwindows
  auto tree = connection.root<x::window>().query_tree();
  std::cerr << "children: " << std::endl;
  for (auto && child : tree.children<x::xcb_window>()) {
    std::cerr << child << " ";
    auto siblings = child.query_tree().children();
    auto siblings_length = std::distance(siblings.begin(), siblings.end());
    if (siblings_length > 0) {
      std::cerr << std::hex << "[" << siblings_length
                << " sibling" << (siblings_length > 1 ? "s" : "") << ": ";
      for (auto && sibling : siblings) {
        std::cerr << "0x" << sibling << (--siblings_length > 0 ? ", " : "");
      }
      std::cerr << std::dec << "]" << std::endl;
    } else {
      std::cerr << "[no siblings]" << std::endl;
    }
  }
  std::cerr << std::endl;

  // Creates an atom called "XPP_STRING_PROPERTY_DEMO" with a string property
  // "xpp is working" on the root window
  // check with `xprop -root XPP_STRING_PROPERTY_DEMO`
  try {
    auto my_string_atom =
      xpp::x::intern_atom(connection, false, "XPP_STRING_PROPERTY_DEMO");

    std::string my_string("xpp is working!");

    std::cerr << "atom for \"XPP_STRING_PROPERTY_DEMO\": "
              << my_string_atom.atom() << std::endl;

    auto atom_name = connection.get_atom_name(my_string_atom.atom());
    std::cerr << "atom name: " << atom_name.name() << std::endl;;

    connection.change_property_checked(
        XCB_PROP_MODE_REPLACE, connection.root(),
        my_string_atom.atom(), XCB_ATOM_STRING, 8,
        // using Iterator begin + end here
        my_string.begin(), my_string.end());

    // this will deliberately fail because window = 0
    // However, the previous call to change_property succeeded,
    // so everything is just fine
    connection.change_property_checked( XCB_PROP_MODE_REPLACE, 0,
        my_string_atom.atom(), XCB_ATOM_STRING, 8,
        // using length() & c_str()
        my_string.length(), my_string.c_str());

  } catch (const std::exception & e) {
    std::cerr << "change property failed: " << e.what() << std::endl;
  }
  std::cerr << std::endl;

  // Get the _NET_CLIENT_LIST_STACKING property
  // If an error occurs, it will be thrown only when trying to access the reply
  std::string _net_client_list_stacking = "_NET_CLIENT_LIST_STACKING";
  auto net_client_list_stacking_atom =
    connection.intern_atom(false, _net_client_list_stacking);
  auto net_client_list_stacking = connection.get_property(
      false, connection.root(), net_client_list_stacking_atom.atom(),
      XCB_ATOM_WINDOW, 0, UINT32_MAX);

  try {
    std::cerr << _net_client_list_stacking << " (xcb_window_t):" << std::hex;
    for (auto && w : net_client_list_stacking.value<xcb_window_t>()) {
      std::cerr << " 0x" << w;
    }
    std::cerr << std::dec << std::endl;

    std::cerr << _net_client_list_stacking << " (x::window):";
    for (auto && w : net_client_list_stacking.value<x::window>()) {
      std::cerr << " " << w;
    }
    std::cerr << std::endl;

    std::cerr << _net_client_list_stacking << " (x::xcb_window):";
    for (auto && w : net_client_list_stacking.value<x::xcb_window>()) {
      std::cerr << " " << w;
    }
    std::cerr << std::endl;

  } catch (const std::exception & e) {
    std::cerr << "Could not get " << _net_client_list_stacking << " property: "
              << e.what() << std::endl;
  }
  std::cerr << std::endl;

  // Randr needs query_version to work properly in subsequent calls
  // If methods are ambiguous (like query_version, then the extension interface
  // can be accessed through "extension_name()" (e.g. randr() or damage())
  connection.randr().query_version(XCB_RANDR_MAJOR_VERSION,
                                   XCB_RANDR_MINOR_VERSION);

  connection.select_input_checked(connection.root(), XCB_RANDR_NOTIFY);

  const auto & randr_ext = connection.extension<xpp::randr::extension>();

  std::cerr << "RandR Extension" << std::endl;
  std::cerr << "\tfirst_event: " << (int)randr_ext->first_event << std::endl;
  std::cerr << "\tfirst_error: " << (int)randr_ext->first_error << std::endl;

  const auto & damage_ext = connection.extension<xpp::damage::extension>();

  std::cerr << "Damage Extension" << std::endl;
  std::cerr << "\tfirst_event: " << (int)damage_ext->first_event << std::endl;
  std::cerr << "\tfirst_error: " << (int)damage_ext->first_error << std::endl;

  std::cerr << std::endl;

  try {
    // Produces XCB_RANDR_BAD_OUTPUT error
    auto output_info = connection.get_output_info(-1);
    output_info.get();
  } catch (const std::exception & e) {
    std::cerr << "get_output_info error: " << e.what() << std::endl;
  }

  try {
    // Produces XCB_RANDR_BAD_CRTC error
    auto crtc_info = connection.get_crtc_info(-1);
    crtc_info.get();
  } catch (const std::exception & e) {
    std::cerr << "get_crtc_info error: " << e.what() << std::endl;
  }

  // Produces XCB_RANDR_BAD_OUTPUT error in event queue
  auto output_info = connection.get_output_info_unchecked(-1);
  output_info.get();

  // Produces XCB_RANDR_BAD_CRTC error in event queue
  auto crtc_info = connection.get_crtc_info_unchecked(-1);
  crtc_info.get();

  try {
    // XCB_VALUE error
    connection.change_output_property_checked(-1, -1, -1, 0, 0, 0, nullptr);
  } catch (const std::exception & e) {
    std::cerr << "change_output_property error: " << e.what() << std::endl;
  }

  // XCB_VALUE error in event queue
  connection.change_output_property(-1, -1, -1, 0, 0, 0, nullptr);

  try {
    // XCB_RENDER_PICT_FORMAT error
    auto pict_index_values = connection.query_pict_index_values(-1);
    pict_index_values.get();
  } catch (const std::exception & e) {
    std::cerr << "query_pict_index_values error: " << e.what() << std::endl;
  }

  try {
    // XCB_RENDER_PICTURE error
    connection.change_picture_checked(-1, 0, nullptr);
  } catch (const std::exception & e) {
    std::cerr << "change_picture error: " << e.what() << std::endl;
  }

  // XCB_RENDER_PICT_FORMAT error in event queue
  auto pict_index_values = connection.query_pict_index_values_unchecked(-1);
  pict_index_values.get();

  // XCB_RENDER_PICTURE error in event queue
  connection.change_picture(-1, 0, nullptr);

  // Poll the event queue a couple of times to get the errors
  for (int i = 0; i < 5; ++i) {
    connection.flush();
    try {
      registry.dispatch(connection.wait_for_event());
    } catch (const std::exception & e) {
      std::cerr << "std::exception in event queue: " << e.what() << std::endl;
    }
  }

  return EXIT_SUCCESS;
}