polybar-dwm/include/components/x11/xembed.hpp

#pragma once

#include <xcb/xcb.h>

#include "common.hpp"
#include "components/x11/connection.hpp"

LEMONBUDDY_NS

#define XEMBED_VERSION 0
#define XEMBED_MAPPED (1 << 0)

#define XEMBED_EMBEDDED_NOTIFY 0
#define XEMBED_WINDOW_ACTIVATE 1
#define XEMBED_WINDOW_DEACTIVATE 2
#define XEMBED_REQUEST_FOCUS 3
#define XEMBED_FOCUS_IN 3
#define XEMBED_FOCUS_OUT 4
#define XEMBED_FOCUS_NEXT 5
#define XEMBED_FOCUS_PREV 6

#define XEMBED_FOCUS_CURRENT 0
#define XEMBED_FOCUS_FIRST 1
#define XEMBED_FOCUS_LAST 1

struct xembed_data {
  unsigned long version;
  unsigned long flags;
  xcb_timestamp_t time;
  xcb_atom_t xembed;
  xcb_atom_t xembed_info;
};

namespace xembed {
  /**
   * Query _XEMBED_INFO for the given window
   */
  xembed_data* query(connection& conn, xcb_window_t win, xembed_data* data) {
    auto info = conn.get_property(false, win, _XEMBED_INFO, XCB_GET_PROPERTY_TYPE_ANY, 0L, 2);

    if (info->value_len == 0)
      throw application_error("Invalid _XEMBED_INFO for window " + conn.id(win));

    std::vector<uint32_t> xembed_data{info.value<uint32_t>().begin(), info.value<uint32_t>().end()};

    data->xembed = _XEMBED;
    data->xembed_info = _XEMBED_INFO;

    data->time = XCB_CURRENT_TIME;
    data->flags = xembed_data[1];
    data->version = xembed_data[0];

    return data;
  }

  /**
   * Send _XEMBED messages
   */
  inline auto send_message(
      connection& conn, xcb_window_t target, long message, long d1, long d2, long d3) {
    auto msg = conn.make_client_message(_XEMBED, target);
    msg->data.data32[0] = XCB_CURRENT_TIME;
    msg->data.data32[1] = message;
    msg->data.data32[2] = d1;
    msg->data.data32[3] = d2;
    msg->data.data32[4] = d3;
    conn.send_client_message(msg, target);
  }

  /**
   * Send window focus event
   */
  inline auto send_focus_event(connection& conn, xcb_window_t target) {
    auto msg = conn.make_client_message(WM_PROTOCOLS, target);
    msg->data.data32[0] = WM_TAKE_FOCUS;
    msg->data.data32[1] = XCB_CURRENT_TIME;
    conn.send_client_message(msg, target);
  }

  /**
   * Acknowledge window embedding
   */
  inline auto notify_embedded(
      connection& conn, xcb_window_t win, xcb_window_t embedder, long version) {
    send_message(conn, win, XEMBED_EMBEDDED_NOTIFY, 0, embedder, version);
  }

  /**
   * Send window activate notification
   */
  inline auto notify_activated(connection& conn, xcb_window_t win) {
    send_message(conn, win, XEMBED_WINDOW_ACTIVATE, 0, 0, 0);
  }

  /**
   * Send window deactivate notification
   */
  inline auto notify_deactivated(connection& conn, xcb_window_t win) {
    send_message(conn, win, XEMBED_WINDOW_DEACTIVATE, 0, 0, 0);
  }

  /**
   * Send window focused notification
   */
  inline auto notify_focused(connection& conn, xcb_window_t win, long focus_type) {
    send_message(conn, win, XEMBED_FOCUS_IN, focus_type, 0, 0);
  }

  /**
   * Send window unfocused notification
   */
  inline auto notify_unfocused(connection& conn, xcb_window_t win) {
    send_message(conn, win, XEMBED_FOCUS_OUT, 0, 0, 0);
  }

  /**
   * Unembed given window
   */
  inline auto unembed(connection& conn, xcb_window_t win, xcb_window_t root) {
    try {
      conn.unmap_window_checked(win);
      conn.reparent_window_checked(win, root, 0, 0);
    } catch (const xpp::x::error::window& err) {
      // invalid window
    }
  }
}

LEMONBUDDY_NS_END