wayland-client.hpp

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/*
 * Copyright (c) 2014-2022, Nils Christopher Brause, Philipp Kerling
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef WAYLAND_CLIENT_HPP
#define WAYLAND_CLIENT_HPP

 
#include <atomic>
#include <cstdint>
#include <functional>
#include <memory>
#include <string>
#include <vector>
#include <cstdint>
#include <wayland-version.hpp>
#include <wayland-client-core.h>
#include <wayland-util.hpp>
 
namespace wayland
{
  using log_handler = std::function<void(std::string)> ;

  void set_log_handler(log_handler handler);

  class event_queue_t : public detail::refcounted_wrapper<wl_event_queue>
  {
    event_queue_t(wl_event_queue *q);
    friend class display_t;
  public:
    event_queue_t() = default;
    event_queue_t(const event_queue_t&) = default;
    event_queue_t(event_queue_t&&) noexcept = default;
    event_queue_t& operator=(const event_queue_t&) = default;
    event_queue_t& operator=(event_queue_t&&) noexcept = default;
    ~event_queue_t() noexcept = default;
  };
 
  class display_t;
 
  namespace detail
  {
    struct proxy_data_t;
    // base class for event listener storage.
    struct events_base_t
    {
      events_base_t() = default;
      events_base_t(const events_base_t&) = default;
      events_base_t(events_base_t&&) noexcept = default;
      events_base_t& operator=(const events_base_t&) = default;
      events_base_t& operator=(events_base_t&&) noexcept = default;
      virtual ~events_base_t() noexcept = default;
    };
  }

  class proxy_t
  {
  public:
    enum class wrapper_type
    {
      standard,
      display,
      foreign,
      proxy_wrapper
    };
 
  private:
    wl_proxy *proxy = nullptr;
    detail::proxy_data_t *data = nullptr;
    wrapper_type type = wrapper_type::standard;
    friend class detail::argument_t;
    friend struct detail::proxy_data_t;
 
    // Interface desctiption filled in by the each interface class
    const wl_interface *interface = nullptr;
 
    // copy constructor filled in by the each interface class
    std::function<proxy_t(proxy_t)> copy_constructor;
 
    // universal dispatcher
    static int c_dispatcher(const void *implementation, void *target,
                            uint32_t opcode, const wl_message *message,
                            wl_argument *args);
 
    // marshal request
    proxy_t marshal_single(uint32_t opcode, const wl_interface *interface,
                           const std::vector<detail::argument_t>& args, std::uint32_t version = 0);
 
  protected:
    void set_interface(const wl_interface *iface);
    void set_copy_constructor(const std::function<proxy_t(proxy_t)>& func);
 
    friend class registry_t;
    // marshal a request, that doesn't lead a new proxy
    // Valid types for args are:
    // - uint32_t
    // - int32_t
    // - proxy_t
    // - std::string
    // - array_t
    template <typename...T>
    void marshal(uint32_t opcode, const T& ...args)
    {
      std::vector<detail::argument_t> v = { detail::argument_t(args)... };
      marshal_single(opcode, nullptr, v);
    }
 
    // marshal a request that leads to a new proxy with inherited version
    template <typename...T>
    proxy_t marshal_constructor(uint32_t opcode, const wl_interface *interface,
                                const T& ...args)
    {
      std::vector<detail::argument_t> v = { detail::argument_t(args)... };
      return marshal_single(opcode, interface, v);
    }
 
    // marshal a request that leads to a new proxy with specific version
    template <typename...T>
    proxy_t marshal_constructor_versioned(uint32_t opcode, const wl_interface *interface,
                                          uint32_t version, const T& ...args)
    {
      std::vector<detail::argument_t> v = { detail::argument_t(args)... };
      return marshal_single(opcode, interface, v, version);
    }
 
    // Set the opcode for destruction of the proxy
    void set_destroy_opcode(uint32_t destroy_opcode);
 
    /*
      Sets the dispatcher and its user data. User data must be an
      instance of a class derived from events_base_t, allocated with
      new. Will automatically be deleted upon destruction.
    */
    void set_events(std::shared_ptr<detail::events_base_t> events,
                    int(*dispatcher)(uint32_t, const std::vector<detail::any>&, const std::shared_ptr<detail::events_base_t>&));
 
    // Retrieve the previously set user data
    std::shared_ptr<detail::events_base_t> get_events();
 
    // Constructs NULL proxies.
    proxy_t() = default;
 
    struct construct_proxy_wrapper_tag {};
    // Construct from proxy as wrapper
    proxy_t(const proxy_t &wrapped_proxy, construct_proxy_wrapper_tag /*unused*/);
 
  public:
    proxy_t(wl_proxy *p, wrapper_type t = wrapper_type::standard, event_queue_t const& queue = event_queue_t());

    proxy_t(const proxy_t &p);

    proxy_t &operator=(const proxy_t &p);

    proxy_t(proxy_t &&p) noexcept;

    proxy_t &operator=(proxy_t &&p) noexcept;

    ~proxy_t();

    uint32_t get_id() const;

    std::string get_class() const;

    uint32_t get_version() const;

    wrapper_type get_wrapper_type() const
    {
      return type;
    }

    void set_queue(event_queue_t queue);

    wl_proxy *c_ptr() const;

    bool proxy_has_object() const;

    operator bool() const;

    bool operator==(const proxy_t &right) const;

    bool operator!=(const proxy_t &right) const;

    void proxy_release();
  };

  class read_intent
  {
  public:
    read_intent(read_intent &&other) noexcept = default;
    read_intent(read_intent const &other) = delete;
    read_intent& operator=(read_intent const &other) = delete;
    read_intent& operator=(read_intent &&other) noexcept = delete;
    ~read_intent();

    bool is_finalized() const;

    void cancel();

    void read();
 
  private:
    read_intent(wl_display *display, wl_event_queue *event_queue = nullptr);
    friend class display_t;
 
    wl_display *display;
    wl_event_queue *event_queue = nullptr;
    bool finalized = false;
  };
 
  class callback_t;
  class registry_t;

  class display_t : public proxy_t
  {
  private:
    // Construct as proxy wrapper
    display_t(proxy_t const &wrapped_proxy, construct_proxy_wrapper_tag /*unused*/);
 
  public:
    display_t(int fd);
 
    display_t(display_t &&d) noexcept;
    display_t(const display_t &d) = delete;
    display_t &operator=(const display_t &d) = delete;
    display_t &operator=(display_t &&d) noexcept;

    display_t(const std::string& name = {});

    explicit display_t(wl_display* display);

    ~display_t() noexcept = default;

    event_queue_t create_queue() const;

    int get_fd() const;

    int roundtrip() const;

    int roundtrip_queue(const event_queue_t& queue) const;

    read_intent obtain_read_intent() const;

    read_intent obtain_queue_read_intent(const event_queue_t& queue) const;

    int dispatch_queue(const event_queue_t& queue) const;

    int dispatch_queue_pending(const event_queue_t& queue) const;

    int dispatch() const;

    int dispatch_pending() const;

    int get_error() const;

    std::tuple<int, bool> flush() const;

    callback_t sync();

    registry_t get_registry();
 
    operator wl_display*() const;

    display_t proxy_create_wrapper();
  };
}
 
#include <wayland-client-protocol.hpp>
 
#endif