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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_X_EVENT_H_
#define UI_GFX_X_EVENT_H_
#include <X11/Xlib.h>
#include <xcb/xcb.h>
#include <cstdint>
#include <utility>
#include "base/component_export.h"
namespace x11 {
class Connection;
class Event;
COMPONENT_EXPORT(X11)
void ReadEvent(Event* event, Connection* connection, const uint8_t* buffer);
class COMPONENT_EXPORT(X11) Event {
public:
// Used to create events for testing.
template <typename T>
Event(XEvent* xlib_event, T&& xproto_event) {
sequence_valid_ = true;
sequence_ = xlib_event_.xany.serial;
custom_allocated_xlib_event_ = true;
xlib_event_ = *xlib_event;
type_id_ = T::type_id;
deleter_ = [](void* event) { delete reinterpret_cast<T*>(event); };
event_ = new T(std::forward<T>(xproto_event));
}
Event();
Event(xcb_generic_event_t* xcb_event,
Connection* connection,
bool sequence_valid = true);
Event(const Event&) = delete;
Event& operator=(const Event&) = delete;
Event(Event&& event);
Event& operator=(Event&& event);
~Event();
template <typename T>
T* As() {
if (type_id_ == T::type_id)
return reinterpret_cast<T*>(event_);
return nullptr;
}
template <typename T>
const T* As() const {
return const_cast<Event*>(this)->As<T>();
}
bool sequence_valid() const { return sequence_valid_; }
uint32_t sequence() const { return sequence_; }
const XEvent& xlib_event() const { return xlib_event_; }
XEvent& xlib_event() { return xlib_event_; }
private:
friend void ReadEvent(Event* event,
Connection* connection,
const uint8_t* buffer);
void Dealloc();
bool sequence_valid_ = false;
uint32_t sequence_ = 0;
// Indicates if |xlib_event_| was allocated manually and therefore
// needs to be freed manually.
bool custom_allocated_xlib_event_ = false;
XEvent xlib_event_{};
// XProto event state.
int type_id_ = 0;
void (*deleter_)(void*) = nullptr;
void* event_ = nullptr;
};
} // namespace x11
#endif // UI_GFX_X_EVENT_H_
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