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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 <cstdint>
#include <utility>
#include "base/component_export.h"
#include "base/memory/ref_counted_memory.h"
#include "base/memory/scoped_refptr.h"
#include "ui/gfx/x/xproto.h"
namespace x11 {
class Connection;
class Event;
struct ReadBuffer;
COMPONENT_EXPORT(X11)
void ReadEvent(Event* event, Connection* connection, ReadBuffer* buffer);
class COMPONENT_EXPORT(X11) Event {
public:
template <typename T>
explicit Event(T&& xproto_event, bool sequence_valid = true) {
using DecayT = std::decay_t<T>;
sequence_valid_ = true;
sequence_ = xproto_event.sequence;
type_id_ = DecayT::type_id;
deleter_ = [](void* event) { delete reinterpret_cast<DecayT*>(event); };
auto* event = new DecayT(std::forward<T>(xproto_event));
event_ = event;
window_ = event->GetWindow();
sequence_valid_ = sequence_valid;
}
Event();
// |event_bytes| is modified and will not be valid after this call.
// A copy is necessary if the original data is still needed.
Event(scoped_refptr<base::RefCountedMemory> event_bytes,
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_; }
x11::Window window() const { return window_ ? *window_ : x11::Window::None; }
void set_window(x11::Window window) {
if (window_)
*window_ = window;
}
bool Initialized() const { return deleter_; }
private:
friend void ReadEvent(Event* event,
Connection* connection,
ReadBuffer* buffer);
void Dealloc();
bool sequence_valid_ = false;
uint16_t sequence_ = 0;
// XProto event state.
int type_id_ = 0;
void (*deleter_)(void*) = nullptr;
void* event_ = nullptr;
// This member points to a field in |event_|, or may be nullptr if there's no
// associated window for the event. It's owned by |event_|, not us.
x11::Window* window_ = nullptr;
};
} // namespace x11
#endif // UI_GFX_X_EVENT_H_
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