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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_X_PROPERTY_CACHE_H_
#define UI_GFX_X_PROPERTY_CACHE_H_
#include <optional>
#include <vector>
#include "base/component_export.h"
#include "base/containers/flat_map.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted_memory.h"
#include "base/memory/weak_ptr.h"
#include "ui/gfx/x/event_observer.h"
#include "ui/gfx/x/future.h"
#include "ui/gfx/x/window_event_manager.h"
#include "ui/gfx/x/xproto.h"
namespace x11 {
// Watches properties on an X11 window. Property values are obtained once upon
// creation and are refreshed after each property change.
class COMPONENT_EXPORT(X11) PropertyCache : public EventObserver {
public:
using OnChangeCallback =
base::RepeatingCallback<void(Atom, const GetPropertyResponse&)>;
PropertyCache(Connection* connection,
Window window,
const std::vector<Atom>& properties,
OnChangeCallback on_change = {});
PropertyCache(const PropertyCache&) = delete;
PropertyCache& operator=(const PropertyCache&) = delete;
~PropertyCache() override;
const GetPropertyResponse& Get(Atom atom);
template <typename T>
static const T* GetAs(const GetPropertyResponse& response,
size_t* size = nullptr) {
if (size) {
*size = 0;
}
if (!response || response->format != CHAR_BIT * sizeof(T) ||
!response->value_len) {
return nullptr;
}
if (size) {
*size = response->value_len;
}
return response->value->cast_to<T>();
}
template <typename T>
const T* GetAs(Atom atom, size_t* size = nullptr) {
return GetAs<T>(Get(atom), size);
}
template <typename T>
static base::span<const T> GetAsSpan(const GetPropertyResponse& response) {
size_t len;
const T* const data = GetAs<const T>(response, &len);
if (data && len > 0) {
UNSAFE_TODO(return base::span<const T>(data, len));
} else {
return base::span<const T>();
}
}
template <typename T>
base::span<const T> GetAsSpan(Atom atom) {
return GetAsSpan<T>(Get(atom));
}
private:
friend class PropertyCacheTest;
struct PropertyValue {
PropertyValue();
PropertyValue(PropertyValue&&);
PropertyValue& operator=(PropertyValue&&);
~PropertyValue();
Future<GetPropertyReply> future;
// |response| is nullopt if the request hasn't yet finished.
std::optional<GetPropertyResponse> response = std::nullopt;
};
using PropertiesIterator = base::flat_map<Atom, PropertyValue>::iterator;
// EventObserver:
void OnEvent(const Event& xev) override;
void FetchProperty(PropertiesIterator it);
void OnGetPropertyResponse(PropertiesIterator it,
GetPropertyResponse response);
raw_ptr<Connection> connection_;
Window window_;
ScopedEventSelector event_selector_;
base::flat_map<Atom, PropertyValue> properties_;
OnChangeCallback on_change_;
base::WeakPtrFactory<PropertyCache> weak_factory_{this};
};
} // namespace x11
#endif // UI_GFX_X_PROPERTY_CACHE_H_
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