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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.
#include "ui/gfx/x/property_cache.h"
#include <limits>
#include "base/check_op.h"
#include "ui/gfx/x/connection.h"
#include "ui/gfx/x/event.h"
#include "ui/gfx/x/xproto.h"
namespace x11 {
PropertyCache::PropertyCache(Connection* connection,
Window window,
const std::vector<Atom>& properties,
OnChangeCallback on_change)
: connection_(connection),
window_(window),
event_selector_(
connection->ScopedSelectEvent(window_, EventMask::PropertyChange)),
on_change_(std::move(on_change)) {
connection_->AddEventObserver(this);
std::vector<std::pair<Atom, PropertyValue>> mem(properties.size());
for (size_t i = 0; i < properties.size(); i++) {
mem[i].first = properties[i];
}
properties_ = base::flat_map<Atom, PropertyValue>(std::move(mem));
for (auto it = properties_.begin(); it != properties_.end(); ++it) {
FetchProperty(it);
}
}
PropertyCache::~PropertyCache() {
connection_->RemoveEventObserver(this);
}
const GetPropertyResponse& PropertyCache::Get(Atom atom) {
auto it = properties_.find(atom);
CHECK(it != properties_.end());
if (!it->second.response.has_value()) {
it->second.future.DispatchNow();
}
CHECK(it->second.response.has_value());
return it->second.response.value();
}
void PropertyCache::OnEvent(const Event& xev) {
auto* prop = xev.As<PropertyNotifyEvent>();
if (!prop) {
return;
}
if (prop->window != window_) {
return;
}
auto it = properties_.find(prop->atom);
if (it == properties_.end()) {
return;
}
if (prop->state == Property::NewValue) {
FetchProperty(it);
} else {
CHECK_EQ(prop->state, Property::Delete);
// When the property is deleted, a GetPropertyRequest will result in a
// zeroed GetPropertyReply, so set the reply state now to avoid making an
// unnecessary request.
OnGetPropertyResponse(
it, GetPropertyResponse{std::make_unique<GetPropertyReply>(), nullptr});
}
}
void PropertyCache::FetchProperty(PropertiesIterator it) {
it->second.future =
static_cast<XProto*>(connection_)
->GetProperty({
.window = window_,
.property = it->first,
.long_length = std::numeric_limits<uint32_t>::max(),
});
it->second.future.OnResponse(base::BindOnce(
&PropertyCache::OnGetPropertyResponse, weak_factory_.GetWeakPtr(), it));
}
void PropertyCache::OnGetPropertyResponse(PropertiesIterator it,
GetPropertyResponse response) {
it->second.response = std::move(response);
if (on_change_) {
on_change_.Run(it->first, it->second.response.value());
}
}
PropertyCache::PropertyValue::PropertyValue() = default;
PropertyCache::PropertyValue::PropertyValue(PropertyValue&&) = default;
PropertyCache::PropertyValue& PropertyCache::PropertyValue::operator=(
PropertyValue&&) = default;
PropertyCache::PropertyValue::~PropertyValue() = default;
} // namespace x11
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