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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_LINUX_GNOME_DISPLAY_CONFIG_DBUS_CLIENT_H_
#define REMOTING_HOST_LINUX_GNOME_DISPLAY_CONFIG_DBUS_CLIENT_H_
#include <gio/gio.h>
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "base/task/sequenced_task_runner.h"
#include "remoting/host/linux/gnome_display_config.h"
#include "remoting/host/linux/scoped_glib.h"
#include "ui/base/glib/scoped_gobject.h"
namespace remoting {
// This class provides a wrapper for the GNOME D-Bus API for querying the
// current display (monitor) configuration, and for applying a modified config.
// This wrapper never blocks the caller thread - the caller provides a
// OnceCallback to receive the current config. The caller can modify the
// returned GnomeDisplayConfig structure, and then ask GNOME to apply the
// changes. Note that applying a display config will take effect immediately,
// but will also cause GNOME to display a warning which allows the user to keep
// or revert the changes.
//
// Instances of this class only support a single callback at a time - later
// requests will cancel earlier ones. Changes to GNOME's display config
// should be infrequent, and if multiple operations are ongoing, only the
// latest operation should take effect.
class GnomeDisplayConfigDBusClient {
public:
using Callback = base::OnceCallback<void(GnomeDisplayConfig)>;
GnomeDisplayConfigDBusClient();
GnomeDisplayConfigDBusClient(const GnomeDisplayConfigDBusClient&) = delete;
GnomeDisplayConfigDBusClient& operator=(const GnomeDisplayConfigDBusClient&) =
delete;
~GnomeDisplayConfigDBusClient();
// Initializes the object by requesting a D-Bus connection. This should be
// called on the same thread as all other public methods, including the dtor.
// The private static methods get called by GLib and may execute on a
// different thread.
void Init();
// Request the latest config from GNOME. On success, the config will be
// provided to the callback.
void GetMonitorsConfig(Callback callback);
// Requests GNOME to apply a new config. If successful, the change will
// take immediate effect, but the user may see a popup window and they may
// choose to revert back to the previous settings.
void ApplyMonitorsConfig(GnomeDisplayConfig config);
// Fakes a GetCurrentState() response from GNOME. This allows unittests to
// exercise this code without relying on GNOME or DBus services.
void FakeDisplayConfigForTest(ScopedGVariant config);
private:
static void OnDBusGetReply(GObject* source_object,
GAsyncResult* result,
gpointer user_data);
static void OnDisplayConfigCurrentStateReply(GObject* source_object,
GAsyncResult* result,
gpointer user_data);
static void OnApplyMonitorsConfigReply(GObject* source_object,
GAsyncResult* result,
gpointer user_data);
// Starts an async call to the DBus GetCurrentState() method.
void CallDBusGetCurrentState();
// Called by OnDBusGetReply().
void OnDBusGet(ScopedGObject<GDBusConnection> dbus_connection);
// Called by OnDisplayConfigCurrentStateReply().
void OnDisplayConfigCurrentState(ScopedGVariant config);
// Called by OnDisplayConfigCurrentStateReply() on error.
void OnDisplayConfigCurrentStateError();
base::WeakPtr<GnomeDisplayConfigDBusClient> weak_ptr_;
scoped_refptr<base::SequencedTaskRunner> caller_task_runner_;
ScopedGObject<GCancellable> cancellable_
GUARDED_BY_CONTEXT(sequence_checker_);
ScopedGObject<GDBusConnection> dbus_connection_
GUARDED_BY_CONTEXT(sequence_checker_);
Callback pending_callback_ GUARDED_BY_CONTEXT(sequence_checker_);
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<GnomeDisplayConfigDBusClient> weak_factory_{this};
};
} // namespace remoting
#endif // REMOTING_HOST_LINUX_GNOME_DISPLAY_CONFIG_DBUS_CLIENT_H_
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