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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:ffi';
import 'package:ffi/ffi.dart';
import 'package:flutter/foundation.dart' show visibleForTesting;
// GApplication* g_application_get_default();
typedef _GApplicationGetDefaultC = IntPtr Function();
typedef _GApplicationGetDefaultDart = int Function();
// const gchar* g_application_get_application_id(GApplication* application);
typedef _GApplicationGetApplicationIdC = Pointer<Utf8> Function(IntPtr);
typedef _GApplicationGetApplicationIdDart = Pointer<Utf8> Function(int);
/// Interface for interacting with libgio.
@visibleForTesting
class GioUtils {
/// Creates a default instance that uses the real libgio.
GioUtils() {
try {
_gio = DynamicLibrary.open('libgio-2.0.so');
} on ArgumentError {
_gio = null;
}
}
DynamicLibrary? _gio;
/// True if libgio was opened successfully.
bool get libraryIsPresent => _gio != null;
/// Wraps `g_application_get_default`.
int gApplicationGetDefault() {
if (_gio == null) {
return 0;
}
final _GApplicationGetDefaultDart getDefault = _gio!
.lookupFunction<_GApplicationGetDefaultC, _GApplicationGetDefaultDart>(
'g_application_get_default');
return getDefault();
}
/// Wraps g_application_get_application_id.
Pointer<Utf8> gApplicationGetApplicationId(int app) {
if (_gio == null) {
return nullptr;
}
final _GApplicationGetApplicationIdDart gApplicationGetApplicationId = _gio!
.lookupFunction<_GApplicationGetApplicationIdC,
_GApplicationGetApplicationIdDart>(
'g_application_get_application_id');
return gApplicationGetApplicationId(app);
}
}
/// Allows overriding the default GioUtils instance with a fake for testing.
@visibleForTesting
GioUtils? gioUtilsOverride;
/// Gets the application ID for this app.
String? getApplicationId() {
final GioUtils gio = gioUtilsOverride ?? GioUtils();
if (!gio.libraryIsPresent) {
return null;
}
final int app = gio.gApplicationGetDefault();
if (app == 0) {
return null;
}
final Pointer<Utf8> appId = gio.gApplicationGetApplicationId(app);
if (appId == nullptr) {
return null;
}
return appId.toDartString();
}