// Copyright 2014 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. #include "my_application.h" #include <flutter_linux/flutter_linux.h> #include <math.h> #include <upower.h> #ifdef GDK_WINDOWING_X11 #include <gdk/gdkx.h> #endif #include "flutter/generated_plugin_registrant.h" struct _MyApplication { GtkApplication parent_instance; char** dart_entrypoint_arguments; FlView* view; // Connection to UPower. UpClient* up_client; GPtrArray* battery_devices; // Channel for Dart code to request the battery information. FlMethodChannel* battery_channel; // Channel to send updates to Dart code about battery charging state. FlEventChannel* charging_channel; gchar* last_charge_event; bool emit_charge_events; }; G_DEFINE_TYPE(MyApplication, my_application, GTK_TYPE_APPLICATION) // Checks the charging state and emits an event if necessary. static void update_charging_state(MyApplication* self) { if (!self->emit_charge_events) { return; } const gchar* charge_event = "discharging"; for (guint i = 0; i < self->battery_devices->len; i++) { UpDevice* device = static_cast<UpDevice*>(g_ptr_array_index(self->battery_devices, i)); guint state; g_object_get(device, "state", &state, nullptr); if (state == UP_DEVICE_STATE_CHARGING || state == UP_DEVICE_STATE_FULLY_CHARGED) { charge_event = "charging"; } } if (g_strcmp0(charge_event, self->last_charge_event) != 0) { g_autoptr(GError) error = nullptr; g_autoptr(FlValue) value = fl_value_new_string(charge_event); if (!fl_event_channel_send(self->charging_channel, value, nullptr, &error)) { g_warning("Failed to send charging event: %s", error->message); return; } g_free(self->last_charge_event); self->last_charge_event = g_strdup(charge_event); } } // Called when a UPower device changes state. static void up_device_state_changed_cb(MyApplication* self, GParamSpec* pspec, UpDevice* device) { update_charging_state(self); } // Called when UPower devices are added. static void up_device_added_cb(MyApplication* self, UpDevice* device) { // Listen for state changes from battery_devices. guint kind; g_object_get(device, "kind", &kind, nullptr); if (kind == UP_DEVICE_KIND_BATTERY) { g_ptr_array_add(self->battery_devices, g_object_ref(device)); g_signal_connect_swapped(device, "notify::state", G_CALLBACK(up_device_state_changed_cb), self); up_device_state_changed_cb(self, nullptr, device); } } // Called when UPower devices are removed. static void up_device_removed_cb(MyApplication* self, UpDevice* device) { g_ptr_array_remove(self->battery_devices, device); g_signal_handlers_disconnect_matched( device, G_SIGNAL_MATCH_FUNC, 0, 0, nullptr, reinterpret_cast<GClosure*>(up_device_state_changed_cb), nullptr); } // Gets the current battery level. static FlMethodResponse* get_battery_level(MyApplication* self) { // Find the first available battery and use that. for (guint i = 0; i < self->battery_devices->len; i++) { UpDevice* device = static_cast<UpDevice*>(g_ptr_array_index(self->battery_devices, i)); double percentage; g_object_get(device, "percentage", &percentage, nullptr); g_autoptr(FlValue) result = fl_value_new_int(static_cast<int64_t>(round(percentage))); return FL_METHOD_RESPONSE(fl_method_success_response_new(result)); } return FL_METHOD_RESPONSE(fl_method_error_response_new( "NO_BATTERY", "Device does not have a battery.", nullptr)); } // Called when the Dart code requests battery information. static void battery_method_call_cb(FlMethodChannel* channel, FlMethodCall* method_call, gpointer user_data) { MyApplication* self = static_cast<MyApplication*>(user_data); g_autoptr(FlMethodResponse) response = nullptr; if (strcmp(fl_method_call_get_name(method_call), "getBatteryLevel") == 0) { response = get_battery_level(self); } else { response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new()); } g_autoptr(GError) error = nullptr; if (!fl_method_call_respond(method_call, response, &error)) { g_warning("Failed to send response: %s", error->message); } } // Called when the Dart code starts listening for charging events. static FlMethodErrorResponse* charging_listen_cb(FlEventChannel* channel, FlValue* args, gpointer user_data) { MyApplication* self = static_cast<MyApplication*>(user_data); self->emit_charge_events = true; update_charging_state(self); return nullptr; } // Called when the Dart code stops listening for charging events. static FlMethodErrorResponse* charging_cancel_cb(FlEventChannel* channel, FlValue* args, gpointer user_data) { MyApplication* self = static_cast<MyApplication*>(user_data); self->emit_charge_events = false; return nullptr; } // Creates the platform channels this application provides. static void create_channels(MyApplication* self) { FlEngine* engine = fl_view_get_engine(self->view); FlBinaryMessenger* messenger = fl_engine_get_binary_messenger(engine); g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new(); self->battery_channel = fl_method_channel_new( messenger, "samples.flutter.io/battery", FL_METHOD_CODEC(codec)); fl_method_channel_set_method_call_handler( self->battery_channel, battery_method_call_cb, self, nullptr); self->charging_channel = fl_event_channel_new( messenger, "samples.flutter.io/charging", FL_METHOD_CODEC(codec)); fl_event_channel_set_stream_handlers(self->charging_channel, charging_listen_cb, charging_cancel_cb, self, nullptr); } // Implements GApplication::activate. static void my_application_activate(GApplication* application) { MyApplication* self = MY_APPLICATION(application); GtkWindow* window = GTK_WINDOW(gtk_application_window_new(GTK_APPLICATION(application))); // Use a header bar when running in GNOME as this is the common style used // by applications and is the setup most users will be using (e.g. Ubuntu // desktop). // If running on X and not using GNOME then just use a traditional title bar // in case the window manager does more exotic layout, e.g. tiling. // If running on Wayland assume the header bar will work (may need changing // if future cases occur). gboolean use_header_bar = TRUE; #ifdef GDK_WINDOWING_X11 GdkScreen* screen = gtk_window_get_screen(window); if (GDK_IS_X11_SCREEN(screen)) { const gchar* wm_name = gdk_x11_screen_get_window_manager_name(screen); if (g_strcmp0(wm_name, "GNOME Shell") != 0) { use_header_bar = FALSE; } } #endif if (use_header_bar) { GtkHeaderBar* header_bar = GTK_HEADER_BAR(gtk_header_bar_new()); gtk_widget_show(GTK_WIDGET(header_bar)); gtk_header_bar_set_title(header_bar, "platform_channel"); gtk_header_bar_set_show_close_button(header_bar, TRUE); gtk_window_set_titlebar(window, GTK_WIDGET(header_bar)); } else { gtk_window_set_title(window, "platform_channel"); } gtk_window_set_default_size(window, 1280, 720); gtk_widget_show(GTK_WIDGET(window)); g_autoptr(FlDartProject) project = fl_dart_project_new(); fl_dart_project_set_dart_entrypoint_arguments( project, self->dart_entrypoint_arguments); // Connect to UPower. self->up_client = up_client_new(); g_signal_connect_swapped(self->up_client, "device-added", G_CALLBACK(up_device_added_cb), self); g_signal_connect_swapped(self->up_client, "device-removed", G_CALLBACK(up_device_removed_cb), self); #if UP_CHECK_VERSION(0, 99, 8) // up_client_get_devices was deprecated and replaced with // up_client_get_devices2 in libupower 0.99.8. g_autoptr(GPtrArray) devices = up_client_get_devices2(self->up_client); #else g_autoptr(GPtrArray) devices = up_client_get_devices(self->up_client); #endif for (guint i = 0; i < devices->len; i++) { g_autoptr(UpDevice) device = static_cast<UpDevice*>(g_ptr_array_index(devices, i)); up_device_added_cb(self, device); } self->view = fl_view_new(project); gtk_widget_show(GTK_WIDGET(self->view)); gtk_container_add(GTK_CONTAINER(window), GTK_WIDGET(self->view)); fl_register_plugins(FL_PLUGIN_REGISTRY(self->view)); // Create application specific platform channels. create_channels(self); gtk_widget_grab_focus(GTK_WIDGET(self->view)); } // Implements GApplication::local_command_line. static gboolean my_application_local_command_line(GApplication* application, gchar*** arguments, int* exit_status) { MyApplication* self = MY_APPLICATION(application); // Strip out the first argument as it is the binary name. self->dart_entrypoint_arguments = g_strdupv(*arguments + 1); g_autoptr(GError) error = nullptr; if (!g_application_register(application, nullptr, &error)) { g_warning("Failed to register: %s", error->message); *exit_status = 1; return TRUE; } g_application_activate(application); *exit_status = 0; return TRUE; } // Implements GObject::dispose. static void my_application_dispose(GObject* object) { MyApplication* self = MY_APPLICATION(object); for (guint i = 0; i < self->battery_devices->len; i++) { UpDevice* device = static_cast<UpDevice*>(g_ptr_array_index(self->battery_devices, i)); g_signal_handlers_disconnect_matched(device, G_SIGNAL_MATCH_DATA, 0, 0, nullptr, nullptr, self); } g_signal_handlers_disconnect_matched(self->up_client, G_SIGNAL_MATCH_DATA, 0, 0, nullptr, nullptr, self); g_clear_pointer(&self->dart_entrypoint_arguments, g_strfreev); g_clear_object(&self->up_client); g_clear_object(&self->battery_devices); g_clear_object(&self->battery_channel); g_clear_object(&self->charging_channel); g_clear_pointer(&self->last_charge_event, g_free); G_OBJECT_CLASS(my_application_parent_class)->dispose(object); } static void my_application_class_init(MyApplicationClass* klass) { G_APPLICATION_CLASS(klass)->activate = my_application_activate; G_APPLICATION_CLASS(klass)->local_command_line = my_application_local_command_line; G_OBJECT_CLASS(klass)->dispose = my_application_dispose; } static void my_application_init(MyApplication* self) { self->battery_devices = g_ptr_array_new_with_free_func(g_object_unref); } MyApplication* my_application_new() { return MY_APPLICATION(g_object_new(my_application_get_type(), "application-id", APPLICATION_ID, "flags", G_APPLICATION_NON_UNIQUE, nullptr)); }