feat: Add Native Splash Screen for Improved Startup UX

frontend/appflowy_flutter/integration_test/shared/data.dart

@@ -58,7 +58,7 @@ class TestWorkspaceService {
   Future<void> setUp() async {
     final inputStream =
         InputFileStream(await workspace.zip.then((value) => value.path));
-    final archive = ZipDecoder().decodeBuffer(inputStream);
+    final archive = ZipDecoder().decodeBytes(inputStream.file.buffer);
     await extractArchiveToDisk(
       archive,
       await TestWorkspace._parent.then((value) => value.path),

frontend/appflowy_flutter/lib/shared/markdown_to_document.dart

@@ -34,7 +34,7 @@ Future<String> customDocumentToMarkdown(
   /// create root Archive and directory
   final id = document.root.id,
       archive = Archive(),
-      resourceDir = ArchiveFile('$id/', 0, null)..isFile = false,
+      resourceDir = ArchiveFile('$id/', 0, [])..isFile = false,
       fileName = p.basenameWithoutExtension(path),
       dirName = resourceDir.name;
 
@@ -78,7 +78,7 @@ Future<String> customDocumentToMarkdown(
     if (onArchive == null) {
       final zipEncoder = ZipEncoder();
       final zip = zipEncoder.encode(archive);
-      if (zip != null) {
+      if (zip.isNotEmpty) {
         final zipFile = await File(path).writeAsBytes(zip);
         if (Platform.isIOS) {
           await Share.shareUri(zipFile.uri);

frontend/appflowy_flutter/lib/startup/startup.dart

@@ -129,13 +129,13 @@ class FlowyRunner {
 
         // localization
         const InitLocalizationTask(),
-        // init the app window
-        InitAppWindowTask(),
         // Init Rust SDK
         InitRustSDKTask(customApplicationPath: applicationDataDirectory),
         // Load Plugins, like document, grid ...
         const PluginLoadTask(),
         const FileStorageTask(),
+        // init the app window
+        InitAppWindowTask(),
 
         // init the app widget
         // ignore in test mode

frontend/appflowy_flutter/lib/startup/tasks/windows.dart

@@ -8,6 +8,7 @@ import 'package:flutter/material.dart';
 import 'package:scaled_app/scaled_app.dart';
 import 'package:window_manager/window_manager.dart';
 import 'package:universal_platform/universal_platform.dart';
+import 'package:native_splash_screen/native_splash_screen.dart' as nss;
 
 class InitAppWindowTask extends LaunchTask with WindowListener {
   InitAppWindowTask({this.title = 'AppFlowy'});
@@ -61,6 +62,8 @@ class InitAppWindowTask extends LaunchTask with WindowListener {
           appWindow.position = position;
         }
 
+        await nss.close(animation: nss.CloseAnimation.fade);
+
         /// on Windows we maximize the window if it was previously closed
         /// from a maximized state.
         final isMaximized = await windowSizeManager.getWindowMaximized();
@@ -72,6 +75,9 @@ class InitAppWindowTask extends LaunchTask with WindowListener {
       await windowManager.waitUntilReadyToShow(windowOptions, () async {
         await windowManager.show();
         await windowManager.focus();
+        if (UniversalPlatform.isLinux || UniversalPlatform.isMacOS) {
+          await nss.close(animation: nss.CloseAnimation.fade);
+        }
 
         if (position != null) {
           await windowManager.setPosition(position);

frontend/appflowy_flutter/lib/util/share_log_files.dart

@@ -38,7 +38,7 @@ Future<void> shareLogFiles(BuildContext? context) async {
   }
 
   final zip = zipEncoder.encode(archive);
-  if (zip == null) {
+  if (zip.isNotEmpty) {
     if (context != null && context.mounted) {
       showToastNotification(
         message: LocaleKeys.noLogFiles.tr(),

frontend/appflowy_flutter/linux/CMakeLists.txt

@@ -45,6 +45,9 @@ pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
 
 add_definitions(-DAPPLICATION_ID="${APPLICATION_ID}")
 
+# Include splash screen library configuration
+include("${CMAKE_CURRENT_SOURCE_DIR}/runner/native_splash_screen.cmake")
+
 # Application build
 add_executable(${BINARY_NAME}
   "main.cc"

frontend/appflowy_flutter/linux/main.cc

@@ -1,6 +1,15 @@
+#include <native_splash_screen_linux/native_splash_screen_linux_plugin.h>
 #include "my_application.h"
 
+
 int main(int argc, char** argv) {
-  g_autoptr(MyApplication) app = my_application_new();
-  return g_application_run(G_APPLICATION(app), argc, argv);
+    // Initialize GTK first
+    gtk_init(&argc, &argv);
+
+    // So can safely show the splash screen first.
+    show_splash_screen();
+
+    // Then initialize and run the application as normal
+    g_autoptr(MyApplication) app = my_application_new();
+    return g_application_run(G_APPLICATION(app), argc, argv);
 }

frontend/appflowy_flutter/linux/my_application.cc

@@ -31,7 +31,7 @@ static void my_application_activate(GApplication *application)
   gtk_window_set_title(window, "AppFlowy");
 
   gtk_window_set_default_size(window, 1280, 720);
-  gtk_widget_show(GTK_WIDGET(window));
+  gtk_widget_realize(GTK_WIDGET(window));
 
   g_autoptr(FlDartProject) project = fl_dart_project_new();
   fl_dart_project_set_dart_entrypoint_arguments(project, self->dart_entrypoint_arguments);

frontend/appflowy_flutter/linux/runner/native_splash_screen.cmake

@@ -0,0 +1,48 @@
+# Generated file - do not edit
+# Generated by native_splash_screen_cli
+
+# Determine splash screen files for different build types
+set(SPLASH_SCREEN_FILE_DEBUG "${CMAKE_CURRENT_SOURCE_DIR}/runner/native_splash_screen_debug.cc")
+set(SPLASH_SCREEN_FILE_RELEASE "${CMAKE_CURRENT_SOURCE_DIR}/runner/native_splash_screen_release.cc")
+set(SPLASH_SCREEN_FILE_PROFILE "${CMAKE_CURRENT_SOURCE_DIR}/runner/native_splash_screen_profile.cc")
+
+# Validate that all expected files exist
+foreach(CONFIG_TYPE IN ITEMS DEBUG RELEASE PROFILE)
+    string(TOLOWER "${CONFIG_TYPE}" CONFIG_TYPE_LOWER)
+    if(NOT EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/runner/native_splash_screen_${CONFIG_TYPE_LOWER}.cc")
+        message(FATAL_ERROR
+            "\n-------------------------------------------------------------\n"
+            "Missing splash screen configuration for ${CONFIG_TYPE} mode:\n"
+            "${CMAKE_CURRENT_SOURCE_DIR}/runner/native_splash_screen_${CONFIG_TYPE_LOWER}.cc\n\n"
+            "Please run the following command in your project root:\n"
+            "   dart run native_splash_screen_cli gen\n"
+            "This will generate all necessary configuration files.\n"
+            "-------------------------------------------------------------\n")
+    endif()
+endforeach()
+
+# Create a static library for the splash screen code
+add_library(native_splash_screen_linux STATIC "")
+
+# Dynamically select the correct splash screen source file per config
+target_sources(native_splash_screen_linux
+  PRIVATE
+    "$<IF:$<CONFIG:Debug>,${SPLASH_SCREEN_FILE_DEBUG},$<IF:$<CONFIG:Profile>,${SPLASH_SCREEN_FILE_PROFILE},${SPLASH_SCREEN_FILE_RELEASE}>>"
+)
+
+# Set properties for the library
+set_target_properties(native_splash_screen_linux PROPERTIES
+  CXX_STANDARD 17
+  CXX_STANDARD_REQUIRED YES
+  POSITION_INDEPENDENT_CODE ON
+)
+
+# Include directories
+target_include_directories(native_splash_screen_linux PUBLIC
+  "${CMAKE_CURRENT_SOURCE_DIR}"
+)
+
+# Warn if CMAKE_BUILD_TYPE is unset in single-config environments
+if(NOT CMAKE_CONFIGURATION_TYPES AND NOT CMAKE_BUILD_TYPE)
+  message(WARNING "CMAKE_BUILD_TYPE not set. Defaulting to Release splash screen.")
+endif()