fix build issue

Author: lijy91

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
           cmake --version
           if [ "${{ matrix.platform }}" = "linux" ]; then
             sudo apt-get update
-            sudo apt-get install -y ninja-build libgtk-3-dev libx11-dev libxi-dev
+            sudo apt-get install -y ninja-build libgtk-3-dev libx11-dev libxi-dev libayatana-appindicator3-dev
           fi
 
       - name: Configure CMake

src/CMakeLists.txt

@@ -23,17 +23,17 @@ file(GLOB CAPI_SOURCES "capi/*.cpp" "capi/*.c")
 
 # Platform-specific source files
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-    file(GLOB PLATFORM_SOURCES "platform/linux/*_linux.cpp" "platform/linux/display_linux.cpp")
+    file(GLOB PLATFORM_SOURCES "platform/linux/*_linux.cpp")
     # Find packages for Linux
     find_package(PkgConfig REQUIRED)
     pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
     pkg_check_modules(X11 REQUIRED IMPORTED_TARGET x11)
     pkg_check_modules(XI REQUIRED IMPORTED_TARGET xi)
     pkg_check_modules(AYATANA_APPINDICATOR REQUIRED IMPORTED_TARGET ayatana-appindicator3-0.1)
 elseif(APPLE)
-    file(GLOB PLATFORM_SOURCES "platform/macos/*_macos.mm" "platform/macos/display_macos.mm")
+    file(GLOB PLATFORM_SOURCES "platform/macos/*_macos.mm")
 elseif(WIN32)
-    file(GLOB PLATFORM_SOURCES "platform/windows/*_windows.cpp" "platform/windows/display_windows.cpp")
+    file(GLOB PLATFORM_SOURCES "platform/windows/*_windows.cpp")
 else()
     set(PLATFORM_SOURCES "")
 endif()

src/platform/linux/window_linux.cpp

@@ -16,16 +16,17 @@ class Window::Impl {
 };
 
 Window::Window() : pimpl_(std::make_unique<Impl>(nullptr)) {
-  id = -1;
 }
 
 Window::Window(void* window) : pimpl_(std::make_unique<Impl>((GdkWindow*)window)) {
-  // Use pointer address as ID since GDK doesn't provide direct window IDs
-  id = pimpl_->gdk_window_ ? (WindowID)pimpl_->gdk_window_ : 0;
 }
 
 Window::~Window() {
+}
 
+WindowID Window::GetId() const{
+  // Use pointer address as ID since GDK doesn't provide direct window IDs
+  return pimpl_->gdk_window_ ? (WindowID)pimpl_->gdk_window_ : 0;
 }
 
 void Window::Focus() {