Fix PIMPL naming and const correctness in Windows platform code

Co-authored-by: lijy91 <3889523+lijy91@users.noreply.github.com>

Author: Copilot

src/platform/windows/window_manager_windows.cpp

@@ -29,7 +29,7 @@ class WindowManager::WindowManagerImpl {
   WindowManager* manager_;
 };
 
-WindowManager::WindowManager() : impl_(std::make_unique<WindowManagerImpl>(this)) {
+WindowManager::WindowManager() : pimpl_(std::make_unique<WindowManagerImpl>(this)) {
   SetupEventMonitoring();
 }
 
@@ -38,11 +38,11 @@ WindowManager::~WindowManager() {
 }
 
 void WindowManager::SetupEventMonitoring() {
-  impl_->SetupEventMonitoring();
+  pimpl_->SetupEventMonitoring();
 }
 
 void WindowManager::CleanupEventMonitoring() {
-  impl_->CleanupEventMonitoring();
+  pimpl_->CleanupEventMonitoring();
 }
 
 void WindowManager::DispatchWindowEvent(const Event& event) {

src/platform/windows/window_windows.cpp

@@ -272,7 +272,7 @@ void Window::SetMinimumSize(Size size) {
     // This is a placeholder implementation
 }
 
-Size Window::GetMinimumSize() {
+Size Window::GetMinimumSize() const {
     // Placeholder implementation
     return Size{0, 0};
 }
@@ -282,7 +282,7 @@ void Window::SetMaximumSize(Size size) {
     // This is a placeholder implementation
 }
 
-Size Window::GetMaximumSize() {
+Size Window::GetMaximumSize() const {
     // Placeholder implementation
     return Size{0, 0};
 }
@@ -409,7 +409,7 @@ void Window::SetAlwaysOnTop(bool is_always_on_top) {
     }
 }
 
-bool Window::IsAlwaysOnTop() {
+bool Window::IsAlwaysOnTop() const {
     if (pimpl_->hwnd_) {
         LONG_PTR exStyle = GetWindowLongPtr(pimpl_->hwnd_, GWL_EXSTYLE);
         return (exStyle & WS_EX_TOPMOST) != 0;
@@ -425,7 +425,7 @@ void Window::SetPosition(Point point) {
     }
 }
 
-Point Window::GetPosition() {
+Point Window::GetPosition() const {
     Point point = {0, 0};
 
     if (pimpl_->hwnd_) {
@@ -446,7 +446,7 @@ void Window::SetTitle(std::string title) {
     }
 }
 
-std::string Window::GetTitle() {
+std::string Window::GetTitle() const {
     if (pimpl_->hwnd_) {
         int length = GetWindowTextLength(pimpl_->hwnd_);
         if (length > 0) {

src/window.h

@@ -52,9 +52,9 @@ class Window {
   void SetContentSize(Size size);
   Size GetContentSize() const;
   void SetMinimumSize(Size size);
-  Size GetMinimumSize();
+  Size GetMinimumSize() const;
   void SetMaximumSize(Size size);
-  Size GetMaximumSize();
+  Size GetMaximumSize() const;
   void SetResizable(bool is_resizable);
   bool IsResizable() const;
   void SetMovable(bool is_movable);
@@ -68,11 +68,11 @@ class Window {
   void SetClosable(bool is_closable);
   bool IsClosable() const;
   void SetAlwaysOnTop(bool is_always_on_top);
-  bool IsAlwaysOnTop();
+  bool IsAlwaysOnTop() const;
   void SetPosition(Point point);
-  Point GetPosition();
+  Point GetPosition() const;
   void SetTitle(std::string title);
-  std::string GetTitle();
+  std::string GetTitle() const;
   void SetHasShadow(bool has_shadow);
   bool HasShadow() const;
   void SetOpacity(float opacity);