refactor: rebuild desktop client with Slint

src/gui/application/gui_application.h

@@ -1,20 +1,15 @@
 #ifndef CROSSDESK_GUI_APPLICATION_H_
 #define CROSSDESK_GUI_APPLICATION_H_
 
-#include <filesystem>
+#include <memory>
 #include <string>
-#include <vector>
 
-#include "IconsFontAwesome6.h"
-#include "imgui_impl_sdl3.h"
-#include "imgui_impl_sdlrenderer3.h"
-#include "imgui_internal.h"
 #include "runtime/gui_runtime.h"
 
 namespace crossdesk {
 
-// SDL/ImGui application shell. Feature state and protocol behavior live in
-// GuiRuntime and its composed controllers.
+// Slint application shell. GuiRuntime remains the owner of transport, media,
+// device, clipboard, transfer and settings behavior.
 class GuiApplication final : private GuiRuntime {
 public:
   GuiApplication();
@@ -23,88 +18,47 @@ public:
   int Run();
 
 private:
-  // Native window integration.
-  static SDL_HitTestResult HitTestCallback(SDL_Window *window,
-                                           const SDL_Point *area, void *data);
+  struct SlintUi;
 
-  // Application lifecycle.
   void InitializeLogger();
   void InitializeSettings();
-  void InitializeSDL();
+  bool InitializeSDL();
   void InitializeModules();
-  void InitializeMainWindow();
-  void MainLoop();
-  void HandleStreamWindow();
-  void HandleServerWindow();
-  void Cleanup();
-
-  // Window lifecycle and rendering.
-  int CreateMainWindow();
-  int DestroyMainWindow();
-  int CreateStreamWindow();
-  int DestroyStreamWindow();
-  int CreateServerWindow();
-  int DestroyServerWindow();
-  int SetupFontAndStyle(ImFont **system_chinese_font_out);
-  int DestroyMainWindowContext();
-  int DestroyStreamWindowContext();
-  int DestroyServerWindowContext();
-  int DrawMainWindow();
-  int DrawStreamWindow();
-  int DrawServerWindow();
-
-  // Views and dialogs.
-  int TitleBar(bool main_window);
-  int MainWindow();
-  int UpdateNotificationWindow();
-  int StreamWindow();
-  int ServerWindow();
-  int RemoteClientInfoWindow();
-  int LocalWindow();
-  int RemoteWindow();
-  int RecentConnectionsWindow();
-  int SettingWindow();
-  int SelfHostedServerWindow();
-  int ControlWindow(std::shared_ptr<RemoteSession> &props);
-  int ControlBar(std::shared_ptr<RemoteSession> &props);
-  int AboutWindow();
-  int StatusBar();
-  bool
-  ConnectionStatusWindow(std::shared_ptr<RemoteSession> &props);
-  int ShowRecentConnections();
-  int ConfirmDeleteConnection();
-  int EditRecentConnectionAliasWindow();
-  int OfflineWarningWindow();
-  int NetTrafficStats(std::shared_ptr<RemoteSession> &props);
-  int FileTransferWindow(std::shared_ptr<RemoteSession> &props);
-  void
-  DrawConnectionStatusText(std::shared_ptr<RemoteSession> &props);
-  void
-  DrawReceivingScreenText(std::shared_ptr<RemoteSession> &props);
-  bool OpenUrl(const std::string &url);
-  void Hyperlink(const std::string &label, const std::string &url,
-                 float window_width);
-  std::string OpenFileDialog(std::string title);
+  void InitializeUi();
+  void InitializeSystemTray();
   bool MinimizeMainWindowToTray();
-
-  // SDL event dispatch and input translation.
-  void UpdateRenderRect();
-  void ProcessSdlEvent(const SDL_Event &event);
-  int ProcessKeyboardEvent(const SDL_Event &event);
-  int ProcessMouseEvent(const SDL_Event &event);
-  void CloseTab(decltype(remote_sessions_)::iterator &it);
-
+  void BindMainCallbacks();
+  void BindStreamCallbacks();
+  void BindServerCallbacks();
+  void Tick();
+  void SyncMainWindow();
+  void SyncConnectionDialog();
+  void SyncPlatformDialogs();
+  void SyncStreamWindow();
+  void SyncServerWindow();
+  void UpdateLocalization();
+  void ResetSettingsUi();
+  void SaveSettingsFromUi();
 #if _WIN32 && CROSSDESK_PORTABLE
   void CheckPortableWindowsService();
-  int PortableServiceInstallWindow();
   void StartPortableWindowsServiceInstall();
   void JoinPortableWindowsServiceInstallThread();
 #endif
+  void ConnectFromUi(const std::string &remote_id);
+  void SelectStreamTab(int index);
+  void ReorderStreamTab(int from, float drop_x, float tab_width);
+  void CloseStreamTab(const std::string &remote_id);
+  void SendPointerInput(int button, int kind, float x, float y);
+  void SendScrollInput(float delta_x, float delta_y, float x, float y);
+  void SendKeyInput(const std::string &text, bool pressed, bool control,
+                    bool alt, bool shift, bool meta);
+  void Cleanup();
 
-#ifdef __APPLE__
-  int RequestPermissionWindow();
-  bool DrawToggleSwitch(const char *id, bool active, bool enabled);
-#endif
+  std::shared_ptr<RemoteSession> SelectedSession();
+  std::string OpenFileDialog(const std::string &title);
+  bool OpenUrl(const std::string &url);
+
+  std::unique_ptr<SlintUi> ui_;
 };
 
 } // namespace crossdesk