[fix] reset default cert fingerprint if mismatch

src/common/window_util_mac.h

@@ -0,0 +1,25 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-01-20
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _WINDOW_UTIL_MAC_H_
+#define _WINDOW_UTIL_MAC_H_
+
+struct SDL_Window;
+
+namespace crossdesk {
+
+// Best-effort: keep an SDL window above normal windows on macOS.
+// No-op on non-macOS builds.
+void MacSetWindowAlwaysOnTop(::SDL_Window* window, bool always_on_top);
+
+// Best-effort: exclude an SDL window from the Window menu and window cycling.
+// Note: Cmd-Tab switches apps (not individual windows), so this primarily
+// affects the Window menu and Cmd-` window cycling.
+void MacSetWindowExcludedFromWindowMenu(::SDL_Window* window, bool excluded);
+
+}  // namespace crossdesk
+
+#endif

src/common/window_util_mac.mm

@@ -0,0 +1,64 @@
+#include "window_util_mac.h"
+
+#if defined(__APPLE__)
+
+#include <SDL3/SDL.h>
+
+#import <Cocoa/Cocoa.h>
+
+namespace crossdesk {
+
+static NSWindow* GetNSWindowFromSDL(::SDL_Window* window) {
+  if (!window) {
+    return nil;
+  }
+
+#if !defined(SDL_PROP_WINDOW_COCOA_WINDOW_POINTER)
+  return nil;
+#else
+  SDL_PropertiesID props = SDL_GetWindowProperties(window);
+  void* cocoa_window_ptr =
+      SDL_GetPointerProperty(props, SDL_PROP_WINDOW_COCOA_WINDOW_POINTER, NULL);
+  if (!cocoa_window_ptr) {
+    return nil;
+  }
+  return (__bridge NSWindow*)cocoa_window_ptr;
+#endif
+}
+
+void MacSetWindowAlwaysOnTop(::SDL_Window* window, bool always_on_top) {
+  NSWindow* ns_window = GetNSWindowFromSDL(window);
+  if (!ns_window) {
+    (void)always_on_top;
+    return;
+  }
+
+  // Keep above normal windows.
+  const NSInteger level = always_on_top ? NSFloatingWindowLevel : NSNormalWindowLevel;
+  [ns_window setLevel:level];
+
+  // Optional: keep visible across Spaces/fullscreen. Safe as best-effort.
+  NSWindowCollectionBehavior behavior = [ns_window collectionBehavior];
+  behavior |= NSWindowCollectionBehaviorCanJoinAllSpaces;
+  behavior |= NSWindowCollectionBehaviorFullScreenAuxiliary;
+  [ns_window setCollectionBehavior:behavior];
+}
+
+void MacSetWindowExcludedFromWindowMenu(::SDL_Window* window, bool excluded) {
+  NSWindow* ns_window = GetNSWindowFromSDL(window);
+  if (!ns_window) {
+    (void)excluded;
+    return;
+  }
+
+  [ns_window setExcludedFromWindowsMenu:excluded];
+
+  NSWindowCollectionBehavior behavior = [ns_window collectionBehavior];
+  behavior |= NSWindowCollectionBehaviorIgnoresCycle;
+  behavior |= NSWindowCollectionBehaviorTransient;
+  [ns_window setCollectionBehavior:behavior];
+}
+
+}  // namespace crossdesk
+
+#endif  // __APPLE__

src/gui/assets/localization/localization.h

@@ -197,6 +197,12 @@ static std::vector<std::string> completed = {
     reinterpret_cast<const char*>(u8"已完成"), "Completed"};
 static std::vector<std::string> failed = {
     reinterpret_cast<const char*>(u8"失败"), "Failed"};
+static std::vector<std::string> controller = {
+    reinterpret_cast<const char*>(u8"控制端:"), "Controller:"};
+static std::vector<std::string> file_transfer = {
+    reinterpret_cast<const char*>(u8"文件传输:"), "File Transfer:"};
+static std::vector<std::string> connection_status = {
+    reinterpret_cast<const char*>(u8"连接状态:"), "Connection Status:"};
 
 #if _WIN32
 static std::vector<std::string> minimize_to_tray = {

src/gui/render.cpp

@@ -2,6 +2,12 @@
 
 #include <libyuv.h>
 
+#if defined(__linux__) && !defined(__APPLE__)
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#endif
+
+#include <cstring>
 #include <filesystem>
 #include <fstream>
 #include <iostream>
@@ -21,10 +27,123 @@
 #include "screen_capturer_factory.h"
 #include "version_checker.h"
 
+#if defined(__APPLE__)
+#include "window_util_mac.h"
+#endif
+
 #define NV12_BUFFER_SIZE 1280 * 720 * 3 / 2
 
 namespace crossdesk {
 
+namespace {
+#if defined(__linux__) && !defined(__APPLE__)
+inline bool X11GetDisplayAndWindow(SDL_Window* window, Display** display_out,
+                                   ::Window* x11_window_out) {
+  if (!window || !display_out || !x11_window_out) {
+    return false;
+  }
+
+#if !defined(SDL_PROP_WINDOW_X11_DISPLAY_POINTER) || \
+    !defined(SDL_PROP_WINDOW_X11_WINDOW_NUMBER)
+  // SDL build does not expose X11 window properties.
+  return false;
+#else
+  SDL_PropertiesID props = SDL_GetWindowProperties(window);
+  Display* display = (Display*)SDL_GetPointerProperty(
+      props, SDL_PROP_WINDOW_X11_DISPLAY_POINTER, NULL);
+  const Sint64 x11_window_num =
+      SDL_GetNumberProperty(props, SDL_PROP_WINDOW_X11_WINDOW_NUMBER, 0);
+  const ::Window x11_window = (::Window)x11_window_num;
+
+  if (!display || !x11_window) {
+    return false;
+  }
+
+  *display_out = display;
+  *x11_window_out = x11_window;
+  return true;
+#endif
+}
+
+inline void X11SendNetWmState(Display* display, ::Window x11_window,
+                              long action, Atom state1, Atom state2 = 0) {
+  if (!display || !x11_window) {
+    return;
+  }
+
+  const Atom wm_state = XInternAtom(display, "_NET_WM_STATE", False);
+
+  XEvent event;
+  memset(&event, 0, sizeof(event));
+  event.xclient.type = ClientMessage;
+  event.xclient.serial = 0;
+  event.xclient.send_event = True;
+  event.xclient.message_type = wm_state;
+  event.xclient.window = x11_window;
+  event.xclient.format = 32;
+  event.xclient.data.l[0] = action;
+  event.xclient.data.l[1] = (long)state1;
+  event.xclient.data.l[2] = (long)state2;
+  event.xclient.data.l[3] = 1;  // normal source indication
+  event.xclient.data.l[4] = 0;
+
+  XSendEvent(display, DefaultRootWindow(display), False,
+             SubstructureRedirectMask | SubstructureNotifyMask, &event);
+}
+
+inline void X11SetWindowTypeUtility(Display* display, ::Window x11_window) {
+  if (!display || !x11_window) {
+    return;
+  }
+
+  const Atom wm_window_type =
+      XInternAtom(display, "_NET_WM_WINDOW_TYPE", False);
+  const Atom wm_window_type_utility =
+      XInternAtom(display, "_NET_WM_WINDOW_TYPE_UTILITY", False);
+
+  XChangeProperty(display, x11_window, wm_window_type, XA_ATOM, 32,
+                  PropModeReplace, (unsigned char*)&wm_window_type_utility, 1);
+}
+
+inline void X11SetWindowAlwaysOnTop(SDL_Window* window) {
+  Display* display = nullptr;
+  ::Window x11_window = 0;
+  if (!X11GetDisplayAndWindow(window, &display, &x11_window)) {
+    return;
+  }
+
+  const Atom state_above = XInternAtom(display, "_NET_WM_STATE_ABOVE", False);
+  const Atom state_stays_on_top =
+      XInternAtom(display, "_NET_WM_STATE_STAYS_ON_TOP", False);
+
+  // Request _NET_WM_STATE_ADD for ABOVE + STAYS_ON_TOP.
+  X11SendNetWmState(display, x11_window, 1, state_above, state_stays_on_top);
+  XFlush(display);
+}
+
+inline void X11SetWindowSkipTaskbar(SDL_Window* window) {
+  Display* display = nullptr;
+  ::Window x11_window = 0;
+  if (!X11GetDisplayAndWindow(window, &display, &x11_window)) {
+    return;
+  }
+
+  const Atom skip_taskbar =
+      XInternAtom(display, "_NET_WM_STATE_SKIP_TASKBAR", False);
+  const Atom skip_pager =
+      XInternAtom(display, "_NET_WM_STATE_SKIP_PAGER", False);
+
+  // Request _NET_WM_STATE_ADD for SKIP_TASKBAR + SKIP_PAGER.
+  X11SendNetWmState(display, x11_window, 1, skip_taskbar, skip_pager);
+
+  // Hint the WM that this is an auxiliary/utility window.
+  X11SetWindowTypeUtility(display, x11_window);
+
+  XFlush(display);
+}
+#endif
+}  // namespace
+
 std::vector<char> Render::SerializeRemoteAction(const RemoteAction& action) {
   std::vector<char> buffer;
   buffer.push_back(static_cast<char>(action.type));
@@ -131,6 +250,20 @@ SDL_HitTestResult Render::HitTestCallback(SDL_Window* window,
     return SDL_HITTEST_NORMAL;
   }
 
+  // Server window: OS-level dragging for the title bar, but keep the left-side
+  // collapse/expand button clickable.
+  if (render->server_window_ && window == render->server_window_) {
+    const float title_h = render->server_window_title_bar_height_;
+    const float button_w = title_h;
+    if (area->y >= 0 && area->y < title_h) {
+      if (area->x >= 0 && area->x < button_w) {
+        return SDL_HITTEST_NORMAL;
+      }
+      return SDL_HITTEST_DRAGGABLE;
+    }
+    return SDL_HITTEST_NORMAL;
+  }
+
   int window_width, window_height;
   SDL_GetWindowSize(window, &window_width, &window_height);
 
@@ -696,7 +829,7 @@ int Render::CreateConnectionPeer() {
 
   params_.on_signal_status = OnSignalStatusCb;
   params_.on_connection_status = OnConnectionStatusCb;
-  params_.net_status_report = NetStatusReport;
+  params_.on_net_status_report = OnNetStatusReport;
 
   params_.user_data = this;
 
@@ -815,6 +948,12 @@ int Render::CreateMainWindow() {
     main_window_height_ = (int)(main_window_height_default_ * dpi_scale_);
     stream_window_width_ = (int)(stream_window_width_default_ * dpi_scale_);
     stream_window_height_ = (int)(stream_window_height_default_ * dpi_scale_);
+    server_window_width_ = (int)(server_window_width_default_ * dpi_scale_);
+    server_window_height_ = (int)(server_window_height_default_ * dpi_scale_);
+    server_window_normal_width_ =
+        (int)(server_window_width_default_ * dpi_scale_);
+    server_window_normal_height_ =
+        (int)(server_window_height_default_ * dpi_scale_);
 
     SDL_SetWindowSize(main_window_, (int)main_window_width_,
                       (int)main_window_height_);
@@ -963,6 +1102,40 @@ int Render::CreateServerWindow() {
     return -1;
   }
 
+#if _WIN32
+  // Hide server window from the taskbar by making it a tool window.
+  {
+    SDL_PropertiesID server_props = SDL_GetWindowProperties(server_window_);
+    HWND server_hwnd = (HWND)SDL_GetPointerProperty(
+        server_props, SDL_PROP_WINDOW_WIN32_HWND_POINTER, NULL);
+
+    if (server_hwnd) {
+      LONG_PTR ex_style = GetWindowLongPtr(server_hwnd, GWL_EXSTYLE);
+      ex_style |= WS_EX_TOOLWINDOW;
+      ex_style &= ~WS_EX_APPWINDOW;
+      SetWindowLongPtr(server_hwnd, GWL_EXSTYLE, ex_style);
+
+      // Keep the server window above normal windows.
+      SetWindowPos(server_hwnd, HWND_TOPMOST, 0, 0, 0, 0,
+                   SWP_NOMOVE | SWP_NOSIZE | SWP_FRAMECHANGED | SWP_NOACTIVATE);
+    }
+  }
+#endif
+
+#if defined(__linux__) && !defined(__APPLE__)
+  // Best-effort keep above other windows on X11.
+  X11SetWindowAlwaysOnTop(server_window_);
+  // Best-effort hide from taskbar on X11.
+  X11SetWindowSkipTaskbar(server_window_);
+#endif
+
+#if defined(__APPLE__)
+  // Best-effort keep above other windows on macOS.
+  MacSetWindowAlwaysOnTop(server_window_, true);
+  // Best-effort exclude from Window menu / window cycling.
+  MacSetWindowExcludedFromWindowMenu(server_window_, true);
+#endif
+
   // Set window position to bottom-right corner
   SDL_Rect display_bounds;
   if (SDL_GetDisplayUsableBounds(SDL_GetDisplayForWindow(server_window_),
@@ -1448,49 +1621,6 @@ void Render::MainLoop() {
     }
 
     UpdateInteractions();
-
-    if (need_to_send_host_info_) {
-      RemoteAction remote_action;
-      remote_action.i.display_num = display_info_list_.size();
-      remote_action.i.display_list =
-          (char**)malloc(remote_action.i.display_num * sizeof(char*));
-      remote_action.i.left =
-          (int*)malloc(remote_action.i.display_num * sizeof(int));
-      remote_action.i.top =
-          (int*)malloc(remote_action.i.display_num * sizeof(int));
-      remote_action.i.right =
-          (int*)malloc(remote_action.i.display_num * sizeof(int));
-      remote_action.i.bottom =
-          (int*)malloc(remote_action.i.display_num * sizeof(int));
-      for (int i = 0; i < remote_action.i.display_num; i++) {
-        LOG_INFO("Local display [{}:{}]", i + 1, display_info_list_[i].name);
-        remote_action.i.display_list[i] =
-            (char*)malloc(display_info_list_[i].name.length() + 1);
-        strncpy(remote_action.i.display_list[i],
-                display_info_list_[i].name.c_str(),
-                display_info_list_[i].name.length());
-        remote_action.i.display_list[i][display_info_list_[i].name.length()] =
-            '\0';
-        remote_action.i.left[i] = display_info_list_[i].left;
-        remote_action.i.top[i] = display_info_list_[i].top;
-        remote_action.i.right[i] = display_info_list_[i].right;
-        remote_action.i.bottom[i] = display_info_list_[i].bottom;
-      }
-
-      std::string host_name = GetHostName();
-      remote_action.type = ControlType::host_infomation;
-      memcpy(&remote_action.i.host_name, host_name.data(), host_name.size());
-      remote_action.i.host_name[host_name.size()] = '\0';
-      remote_action.i.host_name_size = host_name.size();
-
-      std::string msg = remote_action.to_json();
-      int ret = SendReliableDataFrame(peer_, msg.data(), msg.size(),
-                                      control_data_label_.c_str());
-      FreeRemoteAction(remote_action);
-      if (0 == ret) {
-        need_to_send_host_info_ = false;
-      }
-    }
   }
 }
 
@@ -1607,13 +1737,19 @@ void Render::CleanupFactories() {
 void Render::CleanupPeer(std::shared_ptr<SubStreamWindowProperties> props) {
   SDL_FlushEvent(STREAM_REFRESH_EVENT);
 
-  if (props->dst_buffer_) {
+  std::shared_ptr<std::vector<unsigned char>> frame_snapshot;
-    size_t buffer_size = props->dst_buffer_capacity_;
+  int video_width = 0;
-    std::vector<unsigned char> buffer_copy(buffer_size);
+  int video_height = 0;
-    memcpy(buffer_copy.data(), props->dst_buffer_, buffer_size);
+  {
+    std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+    frame_snapshot = props->front_frame_;
+    video_width = props->video_width_;
+    video_height = props->video_height_;
+  }
 
-    int video_width = props->video_width_;
+  if (frame_snapshot && !frame_snapshot->empty() && video_width > 0 &&
-    int video_height = props->video_height_;
+      video_height > 0) {
+    std::vector<unsigned char> buffer_copy(*frame_snapshot);
     std::string remote_id = props->remote_id_;
     std::string remote_host_name = props->remote_host_name_;
     std::string password =
@@ -1694,22 +1830,47 @@ void Render::CleanSubStreamWindowProperties(
     props->stream_texture_ = nullptr;
   }
 
-  if (props->dst_buffer_) {
+  {
-    delete[] props->dst_buffer_;
+    std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
-    props->dst_buffer_ = nullptr;
+    props->front_frame_.reset();
+    props->back_frame_.reset();
+    props->video_width_ = 0;
+    props->video_height_ = 0;
+    props->video_size_ = 0;
+    props->render_rect_dirty_ = true;
+    props->stream_cleanup_pending_ = false;
   }
 }
 
+std::shared_ptr<Render::SubStreamWindowProperties>
+Render::GetSubStreamWindowPropertiesByRemoteId(const std::string& remote_id) {
+  if (remote_id.empty()) {
+    return nullptr;
+  }
+
+  std::shared_lock lock(client_properties_mutex_);
+  auto it = client_properties_.find(remote_id);
+  if (it == client_properties_.end()) {
+    return nullptr;
+  }
+  return it->second;
+}
+
 void Render::StartFileTransfer(std::shared_ptr<SubStreamWindowProperties> props,
                                const std::filesystem::path& file_path,
-                               const std::string& file_label) {
+                               const std::string& file_label,
-  if (!props || !props->peer_) {
+                               const std::string& remote_id) {
-    LOG_ERROR("StartFileTransfer: invalid props or peer");
+  const bool is_global = (props == nullptr);
+  PeerPtr* peer = is_global ? peer_ : props->peer_;
+  if (!peer) {
+    LOG_ERROR("StartFileTransfer: invalid peer");
     return;
   }
 
   bool expected = false;
-  if (!props->file_sending_.compare_exchange_strong(expected, true)) {
+  if (!(is_global ? file_transfer_.file_sending_
+                  : props->file_transfer_.file_sending_)
+           .compare_exchange_strong(expected, true)) {
     // Already sending, this should not happen if called correctly
     LOG_WARN(
         "StartFileTransfer called but file_sending_ is already true, "
@@ -1718,13 +1879,19 @@ void Render::StartFileTransfer(std::shared_ptr<SubStreamWindowProperties> props,
     return;
   }
 
-  auto peer = props->peer_;
   auto props_weak = std::weak_ptr<SubStreamWindowProperties>(props);
   Render* render_ptr = this;
 
-  std::thread([peer, file_path, file_label, props_weak, render_ptr]() {
+  std::thread([peer, file_path, file_label, props_weak, render_ptr, remote_id,
+               is_global]() {
     auto props_locked = props_weak.lock();
-    if (!props_locked) {
+
+    FileTransferState* state = nullptr;
+    if (props_locked) {
+      state = &props_locked->file_transfer_;
+    } else if (is_global) {
+      state = &render_ptr->file_transfer_;
+    } else {
       return;
     }
 
@@ -1732,49 +1899,50 @@ void Render::StartFileTransfer(std::shared_ptr<SubStreamWindowProperties> props,
     uint64_t total_size = std::filesystem::file_size(file_path, ec);
     if (ec) {
       LOG_ERROR("Failed to get file size: {}", ec.message().c_str());
-      props_locked->file_sending_ = false;
+      state->file_sending_ = false;
       return;
     }
 
-    props_locked->file_sent_bytes_ = 0;
+    state->file_sent_bytes_ = 0;
-    props_locked->file_total_bytes_ = total_size;
+    state->file_total_bytes_ = total_size;
-    props_locked->file_send_rate_bps_ = 0;
+    state->file_send_rate_bps_ = 0;
-    props_locked->file_transfer_window_visible_ = true;
+    state->file_transfer_window_visible_ = true;
     {
-      std::lock_guard<std::mutex> lock(props_locked->file_transfer_mutex_);
+      std::lock_guard<std::mutex> lock(state->file_transfer_mutex_);
-      props_locked->file_send_start_time_ = std::chrono::steady_clock::now();
+      state->file_send_start_time_ = std::chrono::steady_clock::now();
-      props_locked->file_send_last_update_time_ =
+      state->file_send_last_update_time_ = state->file_send_start_time_;
-          props_locked->file_send_start_time_;
+      state->file_send_last_bytes_ = 0;
-      props_locked->file_send_last_bytes_ = 0;
     }
 
     LOG_INFO(
         "File transfer started: {} ({} bytes), file_sending_={}, "
         "total_bytes_={}",
-        file_path.filename().string(), total_size,
+        file_path.filename().string(), total_size, state->file_sending_.load(),
-        props_locked->file_sending_.load(),
+        state->file_total_bytes_.load());
-        props_locked->file_total_bytes_.load());
 
     FileSender sender;
     uint32_t file_id = FileSender::NextFileId();
 
-    {
+    if (props_locked) {
       std::lock_guard<std::shared_mutex> lock(
           render_ptr->file_id_to_props_mutex_);
       render_ptr->file_id_to_props_[file_id] = props_weak;
+    } else {
+      std::lock_guard<std::shared_mutex> lock(
+          render_ptr->file_id_to_transfer_state_mutex_);
+      render_ptr->file_id_to_transfer_state_[file_id] = state;
     }
 
-    props_locked->current_file_id_ = file_id;
+    state->current_file_id_ = file_id;
 
     // Update file transfer list: mark as sending
     // Find the queued file that matches the exact file path
     {
-      std::lock_guard<std::mutex> lock(props_locked->file_transfer_list_mutex_);
+      std::lock_guard<std::mutex> lock(state->file_transfer_list_mutex_);
-      for (auto& info : props_locked->file_transfer_list_) {
+      for (auto& info : state->file_transfer_list_) {
         if (info.file_path == file_path &&
-            info.status ==
+            info.status == FileTransferState::FileTransferStatus::Queued) {
-                SubStreamWindowProperties::FileTransferStatus::Queued) {
+          info.status = FileTransferState::FileTransferStatus::Sending;
-          info.status = SubStreamWindowProperties::FileTransferStatus::Sending;
           info.file_id = file_id;
           info.file_size = total_size;
           info.sent_bytes = 0;
@@ -1783,81 +1951,88 @@ void Render::StartFileTransfer(std::shared_ptr<SubStreamWindowProperties> props,
       }
     }
 
-    props_locked->file_transfer_window_visible_ = true;
+    state->file_transfer_window_visible_ = true;
 
     // Progress will be updated via ACK from receiver
     int ret = sender.SendFile(
         file_path, file_path.filename().string(),
-        [peer, file_label](const char* buf, size_t sz) -> int {
+        [peer, file_label, remote_id](const char* buf, size_t sz) -> int {
-          return SendReliableDataFrame(peer, buf, sz, file_label.c_str());
+          if (remote_id.empty()) {
+            return SendReliableDataFrame(peer, buf, sz, file_label.c_str());
+          } else {
+            return SendReliableDataFrameToPeer(
+                peer, buf, sz, file_label.c_str(), remote_id.c_str(),
+                remote_id.size());
+          }
         },
         64 * 1024, file_id);
 
     // file_sending_ should remain true until we receive the final ACK from
     // receiver
-    auto props_locked_final = props_weak.lock();
+    // On error, set file_sending_ to false immediately to allow next file
-    if (props_locked_final) {
+    if (ret != 0) {
-      // On error, set file_sending_ to false immediately to allow next file
+      state->file_sending_ = false;
-      if (ret != 0) {
+      state->file_transfer_window_visible_ = false;
-        props_locked_final->file_sending_ = false;
+      state->file_sent_bytes_ = 0;
-        props_locked_final->file_transfer_window_visible_ = false;
+      state->file_total_bytes_ = 0;
-        props_locked_final->file_sent_bytes_ = 0;
+      state->file_send_rate_bps_ = 0;
-        props_locked_final->file_total_bytes_ = 0;
+      state->current_file_id_ = 0;
-        props_locked_final->file_send_rate_bps_ = 0;
-        props_locked_final->current_file_id_ = 0;
 
-        // Unregister file_id mapping on error
+      // Unregister file_id mapping on error
-        {
+      if (props_locked) {
-          std::lock_guard<std::shared_mutex> lock(
+        std::lock_guard<std::shared_mutex> lock(
-              render_ptr->file_id_to_props_mutex_);
+            render_ptr->file_id_to_props_mutex_);
-          render_ptr->file_id_to_props_.erase(file_id);
+        render_ptr->file_id_to_props_.erase(file_id);
-        }
+      } else {
+        std::lock_guard<std::shared_mutex> lock(
+            render_ptr->file_id_to_transfer_state_mutex_);
+        render_ptr->file_id_to_transfer_state_.erase(file_id);
+      }
 
-        // Update file transfer list: mark as failed
+      // Update file transfer list: mark as failed
-        {
+      {
-          std::lock_guard<std::mutex> lock(
+        std::lock_guard<std::mutex> lock(state->file_transfer_list_mutex_);
-              props_locked_final->file_transfer_list_mutex_);
+        for (auto& info : state->file_transfer_list_) {
-          for (auto& info : props_locked_final->file_transfer_list_) {
+          if (info.file_id == file_id) {
-            if (info.file_id == file_id) {
+            info.status = FileTransferState::FileTransferStatus::Failed;
-              info.status =
+            break;
-                  SubStreamWindowProperties::FileTransferStatus::Failed;
-              break;
-            }
           }
         }
-
-        LOG_ERROR("FileSender::SendFile failed for [{}], ret={}",
-                  file_path.string().c_str(), ret);
-
-        render_ptr->ProcessFileQueue(props_locked_final);
       }
+
+      LOG_ERROR("FileSender::SendFile failed for [{}], ret={}",
+                file_path.string().c_str(), ret);
+
+      render_ptr->ProcessFileQueue(props_locked);
     }
   }).detach();
 }
 
 void Render::ProcessFileQueue(
     std::shared_ptr<SubStreamWindowProperties> props) {
-  if (!props) {
+  FileTransferState* state = props ? &props->file_transfer_ : &file_transfer_;
+  if (!state) {
     return;
   }
 
-  if (props->file_sending_.load()) {
+  if (state->file_sending_.load()) {
     return;
   }
 
-  SubStreamWindowProperties::QueuedFile queued_file;
+  FileTransferState::QueuedFile queued_file;
   {
-    std::lock_guard<std::mutex> lock(props->file_queue_mutex_);
+    std::lock_guard<std::mutex> lock(state->file_queue_mutex_);
-    if (props->file_send_queue_.empty()) {
+    if (state->file_send_queue_.empty()) {
       return;
     }
-    queued_file = props->file_send_queue_.front();
+    queued_file = state->file_send_queue_.front();
-    props->file_send_queue_.pop();
+    state->file_send_queue_.pop();
   }
 
   LOG_INFO("Processing next file in queue: {}",
            queued_file.file_path.string().c_str());
-  StartFileTransfer(props, queued_file.file_path, queued_file.file_label);
+  StartFileTransfer(props, queued_file.file_path, queued_file.file_label,
+                    queued_file.remote_id);
 }
 
 void Render::UpdateRenderRect() {
@@ -1949,10 +2124,22 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
         {
           // std::shared_lock lock(client_properties_mutex_);
           for (auto& [host_name, props] : client_properties_) {
-            thumbnail_->SaveToThumbnail(
+            std::shared_ptr<std::vector<unsigned char>> frame_snapshot;
-                (char*)props->dst_buffer_, props->video_width_,
+            int video_width = 0;
-                props->video_height_, host_name, props->remote_host_name_,
+            int video_height = 0;
-                props->remember_password_ ? props->remote_password_ : "");
+            {
+              std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+              frame_snapshot = props->front_frame_;
+              video_width = props->video_width_;
+              video_height = props->video_height_;
+            }
+            if (frame_snapshot && !frame_snapshot->empty() && video_width > 0 &&
+                video_height > 0) {
+              thumbnail_->SaveToThumbnail(
+                  (char*)frame_snapshot->data(), video_width, video_height,
+                  host_name, props->remote_host_name_,
+                  props->remember_password_ ? props->remote_password_ : "");
+            }
 
             if (props->peer_) {
               std::string client_id = (host_name == client_id_)
@@ -2028,10 +2215,7 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
       }
       break;
     case SDL_EVENT_DROP_FILE:
-      if (stream_window_ &&
+      ProcessFileDropEvent(event);
-          SDL_GetWindowID(stream_window_) == event.window.windowID) {
-        ProcessFileDropEvent(event);
-      }
       break;
 
     case SDL_EVENT_MOUSE_MOTION:
@@ -2049,18 +2233,52 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
         if (!props) {
           break;
         }
-        if (props->video_width_ <= 0 || props->video_height_ <= 0) {
+        std::shared_ptr<std::vector<unsigned char>> frame_snapshot;
+        int video_width = 0;
+        int video_height = 0;
+        bool render_rect_dirty = false;
+        bool cleanup_pending = false;
+        {
+          std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+          cleanup_pending = props->stream_cleanup_pending_;
+          if (!cleanup_pending) {
+            frame_snapshot = props->front_frame_;
+            video_width = props->video_width_;
+            video_height = props->video_height_;
+          }
+          render_rect_dirty = props->render_rect_dirty_;
+        }
+
+        if (cleanup_pending) {
+          if (props->stream_texture_) {
+            SDL_DestroyTexture(props->stream_texture_);
+            props->stream_texture_ = nullptr;
+          }
+          {
+            std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+            props->stream_cleanup_pending_ = false;
+          }
+
+          if (render_rect_dirty) {
+            UpdateRenderRect();
+            std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+            props->render_rect_dirty_ = false;
+          }
           break;
         }
-        if (!props->dst_buffer_) {
+
+        if (video_width <= 0 || video_height <= 0) {
+          break;
+        }
+        if (!frame_snapshot || frame_snapshot->empty()) {
           break;
         }
 
         if (props->stream_texture_) {
-          if (props->video_width_ != props->texture_width_ ||
+          if (video_width != props->texture_width_ ||
-              props->video_height_ != props->texture_height_) {
+              video_height != props->texture_height_) {
-            props->texture_width_ = props->video_width_;
+            props->texture_width_ = video_width;
-            props->texture_height_ = props->video_height_;
+            props->texture_height_ = video_height;
 
             SDL_DestroyTexture(props->stream_texture_);
             // props->stream_texture_ = SDL_CreateTexture(
@@ -2085,8 +2303,8 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
             SDL_DestroyProperties(nvProps);
           }
         } else {
-          props->texture_width_ = props->video_width_;
+          props->texture_width_ = video_width;
-          props->texture_height_ = props->video_height_;
+          props->texture_height_ = video_height;
           // props->stream_texture_ = SDL_CreateTexture(
           //     stream_renderer_, stream_pixformat_,
           //     SDL_TEXTUREACCESS_STREAMING, props->texture_width_,
@@ -2107,69 +2325,124 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
           SDL_DestroyProperties(nvProps);
         }
 
-        SDL_UpdateTexture(props->stream_texture_, NULL, props->dst_buffer_,
+        SDL_UpdateTexture(props->stream_texture_, NULL, frame_snapshot->data(),
                           props->texture_width_);
+
+        if (render_rect_dirty) {
+          UpdateRenderRect();
+          std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+          props->render_rect_dirty_ = false;
+        }
       }
       break;
   }
 }
 
 void Render::ProcessFileDropEvent(const SDL_Event& event) {
+  if (!((stream_window_ &&
+         SDL_GetWindowID(stream_window_) == event.window.windowID) ||
+        (server_window_ &&
+         SDL_GetWindowID(server_window_) == event.window.windowID))) {
+    return;
+  }
+
   if (event.type != SDL_EVENT_DROP_FILE) {
     return;
   }
 
-  if (!stream_window_inited_) {
+  if (SDL_GetWindowID(stream_window_) == event.window.windowID) {
-    return;
+    if (!stream_window_inited_) {
-  }
+      return;
-
-  std::shared_lock lock(client_properties_mutex_);
-  for (auto& [_, props] : client_properties_) {
-    if (props->tab_selected_) {
-      if (event.drop.data == nullptr) {
-        LOG_ERROR("ProcessFileDropEvent: drop event data is null");
-        break;
-      }
-
-      if (!props || !props->peer_) {
-        LOG_ERROR("ProcessFileDropEvent: invalid props or peer");
-        break;
-      }
-
-      std::string utf8_path = static_cast<const char*>(event.drop.data);
-      std::filesystem::path file_path = std::filesystem::u8path(utf8_path);
-
-      // Check if file exists
-      std::error_code ec;
-      if (!std::filesystem::exists(file_path, ec)) {
-        LOG_ERROR("ProcessFileDropEvent: file does not exist: {}",
-                  file_path.string().c_str());
-        break;
-      }
-
-      // Check if it's a regular file
-      if (!std::filesystem::is_regular_file(file_path, ec)) {
-        LOG_ERROR("ProcessFileDropEvent: path is not a regular file: {}",
-                  file_path.string().c_str());
-        break;
-      }
-
-      // Get file size
-      uint64_t file_size = std::filesystem::file_size(file_path, ec);
-      if (ec) {
-        LOG_ERROR("ProcessFileDropEvent: failed to get file size: {}",
-                  ec.message().c_str());
-        break;
-      }
-
-      LOG_INFO("Drop file [{}] to send (size: {} bytes)", event.drop.data,
-               file_size);
-
-      // Use ProcessSelectedFile to handle the file processing
-      ProcessSelectedFile(utf8_path, props, props->file_label_);
-
-      break;
     }
+
+    std::shared_lock lock(client_properties_mutex_);
+    for (auto& [_, props] : client_properties_) {
+      if (props->tab_selected_) {
+        if (event.drop.data == nullptr) {
+          LOG_ERROR("ProcessFileDropEvent: drop event data is null");
+          break;
+        }
+
+        if (!props || !props->peer_) {
+          LOG_ERROR("ProcessFileDropEvent: invalid props or peer");
+          break;
+        }
+
+        std::string utf8_path = static_cast<const char*>(event.drop.data);
+        std::filesystem::path file_path = std::filesystem::u8path(utf8_path);
+
+        // Check if file exists
+        std::error_code ec;
+        if (!std::filesystem::exists(file_path, ec)) {
+          LOG_ERROR("ProcessFileDropEvent: file does not exist: {}",
+                    file_path.string().c_str());
+          break;
+        }
+
+        // Check if it's a regular file
+        if (!std::filesystem::is_regular_file(file_path, ec)) {
+          LOG_ERROR("ProcessFileDropEvent: path is not a regular file: {}",
+                    file_path.string().c_str());
+          break;
+        }
+
+        // Get file size
+        uint64_t file_size = std::filesystem::file_size(file_path, ec);
+        if (ec) {
+          LOG_ERROR("ProcessFileDropEvent: failed to get file size: {}",
+                    ec.message().c_str());
+          break;
+        }
+
+        LOG_INFO("Drop file [{}] to send (size: {} bytes)", event.drop.data,
+                 file_size);
+
+        // Use ProcessSelectedFile to handle the file processing
+        ProcessSelectedFile(utf8_path, props, props->file_label_);
+
+        break;
+      }
+    }
+  } else if (SDL_GetWindowID(server_window_) == event.window.windowID) {
+    if (!server_window_inited_) {
+      return;
+    }
+
+    if (event.drop.data == nullptr) {
+      LOG_ERROR("ProcessFileDropEvent: drop event data is null");
+      return;
+    }
+
+    std::string utf8_path = static_cast<const char*>(event.drop.data);
+    std::filesystem::path file_path = std::filesystem::u8path(utf8_path);
+
+    // Check if file exists
+    std::error_code ec;
+    if (!std::filesystem::exists(file_path, ec)) {
+      LOG_ERROR("ProcessFileDropEvent: file does not exist: {}",
+                file_path.string().c_str());
+      return;
+    }
+
+    // Check if it's a regular file
+    if (!std::filesystem::is_regular_file(file_path, ec)) {
+      LOG_ERROR("ProcessFileDropEvent: path is not a regular file: {}",
+                file_path.string().c_str());
+      return;
+    }
+
+    // Get file size
+    uint64_t file_size = std::filesystem::file_size(file_path, ec);
+    if (ec) {
+      LOG_ERROR("ProcessFileDropEvent: failed to get file size: {}",
+                ec.message().c_str());
+      return;
+    }
+
+    LOG_INFO("Drop file [{}] on server window (size: {} bytes)",
+             event.drop.data, file_size);
+
+    // Handle the dropped file on server window as needed
   }
 }
 }  // namespace crossdesk

src/gui/render.h

@@ -42,6 +42,41 @@
 namespace crossdesk {
 class Render {
  public:
+  struct FileTransferState {
+    std::atomic<bool> file_sending_ = false;
+    std::atomic<uint64_t> file_sent_bytes_ = 0;
+    std::atomic<uint64_t> file_total_bytes_ = 0;
+    std::atomic<uint32_t> file_send_rate_bps_ = 0;
+    std::mutex file_transfer_mutex_;
+    std::chrono::steady_clock::time_point file_send_start_time_;
+    std::chrono::steady_clock::time_point file_send_last_update_time_;
+    uint64_t file_send_last_bytes_ = 0;
+    bool file_transfer_window_visible_ = false;
+    std::atomic<uint32_t> current_file_id_{0};
+
+    struct QueuedFile {
+      std::filesystem::path file_path;
+      std::string file_label;
+      std::string remote_id;
+    };
+    std::queue<QueuedFile> file_send_queue_;
+    std::mutex file_queue_mutex_;
+
+    enum class FileTransferStatus { Queued, Sending, Completed, Failed };
+
+    struct FileTransferInfo {
+      std::string file_name;
+      std::filesystem::path file_path;
+      uint64_t file_size = 0;
+      FileTransferStatus status = FileTransferStatus::Queued;
+      uint64_t sent_bytes = 0;
+      uint32_t file_id = 0;
+      uint32_t rate_bps = 0;
+    };
+    std::vector<FileTransferInfo> file_transfer_list_;
+    std::mutex file_transfer_list_mutex_;
+  };
+
   struct SubStreamWindowProperties {
     Params params_;
     PeerPtr* peer_ = nullptr;
@@ -88,8 +123,13 @@ class Render {
     float mouse_diff_control_bar_pos_y_ = 0;
     double control_bar_button_pressed_time_ = 0;
     double net_traffic_stats_button_pressed_time_ = 0;
-    unsigned char* dst_buffer_ = nullptr;
+    // Double-buffered NV12 frame storage. Written by decode callback thread,
-    size_t dst_buffer_capacity_ = 0;
+    // consumed by SDL main thread.
+    std::mutex video_frame_mutex_;
+    std::shared_ptr<std::vector<unsigned char>> front_frame_;
+    std::shared_ptr<std::vector<unsigned char>> back_frame_;
+    bool render_rect_dirty_ = false;
+    bool stream_cleanup_pending_ = false;
     float mouse_pos_x_ = 0;
     float mouse_pos_y_ = 0;
     float mouse_pos_x_last_ = 0;
@@ -129,38 +169,10 @@ class Render {
     std::chrono::steady_clock::time_point last_time_;
     XNetTrafficStats net_traffic_stats_;
 
-    // File transfer progress
+    using QueuedFile = FileTransferState::QueuedFile;
-    std::atomic<bool> file_sending_ = false;
+    using FileTransferStatus = FileTransferState::FileTransferStatus;
-    std::atomic<uint64_t> file_sent_bytes_ = 0;
+    using FileTransferInfo = FileTransferState::FileTransferInfo;
-    std::atomic<uint64_t> file_total_bytes_ = 0;
+    FileTransferState file_transfer_;
-    std::atomic<uint32_t> file_send_rate_bps_ = 0;
-    std::mutex file_transfer_mutex_;
-    std::chrono::steady_clock::time_point file_send_start_time_;
-    std::chrono::steady_clock::time_point file_send_last_update_time_;
-    uint64_t file_send_last_bytes_ = 0;
-    bool file_transfer_window_visible_ = false;
-    std::atomic<uint32_t> current_file_id_{0};
-
-    struct QueuedFile {
-      std::filesystem::path file_path;
-      std::string file_label;
-    };
-    std::queue<QueuedFile> file_send_queue_;
-    std::mutex file_queue_mutex_;
-
-    enum class FileTransferStatus { Queued, Sending, Completed, Failed };
-
-    struct FileTransferInfo {
-      std::string file_name;
-      std::filesystem::path file_path;
-      uint64_t file_size = 0;
-      FileTransferStatus status = FileTransferStatus::Queued;
-      uint64_t sent_bytes = 0;
-      uint32_t file_id = 0;
-      uint32_t rate_bps = 0;
-    };
-    std::vector<FileTransferInfo> file_transfer_list_;
-    std::mutex file_transfer_list_mutex_;
   };
 
  public:
@@ -193,9 +205,13 @@ class Render {
 
   void ProcessFileDropEvent(const SDL_Event& event);
 
-  void ProcessSelectedFile(const std::string& path,
+  void ProcessSelectedFile(
-                           std::shared_ptr<SubStreamWindowProperties>& props,
+      const std::string& path,
-                           const std::string& file_label);
+      const std::shared_ptr<SubStreamWindowProperties>& props,
+      const std::string& file_label, const std::string& remote_id = "");
+
+  std::shared_ptr<SubStreamWindowProperties>
+  GetSubStreamWindowPropertiesByRemoteId(const std::string& remote_id);
 
  private:
   int CreateStreamRenderWindow();
@@ -204,6 +220,7 @@ class Render {
   int UpdateNotificationWindow();
   int StreamWindow();
   int ServerWindow();
+  int RemoteClientInfoWindow();
   int LocalWindow();
   int RemoteWindow();
   int RecentConnectionsWindow();
@@ -220,6 +237,7 @@ class Render {
   void Hyperlink(const std::string& label, const std::string& url,
                  const float window_width);
   int FileTransferWindow(std::shared_ptr<SubStreamWindowProperties>& props);
+  std::string OpenFileDialog(std::string title);
 
  private:
   int ConnectTo(const std::string& remote_id, const char* password,
@@ -272,11 +290,11 @@ class Render {
   static void OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
                                    size_t user_id_size, void* user_data);
 
-  static void NetStatusReport(const char* client_id, size_t client_id_size,
+  static void OnNetStatusReport(const char* client_id, size_t client_id_size,
-                              TraversalMode mode,
+                                TraversalMode mode,
-                              const XNetTrafficStats* net_traffic_stats,
+                                const XNetTrafficStats* net_traffic_stats,
-                              const char* user_id, const size_t user_id_size,
+                                const char* user_id, const size_t user_id_size,
-                              void* user_data);
+                                void* user_data);
 
   static SDL_HitTestResult HitTestCallback(SDL_Window* window,
                                            const SDL_Point* area, void* data);
@@ -317,7 +335,8 @@ class Render {
   // File transfer helper functions
   void StartFileTransfer(std::shared_ptr<SubStreamWindowProperties> props,
                          const std::filesystem::path& file_path,
-                         const std::string& file_label);
+                         const std::string& file_label,
+                         const std::string& remote_id = "");
   void ProcessFileQueue(std::shared_ptr<SubStreamWindowProperties> props);
 
   int AudioDeviceInit();
@@ -418,6 +437,9 @@ class Render {
   bool keyboard_capturer_is_started_ = false;
   bool foucs_on_main_window_ = false;
   bool foucs_on_stream_window_ = false;
+  bool main_window_minimized_ = false;
+  uint32_t last_main_minimize_request_tick_ = 0;
+  uint32_t last_stream_minimize_request_tick_ = 0;
   bool audio_capture_ = false;
   int main_window_width_real_ = 720;
   int main_window_height_real_ = 540;
@@ -467,7 +489,7 @@ class Render {
   bool just_created_ = false;
   std::string controlled_remote_id_ = "";
   std::string focused_remote_id_ = "";
-  bool need_to_send_host_info_ = false;
+  std::string remote_client_id_ = "";
   SDL_Event last_mouse_event;
   SDL_AudioStream* output_stream_;
   uint32_t STREAM_REFRESH_EVENT = 0;
@@ -504,14 +526,14 @@ class Render {
   bool need_to_destroy_server_window_ = false;
   bool server_window_created_ = false;
   bool server_window_inited_ = false;
-  int server_window_width_default_ = 300;
+  int server_window_width_default_ = 250;
-  int server_window_height_default_ = 450;
+  int server_window_height_default_ = 150;
-  float server_window_width_ = 300;
+  float server_window_width_ = 250;
-  float server_window_height_ = 450;
+  float server_window_height_ = 150;
-  float server_window_title_bar_height_ = 50.0f;
+  float server_window_title_bar_height_ = 30.0f;
   SDL_PixelFormat server_pixformat_ = SDL_PIXELFORMAT_NV12;
-  int server_window_normal_width_ = 300;
+  int server_window_normal_width_ = 250;
-  int server_window_normal_height_ = 450;
+  int server_window_normal_height_ = 150;
   float server_window_dpi_scaling_w_ = 1.0f;
   float server_window_dpi_scaling_h_ = 1.0f;
 
@@ -573,6 +595,10 @@ class Render {
   std::unordered_map<uint32_t, std::weak_ptr<SubStreamWindowProperties>>
       file_id_to_props_;
   std::shared_mutex file_id_to_props_mutex_;
+
+  // Map file_id to FileTransferState for global file transfer (props == null)
+  std::unordered_map<uint32_t, FileTransferState*> file_id_to_transfer_state_;
+  std::shared_mutex file_id_to_transfer_state_mutex_;
   SDL_AudioDeviceID input_dev_;
   SDL_AudioDeviceID output_dev_;
   ScreenCapturerFactory* screen_capturer_factory_ = nullptr;
@@ -586,8 +612,8 @@ class Render {
   uint64_t last_frame_time_;
   bool show_new_version_icon_ = false;
   bool show_new_version_icon_in_menu_ = true;
-  uint64_t new_version_icon_last_trigger_time_ = 0;
+  double new_version_icon_last_trigger_time_ = 0.0;
-  uint64_t new_version_icon_render_start_time_ = 0;
+  double new_version_icon_render_start_time_ = 0.0;
 #ifdef __APPLE__
   bool show_request_permission_window_ = true;
 #endif
@@ -647,6 +673,10 @@ class Render {
 
   /* ------ server mode ------ */
   std::unordered_map<std::string, ConnectionStatus> connection_status_;
+  std::unordered_map<std::string, std::string> connection_host_names_;
+  std::string selected_server_remote_id_ = "";
+  std::string selected_server_remote_hostname_ = "";
+  FileTransferState file_transfer_;
 };
 }  // namespace crossdesk
 #endif

src/gui/render_callback.cpp

@@ -4,6 +4,7 @@
 #include <cstring>
 #include <filesystem>
 #include <fstream>
+#include <limits>
 #include <unordered_map>
 
 #include "clipboard.h"
@@ -237,31 +238,31 @@ void Render::OnReceiveVideoBufferCb(const XVideoFrame* video_frame,
       render->client_properties_.find(remote_id)->second.get();
 
   if (props->connection_established_) {
-    if (!props->dst_buffer_) {
+    {
-      props->dst_buffer_capacity_ = video_frame->size;
+      std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
-      props->dst_buffer_ = new unsigned char[video_frame->size];
-    }
 
-    if (props->dst_buffer_capacity_ < video_frame->size) {
+      if (!props->back_frame_) {
-      delete props->dst_buffer_;
+        props->back_frame_ =
-      props->dst_buffer_capacity_ = video_frame->size;
+            std::make_shared<std::vector<unsigned char>>(video_frame->size);
-      props->dst_buffer_ = new unsigned char[video_frame->size];
+      }
-    }
+      if (props->back_frame_->size() != video_frame->size) {
+        props->back_frame_->resize(video_frame->size);
+      }
 
-    memcpy(props->dst_buffer_, video_frame->data, video_frame->size);
+      std::memcpy(props->back_frame_->data(), video_frame->data,
-    bool need_to_update_render_rect = false;
+                  video_frame->size);
-    if (props->video_width_ != props->video_width_last_ ||
-        props->video_height_ != props->video_height_last_) {
-      need_to_update_render_rect = true;
-      props->video_width_last_ = props->video_width_;
-      props->video_height_last_ = props->video_height_;
-    }
-    props->video_width_ = video_frame->width;
-    props->video_height_ = video_frame->height;
-    props->video_size_ = video_frame->size;
 
-    if (need_to_update_render_rect) {
+      const bool size_changed = (props->video_width_ != video_frame->width) ||
-      render->UpdateRenderRect();
+                                (props->video_height_ != video_frame->height);
+      if (size_changed) {
+        props->render_rect_dirty_ = true;
+      }
+
+      props->video_width_ = video_frame->width;
+      props->video_height_ = video_frame->height;
+      props->video_size_ = video_frame->size;
+
+      props->front_frame_.swap(props->back_frame_);
     }
 
     SDL_Event event;
@@ -320,7 +321,20 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
     std::string remote_user_id = std::string(user_id, user_id_size);
 
     static FileReceiver receiver;
-    receiver.SetOnSendAck([render](const FileTransferAck& ack) -> int {
+    receiver.SetOnSendAck([render,
+                           remote_user_id](const FileTransferAck& ack) -> int {
+      bool is_server_sending = remote_user_id.rfind("C-", 0) != 0;
+      if (is_server_sending) {
+        auto props =
+            render->GetSubStreamWindowPropertiesByRemoteId(remote_user_id);
+        if (props) {
+          PeerPtr* peer = props->peer_;
+          return SendReliableDataFrame(
+              peer, reinterpret_cast<const char*>(&ack),
+              sizeof(FileTransferAck), render->file_feedback_label_.c_str());
+        }
+      }
+
       return SendReliableDataFrame(
           render->peer_, reinterpret_cast<const char*>(&ack),
           sizeof(FileTransferAck), render->file_feedback_label_.c_str());
@@ -361,42 +375,100 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
       }
     }
 
+    Render::FileTransferState* state = nullptr;
     if (!props) {
-      LOG_WARN("FileTransferAck: no props found for file_id={}", ack.file_id);
+      {
-      return;
+        std::shared_lock lock(render->file_id_to_transfer_state_mutex_);
+        auto it = render->file_id_to_transfer_state_.find(ack.file_id);
+        if (it != render->file_id_to_transfer_state_.end()) {
+          state = it->second;
+        }
+      }
+
+      if (!state) {
+        LOG_WARN("FileTransferAck: no props/state found for file_id={}",
+                 ack.file_id);
+        return;
+      }
+    } else {
+      state = &props->file_transfer_;
     }
 
     // Update progress based on ACK
-    props->file_sent_bytes_ = ack.acked_offset;
+    state->file_sent_bytes_ = ack.acked_offset;
-    props->file_total_bytes_ = ack.total_size;
+    state->file_total_bytes_ = ack.total_size;
 
     uint32_t rate_bps = 0;
     {
-      uint32_t data_channel_bitrate =
+      if (props) {
-          props->net_traffic_stats_.data_outbound_stats.bitrate;
+        uint32_t data_channel_bitrate =
+            props->net_traffic_stats_.data_outbound_stats.bitrate;
 
-      if (data_channel_bitrate > 0 && props->file_sending_.load()) {
+        if (data_channel_bitrate > 0 && state->file_sending_.load()) {
-        rate_bps = static_cast<uint32_t>(data_channel_bitrate * 0.99f);
+          rate_bps = static_cast<uint32_t>(data_channel_bitrate * 0.99f);
 
-        uint32_t current_rate = props->file_send_rate_bps_.load();
+          uint32_t current_rate = state->file_send_rate_bps_.load();
-        if (current_rate > 0) {
+          if (current_rate > 0) {
-          // 70% old + 30% new for smoother display
+            // 70% old + 30% new for smoother display
-          rate_bps = static_cast<uint32_t>(current_rate * 0.7 + rate_bps * 0.3);
+            rate_bps =
+                static_cast<uint32_t>(current_rate * 0.7 + rate_bps * 0.3);
+          }
+        } else {
+          rate_bps = state->file_send_rate_bps_.load();
         }
       } else {
-        rate_bps = props->file_send_rate_bps_.load();
+        // Global transfer: no per-connection bitrate available.
+        // Estimate send rate from ACKed bytes delta over time.
+        const uint32_t current_rate = state->file_send_rate_bps_.load();
+        uint32_t estimated_rate_bps = 0;
+        const auto now = std::chrono::steady_clock::now();
+
+        uint64_t last_bytes = 0;
+        std::chrono::steady_clock::time_point last_time;
+        {
+          std::lock_guard<std::mutex> lock(state->file_transfer_mutex_);
+          last_bytes = state->file_send_last_bytes_;
+          last_time = state->file_send_last_update_time_;
+        }
+
+        if (state->file_sending_.load() && ack.acked_offset >= last_bytes) {
+          const uint64_t delta_bytes = ack.acked_offset - last_bytes;
+          const double delta_seconds =
+              std::chrono::duration<double>(now - last_time).count();
+
+          if (delta_seconds > 0.0 && delta_bytes > 0) {
+            const double bps =
+                (static_cast<double>(delta_bytes) * 8.0) / delta_seconds;
+            if (bps > 0.0) {
+              const double capped = (std::min)(
+                  bps,
+                  static_cast<double>((std::numeric_limits<uint32_t>::max)()));
+              estimated_rate_bps = static_cast<uint32_t>(capped);
+            }
+          }
+        }
+
+        if (estimated_rate_bps > 0 && current_rate > 0) {
+          // 70% old + 30% new for smoother display
+          rate_bps = static_cast<uint32_t>(current_rate * 0.7 +
+                                           estimated_rate_bps * 0.3);
+        } else if (estimated_rate_bps > 0) {
+          rate_bps = estimated_rate_bps;
+        } else {
+          rate_bps = current_rate;
+        }
       }
 
-      props->file_send_rate_bps_ = rate_bps;
+      state->file_send_rate_bps_ = rate_bps;
-      props->file_send_last_bytes_ = ack.acked_offset;
+      state->file_send_last_bytes_ = ack.acked_offset;
       auto now = std::chrono::steady_clock::now();
-      props->file_send_last_update_time_ = now;
+      state->file_send_last_update_time_ = now;
     }
 
     // Update file transfer list: update progress and rate
     {
-      std::lock_guard<std::mutex> lock(props->file_transfer_list_mutex_);
+      std::lock_guard<std::mutex> lock(state->file_transfer_list_mutex_);
-      for (auto& info : props->file_transfer_list_) {
+      for (auto& info : state->file_transfer_list_) {
         if (info.file_id == ack.file_id) {
           info.sent_bytes = ack.acked_offset;
           info.file_size = ack.total_size;
@@ -410,8 +482,8 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
     if ((ack.flags & 0x01) != 0) {
       // Transfer completed - receiver has finished receiving the file
       // Reopen window if it was closed by user
-      props->file_transfer_window_visible_ = true;
+      state->file_transfer_window_visible_ = true;
-      props->file_sending_ = false;  // Mark sending as finished
+      state->file_sending_ = false;  // Mark sending as finished
       LOG_INFO(
           "File transfer completed via ACK, file_id={}, total_size={}, "
           "acked_offset={}",
@@ -419,11 +491,11 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
 
       // Update file transfer list: mark as completed
       {
-        std::lock_guard<std::mutex> lock(props->file_transfer_list_mutex_);
+        std::lock_guard<std::mutex> lock(state->file_transfer_list_mutex_);
-        for (auto& info : props->file_transfer_list_) {
+        for (auto& info : state->file_transfer_list_) {
           if (info.file_id == ack.file_id) {
             info.status =
-                SubStreamWindowProperties::FileTransferStatus::Completed;
+                Render::FileTransferState::FileTransferStatus::Completed;
             info.sent_bytes = ack.total_size;
             break;
           }
@@ -432,9 +504,15 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
 
       // Unregister file_id mapping after completion
       {
-        std::lock_guard<std::shared_mutex> lock(
+        if (props) {
-            render->file_id_to_props_mutex_);
+          std::lock_guard<std::shared_mutex> lock(
-        render->file_id_to_props_.erase(ack.file_id);
+              render->file_id_to_props_mutex_);
+          render->file_id_to_props_.erase(ack.file_id);
+        } else {
+          std::lock_guard<std::shared_mutex> lock(
+              render->file_id_to_transfer_state_mutex_);
+          render->file_id_to_transfer_state_.erase(ack.file_id);
+        }
       }
 
       // Process next file in queue
@@ -456,24 +534,39 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
 
   std::string remote_id(user_id, user_id_size);
   // std::shared_lock lock(render->client_properties_mutex_);
-  if (render->client_properties_.find(remote_id) !=
+  if (remote_action.type == ControlType::host_infomation) {
-      render->client_properties_.end()) {
+    if (render->client_properties_.find(remote_id) !=
-    // local
+        render->client_properties_.end()) {
-    auto props = render->client_properties_.find(remote_id)->second;
+      // client mode
-    if (remote_action.type == ControlType::host_infomation &&
+      auto props = render->client_properties_.find(remote_id)->second;
-        props->remote_host_name_.empty()) {
+      if (props && props->remote_host_name_.empty()) {
-      props->remote_host_name_ = std::string(remote_action.i.host_name,
+        props->remote_host_name_ = std::string(remote_action.i.host_name,
-                                             remote_action.i.host_name_size);
+                                               remote_action.i.host_name_size);
-      LOG_INFO("Remote hostname: [{}]", props->remote_host_name_);
+        LOG_INFO("Remote hostname: [{}]", props->remote_host_name_);
+
+        for (int i = 0; i < remote_action.i.display_num; i++) {
+          props->display_info_list_.push_back(
+              DisplayInfo(remote_action.i.display_list[i],
+                          remote_action.i.left[i], remote_action.i.top[i],
+                          remote_action.i.right[i], remote_action.i.bottom[i]));
+        }
+      }
+      FreeRemoteAction(remote_action);
+    } else {
+      // server mode
+      render->connection_host_names_[remote_id] = std::string(
+          remote_action.i.host_name, remote_action.i.host_name_size);
+      LOG_INFO("Remote hostname: [{}]",
+               render->connection_host_names_[remote_id]);
 
       for (int i = 0; i < remote_action.i.display_num; i++) {
-        props->display_info_list_.push_back(
+        render->display_info_list_.push_back(
             DisplayInfo(remote_action.i.display_list[i],
                         remote_action.i.left[i], remote_action.i.top[i],
                         remote_action.i.right[i], remote_action.i.bottom[i]));
       }
+      FreeRemoteAction(remote_action);
     }
-    FreeRemoteAction(remote_action);
   } else {
     // remote
     if (remote_action.type == ControlType::mouse && render->mouse_controller_) {
@@ -520,6 +613,10 @@ void Render::OnSignalStatusCb(SignalStatus status, const char* user_id,
       render->signal_connected_ = false;
     } else if (SignalStatus::SignalServerClosed == status) {
       render->signal_connected_ = false;
+    } else if (SignalStatus::SignalFingerprintMismatch == status) {
+      render->signal_connected_ = false;
+      LOG_ERROR("[{}] signal server fingerprint mismatch", client_id);
+      render->config_center_->ClearDefaultCertFingerprint();
     }
   } else {
     if (client_id.rfind("C-", 0) != 0) {
@@ -547,6 +644,9 @@ void Render::OnSignalStatusCb(SignalStatus status, const char* user_id,
       props->signal_connected_ = false;
     } else if (SignalStatus::SignalServerClosed == status) {
       props->signal_connected_ = false;
+    } else if (SignalStatus::SignalFingerprintMismatch == status) {
+      props->signal_connected_ = false;
+      LOG_ERROR("[{}] signal server fingerprint mismatch", remote_id);
     }
   }
 }
@@ -568,7 +668,49 @@ void Render::OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
 
     switch (status) {
       case ConnectionStatus::Connected: {
-        render->need_to_send_host_info_ = true;
+        {
+          RemoteAction remote_action;
+          remote_action.i.display_num = render->display_info_list_.size();
+          remote_action.i.display_list =
+              (char**)malloc(remote_action.i.display_num * sizeof(char*));
+          remote_action.i.left =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          remote_action.i.top =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          remote_action.i.right =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          remote_action.i.bottom =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          for (int i = 0; i < remote_action.i.display_num; i++) {
+            LOG_INFO("Local display [{}:{}]", i + 1,
+                     render->display_info_list_[i].name);
+            remote_action.i.display_list[i] =
+                (char*)malloc(render->display_info_list_[i].name.length() + 1);
+            strncpy(remote_action.i.display_list[i],
+                    render->display_info_list_[i].name.c_str(),
+                    render->display_info_list_[i].name.length());
+            remote_action.i
+                .display_list[i][render->display_info_list_[i].name.length()] =
+                '\0';
+            remote_action.i.left[i] = render->display_info_list_[i].left;
+            remote_action.i.top[i] = render->display_info_list_[i].top;
+            remote_action.i.right[i] = render->display_info_list_[i].right;
+            remote_action.i.bottom[i] = render->display_info_list_[i].bottom;
+          }
+
+          std::string host_name = GetHostName();
+          remote_action.type = ControlType::host_infomation;
+          memcpy(&remote_action.i.host_name, host_name.data(),
+                 host_name.size());
+          remote_action.i.host_name[host_name.size()] = '\0';
+          remote_action.i.host_name_size = host_name.size();
+
+          std::string msg = remote_action.to_json();
+          int ret = SendReliableDataFrame(props->peer_, msg.data(), msg.size(),
+                                          render->control_data_label_.c_str());
+          FreeRemoteAction(remote_action);
+        }
+
         if (!render->need_to_create_stream_window_ &&
             !render->client_properties_.empty()) {
           render->need_to_create_stream_window_ = true;
@@ -585,12 +727,22 @@ void Render::OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
       case ConnectionStatus::Closed: {
         props->connection_established_ = false;
         props->mouse_control_button_pressed_ = false;
-        if (props->dst_buffer_ && props->stream_texture_) {
+
-          memset(props->dst_buffer_, 0, props->dst_buffer_capacity_);
+        {
-          SDL_UpdateTexture(props->stream_texture_, NULL, props->dst_buffer_,
+          std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
-                            props->texture_width_);
+          props->front_frame_.reset();
+          props->back_frame_.reset();
+          props->video_width_ = 0;
+          props->video_height_ = 0;
+          props->video_size_ = 0;
+          props->render_rect_dirty_ = true;
+          props->stream_cleanup_pending_ = true;
         }
-        render->CleanSubStreamWindowProperties(props);
+
+        SDL_Event event;
+        event.type = render->STREAM_REFRESH_EVENT;
+        event.user.data1 = props.get();
+        SDL_PushEvent(&event);
 
         break;
       }
@@ -623,11 +775,54 @@ void Render::OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
 
     switch (status) {
       case ConnectionStatus::Connected: {
+        {
+          RemoteAction remote_action;
+          remote_action.i.display_num = render->display_info_list_.size();
+          remote_action.i.display_list =
+              (char**)malloc(remote_action.i.display_num * sizeof(char*));
+          remote_action.i.left =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          remote_action.i.top =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          remote_action.i.right =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          remote_action.i.bottom =
+              (int*)malloc(remote_action.i.display_num * sizeof(int));
+          for (int i = 0; i < remote_action.i.display_num; i++) {
+            LOG_INFO("Local display [{}:{}]", i + 1,
+                     render->display_info_list_[i].name);
+            remote_action.i.display_list[i] =
+                (char*)malloc(render->display_info_list_[i].name.length() + 1);
+            strncpy(remote_action.i.display_list[i],
+                    render->display_info_list_[i].name.c_str(),
+                    render->display_info_list_[i].name.length());
+            remote_action.i
+                .display_list[i][render->display_info_list_[i].name.length()] =
+                '\0';
+            remote_action.i.left[i] = render->display_info_list_[i].left;
+            remote_action.i.top[i] = render->display_info_list_[i].top;
+            remote_action.i.right[i] = render->display_info_list_[i].right;
+            remote_action.i.bottom[i] = render->display_info_list_[i].bottom;
+          }
+
+          std::string host_name = GetHostName();
+          remote_action.type = ControlType::host_infomation;
+          memcpy(&remote_action.i.host_name, host_name.data(),
+                 host_name.size());
+          remote_action.i.host_name[host_name.size()] = '\0';
+          remote_action.i.host_name_size = host_name.size();
+
+          std::string msg = remote_action.to_json();
+          int ret = SendReliableDataFrame(render->peer_, msg.data(), msg.size(),
+                                          render->control_data_label_.c_str());
+          FreeRemoteAction(remote_action);
+        }
+
         render->need_to_create_server_window_ = true;
-        render->need_to_send_host_info_ = true;
         render->is_server_mode_ = true;
         render->start_screen_capturer_ = true;
         render->start_speaker_capturer_ = true;
+        render->remote_client_id_ = remote_id;
 #ifdef CROSSDESK_DEBUG
         render->start_mouse_controller_ = false;
         render->start_keyboard_capturer_ = false;
@@ -656,7 +851,7 @@ void Render::OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
           render->start_speaker_capturer_ = false;
           render->start_mouse_controller_ = false;
           render->start_keyboard_capturer_ = false;
-          render->need_to_send_host_info_ = false;
+          render->remote_client_id_ = "";
           if (props) props->connection_established_ = false;
           if (render->audio_capture_) {
             render->StopSpeakerCapturer();
@@ -681,11 +876,11 @@ void Render::OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
   }
 }
 
-void Render::NetStatusReport(const char* client_id, size_t client_id_size,
+void Render::OnNetStatusReport(const char* client_id, size_t client_id_size,
-                             TraversalMode mode,
+                               TraversalMode mode,
-                             const XNetTrafficStats* net_traffic_stats,
+                               const XNetTrafficStats* net_traffic_stats,
-                             const char* user_id, const size_t user_id_size,
+                               const char* user_id, const size_t user_id_size,
-                             void* user_data) {
+                               void* user_data) {
   Render* render = (Render*)user_data;
   if (!render) {
     return;

src/gui/toolbars/control_bar.cpp

@@ -15,18 +15,6 @@
 
 namespace crossdesk {
 
-std::string OpenFileDialog(std::string title) {
-  const char* path = tinyfd_openFileDialog(title.c_str(),
-                                           "",       // default path
-                                           0,        // number of filters
-                                           nullptr,  // filters
-                                           nullptr,  // filter description
-                                           0         // no multiple selection
-  );
-
-  return path ? path : "";
-}
-
 int CountDigits(int number) {
   if (number == 0) return 1;
   return (int)std::floor(std::log10(std::abs(number))) + 1;
@@ -53,13 +41,29 @@ int LossRateDisplay(float loss_rate) {
   return 0;
 }
 
+std::string Render::OpenFileDialog(std::string title) {
+  const char* path = tinyfd_openFileDialog(title.c_str(),
+                                           "",       // default path
+                                           0,        // number of filters
+                                           nullptr,  // filters
+                                           nullptr,  // filter description
+                                           0         // no multiple selection
+  );
+
+  return path ? path : "";
+}
+
 void Render::ProcessSelectedFile(
-    const std::string& path, std::shared_ptr<SubStreamWindowProperties>& props,
+    const std::string& path,
-    const std::string& file_label) {
+    const std::shared_ptr<SubStreamWindowProperties>& props,
+    const std::string& file_label, const std::string& remote_id) {
   if (path.empty()) {
     return;
   }
 
+  FileTransferState* file_transfer_state =
+      props ? &props->file_transfer_ : &file_transfer_;
+
   LOG_INFO("Selected file: {}", path.c_str());
 
   std::filesystem::path file_path = std::filesystem::u8path(path);
@@ -74,47 +78,51 @@ void Render::ProcessSelectedFile(
 
   // Add file to transfer list
   {
-    std::lock_guard<std::mutex> lock(props->file_transfer_list_mutex_);
+    std::lock_guard<std::mutex> lock(
-    SubStreamWindowProperties::FileTransferInfo info;
+        file_transfer_state->file_transfer_list_mutex_);
+    FileTransferState::FileTransferInfo info;
     info.file_name = file_path.filename().u8string();
     info.file_path = file_path;  // Store full path for precise matching
     info.file_size = file_size;
-    info.status = SubStreamWindowProperties::FileTransferStatus::Queued;
+    info.status = FileTransferState::FileTransferStatus::Queued;
     info.sent_bytes = 0;
     info.file_id = 0;
     info.rate_bps = 0;
-    props->file_transfer_list_.push_back(info);
+    file_transfer_state->file_transfer_list_.push_back(info);
   }
-  props->file_transfer_window_visible_ = true;
+  file_transfer_state->file_transfer_window_visible_ = true;
 
-  if (props->file_sending_.load()) {
+  if (file_transfer_state->file_sending_.load()) {
     // Add to queue
     size_t queue_size = 0;
     {
-      std::lock_guard<std::mutex> lock(props->file_queue_mutex_);
+      std::lock_guard<std::mutex> lock(file_transfer_state->file_queue_mutex_);
-      SubStreamWindowProperties::QueuedFile queued_file;
+      FileTransferState::QueuedFile queued_file;
       queued_file.file_path = file_path;
       queued_file.file_label = file_label;
-      props->file_send_queue_.push(queued_file);
+      queued_file.remote_id = remote_id;
-      queue_size = props->file_send_queue_.size();
+      file_transfer_state->file_send_queue_.push(queued_file);
+      queue_size = file_transfer_state->file_send_queue_.size();
     }
     LOG_INFO("File added to queue: {} ({} files in queue)",
              file_path.filename().string().c_str(), queue_size);
   } else {
-    StartFileTransfer(props, file_path, file_label);
+    StartFileTransfer(props, file_path, file_label, remote_id);
 
-    if (props->file_sending_.load()) {
+    if (file_transfer_state->file_sending_.load()) {
     } else {
       // Failed to start (race condition: another file started between
       // check and call) Add to queue
       size_t queue_size = 0;
       {
-        std::lock_guard<std::mutex> lock(props->file_queue_mutex_);
+        std::lock_guard<std::mutex> lock(
-        SubStreamWindowProperties::QueuedFile queued_file;
+            file_transfer_state->file_queue_mutex_);
+        FileTransferState::QueuedFile queued_file;
         queued_file.file_path = file_path;
         queued_file.file_label = file_label;
-        props->file_send_queue_.push(queued_file);
+        queued_file.remote_id = remote_id;
-        queue_size = props->file_send_queue_.size();
+        file_transfer_state->file_send_queue_.push(queued_file);
+        queue_size = file_transfer_state->file_send_queue_.size();
       }
       LOG_INFO(
           "File added to queue after race condition: {} ({} files in "
@@ -275,7 +283,7 @@ int Render::ControlBar(std::shared_ptr<SubStreamWindowProperties>& props) {
       std::string title =
           localization::select_file[localization_language_index_];
       std::string path = OpenFileDialog(title);
-      this->ProcessSelectedFile(path, props, file_label_);
+      ProcessSelectedFile(path, props, file_label_);
     }
 
     ImGui::SameLine();

src/gui/toolbars/title_bar.cpp

@@ -3,7 +3,8 @@
 #include "rd_log.h"
 #include "render.h"
 
-#define NEW_VERSION_ICON_RENDER_TIME_INTERVAL 2000
+constexpr double kNewVersionIconBlinkIntervalSec = 2.0;
+constexpr double kNewVersionIconBlinkOnTimeSec = 1.0;
 
 namespace crossdesk {
 
@@ -15,14 +16,28 @@ int Render::TitleBar(bool main_window) {
   float title_bar_button_width = title_bar_button_width_;
   float title_bar_button_height = title_bar_button_height_;
   if (main_window) {
-    title_bar_width = io.DisplaySize.x;
+    // When the main window is minimized, Dear ImGui may report DisplaySize as
-    title_bar_height = io.DisplaySize.y * TITLE_BAR_HEIGHT;
+    // (0, 0). Do not overwrite shared title-bar metrics with zeros, otherwise
-    title_bar_height_padding = io.DisplaySize.y * (TITLE_BAR_HEIGHT + 0.01f);
+    // stream/server windows (which reuse these metrics) will lose their title
-    title_bar_button_width = io.DisplaySize.x * TITLE_BAR_BUTTON_WIDTH;
+    // bars and appear collapsed.
-    title_bar_button_height = io.DisplaySize.y * TITLE_BAR_BUTTON_HEIGHT;
+    if (io.DisplaySize.x > 0.0f && io.DisplaySize.y > 0.0f) {
-    title_bar_height_ = title_bar_height;
+      title_bar_width = io.DisplaySize.x;
-    title_bar_button_width_ = title_bar_button_width;
+      title_bar_height = io.DisplaySize.y * TITLE_BAR_HEIGHT;
-    title_bar_button_height_ = title_bar_button_height;
+      title_bar_height_padding = io.DisplaySize.y * (TITLE_BAR_HEIGHT + 0.01f);
+      title_bar_button_width = io.DisplaySize.x * TITLE_BAR_BUTTON_WIDTH;
+      title_bar_button_height = io.DisplaySize.y * TITLE_BAR_BUTTON_HEIGHT;
+
+      title_bar_height_ = title_bar_height;
+      title_bar_button_width_ = title_bar_button_width;
+      title_bar_button_height_ = title_bar_button_height;
+    } else {
+      // Keep using last known good values.
+      title_bar_width = title_bar_width_;
+      title_bar_height = title_bar_height_;
+      title_bar_height_padding = title_bar_height_;
+      title_bar_button_width = title_bar_button_width_;
+      title_bar_button_height = title_bar_button_height_;
+    }
   } else {
     title_bar_width = io.DisplaySize.x;
     title_bar_height = title_bar_button_height_;
@@ -92,13 +107,11 @@ int Render::TitleBar(bool main_window) {
 
       std::string about_str = localization::about[localization_language_index_];
       if (update_available_) {
-        auto now_time = std::chrono::duration_cast<std::chrono::milliseconds>(
+        const double now_time = ImGui::GetTime();
-                            std::chrono::steady_clock::now().time_since_epoch())
-                            .count();
 
         // every 2 seconds
         if (now_time - new_version_icon_last_trigger_time_ >=
-            NEW_VERSION_ICON_RENDER_TIME_INTERVAL) {
+            kNewVersionIconBlinkIntervalSec) {
           show_new_version_icon_ = true;
           new_version_icon_render_start_time_ = now_time;
           new_version_icon_last_trigger_time_ = now_time;
@@ -106,9 +119,9 @@ int Render::TitleBar(bool main_window) {
 
         // render for 1 second
         if (show_new_version_icon_) {
-          about_str = about_str + " " + ICON_FA_TRIANGLE_EXCLAMATION;
+          about_str = about_str + " " + ICON_FA_CIRCLE_ARROW_UP;
           if (now_time - new_version_icon_render_start_time_ >=
-              NEW_VERSION_ICON_RENDER_TIME_INTERVAL / 2) {
+              kNewVersionIconBlinkOnTimeSec) {
             show_new_version_icon_ = false;
           }
         } else {
@@ -137,13 +150,11 @@ int Render::TitleBar(bool main_window) {
     }
 
     if (update_available_ && show_new_version_icon_in_menu_) {
-      auto now_time = std::chrono::duration_cast<std::chrono::milliseconds>(
+      const double now_time = ImGui::GetTime();
-                          std::chrono::steady_clock::now().time_since_epoch())
-                          .count();
 
       // every 2 seconds
       if (now_time - new_version_icon_last_trigger_time_ >=
-          NEW_VERSION_ICON_RENDER_TIME_INTERVAL) {
+          kNewVersionIconBlinkIntervalSec) {
         show_new_version_icon_ = true;
         new_version_icon_render_start_time_ = now_time;
         new_version_icon_last_trigger_time_ = now_time;
@@ -152,14 +163,13 @@ int Render::TitleBar(bool main_window) {
       // render for 1 second
       if (show_new_version_icon_) {
         ImGui::SetWindowFontScale(0.6f);
-        ImGui::SetCursorPos(
+        ImGui::SetCursorPos(ImVec2(bar_pos_x + title_bar_button_width * 0.21f,
-            ImVec2(bar_pos_x + title_bar_button_width * 0.15f,
+                                   bar_pos_y - title_bar_button_width * 0.24f));
-                   bar_pos_y - title_bar_button_width * 0.325f));
+        ImGui::Text(ICON_FA_CIRCLE_ARROW_UP);
-        ImGui::Text(ICON_FA_TRIANGLE_EXCLAMATION);
         ImGui::SetWindowFontScale(1.0f);
 
         if (now_time - new_version_icon_render_start_time_ >=
-            NEW_VERSION_ICON_RENDER_TIME_INTERVAL / 2) {
+            kNewVersionIconBlinkOnTimeSec) {
           show_new_version_icon_ = false;
         }
       }
@@ -187,6 +197,11 @@ int Render::TitleBar(bool main_window) {
   std::string window_minimize_button = "##minimize";  // ICON_FA_MINUS;
   if (ImGui::Button(window_minimize_button.c_str(),
                     ImVec2(title_bar_button_width, title_bar_button_height))) {
+    if (main_window) {
+      last_main_minimize_request_tick_ = SDL_GetTicks();
+    } else {
+      last_stream_minimize_request_tick_ = SDL_GetTicks();
+    }
     SDL_MinimizeWindow(main_window ? main_window_ : stream_window_);
   }
   draw_list->AddLine(

src/gui/windows/file_transfer_window.cpp

@@ -30,12 +30,14 @@ int BitrateDisplay(int bitrate) {
 
 int Render::FileTransferWindow(
     std::shared_ptr<SubStreamWindowProperties>& props) {
+  FileTransferState* state = props ? &props->file_transfer_ : &file_transfer_;
+
   // Only show window if there are files in transfer list or currently
   // transferring
   std::vector<SubStreamWindowProperties::FileTransferInfo> file_list;
   {
-    std::lock_guard<std::mutex> lock(props->file_transfer_list_mutex_);
+    std::lock_guard<std::mutex> lock(state->file_transfer_list_mutex_);
-    file_list = props->file_transfer_list_;
+    file_list = state->file_transfer_list_;
   }
 
   // Sort file list: Sending first, then Completed, then Queued, then Failed
@@ -66,7 +68,7 @@ int Render::FileTransferWindow(
   // It will be reopened automatically when:
   // 1. A file transfer completes (in render_callback.cpp)
   // 2. A new file starts sending from queue (in render.cpp)
-  if (!props->file_transfer_window_visible_) {
+  if (!state->file_transfer_window_visible_) {
     return 0;
   }
 
@@ -115,7 +117,7 @@ int Render::FileTransferWindow(
 
     // Close button handling
     if (!window_opened) {
-      props->file_transfer_window_visible_ = false;
+      state->file_transfer_window_visible_ = false;
       ImGui::End();
       return 0;
     }

src/gui/windows/server_window.cpp

@@ -1,48 +1,46 @@
+#include <algorithm>
+#include <cmath>
+#include <cstdio>
+#include <string>
+#include <vector>
+
+#include "layout_relative.h"
+#include "localization.h"
 #include "rd_log.h"
 #include "render.h"
 
 namespace crossdesk {
 
 namespace {
-constexpr float kDragThresholdPx = 3.0f;
+int CountDigits(int number) {
+  if (number == 0) return 1;
+  return (int)std::floor(std::log10(std::abs(number))) + 1;
+}
 
-// Handles dragging for the *last submitted ImGui item*.
+void BitrateDisplay(uint32_t bitrate) {
-// `reset_on_deactivate` should be false when the caller needs to know whether a
+  const int num_of_digits = CountDigits(static_cast<int>(bitrate));
-// deactivation was a click (no drag) vs a drag-release (dragging==true).
+  if (num_of_digits <= 3) {
-inline void HandleWindowDragForLastItem(SDL_Window* window, bool& dragging,
+    ImGui::Text("%u bps", bitrate);
-                                        float& start_mouse_x,
+  } else if (num_of_digits > 3 && num_of_digits <= 6) {
-                                        float& start_mouse_y, int& start_win_x,
+    ImGui::Text("%u kbps", bitrate / 1000);
-                                        int& start_win_y,
+  } else {
-                                        bool reset_on_deactivate = true) {
+    ImGui::Text("%.1f mbps", bitrate / 1000000.0f);
-  if (!window) {
-    return;
   }
+}
 
-  if (ImGui::IsItemActivated()) {
+std::string FormatBytes(uint64_t bytes) {
-    SDL_GetGlobalMouseState(&start_mouse_x, &start_mouse_y);
+  char buf[64];
-    SDL_GetWindowPosition(window, &start_win_x, &start_win_y);
+  if (bytes < 1024ULL) {
-    dragging = false;
+    std::snprintf(buf, sizeof(buf), "%llu B", (unsigned long long)bytes);
-  }
+  } else if (bytes < 1024ULL * 1024ULL) {
-
+    std::snprintf(buf, sizeof(buf), "%.2f KB", bytes / 1024.0);
-  if (ImGui::IsItemActive()) {
+  } else if (bytes < 1024ULL * 1024ULL * 1024ULL) {
-    if (!dragging &&
+    std::snprintf(buf, sizeof(buf), "%.2f MB", bytes / (1024.0 * 1024.0));
-        ImGui::IsMouseDragging(ImGuiMouseButton_Left, kDragThresholdPx)) {
+  } else {
-      dragging = true;
+    std::snprintf(buf, sizeof(buf), "%.2f GB",
-    }
+                  bytes / (1024.0 * 1024.0 * 1024.0));
-
-    if (dragging) {
-      float mouse_x = 0.0f;
-      float mouse_y = 0.0f;
-      SDL_GetGlobalMouseState(&mouse_x, &mouse_y);
-      const int dx = (int)(mouse_x - start_mouse_x);
-      const int dy = (int)(mouse_y - start_mouse_y);
-      SDL_SetWindowPosition(window, start_win_x + dx, start_win_y + dy);
-    }
-  }
-
-  if (reset_on_deactivate && ImGui::IsItemDeactivated()) {
-    dragging = false;
   }
+  return std::string(buf);
 }
 }  // namespace
 
@@ -57,43 +55,7 @@ int Render::ServerWindow() {
                    ImGuiWindowFlags_NoScrollbar |
                    ImGuiWindowFlags_NoScrollWithMouse);
 
-  // Collapsed mode: no buttons; drag to move; click to restore.
+  server_window_title_bar_height_ = title_bar_height_;
-  if (server_window_collapsed_) {
-    ImGui::SetCursorPos(ImVec2(0.0f, 0.0f));
-    ImGui::InvisibleButton("##server_collapsed_area",
-                           ImVec2(server_window_width_, server_window_height_));
-
-    HandleWindowDragForLastItem(server_window_,
-                                server_window_collapsed_dragging_,
-                                server_window_collapsed_drag_start_mouse_x_,
-                                server_window_collapsed_drag_start_mouse_y_,
-                                server_window_collapsed_drag_start_win_x_,
-                                server_window_collapsed_drag_start_win_y_,
-                                /*reset_on_deactivate=*/false);
-
-    const bool request_restore =
-        ImGui::IsItemDeactivated() && !server_window_collapsed_dragging_;
-    if (ImGui::IsItemDeactivated()) {
-      server_window_collapsed_dragging_ = false;
-    }
-
-    if (request_restore && server_window_) {
-      int w = 0;
-      int x = 0;
-      int y = 0;
-      int h = 0;
-      SDL_GetWindowSize(server_window_, &w, &h);
-      SDL_GetWindowPosition(server_window_, &x, &y);
-
-      const int normal_h = server_window_normal_height_;
-      SDL_SetWindowSize(server_window_, w, normal_h);
-      SDL_SetWindowPosition(server_window_, x, y);
-      server_window_collapsed_ = false;
-    }
-
-    ImGui::End();
-    return 0;
-  }
 
   ImGui::PushStyleColor(ImGuiCol_ChildBg, ImVec4(1.0f, 1.0f, 1.0f, 1.0f));
   ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0, 0));
@@ -105,97 +67,302 @@ int Render::ServerWindow() {
       ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoMove |
           ImGuiWindowFlags_NoBringToFrontOnFocus);
 
-  ImDrawList* draw_list = ImGui::GetWindowDrawList();
-
   float server_title_bar_button_width = server_window_title_bar_height_;
   float server_title_bar_button_height = server_window_title_bar_height_;
 
-  // Drag area: the title bar excluding the right-side buttons.
+  // Collapse/expand toggle button (FontAwesome icon).
   {
-    const float drag_w =
-        server_window_width_ - server_title_bar_button_width * 2;
-    const float drag_h = server_title_bar_button_height;
     ImGui::SetCursorPos(ImVec2(0.0f, 0.0f));
-    ImGui::InvisibleButton("##server_title_drag_area", ImVec2(drag_w, drag_h));
 
-    HandleWindowDragForLastItem(
+    ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(0, 0, 0, 0));
-        server_window_, server_window_dragging_,
+    ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImVec4(0, 0, 0, 0.1f));
-        server_window_drag_start_mouse_x_, server_window_drag_start_mouse_y_,
+    ImGui::PushStyleColor(ImGuiCol_ButtonActive,
-        server_window_drag_start_win_x_, server_window_drag_start_win_y_);
+                          ImVec4(1.0f, 1.0f, 1.0f, 1.0f));
-  }
 
-  float minimize_button_pos_x =
+    ImGui::SetWindowFontScale(0.5f);
-      server_window_width_ - server_title_bar_button_width * 2;
+    const char* icon =
-  ImGui::SetCursorPos(ImVec2(minimize_button_pos_x, 0.0f));
+        server_window_collapsed_ ? ICON_FA_ANGLE_DOWN : ICON_FA_ANGLE_UP;
-  ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(0, 0, 0, 0));
+    std::string toggle_label = std::string(icon) + "##server_toggle";
-  ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImVec4(0, 0, 0, 0.1f));
+    if (ImGui::Button(toggle_label.c_str(),
-  ImGui::PushStyleColor(ImGuiCol_ButtonActive, ImVec4(1.0f, 1.0f, 1.0f, 1.0f));
+                      ImVec2(server_title_bar_button_width,
+                             server_title_bar_button_height))) {
+      if (server_window_) {
+        int w = 0;
+        int h = 0;
+        int x = 0;
+        int y = 0;
+        SDL_GetWindowSize(server_window_, &w, &h);
+        SDL_GetWindowPosition(server_window_, &x, &y);
 
-  float minimize_pos_x =
+        if (server_window_collapsed_) {
-      minimize_button_pos_x + server_title_bar_button_width * 0.33f;
+          const int normal_h = server_window_normal_height_;
-  float minimize_pos_y = server_title_bar_button_height * 0.5f;
+          SDL_SetWindowSize(server_window_, w, normal_h);
-  std::string server_minimize_button = "##minimize";  // ICON_FA_MINUS;
+          SDL_SetWindowPosition(server_window_, x, y);
-  if (ImGui::Button(server_minimize_button.c_str(),
+          server_window_collapsed_ = false;
-                    ImVec2(server_title_bar_button_width,
+        } else {
-                           server_title_bar_button_height))) {
+          const int collapsed_h = (int)server_window_title_bar_height_;
-    if (server_window_) {
+          // Collapse upward: keep top edge stable.
-      int w = 0;
+          SDL_SetWindowSize(server_window_, w, collapsed_h);
-      int h = 0;
+          SDL_SetWindowPosition(server_window_, x, y);
-      int x = 0;
+          server_window_collapsed_ = true;
-      int y = 0;
+        }
-      SDL_GetWindowSize(server_window_, &w, &h);
+      }
-      SDL_GetWindowPosition(server_window_, &x, &y);
-
-      const int collapsed_h = (int)server_window_title_bar_height_;
-      // Collapse upward: keep top edge stable.
-      SDL_SetWindowSize(server_window_, w, collapsed_h);
-      SDL_SetWindowPosition(server_window_, x, y);
-      server_window_collapsed_ = true;
     }
+    ImGui::SetWindowFontScale(1.0f);
+
+    ImGui::PopStyleColor(3);
   }
-  draw_list->AddLine(
-      ImVec2(minimize_pos_x, minimize_pos_y),
-      ImVec2(minimize_pos_x + server_title_bar_button_width * 0.33f,
-             minimize_pos_y),
-      IM_COL32(0, 0, 0, 255));
-  ImGui::PopStyleColor(3);
-
-  float xmark_button_pos_x =
-      server_window_width_ - server_title_bar_button_width;
-  ImGui::SetCursorPos(ImVec2(xmark_button_pos_x, 0.0f));
-  ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(0, 0, 0, 0));
-  ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImVec4(1.0f, 0, 0, 1.0f));
-  ImGui::PushStyleColor(ImGuiCol_ButtonActive, ImVec4(1.0f, 0, 0, 0.5f));
-
-  float xmark_pos_x = xmark_button_pos_x + server_title_bar_button_width * 0.5f;
-  float xmark_pos_y = server_title_bar_button_height * 0.5f;
-  float xmark_size = server_title_bar_button_width * 0.33f;
-  std::string server_close_button = "##xmark";  // ICON_FA_XMARK;
-  if (ImGui::Button(server_close_button.c_str(),
-                    ImVec2(server_title_bar_button_width,
-                           server_title_bar_button_height))) {
-    LOG_ERROR("Close button clicked");
-    LeaveConnection(peer_, self_hosted_id_);
-  }
-
-  draw_list->AddLine(ImVec2(xmark_pos_x - xmark_size / 2 - 0.25f,
-                            xmark_pos_y - xmark_size / 2 + 0.75f),
-                     ImVec2(xmark_pos_x + xmark_size / 2 - 1.5f,
-                            xmark_pos_y + xmark_size / 2 - 0.5f),
-                     IM_COL32(0, 0, 0, 255));
-  draw_list->AddLine(
-      ImVec2(xmark_pos_x + xmark_size / 2 - 1.75f,
-             xmark_pos_y - xmark_size / 2 + 0.75f),
-      ImVec2(xmark_pos_x - xmark_size / 2, xmark_pos_y + xmark_size / 2 - 1.0f),
-      IM_COL32(0, 0, 0, 255));
-
-  ImGui::PopStyleColor(3);
 
   ImGui::EndChild();
   ImGui::PopStyleVar();
   ImGui::PopStyleColor();
 
+  RemoteClientInfoWindow();
+
   ImGui::End();
   return 0;
 }
+
+int Render::RemoteClientInfoWindow() {
+  float remote_client_info_window_width = server_window_width_ * 0.8f;
+  float remote_client_info_window_height =
+      (server_window_height_ - server_window_title_bar_height_) * 0.9f;
+
+  ImGui::PushStyleColor(ImGuiCol_ChildBg, ImVec4(1.0f, 1.0f, 1.0f, 1.0f));
+  ImGui::PushStyleVar(ImGuiStyleVar_ChildRounding, 5.0f);
+  ImGui::BeginChild(
+      "RemoteClientInfoWindow",
+      ImVec2(remote_client_info_window_width, remote_client_info_window_height),
+      ImGuiChildFlags_Border,
+      ImGuiWindowFlags_NoDecoration | ImGuiWindowFlags_NoMove |
+          ImGuiWindowFlags_NoBringToFrontOnFocus);
+  ImGui::PopStyleVar();
+  ImGui::PopStyleColor();
+
+  float font_scale = localization_language_index_ == 0 ? 0.5f : 0.45f;
+
+  std::vector<std::string> remote_hostnames;
+  remote_hostnames.reserve(connection_host_names_.size());
+  for (const auto& kv : connection_host_names_) {
+    remote_hostnames.push_back(kv.second);
+  }
+
+  auto find_remote_id_by_hostname =
+      [this](const std::string& hostname) -> std::string {
+    for (const auto& kv : connection_host_names_) {
+      if (kv.second == hostname) {
+        return kv.first;
+      }
+    }
+    return {};
+  };
+
+  if (!selected_server_remote_hostname_.empty()) {
+    if (std::find(remote_hostnames.begin(), remote_hostnames.end(),
+                  selected_server_remote_hostname_) == remote_hostnames.end()) {
+      selected_server_remote_hostname_.clear();
+      selected_server_remote_id_.clear();
+    }
+  }
+  if (selected_server_remote_hostname_.empty() && !remote_hostnames.empty()) {
+    selected_server_remote_hostname_ = remote_hostnames.front();
+    selected_server_remote_id_ =
+        find_remote_id_by_hostname(selected_server_remote_hostname_);
+  }
+
+  ImGui::SetWindowFontScale(font_scale);
+  ImGui::AlignTextToFramePadding();
+  ImGui::Text("%s",
+              localization::controller[localization_language_index_].c_str());
+  ImGui::SameLine();
+
+  const char* selected_preview = "-";
+  if (!selected_server_remote_hostname_.empty()) {
+    selected_preview = selected_server_remote_hostname_.c_str();
+  } else if (!remote_client_id_.empty()) {
+    selected_preview = remote_client_id_.c_str();
+  }
+
+  ImGui::SetNextItemWidth(remote_client_info_window_width *
+                          (localization_language_index_ == 0 ? 0.68f : 0.62f));
+  ImGui::SetWindowFontScale(localization_language_index_ == 0 ? 0.45f : 0.4f);
+  ImGui::AlignTextToFramePadding();
+  if (ImGui::BeginCombo("##server_remote_id", selected_preview)) {
+    ImGui::SetWindowFontScale(localization_language_index_ == 0 ? 0.45f : 0.4f);
+    for (int i = 0; i < static_cast<int>(remote_hostnames.size()); i++) {
+      const bool selected =
+          (remote_hostnames[i] == selected_server_remote_hostname_);
+      if (ImGui::Selectable(remote_hostnames[i].c_str(), selected)) {
+        selected_server_remote_hostname_ = remote_hostnames[i];
+        selected_server_remote_id_ =
+            find_remote_id_by_hostname(selected_server_remote_hostname_);
+      }
+      if (selected) {
+        ImGui::SetItemDefaultFocus();
+      }
+    }
+    ImGui::EndCombo();
+  }
+
+  ImGui::Separator();
+
+  ImGui::SetWindowFontScale(font_scale);
+
+  if (!selected_server_remote_id_.empty()) {
+    auto it = connection_status_.find(selected_server_remote_id_);
+    const ConnectionStatus status = (it == connection_status_.end())
+                                        ? ConnectionStatus::Closed
+                                        : it->second;
+
+    ImGui::Text(
+        "%s",
+        localization::connection_status[localization_language_index_].c_str());
+    ImGui::SameLine();
+
+    switch (status) {
+      case ConnectionStatus::Connected:
+        ImGui::Text(
+            "%s",
+            localization::p2p_connected[localization_language_index_].c_str());
+        break;
+      case ConnectionStatus::Connecting:
+        ImGui::Text(
+            "%s",
+            localization::p2p_connecting[localization_language_index_].c_str());
+        break;
+      case ConnectionStatus::Disconnected:
+        ImGui::Text("%s",
+                    localization::p2p_disconnected[localization_language_index_]
+                        .c_str());
+        break;
+      case ConnectionStatus::Failed:
+        ImGui::Text(
+            "%s",
+            localization::p2p_failed[localization_language_index_].c_str());
+        break;
+      case ConnectionStatus::Closed:
+        ImGui::Text(
+            "%s",
+            localization::p2p_closed[localization_language_index_].c_str());
+        break;
+      default:
+        ImGui::Text(
+            "%s",
+            localization::p2p_failed[localization_language_index_].c_str());
+        break;
+    }
+  }
+
+  ImGui::Separator();
+
+  ImGui::AlignTextToFramePadding();
+  ImGui::Text(
+      "%s", localization::file_transfer[localization_language_index_].c_str());
+
+  ImGui::SameLine();
+
+  if (ImGui::Button(
+          localization::select_file[localization_language_index_].c_str())) {
+    std::string title = localization::select_file[localization_language_index_];
+    std::string path = OpenFileDialog(title);
+    LOG_INFO("Selected file path: {}", path.c_str());
+
+    ProcessSelectedFile(path, nullptr, file_label_, selected_server_remote_id_);
+  }
+
+  if (file_transfer_.file_transfer_window_visible_) {
+    ImGui::SameLine();
+    const bool is_sending = file_transfer_.file_sending_.load();
+
+    if (is_sending) {
+      // Simple animation: cycle icon every 0.5s while sending.
+      static const char* kFileTransferIcons[] = {ICON_FA_ANGLE_UP,
+                                                 ICON_FA_ANGLES_UP};
+      const int icon_index = static_cast<int>(ImGui::GetTime() / 0.5) %
+                             (static_cast<int>(sizeof(kFileTransferIcons) /
+                                               sizeof(kFileTransferIcons[0])));
+      ImGui::Text("%s", kFileTransferIcons[icon_index]);
+    } else {
+      // Completed.
+      ImGui::Text("%s", ICON_FA_CHECK);
+    }
+
+    if (ImGui::IsItemHovered()) {
+      const uint64_t sent_bytes = file_transfer_.file_sent_bytes_.load();
+      const uint64_t total_bytes = file_transfer_.file_total_bytes_.load();
+      const uint32_t rate_bps = file_transfer_.file_send_rate_bps_.load();
+
+      float progress = 0.0f;
+      if (total_bytes > 0) {
+        progress =
+            static_cast<float>(sent_bytes) / static_cast<float>(total_bytes);
+        progress = (std::max)(0.0f, (std::min)(1.0f, progress));
+      }
+
+      std::string current_file_name;
+      const uint32_t current_file_id = file_transfer_.current_file_id_.load();
+      if (current_file_id != 0) {
+        std::lock_guard<std::mutex> lock(
+            file_transfer_.file_transfer_list_mutex_);
+        for (const auto& info : file_transfer_.file_transfer_list_) {
+          if (info.file_id == current_file_id) {
+            current_file_name = info.file_name;
+            break;
+          }
+        }
+      }
+
+      ImGui::BeginTooltip();
+      if (server_windows_system_chinese_font_) {
+        ImGui::PushFont(server_windows_system_chinese_font_);
+      }
+      ImGui::SetWindowFontScale(0.5f);
+      if (!current_file_name.empty()) {
+        ImGui::Text("%s", current_file_name.c_str());
+      }
+      if (total_bytes > 0) {
+        const std::string sent_str = FormatBytes(sent_bytes);
+        const std::string total_str = FormatBytes(total_bytes);
+        ImGui::Text("%s / %s", sent_str.c_str(), total_str.c_str());
+      }
+
+      const float text_height = ImGui::GetTextLineHeight();
+      char overlay[32];
+      std::snprintf(overlay, sizeof(overlay), "%.1f%%", progress * 100.0f);
+      ImGui::ProgressBar(progress, ImVec2(180.0f, text_height), overlay);
+      BitrateDisplay(rate_bps);
+      ImGui::SetWindowFontScale(1.0f);
+      if (server_windows_system_chinese_font_) {
+        ImGui::PopFont();
+      }
+      ImGui::EndTooltip();
+    }
+  }
+
+  ImGui::SetWindowFontScale(1.0f);
+
+  ImGui::EndChild();
+
+  ImGui::SameLine();
+
+  float close_connection_button_width = server_window_width_ * 0.1f;
+  float close_connection_button_height = remote_client_info_window_height;
+
+  ImGui::PushStyleColor(ImGuiCol_Button, ImVec4(1.0f, 0.0f, 0.0f, 1.0f));
+  ImGui::PushStyleColor(ImGuiCol_ButtonHovered, ImVec4(1.0f, 0.3f, 0.3f, 1.0f));
+  ImGui::PushStyleColor(ImGuiCol_ButtonActive, ImVec4(1.0f, 0.5f, 0.5f, 1.0f));
+  ImGui::PushStyleVar(ImGuiStyleVar_FrameRounding, 5.0f);
+  ImGui::SetWindowFontScale(font_scale);
+  if (ImGui::Button(ICON_FA_XMARK, ImVec2(close_connection_button_width,
+                                          close_connection_button_height))) {
+    if (peer_ && !selected_server_remote_id_.empty()) {
+      LeaveConnection(peer_, selected_server_remote_id_.c_str());
+    }
+  }
+  ImGui::SetWindowFontScale(1.0f);
+  ImGui::PopStyleColor(3);
+  ImGui::PopStyleVar();
+
+  return 0;
+}
 }  // namespace crossdesk

xmake.lua

@@ -70,6 +70,9 @@ target("common")
     set_kind("object")
     add_deps("rd_log")
     add_files("src/common/*.cpp")
+    if is_os("macosx") then
+        add_files("src/common/*.mm")
+    end
     add_includedirs("src/common", {public = true})
 
 target("path_manager")