[idd] helper: send message over pipe when settings changed

idd/LGCommon/PipeMsg.h

@@ -1,4 +1,4 @@
-/**
+/**
  * Looking Glass
  * Copyright © 2017-2026 The Looking Glass Authors
  * https://looking-glass.io
@@ -31,7 +31,8 @@ struct LGPipeMsg
   {
     SETCURSORPOS,
     SETDISPLAYMODE,
-    GPUSTATUS
+    GPUSTATUS,
+    RELOADSETTINGS
   }
   type;
   union

idd/LGIddHelper/CConfigWindow.cpp

@@ -291,7 +291,9 @@ LRESULT CConfigWindow::onCommand(WORD id, WORD code, HWND hwnd)
     m_modeBox->setSel(updateModeList(index));
 
     LRESULT result = m_settings.setModes(*m_modes);
-    if (result != ERROR_SUCCESS)
+    if (result == ERROR_SUCCESS)
+      sendSettingChange();
+    else
       DEBUG_ERROR_HR((HRESULT) result, "Failed to save modes");
   }
   else if (m_modeDelete && hwnd == *m_modeDelete && code == BN_CLICKED && m_modes)
@@ -304,20 +306,27 @@ LRESULT CConfigWindow::onCommand(WORD id, WORD code, HWND hwnd)
     m_modeBox->clear();
     m_modes->erase(m_modes->begin() + index);
 
-    LRESULT result = m_settings.setModes(*m_modes);
-    if (result != ERROR_SUCCESS)
-      DEBUG_ERROR_HR((HRESULT) result, "Failed to save modes");
-
     updateModeList();
     onModeListSelectChange();
+
+    LRESULT result = m_settings.setModes(*m_modes);
+    if (result == ERROR_SUCCESS)
+      sendSettingChange();
+    else
+      DEBUG_ERROR_HR((HRESULT) result, "Failed to save modes");
   }
   else if (m_modeReset && hwnd == *m_modeReset && code == BN_CLICKED && m_modes)
   {
     *m_modes = m_settings.getDefaultModes();
-    m_settings.setModes(*m_modes);
     m_modeBox->clear();
     updateModeList();
     onModeListSelectChange();
+
+    LRESULT result = m_settings.setModes(*m_modes);
+    if (result == ERROR_SUCCESS)
+      sendSettingChange();
+    else
+      DEBUG_ERROR_HR((HRESULT)result, "Failed to save modes");
   }
   else if (m_defRefresh && hwnd == *m_defRefresh && code == EN_CHANGE && m_defaultRefresh)
   {
@@ -332,8 +341,11 @@ LRESULT CConfigWindow::onCommand(WORD id, WORD code, HWND hwnd)
     }
 
     m_defaultRefresh = value;
+
     LRESULT result = m_settings.setDefaultRefresh(value);
-    if (result != ERROR_SUCCESS)
+    if (result == ERROR_SUCCESS)
+      sendSettingChange();
+    else
       DEBUG_ERROR_HR((HRESULT)result, "Failed to default refresh");
   }
   else if (m_prefNoGPU && hwnd == *m_prefNoGPU && code == BN_CLICKED && m_noGPU)

idd/LGIddHelper/CConfigWindow.h

@@ -64,6 +64,8 @@ class CConfigWindow : public CWindow
   std::unique_ptr<CCheckbox> m_prefNoGPU;
 
   std::function<void()> m_onDestroy;
+  std::function<void()> m_onSettingChange;
+
   double m_scale;
   Microsoft::WRL::Wrappers::HandleT<FontTraits> m_font;
   CRegistrySettings m_settings;
@@ -75,6 +77,7 @@ class CConfigWindow : public CWindow
   void updateFont();
   int updateModeList(int wanted = -1);
   void onModeListSelectChange();
+  void sendSettingChange() { if (m_onSettingChange) m_onSettingChange(); }
 
   virtual LRESULT handleMessage(UINT uMsg, WPARAM wParam, LPARAM lParam) override;
   virtual LRESULT onCreate() override;
@@ -87,4 +90,5 @@ public:
   static bool registerClass();
 
   void onDestroy(std::function<void()> func) { m_onDestroy = std::move(func); }
+  void onSettingChange(std::function<void()> func) { m_onSettingChange = std::move(func); }
 };

idd/LGIddHelper/CNotifyWindow.cpp

@@ -140,6 +140,8 @@ LRESULT CNotifyWindow::onNotifyIcon(UINT uEvent, WORD wIconId, int x, int y)
       m_config->onDestroy([this]() {
         PostMessage(m_hwnd, WM_CLEAN_UP_CONFIG, 0, 0);
       });
+      if (m_onSettingChange)
+        m_config->onSettingChange(m_onSettingChange);
       ShowWindow(*m_config, SW_NORMAL);
       break;
     }

idd/LGIddHelper/CNotifyWindow.h

@@ -20,6 +20,7 @@
 
 #pragma once
 #include "CWindow.h"
+#include <functional>
 #include <memory>
 #include <optional>
 
@@ -37,6 +38,8 @@ class CNotifyWindow : public CWindow
   bool closeRequested;
   std::unique_ptr<CConfigWindow> m_config;
 
+  std::function<void()> m_onSettingChange;
+
   LRESULT onNotifyIcon(UINT uEvent, WORD wIconId, int x, int y);
   void registerIcon();
   void handleGPUNotification(bool hasGPU);
@@ -69,4 +72,6 @@ public:
 
   HWND hwndDialog();
   void close();
+
+  void onSettingChange(std::function<void()> func) { m_onSettingChange = std::move(func); }
 };

idd/LGIddHelper/CPipeClient.cpp

@@ -170,6 +170,17 @@ void CPipeClient::WriteMsg(const LGPipeMsg& msg)
   FlushFileBuffers(m_pipe.Get());
 }
 
+void CPipeClient::ReloadSettings()
+{
+  if (!m_connected)
+    return;
+
+  LGPipeMsg msg;
+  msg.size = sizeof(msg);
+  msg.type = LGPipeMsg::RELOADSETTINGS;
+  WriteMsg(msg);
+}
+
 void CPipeClient::Thread()
 {
   DEBUG_INFO("Pipe thread started");

idd/LGIddHelper/CPipeClient.h

@@ -59,6 +59,8 @@ public:
   bool Init();
   void DeInit();
   bool IsRunning() { return m_running; }
+
+  void ReloadSettings();
 };
 
 extern CPipeClient g_pipe;

idd/LGIddHelper/main.cpp

@@ -120,6 +120,10 @@ int WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _
   if (!g_pipe.Init())
     return EXIT_FAILURE;
 
+  window.onSettingChange([]() {
+    g_pipe.ReloadSettings();
+  });
+
   HANDLE hWait;
   if (!RegisterWaitForSingleObject(&hWait, hParent.Get(), DestroyNotifyWindow, &window, INFINITE, WT_EXECUTEONLYONCE))
     DEBUG_ERROR_HR(GetLastError(), "Failed to RegisterWaitForSingleObject");