Created notification for taskbar layout updates

ExplorerPatcher/ExplorerPatcher.vcxproj

@@ -203,6 +203,7 @@
     <ClCompile Include="StartMenu.c" />
     <ClCompile Include="StartupSound.c" />
     <ClCompile Include="symbols.c" />
+    <ClCompile Include="TaskbarCenter.c" />
     <ClCompile Include="utility.c" />
   </ItemGroup>
   <ItemGroup>
@@ -218,6 +219,7 @@
     <ClInclude Include="StartMenu.h" />
     <ClInclude Include="StartupSound.h" />
     <ClInclude Include="symbols.h" />
+    <ClInclude Include="TaskbarCenter.h" />
     <ClInclude Include="utility.h" />
   </ItemGroup>
   <ItemGroup>

ExplorerPatcher/ExplorerPatcher.vcxproj.filters

@@ -54,6 +54,9 @@
     <ClInclude Include="fmemopen.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="TaskbarCenter.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ResourceCompile Include="ExplorerPatcher.rc">
@@ -94,6 +97,9 @@
     <ClCompile Include="fmemopen.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="TaskbarCenter.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="settings.reg" />

ExplorerPatcher/TaskbarCenter.c

@@ -0,0 +1,43 @@
+#include "TaskbarCenter.h"
+
+HANDLE hEvent;
+
+BOOL TaskbarCenter_Notify()
+{
+	if (hEvent)
+	{
+		SetEvent(hEvent);
+		return TRUE;
+	}
+	return FALSE;
+}
+
+BOOL GetClientRectHook(HWND hWnd, LPRECT lpRect)
+{
+	wchar_t wszClassName[100];
+	ZeroMemory(wszClassName, 100);
+	GetClassNameW(hWnd, wszClassName, 100);
+	if (!wcscmp(wszClassName, L"Shell_TrayWnd") || !wcscmp(wszClassName, L"Shell_SecondaryTrayWnd"))
+	{
+		TaskbarCenter_Notify();
+	}
+	return GetClientRect(hWnd, lpRect);
+}
+
+HRESULT TaskbarCenter_Initialize(HMODULE hExplorer)
+{
+	// This is one of the methods called by explorer!CTaskListWnd::_RecomputeLayout
+	if (!VnPatchDelayIAT(hExplorer, "ext-ms-win-rtcore-ntuser-window-ext-l1-1-0.dll", "GetClientRect", GetClientRectHook))
+	{
+		return E_NOTIMPL;
+	}
+	if (!(hEvent = CreateEventW(NULL, TRUE, FALSE, TASKBAR_CHANGED_NOTIFICATION)))
+	{
+		return E_NOTIMPL;
+	}
+	if (GetLastError() == ERROR_ALREADY_EXISTS)
+	{
+		return E_NOTIMPL;
+	}
+	return S_OK;
+}

ExplorerPatcher/TaskbarCenter.h

@@ -0,0 +1,10 @@
+#ifndef _H_TASKBARCENTER_H_
+#define _H_TASKBARCENTER_H_
+#include <initguid.h>
+#include <Windows.h>
+#include <valinet/hooking/iatpatch.h>
+
+#define TASKBAR_CHANGED_NOTIFICATION L"Global\\ExplorerPatcher_TaskbarChangedNotification"
+
+HRESULT TaskbarCenter_Initialize(HMODULE);
+#endif

ExplorerPatcher/dllmain.c

@@ -28,6 +28,7 @@
 #include "HideExplorerSearchBar.h"
 #include "StartMenu.h"
 #include "GUI.h"
+#include "TaskbarCenter.h"
 
 #define WINX_ADJUST_X 5
 #define WINX_ADJUST_Y 5
@@ -1549,9 +1550,21 @@ __declspec(dllexport) DWORD WINAPI main(
                 ArchiveMenuThread,
                 params,
                 0,
+                0,
                 0
             );
         }
+
+
+        // This notifies applications when the taskbar has recomputed its layout
+        if (SUCCEEDED(TaskbarCenter_Initialize(hExplorer)))
+        {
+            printf("Initialized taskbar update notification.\n");
+        }
+        else
+        {
+            printf("Failed to register taskbar update notification.\n");
+        }
     }
     else
     {