[REGEDIT] Handle Ctrl+Backspace in AddressBar (#7140)

Notes:
- Also fixes a bug where Del does not work in the AddressBar nor during Tree/List label edit because it gets eaten by the accelerator.
- Removed the code that handles CtrlA in the AddressBar because the Edit control does this out of the box.

base/applications/regedit/childwnd.c

@@ -20,6 +20,8 @@
  */
 
 #include "regedit.h"
+#include <shldisp.h>
+#include <shlguid.h>
 
 ChildWnd* g_pChildWnd;
 static int last_split;
@@ -27,6 +29,63 @@ HBITMAP SizingPattern = 0;
 HBRUSH  SizingBrush = 0;
 WCHAR Suggestions[256];
 
+static HRESULT WINAPI DummyEnumStringsQI(LPVOID This, REFIID riid, void**ppv)
+{
+    if (ppv)
+        *ppv = NULL;
+    if (IsEqualIID(riid, &IID_IEnumString) || IsEqualIID(riid, &IID_IUnknown))
+    {
+        *ppv = This;
+        return S_OK;
+    }
+    return E_NOINTERFACE;
+}
+
+static ULONG WINAPI DummyEnumStringsAddRefRelease(LPVOID This)
+{
+    return 1;
+}
+
+static HRESULT WINAPI DummyEnumStringsNext(LPVOID This, ULONG celt, LPWSTR *parr, ULONG *pceltFetched)
+{
+    if (pceltFetched)
+        *pceltFetched = 0;
+    return S_FALSE;
+}
+
+static HRESULT WINAPI DummyEnumStringsSkip(LPVOID This, ULONG celt)
+{
+    return S_OK;
+}
+
+static HRESULT WINAPI DummyEnumStringsReset(LPVOID This)
+{
+    return S_OK;
+}
+
+static HRESULT WINAPI DummyEnumStringsClone(LPVOID This, void**ppv)
+{
+    return E_NOTIMPL;
+}
+
+struct DummyEnumStringsVtbl {
+    LPVOID QI, AddRef, Release, Next, Skip, Reset, Clone;
+} g_DummyEnumStringsVtbl = {
+    &DummyEnumStringsQI,
+    &DummyEnumStringsAddRefRelease,
+    &DummyEnumStringsAddRefRelease,
+    &DummyEnumStringsNext,
+    &DummyEnumStringsSkip,
+    &DummyEnumStringsReset,
+    &DummyEnumStringsClone
+};
+
+struct DummyEnumStrings {
+    struct DummyEnumStringsVtbl *lpVtbl;
+} g_DummyEnumStrings = {
+    &g_DummyEnumStringsVtbl
+};
+
 extern LPCWSTR get_root_key_name(HKEY hRootKey)
 {
     if (hRootKey == HKEY_CLASSES_ROOT) return L"HKEY_CLASSES_ROOT";
@@ -338,6 +397,7 @@ LRESULT CALLBACK ChildWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lPa
         HFONT hFont;
         WCHAR buffer[MAX_PATH];
         DWORD style;
+        IAutoComplete *pAutoComplete;
 
         /* Load "My Computer" string */
         LoadStringW(hInst, IDS_MY_COMPUTER, buffer, ARRAY_SIZE(buffer));
@@ -363,6 +423,12 @@ LRESULT CALLBACK ChildWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lPa
                                                     IMAGE_ICON, 12, 12, 0);
         SendMessageW(g_pChildWnd->hAddressBtnWnd, BM_SETIMAGE, IMAGE_ICON, (LPARAM)g_pChildWnd->hArrowIcon);
 
+        if (SUCCEEDED(CoCreateInstance(&CLSID_AutoComplete, NULL, CLSCTX_INPROC_SERVER, &IID_IAutoComplete, (void**)&pAutoComplete)))
+        {
+            IAutoComplete_Init(pAutoComplete, g_pChildWnd->hAddressBarWnd, (IUnknown*)&g_DummyEnumStrings, NULL, NULL);
+            IAutoComplete_Release(pAutoComplete);
+        }
+
         GetClientRect(hWnd, &rc);
         g_pChildWnd->hTreeWnd = CreateTreeView(hWnd, g_pChildWnd->szPath, (HMENU) TREE_WINDOW);
         g_pChildWnd->hListWnd = CreateListView(hWnd, (HMENU) LIST_WINDOW, rc.right - g_pChildWnd->nSplitPos);

base/applications/regedit/main.c

@@ -176,25 +176,36 @@ void ExitInstance(HINSTANCE hInstance)
     UnloadAclUiDll();
 }
 
-BOOL TranslateChildTabMessage(PMSG msg)
+static BOOL InLabelEdit(HWND hWnd, UINT Msg)
 {
-    if (msg->message != WM_KEYDOWN) return FALSE;
+    HWND hEdit = (HWND)SendMessageW(hWnd, Msg, 0, 0);
-
+    return hEdit && IsWindowVisible(hEdit);
-    /* Allow Ctrl+A on address bar */
-    if ((msg->hwnd == g_pChildWnd->hAddressBarWnd) &&
-        (msg->message == WM_KEYDOWN) &&
-        (msg->wParam == L'A') && (GetKeyState(VK_CONTROL) < 0))
-    {
-        SendMessageW(msg->hwnd, EM_SETSEL, 0, -1);
-        return TRUE;
 }
 
+static BOOL TranslateChildTabMessage(PMSG msg)
+{
+    if (msg->message != WM_KEYDOWN) return FALSE;
     if (msg->wParam != VK_TAB) return FALSE;
     if (GetParent(msg->hwnd) != g_pChildWnd->hWnd) return FALSE;
     PostMessageW(hFrameWnd, WM_COMMAND, ID_SWITCH_PANELS, 0);
     return TRUE;
 }
 
+static BOOL TranslateRegeditAccelerator(HWND hWnd, HACCEL hAccTable, PMSG msg)
+{
+    if (msg->message == WM_KEYDOWN)
+    {
+        if (msg->wParam == VK_DELETE)
+        {
+            if (g_pChildWnd->hAddressBarWnd == msg->hwnd)
+                return FALSE;
+            if (InLabelEdit(g_pChildWnd->hTreeWnd, TVM_GETEDITCONTROL) || InLabelEdit(g_pChildWnd->hListWnd, LVM_GETEDITCONTROL))
+                return FALSE;
+        }
+    }
+    return TranslateAcceleratorW(hWnd, hAccTable, msg);
+}
+
 int WINAPI wWinMain(HINSTANCE hInstance,
                       HINSTANCE hPrevInstance,
                       LPWSTR    lpCmdLine,
@@ -205,6 +216,8 @@ int WINAPI wWinMain(HINSTANCE hInstance,
 
     UNREFERENCED_PARAMETER(hPrevInstance);
 
+    OleInitialize(NULL);
+
     /* Initialize global strings */
     LoadStringW(hInstance, IDS_APP_TITLE, szTitle, ARRAY_SIZE(szTitle));
     LoadStringW(hInstance, IDC_REGEDIT_FRAME, szFrameClass, ARRAY_SIZE(szFrameClass));
@@ -237,7 +250,7 @@ int WINAPI wWinMain(HINSTANCE hInstance,
     /* Main message loop */
     while (GetMessageW(&msg, NULL, 0, 0))
     {
-        if (!TranslateAcceleratorW(hFrameWnd, hAccel, &msg) &&
+        if (!TranslateRegeditAccelerator(hFrameWnd, hAccel, &msg) &&
             !TranslateChildTabMessage(&msg))
         {
             TranslateMessage(&msg);

base/applications/regedit/regedit.h

@@ -1,6 +1,7 @@
 #ifndef _REGEDIT_H
 #define _REGEDIT_H
 
+#define COBJMACROS
 #define WIN32_LEAN_AND_MEAN     /* Exclude rarely-used stuff from Windows headers */
 #define WIN32_NO_STATUS
 #include <windows.h>