add pretranslate message hook

3 files changed, 33 insertions, 1 deletions

diff --git a/alf/alf.cpp b/alf/alf.cpp
index 6f8d28a..57059d2 100644
--- a/alf/alf.cpp
+++ b/alf/alf.cpp
@@ -154,6 +154,10 @@ ALF_DefWindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
         return 0;
     }
 
+    if (msg == ALF_WM_PRETRANSLATEMSG) {
+        return (LRESULT)ALF_PreTranslateMessagePriv(hwnd, priv, (MSG *)lparam);
+    }
+
     if (msg == WM_COMMAND) {
         HWND source = (HWND)lparam;
         WORD code   = HIWORD(wparam);
@@ -453,6 +457,26 @@ ALF_ApplicationFromWindow(HWND hwnd)
     return (ALFAPP)SendMessage(hwnd, ALF_WM_GETAPPLICATION, 0, 0);
 }
 
+BOOL
+ALF_PreTranslateMessage(HWND hwnd, MSG *message)
+{
+    return (BOOL)SendMessage(hwnd, ALF_WM_PRETRANSLATEMSG, 0, (LPARAM)message);
+}
+
+BOOL
+ALF_PreTranslateMessagePriv(HWND win, ALFWindowPriv *priv, MSG *message)
+{
+    BOOL ret = FALSE;
+
+    if (priv->vtbl->pretranslatemessage)
+        ret = priv->vtbl->pretranslatemessage(priv->closure, win, message);
+
+    if (!ret)
+        ret = IsDialogMessage(win, message);
+
+    return ret;
+}
+
 int
 ALF_ShowModal(HWND win)
 {
@@ -467,7 +491,7 @@ ALF_ShowModal(HWND win)
         // TODO: call application message hooks
         // TODO: call preprocess message hook
 
-        if (!IsDialogMessage(win, &msg)) {
+        if (!ALF_PreTranslateMessage(win, &msg)) {
             TranslateMessage(&msg);
             DispatchMessage(&msg);
         }
diff --git a/alf/alf.h b/alf/alf.h
index 0c32a20..38e3b0b 100644
--- a/alf/alf.h
+++ b/alf/alf.h
@@ -22,6 +22,7 @@ typedef struct {
     LRESULT (*message)(void * /*closure*/, HWND, UINT, WPARAM, LPARAM);
     LRESULT (*command)(void * /*closure*/, HWND /*window*/, WORD /*notificationcode*/, WORD /*sourceid*/, HWND /*control*/);
     LRESULT (*notify)(void * /*closure*/, HWND /*window*/, WPARAM /*sourceid*/, NMHDR *);
+    BOOL (*pretranslatemessage)(void * /*closure*/, HWND /*window*/, MSG * /*message*/);
 } ALFWindowVTable;
 
 // layout flags
@@ -53,6 +54,7 @@ typedef struct {
 #define ALF_WM_SETLAYOUTPARAMS  (ALF_WM__BASE + 14)
 #define ALF_WM_GETWIDGETATPOS   (ALF_WM__BASE + 15)
 #define ALF_WM_APPLYFONTS       (ALF_WM__BASE + 16)
+#define ALF_WM_PRETRANSLATEMSG  (ALF_WM__BASE + 17)
 
 typedef struct {
     const TCHAR    *className;
@@ -102,6 +104,9 @@ ALF_DestroyWindow(HWND win);
 ALFAPP
 ALF_ApplicationFromWindow(HWND hwnd);
 
+BOOL
+ALF_PreTranslateMessage(HWND hwnd, MSG *message);
+
 int
 ALF_CentipointsToPixels(HWND win, int cptValue);
 
diff --git a/alf/alfpriv.h b/alf/alfpriv.h
index 775d421..61d7b39 100644
--- a/alf/alfpriv.h
+++ b/alf/alfpriv.h
@@ -44,6 +44,9 @@ ALF_UpdateFontsPriv(HWND hwnd, ALFWindowPriv *priv);
 void
 ALF_ApplyFontsPriv(HWND win, ALFWindowPriv *priv);
 
+BOOL
+ALF_PreTranslateMessagePriv(HWND win, ALFWindowPriv *priv, MSG *message);
+
 void
 ALF_RegisterComboClass(ALFAPP app);