window: add paint vfunc

2 files changed, 6 insertions, 2 deletions

diff --git a/alf/alf.h b/alf/alf.h
index a23eb8c..4102a1e 100644
--- a/alf/alf.h
+++ b/alf/alf.h
@@ -22,6 +22,7 @@ typedef struct {
     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*/);
+    void (*paint)(void * /*closure*/, HWND, HDC, RECT *);
 } ALFWindowVTable;
 
 typedef struct {
diff --git a/alf/alfwindow.cpp b/alf/alfwindow.cpp
index c3f8573..41d13e8 100644
--- a/alf/alfwindow.cpp
+++ b/alf/alfwindow.cpp
@@ -153,8 +153,11 @@ ALF_WindowProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
 static void
 ALF_Window_Paint(ALFWindowPriv *priv, HWND hwnd, HDC dc, RECT *r)
 {
-    (void)hwnd;
-    ALF_FillRect(dc, r, priv->bgcolor);
+    if (priv->vtbl && priv->vtbl->paint) {
+        priv->vtbl->paint(priv->closure, hwnd, dc, r);
+    } else {
+        ALF_FillRect(dc, r, priv->bgcolor);
+    }
 }
 
 LRESULT