concerted effort to reduce unneccessary redraws on transparent backgrounds

1 files changed, 4 insertions, 4 deletions

diff --git a/alf/alfbutton.cpp b/alf/alfbutton.cpp
index 17ff1b0..2bc6bc4 100644
--- a/alf/alfbutton.cpp
+++ b/alf/alfbutton.cpp
@@ -907,14 +907,14 @@ ALF_NtButton_WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
         ALFColor newcolor = (ALFColor)lParam;
         if (priv->bgcolor != newcolor) {
             priv->bgcolor = newcolor;
-            // FIXME! optimize classic button which is not transparent
-            InvalidateRect(hwnd, NULL, TRUE);
+            if (priv->hTheme) {
+                InvalidateRect(hwnd, NULL, TRUE);
+            }
         }
     } else if (uMsg == ALF_WM_GETBGCOLOR) {
         return (LRESULT)priv->bgcolor;
     } else if (uMsg == ALF_WM_BACKGROUNDCHANGE) {
-        if (priv->bgcolor == ALF_COLOR_TRANSPARENT) {
-            // FIXME! optimize classic button which is not transparent
+        if (priv->bgcolor == ALF_COLOR_TRANSPARENT && priv->hTheme) {
             InvalidateRect(hwnd, NULL, TRUE);
         }
     } else if (uMsg == WM_SIZE) {