fixup transparent background work and add test in widgetfactory

Win32s bites once again with its 16bit WPARAM

1 files changed, 12 insertions, 2 deletions

diff --git a/alf/alfpanel.cpp b/alf/alfpanel.cpp
index eb954ec..7e109bb 100644
--- a/alf/alfpanel.cpp
+++ b/alf/alfpanel.cpp
@@ -73,11 +73,12 @@ ALF_Panel_DefWindowProc(HWND window, UINT msg, WPARAM wparam, LPARAM lparam)
     }
 
     if (msg == ALF_WM_SETBGCOLOR) {
-        priv->bgcolor = (ALFColor)wparam;
+        priv->bgcolor = (ALFColor)lparam;
 
         InvalidateRect(window, NULL, TRUE);
 
         // fallthrough to layout, will propagate color to children
+        // and invalidate the background of transparent children
     }
 
     if (msg == WM_GETFONT) {
@@ -121,6 +122,15 @@ ALF_Panel_DefWindowProc(HWND window, UINT msg, WPARAM wparam, LPARAM lparam)
         ALF_Layout_Apply(&priv->layout, window);
     }
 
+    if (msg == ALF_WM_BACKGROUNDCHANGE) {
+        if (priv->bgcolor != ALF_COLOR_TRANSPARENT)
+            return 0; // nothing to do here, background is our own solid color
+
+        InvalidateRect(window, NULL, TRUE);
+
+        // fallthrough to layout, will propagate to transparent children
+    }
+
     LRESULT ret = 0;
     if (ALF_Layout_HandleMessage(&priv->layout, window, msg, wparam, lparam, &ret))
         return ret;
@@ -200,7 +210,7 @@ ALF_AddPanel(HWND parent, WORD id, int x, int y)
 {
     HWND hwndPanel = ALF_CreatePanelWindow(parent, id);
 
-    ALF_AddWidget(parent, x, y, hwndPanel, 0, 0, ALF_LAYOUT_SIZE_QUERY | ALF_LAYOUT_INHERITFONT | ALF_LAYOUT_INHERITBGCOLOR);
+    ALF_AddWidget(parent, x, y, hwndPanel, 0, 0, ALF_LAYOUT_SIZE_QUERY | ALF_LAYOUT_INHERITFONT | ALF_LAYOUT_INHERITBGCOLOR | ALF_LAYOUT_SENDBGCHANGE);
 
     return hwndPanel;
 }