[gtk+] [win32] Properly draw the menu separator for Windows Vista/7. Also adds the bits for transparency.

[Fridrich Strba <strba src gnome org>]

commit e14560cf1ebf345feed03356813d73fbe392ded0
Author: Martin Schlemmer <11285613 nwu ac za>
Date:   Mon Aug 30 20:03:04 2010 +0200

    [win32] Properly draw the menu separator for Windows Vista/7.
    Also adds the bits for transparency.

 modules/engines/ms-windows/msw_style.c     |   15 ++++++-
 modules/engines/ms-windows/xp_theme.c      |   69 +++++++++++++++++++++++++++-
 modules/engines/ms-windows/xp_theme.h      |    3 +
 modules/engines/ms-windows/xp_theme_defs.h |    6 ++
 4 files changed, 91 insertions(+), 2 deletions(-)
---
diff --git a/modules/engines/ms-windows/msw_style.c b/modules/engines/ms-windows/msw_style.c
index e76519b..d08e1cd 100755
--- a/modules/engines/ms-windows/msw_style.c
+++ b/modules/engines/ms-windows/msw_style.c
@@ -2903,8 +2903,21 @@ draw_hline (GtkStyle *style,
 {
   if (xp_theme_is_active () && detail && !strcmp (detail, "menuitem"))
     {
+      gint cx, cy;
+      gint new_y, new_height;
+      gint y_offset;
+
+      xp_theme_get_element_dimensions (XP_THEME_ELEMENT_MENU_SEPARATOR,
+				       state_type,
+				       &cx, &cy);
+
+      /* Center the separator */
+      y_offset = (area->height / 2) - (cy / 2);
+      new_y = y_offset >= 0 ? area->y + y_offset : area->y;
+      new_height = cy;
+
       if (xp_theme_draw
-	  (window, XP_THEME_ELEMENT_MENU_SEPARATOR, style, x1, y, x2, 1,
+	  (window, XP_THEME_ELEMENT_MENU_SEPARATOR, style, x1, new_y, x2, new_height,
 	   state_type, area))
 	{
 	  return;
diff --git a/modules/engines/ms-windows/xp_theme.c b/modules/engines/ms-windows/xp_theme.c
index f864515..79698ac 100755
--- a/modules/engines/ms-windows/xp_theme.c
+++ b/modules/engines/ms-windows/xp_theme.c
@@ -86,6 +86,7 @@
 #define MBI_DISABLEDHOT    5
 #define MBI_DISABLEDPUSHED 6
 
+#define MENU_POPUPGUTTER    13
 #define MENU_POPUPITEM      14
 #define MENU_POPUPSEPARATOR 15
 
@@ -188,6 +189,13 @@ typedef BOOL (FAR PASCAL *IsThemeBackgroundPartiallyTransparentFunc) (HTHEME hTh
 typedef HRESULT (FAR PASCAL *DrawThemeParentBackgroundFunc) (HWND hwnd,
 							     HDC hdc,
 							     RECT *prc);
+typedef HRESULT (FAR PASCAL *GetThemePartSizeFunc)          (HTHEME hTheme,
+							     HDC hdc,
+							     int iPartId,
+							     int iStateId,
+							     RECT *prc,
+							     int eSize,
+							     SIZE *psz);
 
 static GetThemeSysFontFunc get_theme_sys_font_func = NULL;
 static GetThemeSysColorFunc get_theme_sys_color_func = NULL;
@@ -200,6 +208,7 @@ static IsThemeActiveFunc is_theme_active_func = NULL;
 static IsAppThemedFunc is_app_themed_func = NULL;
 static IsThemeBackgroundPartiallyTransparentFunc is_theme_partially_transparent_func = NULL;
 static DrawThemeParentBackgroundFunc draw_theme_parent_background_func = NULL;
+static GetThemePartSizeFunc get_theme_part_size_func = NULL;
 
 static void
 xp_theme_close_open_handles (void)
@@ -242,6 +251,7 @@ xp_theme_init (void)
       get_theme_sys_metric_func = (GetThemeSysSizeFunc) GetProcAddress (uxtheme_dll, "GetThemeSysSize");
       is_theme_partially_transparent_func = (IsThemeBackgroundPartiallyTransparentFunc) GetProcAddress (uxtheme_dll, "IsThemeBackgroundPartiallyTransparent");
       draw_theme_parent_background_func = (DrawThemeParentBackgroundFunc) GetProcAddress (uxtheme_dll, "DrawThemeParentBackground");
+      get_theme_part_size_func = (GetThemePartSizeFunc) GetProcAddress (uxtheme_dll, "GetThemePartSize");
     }
 
   if (is_app_themed_func && is_theme_active_func)
@@ -292,6 +302,7 @@ xp_theme_exit (void)
   get_theme_sys_metric_func = NULL;
   is_theme_partially_transparent_func = NULL;
   draw_theme_parent_background_func = NULL;
+  get_theme_part_size_func = NULL;
 }
 
 static HTHEME
@@ -782,8 +793,11 @@ xp_theme_map_gtk_state (XpThemeElement element, GtkStateType state)
       ret = 1;
       break;
 
-    case XP_THEME_ELEMENT_MENU_ITEM:
     case XP_THEME_ELEMENT_MENU_SEPARATOR:
+      ret = TS_NORMAL;
+      break;
+
+    case XP_THEME_ELEMENT_MENU_ITEM:
       switch (state)
 	{
 	case GTK_STATE_SELECTED:
@@ -934,6 +948,10 @@ xp_theme_draw (GdkWindow *win, XpThemeElement element, GtkStyle *style,
 
   part_state = xp_theme_map_gtk_state (element, state_type);
 
+  /* Support transparency */
+  if (is_theme_partially_transparent_func (theme, element_part_map[element], part_state))
+    draw_theme_parent_background_func (GDK_WINDOW_HWND (win), dc, pClip);
+
   draw_theme_background_func (theme, dc, element_part_map[element],
 			      part_state, &rect, pClip);
 
@@ -958,6 +976,55 @@ xp_theme_is_drawable (XpThemeElement element)
 }
 
 gboolean
+xp_theme_get_element_dimensions (XpThemeElement element,
+				 GtkStateType state_type,
+				 gint *cx, gint *cy)
+{
+  HTHEME theme;
+  SIZE part_size;
+  int part_state;
+
+  if (!xp_theme_is_active ())
+    return FALSE;
+
+  theme = xp_theme_get_handle_by_element (element);
+  if (!theme)
+    return FALSE;
+
+  part_state = xp_theme_map_gtk_state (element, state_type);
+
+  get_theme_part_size_func (theme,
+			    NULL,
+			    element_part_map[element],
+			    part_state,
+			    NULL,
+			    TS_MIN,
+			    &part_size);
+
+  *cx = part_size.cx;
+  *cy = part_size.cy;
+
+  if (element == XP_THEME_ELEMENT_MENU_ITEM ||
+      element == XP_THEME_ELEMENT_MENU_SEPARATOR)
+  {
+    SIZE gutter_size;
+
+    get_theme_part_size_func (theme,
+			      NULL,
+			      MENU_POPUPGUTTER,
+			      0,
+			      NULL,
+			      TS_MIN,
+			      &gutter_size);
+
+	*cx += gutter_size.cx * 2;
+	*cy += gutter_size.cy * 2;
+  }
+
+  return TRUE;
+}
+
+gboolean
 xp_theme_get_system_font (XpThemeClass klazz, XpThemeFont fontId,
 			  OUT LOGFONTW *lf)
 {
diff --git a/modules/engines/ms-windows/xp_theme.h b/modules/engines/ms-windows/xp_theme.h
index 2d172f3..dfacb43 100755
--- a/modules/engines/ms-windows/xp_theme.h
+++ b/modules/engines/ms-windows/xp_theme.h
@@ -141,6 +141,9 @@ gboolean xp_theme_draw (GdkWindow *win, XpThemeElement element,
                         int height, GtkStateType state_type,
                         GdkRectangle *area);
 gboolean xp_theme_is_drawable (XpThemeElement element);
+gboolean xp_theme_get_element_dimensions (XpThemeElement element,
+                                          GtkStateType state_type,
+                                          gint *cx, gint *cy);
 gboolean xp_theme_get_system_font (XpThemeClass klazz, XpThemeFont fontId, OUT LOGFONTW *lf);
 gboolean xp_theme_get_system_color (XpThemeClass klazz, int colorId, OUT DWORD *pColor);
 gboolean xp_theme_get_system_metric (XpThemeClass klazz, int metricId, OUT int *pVal);
diff --git a/modules/engines/ms-windows/xp_theme_defs.h b/modules/engines/ms-windows/xp_theme_defs.h
index 49f5179..aaae6d9 100644
--- a/modules/engines/ms-windows/xp_theme_defs.h
+++ b/modules/engines/ms-windows/xp_theme_defs.h
@@ -756,4 +756,10 @@ enum {
   VTS_DISABLED = 4
 };
 
+enum {
+  TS_MIN,
+  TS_TRUE,
+  TS_DRAW
+};
+
 #endif /* XP_THEME_DFNS_H */