[PATCH] [5/?] grub-core/gfxmenu/gui_list.c - print scrollbar in separate viewport

[Vladimir Testov <vladimir.testov@rosalab.ru>]

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Changelog entry: grub-core/gfxmenu/gui_list.c: print scrollbar in separate 
viewport

Print the scrollbar in the separate viewport. Patch makes it clear where 
exactly the scrollbar will be drawn. Also it simplifies the drawing of the 
scrollbar.

scrollbar thumb and frame processing has been fixed. Now we can use any kind of 
styled box for thumb and frame.

scrollbar_width is total width of the scrollbar

backward compatibility is contained

-- 
With best regards,
_______________________________
Vladimir Testov, ROSA Laboratory.
www.rosalab.ru

[-- Attachment #2: grub-list-scrollbar-print-in-viewport.patch --]
[-- Type: text/x-patch, Size: 3347 bytes --]

diff -Naur grub-new4/grub-core/gfxmenu/gui_list.c grub-new5/grub-core/gfxmenu/gui_list.c
--- grub-new4/grub-core/gfxmenu/gui_list.c	2013-07-15 16:36:34.544169956 +0400
+++ grub-new5/grub-core/gfxmenu/gui_list.c	2013-07-17 18:57:56.597740755 +0400
@@ -211,7 +211,7 @@
 static void
 draw_scrollbar (list_impl_t self,
                 int value, int extent, int min, int max,
-                int rightx, int topy, int height)
+                int scrollbar_width, int scrollbar_height)
 {
   grub_gfxmenu_box_t frame = self->scrollbar_frame;
   grub_gfxmenu_box_t thumb = self->scrollbar_thumb;
@@ -219,21 +219,23 @@
                             + frame->get_bottom_pad (frame));
   int frame_horizontal_pad = (frame->get_left_pad (frame)
                               + frame->get_right_pad (frame));
-  int tracktop = topy + frame->get_top_pad (frame);
-  int tracklen = height - frame_vertical_pad;
-  frame->set_content_size (frame, self->scrollbar_width, tracklen);
+  int thumb_vertical_pad = (thumb->get_top_pad (thumb)
+                            + thumb->get_bottom_pad (thumb));
+  int thumb_horizontal_pad = (thumb->get_left_pad (thumb)
+                              + thumb->get_right_pad (thumb));
+  int tracktop = frame->get_top_pad (frame);
+  int tracklen = scrollbar_height - frame_vertical_pad;
+  frame->set_content_size (frame,
+                           scrollbar_width - frame_horizontal_pad,
+                           tracklen);
   int thumby = tracktop + tracklen * (value - min) / (max - min);
   int thumbheight = tracklen * extent / (max - min) + 1;
   thumb->set_content_size (thumb,
-                           self->scrollbar_width - frame_horizontal_pad,
-                           thumbheight - (thumb->get_top_pad (thumb)
-                                          + thumb->get_bottom_pad (thumb)));
-  frame->draw (frame,
-               rightx - (self->scrollbar_width + frame_horizontal_pad),
-               topy);
-  thumb->draw (thumb,
-               rightx - (self->scrollbar_width - frame->get_right_pad (frame)),
-               thumby);
+                           scrollbar_width - frame_horizontal_pad
+                           - thumb_horizontal_pad,
+                           thumbheight - thumb_vertical_pad);
+  frame->draw (frame, 0, 0);
+  thumb->draw (thumb, frame->get_left_pad (frame), thumby);
 }
 
 /* Draw the list of items.  */
@@ -390,13 +392,19 @@
     grub_gui_restore_viewport (&vpsave2);
 
     if (drawing_scrollbar)
-      draw_scrollbar (self,
-		      self->first_shown_index, num_shown_items,
-		      0, self->view->menu->size,
-		      self->bounds.width - box_right_pad
-		      + self->scrollbar_width,
-		      box_top_pad,
-		      self->bounds.height - box_top_pad - box_bottom_pad);
+      {
+        /* Draw the scrollbar in the east slice. */
+        content_rect.x = self->bounds.width - box_right_pad;
+        content_rect.width = box_right_pad;
+
+        grub_gui_set_viewport (&content_rect, &vpsave2);
+        draw_scrollbar (self,
+                        self->first_shown_index, num_shown_items,
+                        0, self->view->menu->size,
+                        self->scrollbar_width,
+                        content_rect.height);
+        grub_gui_restore_viewport (&vpsave2);
+      }
   }
 
   grub_gui_restore_viewport (&vpsave);