3 files changed, 20 insertions, 22 deletions
diff --git a/deck.c b/deck.c
index c2d462f..be2558a 100644
--- a/deck.c
+++ b/deck.c
@@ -89,3 +89,11 @@ deck_get_slide_location (Deck *deck,
     
     return nth_slide * (MARGIN + slide_height) + MARGIN;
 }
+
+int
+deck_get_height (Deck *deck, GdkRectangle *viewport)
+{
+    int slide_height = get_slide_height (deck, viewport);
+    
+    return N_SLIDES * slide_height + (N_SLIDES + 1) * MARGIN;
+}
diff --git a/deck.h b/deck.h
index b13eb89..5b01599 100644
--- a/deck.h
+++ b/deck.h
@@ -23,3 +23,5 @@ int
 deck_get_slide_location (Deck *deck,
 			 GdkRectangle *viewport,
 			 int nth_slide);
+int
+deck_get_height (Deck *deck, GdkRectangle *viewport);
diff --git a/main.c b/main.c
index 15739cd..f289edb 100644
--- a/main.c
+++ b/main.c
@@ -66,30 +66,18 @@ on_main_paint (FooScrollArea *scroll_area,
 
 static void
 on_main_viewport_size_changed (FooScrollArea *scroll_area,
-			  GdkRectangle  *viewport,
-			  GdkRectangle  *old_viewport)
+			       GdkRectangle  *new_viewport,
+			       GdkRectangle  *old_viewport,
+			       gpointer data)
 {
-    int total_height;
-    int nth_slide;
-    double old_y;
-    double new_y;
-
-    /* Compute the y-coordinate of the first visible top edge of a slide */
-    nth_slide = 
-	(old_viewport->y - MARGIN) / (MARGIN + (double)slide_height) + 1;
-
-    old_y = nth_slide * (MARGIN + (double)slide_height) + MARGIN;
-    
-    slide_width = viewport->width - 2 * MARGIN;
-    slide_height = slide_width / RATIO;
-    
-    new_y = nth_slide * (MARGIN + (double)slide_height) + MARGIN;
-    
-    total_height = N_SLIDES * slide_height + (N_SLIDES + 1) * MARGIN;
+    App *app = data;
+    int nth_slide = deck_get_view_slide (app->deck, old_viewport);
+    int old_location = deck_get_slide_location (app->deck, old_viewport, nth_slide);
+    int new_location = deck_get_slide_location (app->deck, new_viewport, nth_slide);
+    int height = deck_get_height (app->deck, new_viewport);
 
-    foo_scroll_area_set_size_fixed_y (scroll_area, viewport->width,
-				      total_height,
-				      old_y + 0.5, new_y + 0.5);
+    foo_scroll_area_set_size_fixed_y (scroll_area, new_viewport->width,
+				      height, old_location, new_location);
     
     foo_scroll_area_invalidate (scroll_area);
 }