TODO; draw some slides

1 files changed, 71 insertions, 11 deletions

diff --git a/main.c b/main.c
index 88fd969..8f4289c 100644
--- a/main.c
+++ b/main.c
@@ -35,6 +35,13 @@ on_thumbs_paint (FooScrollArea *scroll_area,
 }
 	
 
+#define MARGIN		20
+#define RATIO		1.414
+#define N_SLIDES	10
+
+int slide_width;
+int slide_height;
+
 static void
 on_main_paint (FooScrollArea *scroll_area,
 	       cairo_t	     *cr,
@@ -42,10 +49,74 @@ on_main_paint (FooScrollArea *scroll_area,
 	       GdkRegion     *region,
 	       gpointer       data)
 {
+    int i;
+
+    cairo_move_to (cr, MARGIN, MARGIN);
+    
+    for (i = 0; i < N_SLIDES; ++i)
+    {
+	cairo_move_to (cr, MARGIN, MARGIN + i * (MARGIN + slide_height));
+	
+	cairo_set_source_rgba (cr, 1, 1, 1, 1);
+
+	cairo_rel_line_to (cr, slide_width, 0);
+	cairo_rel_line_to (cr, 0, slide_height);
+	cairo_rel_line_to (cr, -slide_width, 0);
+	cairo_close_path (cr);
+
+	cairo_fill_preserve (cr);
+
+	cairo_set_source_rgba (cr, 0, 0, 0, 0.5);
+	cairo_set_line_width (cr, 2);
+	cairo_stroke (cr);
+
+    }
+    
     g_print ("paint %d %d %d %d\n", extents->x, extents->y, extents->width, extents->height);
 }
 
 static void
+on_viewport_changed (FooScrollArea *scroll_area, 
+                     GdkRectangle  *viewport,
+                     GdkRectangle  *old_viewport)
+{
+    int th;
+    double ratio;
+
+    if (old_viewport)
+    {
+	slide_width = viewport->width - 2 * MARGIN;
+	slide_height = slide_width / RATIO;
+	
+	th = N_SLIDES * slide_height + (N_SLIDES + 1) * MARGIN;
+	
+	g_print ("new slide height: %d, new y: %d\n", slide_height, viewport->y);
+	
+	/* FIXME: We can recurse infinitely here when the area gets
+	 * narrow enough that the scrollbar disappears causing the area
+	 * to widen a little causing the scrollbar to appear causing
+	 * the arrow to narrow causing ...
+	 *
+	 * For now we work around by have POLICY_ALWAYS on the scrollbar,
+	 * it needs to be thought through and fixed in the scroll area
+	 */
+	
+	ratio = (double)viewport->width / old_viewport->width;
+	
+	g_print ("ratio: %f (%d %d)\n", ratio, old_viewport->y, (int)(old_viewport->y * ratio));
+	
+	foo_scroll_area_set_size_fixed_y (scroll_area, viewport->width, th,
+					  old_viewport->y + 100,
+					  (old_viewport->y + 100) * ratio + 0.5);
+    }
+    
+#if 0
+    foo_scroll_area_set_size (scroll_area, viewport->width, th);
+#endif
+    foo_scroll_area_invalidate (scroll_area);
+}
+
+static void
 set_size (GtkWindow *window)
 {
     GdkScreen *screen;
@@ -65,14 +136,6 @@ set_size (GtkWindow *window)
     gtk_window_resize (window, width, height);
 }
 
-static void
-on_viewport_changed (FooScrollArea *scroll_area, 
-                     GdkRectangle  *viewport,
-                     GdkRectangle  *old_viewport)
-{
-    foo_scroll_area_set_size (scroll_area, 800, 30);
-}
-
 int
 main (int argc, char **argv)
 {
@@ -94,15 +157,12 @@ main (int argc, char **argv)
 	GTK_CONTAINER (get_widget (app, "thumbnails_scrolled_window")),
 	app->thumbnails);
 
-    foo_scroll_area_set_size (app->main_area, 80, 30);
     foo_scroll_area_set_min_size (app->thumbnails, 200, -1);
 
     g_signal_connect (app->main_area, "paint",
 		      G_CALLBACK (on_main_paint), app);
-#if 0
     g_signal_connect (app->main_area, "viewport_changed",
 		      G_CALLBACK (on_viewport_changed), app);
-#endif
     
     g_signal_connect (app->thumbnails, "paint",
 		      G_CALLBACK (on_thumbs_paint), app);