nice visual effect (patch)

["Daniel Godas Lopez" <siro eurielec etsit upm es>]

i made a little "bouncing-icons" effect like the one they have in kde,
its not perfect at the moment but id like to know what you think about
it

i made the patch today against the head of the cvs

? jumping_icons.patch
Index: src/file-manager/fm-directory-view.c
===================================================================
RCS file: /cvs/gnome/nautilus/src/file-manager/fm-directory-view.c,v
retrieving revision 1.634
diff -p -u -r1.634 fm-directory-view.c
--- src/file-manager/fm-directory-view.c	18 Aug 2004 23:23:53 -0000	1.634
+++ src/file-manager/fm-directory-view.c	25 Aug 2004 12:43:28 -0000
@@ -6583,6 +6583,93 @@ cancel_activate_callback (gpointer callb
 	}
 }
 
+typedef struct {
+	GdkWindow *anim_window;
+	GdkPixbuf *anim_base_pixbuf;
+	GdkBitmap *anim_window_mask;
+
+	GdkWindowAttr *anim_window_attr;
+	GdkColormap   *anim_window_colormap;
+	GdkVisual 	  *anim_window_visual;
+
+	gint  x0, y0;
+	gint  w0, h0, last_w, last_h;
+	gint  counter;
+	guint frame;
+} anim_param;
+
+static gboolean
+handle_anim (gpointer p_)
+{
+	#define MAX_ANIM_TIME 200
+	#define N_OF_FRAMES	  42
+	#define MAX_OFFSET	  30
+
+	static guint offsets[N_OF_FRAMES] = {0, 1, 1, 2, 3, 4, 6, 9, 12, 15, 19, 23, 27,
+							    		 28, 28, 28, 29, 29, 29, 29, 30, 30, 29, 29,
+							    		 29, 29, 29, 29, 28, 28, 28, 27, 27, 26, 23,
+										 19, 16, 12, 9, 7, 4, 2};
+	gint x, y, w, h, floor;
+	GdkPixbuf  *anim_pixbuf;
+	anim_param *p = (anim_param*) p_;
+
+	p->frame = ( (p->frame)+1 == N_OF_FRAMES ? 0 : (p->frame)+1 );
+	gdk_display_get_pointer (gdk_display_get_default () ,NULL, &x, &y, NULL);
+	x += p->x0;
+	y += p->y0;
+	w = p->w0;
+	h = p->h0;
+	floor = y + MAX_OFFSET + ((3*h)/4);
+	y += offsets[p->frame];
+
+	if (floor-y < h) {
+		h  = floor-y;
+		anim_pixbuf = gdk_pixbuf_scale_simple (p->anim_base_pixbuf,
+											   w, h, GDK_INTERP_BILINEAR);
+	} else {
+		anim_pixbuf = p->anim_base_pixbuf;
+	}
+
+	if (p->counter == 0) {
+		gdk_window_show (p->anim_window);
+	}
+
+	gdk_window_move_resize (p->anim_window, x, y, w, h);
+	if (w != p->last_w || h != p->last_h) {
+		gdk_pixbuf_render_threshold_alpha (anim_pixbuf, p->anim_window_mask,
+										   0, 0, 0, 0, w, h, 120);
+		gdk_window_shape_combine_mask (p->anim_window, p->anim_window_mask, 0, 0);
+	}
+	gdk_draw_pixbuf (GDK_DRAWABLE (p->anim_window), NULL, anim_pixbuf, 0, 0, 0, 
+					 0, w, h, GDK_RGB_DITHER_NORMAL, 0, 0);
+
+	p->last_w = w;
+	p->last_h = h;
+	if (anim_pixbuf != p->anim_base_pixbuf) {
+		gdk_pixbuf_unref (anim_pixbuf);
+	}
+
+	/*
+	 * TODO: check if the thingie has been launched, in that case we should end 
+	 *		 the animation before MAX_ANIM_TIME
+	 */
+	if (++(p->counter) == MAX_ANIM_TIME) {
+		gdk_window_destroy (p->anim_window);
+		gdk_pixbuf_unref (p->anim_base_pixbuf);
+		gdk_bitmap_unref (p->anim_window_mask);
+		gdk_colormap_unref (p->anim_window_colormap);
+		g_free (p->anim_window_attr);
+		g_free (p);
+		return FALSE;
+	}
+	return TRUE;
+
+	#undef MAX_ANIM_TIME
+	#undef N_OF_FRAMES
+	#undef MAX_OFFSET
+}
+
+
 /**
  * fm_directory_view_activate_file:
  * 
@@ -6603,9 +6690,56 @@ fm_directory_view_activate_file (FMDirec
 	NautilusFileAttributes attributes;
 	char *file_name;
 	char *timed_wait_prompt;
+	GdkWindowAttr *anim_window_attr;	
+	GdkColormap *anim_window_colormap;
+	GdkVisual *anim_window_visual;
+	GdkWindow *anim_window;
+	GdkPixbuf *anim_base_pixbuf;
+	anim_param *p;
 
 	g_return_if_fail (FM_IS_DIRECTORY_VIEW (view));
 	g_return_if_fail (NAUTILUS_IS_FILE (file));
+	
+	/* prepare cool visual effect :) */
+	anim_base_pixbuf = nautilus_icon_factory_get_pixbuf_for_file (file, NULL,
+																  NAUTILUS_ICON_SIZE_SMALLER);
+	if (anim_base_pixbuf != NULL) {
+		anim_window_visual = gdk_visual_get_best ();
+		anim_window_colormap = gdk_colormap_new (anim_window_visual, TRUE);
+		anim_window_attr = g_new0 (GdkWindowAttr, 1);
+		anim_window_attr->event_mask = !GDK_ALL_EVENTS_MASK;
+		anim_window_attr->x = gdk_screen_get_width  (gdk_screen_get_default ());
+		anim_window_attr->y = gdk_screen_get_height (gdk_screen_get_default ());
+		anim_window_attr->width = gdk_pixbuf_get_width (anim_base_pixbuf);
+		anim_window_attr->height = gdk_pixbuf_get_height (anim_base_pixbuf);
+		anim_window_attr->wclass = GDK_INPUT_OUTPUT;
+		anim_window_attr->visual = anim_window_visual;
+		anim_window_attr->colormap = anim_window_colormap;
+		anim_window_attr->window_type = GDK_WINDOW_CHILD;
+		anim_window_attr->override_redirect = TRUE;
+		anim_window = gdk_window_new (NULL, anim_window_attr, 0x1FF1);
+		gdk_window_set_keep_above (anim_window, TRUE);
+		gdk_window_stick (anim_window);
+
+		p = g_new0 (anim_param, 1);
+		p->anim_window = anim_window;
+		p->anim_base_pixbuf = anim_base_pixbuf;
+		p->anim_window_mask = gdk_pixmap_new (NULL, anim_window_attr->width,
+											  anim_window_attr->height, 1);
+		p->anim_window_colormap = anim_window_colormap;
+		p->anim_window_visual = anim_window_visual;
+		p->anim_window_attr = anim_window_attr;
+		p->x0 = gdk_display_get_default_cursor_size (gdk_display_get_default ());
+		p->y0 = gdk_display_get_default_cursor_size (gdk_display_get_default ());
+		p->w0 = gdk_pixbuf_get_width (anim_base_pixbuf);
+		p->h0 = gdk_pixbuf_get_height (anim_base_pixbuf);
+		p->last_w = -1;
+		p->last_h = -1;
+		p->counter = -1;
+		p->frame   = 0;
+
+		g_timeout_add (40, handle_anim, p);
+	}
 
 	/* link target info might be stale, re-read it */
 	if (nautilus_file_is_symbolic_link (file)) {