From e9de907f9ea18b3e8363c2498d5b3e84502d558e Mon Sep 17 00:00:00 2001
From: Cosimo Cecchi <cosimoc@gnome.org>
Date: Wed, 14 Sep 2011 17:32:02 -0400
Subject: [PATCH] iconview: add support for prelight cells

Render GtkIconView cell items with the prelight state flag when they're
being mouse hovered.
This works basically in the same way it's done for GtkTreeView cells,
and e.g. GtkCellRendererPixbuf will need to have its follow-state
property to opt in to prelight rendering.

https://bugzilla.gnome.org/show_bug.cgi?id=615501
---
 gtk/gtkiconview.c | 44 +++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/gtk/gtkiconview.c b/gtk/gtkiconview.c
index 23248891c0..7c4b41b0ae 100644
--- a/gtk/gtkiconview.c
+++ b/gtk/gtkiconview.c
@@ -82,6 +82,7 @@ struct _GtkIconViewItem
   
   gint row, col;
 
+  guint prelight : 1;
   guint selected : 1;
   guint selected_before_rubberbanding : 1;
 
@@ -134,6 +135,7 @@ struct _GtkIconViewPrivate
   GtkIconViewItem *cursor_item;
 
   GtkIconViewItem *last_single_clicked;
+  GtkIconViewItem *last_prelight;
 
   GtkOrientation item_orientation;
 
@@ -1740,6 +1742,33 @@ gtk_icon_view_motion (GtkWidget      *widget,
       else 
 	remove_scroll_timeout (icon_view);
     }
+  else
+    {
+      GtkIconViewItem *item, *last_prelight_item;
+      GtkCellRenderer *cell = NULL;
+
+      last_prelight_item = icon_view->priv->last_prelight;
+      item = gtk_icon_view_get_item_at_coords (icon_view,
+                                               event->x, event->y,
+                                               FALSE,
+                                               &cell);
+
+      if (item != NULL)
+        {
+          item->prelight = TRUE;
+          gtk_icon_view_queue_draw_item (icon_view, item);
+        }
+
+      if (last_prelight_item != NULL &&
+          last_prelight_item != item)
+        {
+          last_prelight_item->prelight = FALSE;
+          gtk_icon_view_queue_draw_item (icon_view,
+                                         icon_view->priv->last_prelight);
+        }
+
+      icon_view->priv->last_prelight = item;
+    }
   
   return TRUE;
 }
@@ -2947,9 +2976,18 @@ gtk_icon_view_paint_item (GtkIconView     *icon_view,
 
       state |= GTK_STATE_FLAG_SELECTED;
       flags |= GTK_CELL_RENDERER_SELECTED;
+    }
+
+  if (item->prelight)
+    {
+      state |= GTK_STATE_FLAG_PRELIGHT;
+      flags |= GTK_CELL_RENDERER_PRELIT;
+    }
 
-      gtk_style_context_set_state (style_context, state);
+  gtk_style_context_set_state (style_context, state);
 
+  if (item->selected)
+    {
       gtk_render_background (style_context, cr,
                              x - icon_view->priv->item_padding,
                              y - icon_view->priv->item_padding,
@@ -3368,6 +3406,9 @@ gtk_icon_view_row_deleted (GtkTreeModel *model,
   if (item == icon_view->priv->cursor_item)
     icon_view->priv->cursor_item = NULL;
 
+  if (item == icon_view->priv->last_prelight)
+    icon_view->priv->last_prelight = NULL;
+
   if (item->selected)
     emit = TRUE;
   
@@ -4845,6 +4886,7 @@ gtk_icon_view_set_model (GtkIconView *icon_view,
       icon_view->priv->anchor_item = NULL;
       icon_view->priv->cursor_item = NULL;
       icon_view->priv->last_single_clicked = NULL;
+      icon_view->priv->last_prelight = NULL;
       icon_view->priv->width = 0;
       icon_view->priv->height = 0;
     }
-- 
2.30.2