[nautilus] view-icon-ui: add support for file previews

[Cosimo Cecchi <cosimoc src gnome org>]

commit 2d3dcbcfb78df09f8707a12b33468cd63da2b020
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Jul 6 14:30:52 2019 -0700

    view-icon-ui: add support for file previews
    
    Launch the previewer with spacebar like everywhere else.

 src/nautilus-view-icon-ui.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)
---
diff --git a/src/nautilus-view-icon-ui.c b/src/nautilus-view-icon-ui.c
index 2ccdf8b95..04f7bd4e7 100644
--- a/src/nautilus-view-icon-ui.c
+++ b/src/nautilus-view-icon-ui.c
@@ -153,12 +153,33 @@ on_child_activated (GtkFlowBox      *flow_box,
     NautilusViewItemModel *item_model;
     NautilusFile *file;
     g_autoptr (GList) list = NULL;
+    GdkEvent *event;
+    guint keyval;
+    gboolean is_preview = FALSE;
 
     item_model = nautilus_view_icon_item_ui_get_model (NAUTILUS_VIEW_ICON_ITEM_UI (child));
     file = nautilus_view_item_model_get_file (item_model);
     list = g_list_append (list, file);
 
-    nautilus_files_view_activate_files (NAUTILUS_FILES_VIEW (self->controller), list, 0, TRUE);
+    event = gtk_get_current_event ();
+    if (event && gdk_event_get_keyval (event, &keyval))
+    {
+        if (keyval == GDK_KEY_space)
+        {
+            is_preview = TRUE;
+        }
+    }
+
+    if (is_preview)
+    {
+        nautilus_files_view_preview_files (NAUTILUS_FILES_VIEW (self->controller), list, NULL);
+    }
+    else
+    {
+        nautilus_files_view_activate_files (NAUTILUS_FILES_VIEW (self->controller), list, 0, TRUE);
+    }
+
+    g_clear_pointer (&event, gdk_event_free);
 }
 
 static void