public override void BuildNode(ITreeBuilder builder, object dataObject, NodeInfo nodeInfo)
        {
            string thisPath = GetFolderPath(dataObject);

            if ((dataObject is ProjectFolder) && builder.Options ["ShowAllFiles"] && Directory.Exists(thisPath))
            {
                ProjectFolder pf = (ProjectFolder)dataObject;
                if (pf.Project == null || !ProjectFolderCommandHandler.PathExistsInProject(pf.Project, thisPath))
                {
                    var gicon = Context.GetComposedIcon(nodeInfo.Icon, "fade");
                    if (gicon == null)
                    {
                        gicon = nodeInfo.Icon.WithAlpha(0.5);
                        Context.CacheComposedIcon(nodeInfo.Icon, "fade", gicon);
                    }
                    nodeInfo.Icon = gicon;
                    gicon         = Context.GetComposedIcon(nodeInfo.ClosedIcon, "fade");
                    if (gicon == null)
                    {
                        gicon = nodeInfo.ClosedIcon.WithAlpha(0.5);
                        Context.CacheComposedIcon(nodeInfo.ClosedIcon, "fade", gicon);
                    }
                    nodeInfo.ClosedIcon = gicon;
                }
            }
        }
        public override void BuildNode(ITreeBuilder builder, object dataObject, ref string label, ref Gdk.Pixbuf icon, ref Gdk.Pixbuf closedIcon)
        {
            string thisPath = GetFolderPath(dataObject);

            if ((dataObject is ProjectFolder) && builder.Options ["ShowAllFiles"] && Directory.Exists(thisPath))
            {
                ProjectFolder pf = (ProjectFolder)dataObject;
                if (pf.Project == null || !ProjectFolderCommandHandler.PathExistsInProject(pf.Project, thisPath))
                {
                    Gdk.Pixbuf gicon = Context.GetComposedIcon(icon, "fade");
                    if (gicon == null)
                    {
                        gicon = ImageService.MakeTransparent(icon, 0.5);
                        Context.CacheComposedIcon(icon, "fade", gicon);
                    }
                    icon  = gicon;
                    gicon = Context.GetComposedIcon(closedIcon, "fade");
                    if (gicon == null)
                    {
                        gicon = ImageService.MakeTransparent(closedIcon, 0.5);
                        Context.CacheComposedIcon(closedIcon, "fade", gicon);
                    }
                    closedIcon = gicon;
                }
            }
        }
        void OnSystemFileDeleted(object sender, FileEventArgs args)
        {
            if (Context.Tree.IsDestroyed)
            {
                return;
            }
            foreach (FileEventInfo e in args)
            {
                try {
                    Project project = GetProjectForFile(e.FileName);

                    ITreeBuilder tb = Context.GetTreeBuilder();

                    if (e.IsDirectory)
                    {
                        if (tb.MoveToObject(new ProjectFolder(e.FileName, project)))
                        {
                            if (tb.Options ["ShowAllFiles"] && (project == null || !ProjectFolderCommandHandler.PathExistsInProject(project, e.FileName)))
                            {
                                tb.Remove();
                                return;
                            }
                        }
                    }
                    else
                    {
                        if (tb.MoveToObject(new SystemFile(e.FileName, project)))
                        {
                            tb.Remove();
                            return;
                        }
                    }

                    // Find the parent folder, and update it's children count

                    string parentPath = Path.GetDirectoryName(e.FileName);
                    if (tb.MoveToObject(new ProjectFolder(parentPath, project)))
                    {
                        if (tb.Options ["ShowAllFiles"] && Directory.Exists(parentPath))
                        {
                            tb.UpdateChildren();
                        }
                    }
                } catch (Exception ex) {
                    LoggingService.LogInternalError($"Error while updating project tree in OnSystemFileDeleted : {string.Join (", ", args.Select (x => x.FileName))}.", ex);
                }
            }
        }
        void OnSystemFileDeleted(object sender, FileEventArgs args)
        {
            foreach (FileEventInfo e in args)
            {
                Project project = GetProjectForFile(e.FileName);
                if (project == null)
                {
                    return;
                }

                ITreeBuilder tb = Context.GetTreeBuilder();

                if (e.IsDirectory)
                {
                    if (tb.MoveToObject(new ProjectFolder(e.FileName, project)))
                    {
                        if (tb.Options ["ShowAllFiles"] && !ProjectFolderCommandHandler.PathExistsInProject(project, e.FileName))
                        {
                            tb.Remove();
                            return;
                        }
                    }
                }
                else
                {
                    if (tb.MoveToObject(new SystemFile(e.FileName, project)))
                    {
                        tb.Remove();
                        return;
                    }
                }

                // Find the parent folder, and update it's children count

                string parentPath = Path.GetDirectoryName(e.FileName);
                if (tb.MoveToObject(new ProjectFolder(parentPath, project)))
                {
                    if (tb.Options ["ShowAllFiles"] && Directory.Exists(parentPath))
                    {
                        tb.UpdateChildren();
                    }
                }
            }
        }