Exemplo n.º 1
0
        /// <summary>
        /// Create a collection of clusters that should be presented to the user
        /// </summary>
        /// <param name="strategy"></param>
        /// <param name="listView"></param>
        /// <param name="column"></param>
        /// <returns></returns>
        virtual protected List <ICluster> Cluster(IClusteringStrategy strategy, ObjectListView listView, OLVColumn column)
        {
            // Build a map that correlates cluster key to clusters
            NullableDictionary <object, ICluster> map = new NullableDictionary <object, ICluster>();
            int count = 0;

            //++Added by KhoiVV
            if (listView.Objects == null)
            {
                return(new List <ICluster>(map.Values));
            }
            //--Added by KhoiVV

            foreach (object model in listView.ObjectsForClustering)
            {
                this.ClusterOneModel(strategy, map, model);

                if (count++ > this.MaxObjectsToConsider)
                {
                    break;
                }
            }

            // Now that we know exactly how many items are in each cluster, create a label for it
            foreach (ICluster cluster in map.Values)
            {
                cluster.DisplayLabel = strategy.GetClusterDisplayLabel(cluster);
            }

            return(new List <ICluster>(map.Values));
        }
Exemplo n.º 2
0
        private void ClusterOneModel(IClusteringStrategy strategy, NullableDictionary <object, ICluster> map, object model)
        {
            object clusterKey = strategy.GetClusterKey(model);

            // If the returned value is an IEnumerable, that means the given model can belong to more than one cluster
            IEnumerable keyEnumerable = clusterKey as IEnumerable;

            if (clusterKey is string || keyEnumerable == null)
            {
                keyEnumerable = new object[] { clusterKey }
            }
            ;

            // Deal with nulls and DBNulls
            ArrayList nullCorrected = new ArrayList();

            foreach (object key in keyEnumerable)
            {
                if (key == null || key == System.DBNull.Value)
                {
                    if (this.TreatNullAsDataValue)
                    {
                        nullCorrected.Add(null);
                    }
                }
                else
                {
                    nullCorrected.Add(key);
                }
            }

            // Group by key
            foreach (object key in nullCorrected)
            {
                if (map.ContainsKey(key))
                {
                    map[key].Count += 1;
                }
                else
                {
                    map[key] = strategy.CreateCluster(key);
                }
            }
        }
Exemplo n.º 3
0
        /// <summary>
        /// Create groups for FastListView
        /// </summary>
        /// <param name="parmameters"></param>
        /// <returns></returns>
        public override IList <OLVGroup> GetGroups(GroupingParameters parmameters)
        {
            // There is a lot of overlap between this method and ObjectListView.MakeGroups()
            // Any changes made here may need to be reflected there

            // This strategy can only be used on FastObjectListViews
            FastObjectListView folv = (FastObjectListView)parmameters.ListView;

            // Separate the list view items into groups, using the group key as the descrimanent
            int objectCount = 0;
            NullableDictionary <object, List <object> > map = new NullableDictionary <object, List <object> >();

            foreach (object model in folv.FilteredObjects)
            {
                object key = parmameters.GroupByColumn.GetGroupKey(model);
                if (!map.ContainsKey(key))
                {
                    map[key] = new List <object>();
                }
                map[key].Add(model);
                objectCount++;
            }

            // Sort the items within each group
            // TODO: Give parameters a ModelComparer property
            OLVColumn           primarySortColumn = parmameters.SortItemsByPrimaryColumn ? parmameters.ListView.GetColumn(0) : parmameters.PrimarySort;
            ModelObjectComparer sorter            = new ModelObjectComparer(primarySortColumn, parmameters.PrimarySortOrder,
                                                                            parmameters.SecondarySort, parmameters.SecondarySortOrder);

            foreach (object key in map.Keys)
            {
                map[key].Sort(sorter);
            }

            // Make a list of the required groups
            List <OLVGroup> groups = new List <OLVGroup>();

            foreach (object key in map.Keys)
            {
                string title = parmameters.GroupByColumn.ConvertGroupKeyToTitle(key);
                if (!String.IsNullOrEmpty(parmameters.TitleFormat))
                {
                    int    count  = map[key].Count;
                    string format = (count == 1 ? parmameters.TitleSingularFormat : parmameters.TitleFormat);
                    try {
                        title = String.Format(format, title, count);
                    } catch (FormatException) {
                        title = "Invalid group format: " + format;
                    }
                }
                OLVGroup lvg = new OLVGroup(title);
                lvg.Collapsible      = folv.HasCollapsibleGroups;
                lvg.Key              = key;
                lvg.SortValue        = key as IComparable;
                lvg.Contents         = map[key].ConvertAll <int>(delegate(object x) { return(folv.IndexOf(x)); });
                lvg.VirtualItemCount = map[key].Count;
                if (parmameters.GroupByColumn.GroupFormatter != null)
                {
                    parmameters.GroupByColumn.GroupFormatter(lvg, parmameters);
                }
                groups.Add(lvg);
            }

            // Sort the groups
            if (parmameters.GroupByOrder != SortOrder.None)
            {
                groups.Sort(parmameters.GroupComparer ?? new OLVGroupComparer(parmameters.GroupByOrder));
            }

            // Build an array that remembers which group each item belongs to.
            this.indexToGroupMap = new List <int>(objectCount);
            this.indexToGroupMap.AddRange(new int[objectCount]);

            for (int i = 0; i < groups.Count; i++)
            {
                OLVGroup   group   = groups[i];
                List <int> members = (List <int>)group.Contents;
                foreach (int j in members)
                {
                    this.indexToGroupMap[j] = i;
                }
            }

            return(groups);
        }