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StatusListViewでアイテムをキャッシュするようにした（そんなにテストしてない）

delete: "\202\302\202\242\202\351\202\361\202\351\202\361/Controls/StatusesListView.cs"

--- "a/\202\302\202\242\202\351\202\361\202\351\202\361/Controls/StatusesListView.cs"

+++ "b/\202\302\202\242\202\351\202\361\202\351\202\361/Controls/StatusesListView.cs"

		@@ -1,5 +1,7 @@
1		-using System.Collections.Generic;
	1	+using System;
	2	+using System.Collections.Generic;
2	3	using System.Drawing;
	4	+using System.Linq;
3	5	using System.Windows.Forms;
4	6
5	7	namespace Azyobuzi.Twirunrun

		@@ -13,6 +15,7 @@ namespace Azyobuzi.Twirunrun
13	15	this.VirtualMode = true;
14	16	this.HeaderStyle = ColumnHeaderStyle.None;
15	17	this.FullRowSelect = true;
	18	+ this.CacheVirtualItems += this_CacheVirtualItems;
16	19	this.RetrieveVirtualItem += this_RetrieveVirtualItem;
17	20	this.Columns.Add("名前", Settings.Instance.NameWidth);
18	21	this.Columns.Add("投稿");

		@@ -49,9 +52,8 @@ namespace Azyobuzi.Twirunrun
49	52	SetItemsCount(Statuses.Count);
50	53	}
51	54
52		- private void this_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
	55	+ private ListViewItem CreateListViewItem(StatusInfo item)
53	56	{
54		- var item = Statuses[e.ItemIndex];
55	57	var s = Settings.Instance;
56	58
57	59	var lvi = new ListViewItem();

		@@ -63,7 +65,25 @@ namespace Azyobuzi.Twirunrun
63	65
64	66	lvi.SubItems.Add(item.Text.Replace('\n', ' '));
65	67
66		- e.Item = lvi;
	68	+ return lvi;
	69	+ }
	70	+
	71	+ Dictionary<int, ListViewItem> itemcache = new Dictionary<int, ListViewItem>();
	72	+
	73	+ private void this_CacheVirtualItems(object sender, CacheVirtualItemsEventArgs e)
	74	+ {
	75	+ itemcache.Clear();
	76	+ Enumerable.Range(e.StartIndex, e.EndIndex - e.StartIndex)
	77	+ .Select(index => Tuple.Create(index, CreateListViewItem(Statuses[index])))
	78	+ .ForEach(_ => itemcache.Add(_.Item1, _.Item2));
	79	+ }
	80	+
	81	+ private void this_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
	82	+ {
	83	+ ListViewItem item = null;
	84	+ bool result = itemcache.TryGetValue(e.ItemIndex, out item);
	85	+ if (!result) item = CreateListViewItem(Statuses[e.ItemIndex]);
	86	+ e.Item = item;
67	87	}
68	88
69	89	//ラベルは保留