private void createFilterIndex(ICollection <ListViewGroup> grps)
{
ToolStripMenuItem toolstrip_index_other = new ToolStripMenuItem("その他");
ToolStripMenuItem toolstrip_index_num = new ToolStripMenuItem("数字");
ToolStripMenuItem toolstrip_index_alpha = new ToolStripMenuItem("A-Z");
ToolStripMenuItem toolstrip_index_kana_a = new ToolStripMenuItem("あ");
ToolStripMenuItem toolstrip_index_kana_k = new ToolStripMenuItem("か");
ToolStripMenuItem toolstrip_index_kana_s = new ToolStripMenuItem("さ");
ToolStripMenuItem toolstrip_index_kana_t = new ToolStripMenuItem("た");
ToolStripMenuItem toolstrip_index_kana_n = new ToolStripMenuItem("な");
ToolStripMenuItem toolstrip_index_kana_h = new ToolStripMenuItem("は");
ToolStripMenuItem toolstrip_index_kana_m = new ToolStripMenuItem("ま");
ToolStripMenuItem toolstrip_index_kana_y = new ToolStripMenuItem("や");
ToolStripMenuItem toolstrip_index_kana_r = new ToolStripMenuItem("ら");
ToolStripMenuItem toolstrip_index_kana_w = new ToolStripMenuItem("わ");
var kanas = new ToolStripMenuItem[] {
toolstrip_index_kana_a,
toolstrip_index_kana_k,
toolstrip_index_kana_s,
toolstrip_index_kana_t,
toolstrip_index_kana_n,
toolstrip_index_kana_h,
toolstrip_index_kana_m,
toolstrip_index_kana_y,
toolstrip_index_kana_r,
toolstrip_index_kana_w,
};
this.ContextMenuStrip.Items.Add(new ToolStripSeparator());
var charTypes = new ToolStripMenuItem[] {
toolstrip_index_num,
toolstrip_index_alpha,
toolstrip_index_kana_a,
toolstrip_index_kana_k,
toolstrip_index_kana_s,
toolstrip_index_kana_t,
toolstrip_index_kana_n,
toolstrip_index_kana_h,
toolstrip_index_kana_m,
toolstrip_index_kana_y,
toolstrip_index_kana_r,
toolstrip_index_kana_w,
toolstrip_index_other,
};
this.ContextMenuStrip.Items.AddRange(charTypes);
foreach (var e in kanas.Concat(charTypes))
{
var self = e; // ブロック内に参照コピー
e.Enabled = false;
e.Click += (x, y) => self.DropDownItems[0].PerformClick();
}
foreach (ListViewGroup grp in grps)
{
char c = grp.Header[0];
if (c == ' ')
{
continue;
}
ToolStripMenuItem target = toolstrip_index_other;
if ('A' <= c && 'Z' >= c)
{
target = toolstrip_index_alpha;
}
else if ('0' <= c && '9' >= c)
{
target = toolstrip_index_num;
}
else if ('あ' <= c && 'お' >= c)
{
target = toolstrip_index_kana_a;
}
else if ('か' <= c && 'こ' >= c)
{
target = toolstrip_index_kana_k;
}
else if ('さ' <= c && 'そ' >= c)
{
target = toolstrip_index_kana_s;
}
else if ('た' <= c && 'と' >= c)
{
target = toolstrip_index_kana_t;
}
else if ('な' <= c && 'の' >= c)
{
target = toolstrip_index_kana_n;
}
else if ('は' <= c && 'ほ' >= c)
{
target = toolstrip_index_kana_h;
}
else if ('ま' <= c && 'も' >= c)
{
target = toolstrip_index_kana_m;
}
else if ('や' <= c && 'よ' >= c)
{
target = toolstrip_index_kana_y;
}
else if ('ら' <= c && 'ろ' >= c)
{
target = toolstrip_index_kana_r;
}
else if ('わ' <= c && 'ん' >= c)
{
target = toolstrip_index_kana_w;
}
int index = grp.Items[0].Index;
var item = grp.Items[0];
var last = grps.Last().Items[grps.Last().Items.Count - 1].Index; // 最後のグループの最後の項目
target.Enabled = true;
if (target.OwnerItem != null)
{
target.OwnerItem.Enabled = true;
}
target.DropDownItems.Add(grp.Header, null, (e, obj) =>
{
this.ContextMenuStrip.Hide();
this.EnsureVisible(last);
this.EnsureVisible(index);
});
}
}
