private void FilterMenuItem_Click(object sender, EventArgs e)
{
ToolStripCheckBoxMenuItem menuItem = (ToolStripCheckBoxMenuItem)sender;
IEnumerable <ListViewItem> items = null;
foreach (var filterOption in _filterMenus)
{
var selectedFiltersForThisColumn = filterOption.Value.Items.Cast <ToolStripCheckBoxMenuItem>().Where(item => item.Checked).Select(item => item.Tag).ToArray();
if (selectedFiltersForThisColumn.Length == 0)
{
//this.Columns[fitlerOption.Key].ImageIndex = -1;
//SetImageOnColumnHeader(filterOption.Key, false);
//UpdateColumnImage(filterOption.Key, false);
continue;
}
//this.Columns[fitlerOption.Key].ImageIndex = 0;
//SetImageOnColumnHeader(filterOption.Key, true);
//UpdateColumnImage(filterOption.Key, true);
if (items == null)
{
items = _originalItems.Where(item => Array.IndexOf(selectedFiltersForThisColumn, item.SubItems[filterOption.Key].Text) >= 0);
}
else
{
items = items.Where(item => Array.IndexOf(selectedFiltersForThisColumn, item.SubItems[filterOption.Key].Text) >= 0);
}
}
this.SuspendLayout();
try
{
this.Items.Clear();
this.Items.AddRange((items == null) ? _originalItems.ToArray() : items.ToArray());
}
finally
{
this.ResumeLayout();
}
}
private void BuildFilterMenu()
{
foreach (int columnIndex in _filterMenus.Keys.ToList())
{
ContextMenuStrip filterMenu = new ContextMenuStrip();
var distinctValues = _originalItems
.Select(item => item.SubItems[columnIndex].Text)
.Distinct();
foreach (var item in distinctValues)
{
ToolStripCheckBoxMenuItem newItem = new ToolStripCheckBoxMenuItem(String.IsNullOrEmpty(item) ? "(blank)" : item);
newItem.Tag = item;
newItem.Click += FilterMenuItem_Click;
filterMenu.Items.Add(newItem);
}
filterMenu.Closing += FitlerMenu_Closing;
_filterMenus[columnIndex] = filterMenu;
}
}