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FixedListView.cs
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FixedListView.cs
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using System.Collections;
using System.Windows.Forms;
namespace CustomFormControl
{
public class FixedListView : ListView
{
private int _lastItemIndexClicked1 = -1;
private int _lastItemIndexClicked2 = -1;
private bool _shiftOn;
protected override void OnKeyDown(KeyEventArgs e)
{
_shiftOn = e.Shift;
base.OnKeyDown(e);
}
protected override void OnKeyUp(KeyEventArgs e)
{
_shiftOn = false;
base.OnKeyUp(e);
}
protected override void OnMouseDown(MouseEventArgs e)
{
ListViewItem it = GetItemAt(e.X, e.Y);
if (it == null)
{
//lastItemIndexClicked2 = -1;
}
else
{
_lastItemIndexClicked2 = it.Index;
}
if (!_shiftOn || (_lastItemIndexClicked1 < 0))
{
_lastItemIndexClicked1 = _lastItemIndexClicked2;
}
base.OnMouseDown(e);
}
protected override void OnVirtualItemsSelectionRangeChanged(
ListViewVirtualItemsSelectionRangeChangedEventArgs e)
{
try
{
int start = _lastItemIndexClicked1;
int end = _lastItemIndexClicked2;
if (end < start)
{
int temp = start;
start = end;
end = temp;
}
if ((start >= 0) && (end >= 0))
{
ArrayList toRemove = new ArrayList();
foreach (int index in SelectedIndices)
{
if ((index < start) || (index > end))
toRemove.Add(index);
}
if (toRemove.Count > 0)
{
foreach (int index in toRemove)
{
SelectedIndices.Remove(index);
}
}
}
ListViewVirtualItemsSelectionRangeChangedEventArgs te =
new ListViewVirtualItemsSelectionRangeChangedEventArgs(start, end, e.IsSelected);
base.OnVirtualItemsSelectionRangeChanged(te);
}
catch
{
}
}
}
}