public static void BindDataSource(this BetterListViewItem item, TaskListViewSourceItem source,
BetterListView owner)
{
item.Tag = source;
Refresh(item, owner);
item.Group = source.Group;
}
private static void Refresh(BetterListViewItem item, BetterListView owner)
{
TaskListViewSourceItem source = item.DataSource();
object dataObject = source.DataObject;
IEnumerable <BetterListViewColumnHeader> columns = owner.Columns;
Dictionary <string, PropertyInfo> props = GetDataObjectProps(dataObject);
int colCount = columns.Count(), subCount = item.SubItems.Count, subDiff = colCount - subCount;
if (subDiff > 0)
{
List <BetterListViewSubItem> subItems = new List <BetterListViewSubItem>(subDiff);
for (int i = 0; i < subDiff; i++)
{
subItems.Add(new BetterListViewSubItem());
}
item.SubItems.AddRange(subItems);
}
int idx = -1;
foreach (BetterListViewColumnHeader column in columns)
{
idx++;
if (column.DisplayMember == string.Empty ||
!props.TryGetValue(column.DisplayMember, out var propertyInfo))
{
continue;
}
BetterListViewSubItem subItem = item.SubItems[idx];
object displayValue = propertyInfo.GetValue(dataObject);
string displayString = displayValue?.ToString();
if (subItem.Text != displayString)
{
subItem.Text = displayString;
}
if (column.ValueMember != string.Empty &&
props.TryGetValue(column.ValueMember, out propertyInfo))
{
subItem.Key = (IComparable)propertyInfo.GetValue(dataObject);
}
else
{
subItem.Key = (IComparable)displayValue;
}
}
}
public void RebindItems()
{
BeginUpdate();
HashSet <object> setItems = _sourceItems != null
? new HashSet <object>(_sourceItems)
: new HashSet <object>();
BetterListViewItem[] toDelete = Items.
Where(i => !setItems.Contains(i.DataObject())).
ToArray();
foreach (BetterListViewItem item in toDelete)
{
Items.Remove(item);
}
BetterListViewItem[] toUpdate = Items.
Where(i => setItems.Contains(i.DataObject())).
ToArray();
foreach (BetterListViewItem item in toUpdate)
{
item.Refresh();
}
IEnumerable <object> toAdd = setItems.Except(Items.Select(i => i.DataObject()));
List <BetterListViewItem> itemsToAdd = new List <BetterListViewItem>();
foreach (object dataObject in toAdd)
{
BetterListViewItem item = new BetterListViewItem();
TaskListViewSourceItem source = new TaskListViewSourceItem(dataObject, _funcItemFindGroup);
item.BindDataSource(source, this);
itemsToAdd.Add(item);
}
Items.AddRange(itemsToAdd);
EndUpdate();
}
