internal static List <T> CollectCheckedObjects <T>(this FastObjectListView listView, ObjectListViewCollector returnIfNoneChecked = ObjectListViewCollector.All)
{
if (listView.Objects == null || listView.GetItemCount() == 0)
{
return(new List <T>());
}
List <T> list = new List <T>();
if (listView.CheckedObjects.Count > 0)
{
foreach (var ch in listView.CheckedObjects)
{
list.Add((T)ch);
}
}
else
{
switch (returnIfNoneChecked)
{
case ObjectListViewCollector.Empty: return(list);
case ObjectListViewCollector.Selected:
if (listView.SelectedObject != null)
{
list.Add((T)listView.SelectedObject);
}
break;
case ObjectListViewCollector.All:
foreach (var item in listView.Objects)
{
list.Add((T)item);
}
break;
}
}
return(list);
}
public static void UpdateFOLV(FastObjectListView olv, IList objs,
bool Follow = false,
ColumnHeaderAutoResizeStyle ResizeColsStyle = ColumnHeaderAutoResizeStyle.None,
bool FullRefresh = false,
bool UseSelected = false,
object SelectObject = null,
bool ForcedSelection = false,
[CallerMemberName()] string memberName = null)
{
Global_GUI.InvokeIFRequired(olv, () =>
{
try
{
int oldcnt = olv.Items.Count;
if (oldcnt == 0)
{
olv.EmptyListMsg = "Loading...";
}
//Debug.Print($"{DateTime.Now} - {memberName} > UpdateFOLV: {objs.Count} items, Follow={Follow}");
olv.Freeze(); //accessed from another thread
if (FullRefresh)
{
//olv.ClearCachedInfo();
//olv.ClearObjects();
}
if (FullRefresh || olv.Items.Count == 0) //full refresh of new objects
{
olv.SetObjects(objs, true);
}
else
{
olv.AddObjects(objs); //minimize list changes
}
if (olv.Items.Count > 0)
{
if (Follow)
{
if (SelectObject != null && UseSelected)
{
//use the given object as selected
olv.SelectedObject = SelectObject; //olv.Items.Count - 1;
}
else if (SelectObject == null && UseSelected && olv.IsFiltering && olv.GetItemCount() > 0)
{
//use the last filtered object as the selected object
olv.SelectedObject = olv.FilteredObjects.Cast <object>().Last();
}
else if (!olv.IsFiltering)
{
//just use the last object given to us
olv.SelectedObject = objs[objs.Count - 1]; //olv.Items.Count - 1;
}
if (olv.SelectedObject != null)
{
olv.EnsureModelVisible(olv.SelectedObject);
}
}
else
{
//only select something if nothing is already selected
if (SelectObject != null && (ForcedSelection || (UseSelected && olv.SelectedObject == null)))
{
//use the given object as selected
olv.SelectedObject = SelectObject; //olv.Items.Count - 1;
olv.EnsureModelVisible(olv.SelectedObject);
}
//else if (SelectObject == null && UseSelected && olv.IsFiltering && olv.GetItemCount() > 0)
//{
// //use the last filtered object as the selected object
// olv.SelectedObject = olv.FilteredObjects.Cast<object>().First();
//}
//else if (!olv.IsFiltering && UseSelected)
//{
// //just use the last object given to us
// olv.SelectedObject = objs[0]; //olv.Items.Count - 1;
//}
}
//update column size only if did not restore folv state file or forced
if (olv.Tag == null)
{
olv.AutoResizeColumns(ColumnHeaderAutoResizeStyle.ColumnContent);
olv.Tag = "resizedcols";
}
else if (ResizeColsStyle != ColumnHeaderAutoResizeStyle.None)
{
olv.AutoResizeColumns(ResizeColsStyle);
olv.Tag = "resizedcols";
}
}
else
{
olv.EmptyListMsg = "Empty";
}
}
catch (Exception ex)
{
Log("Error: " + ex.Msg());
}
finally
{
olv.Unfreeze();
if (FullRefresh)
{
olv.Refresh();
}
}
});
}