private void MultiSelector_CollectSingle(ExplorerViewItem sender)
{
SelectedViewItems.ForEach(item => item.IsSelected = false);
SelectedViewItems.Clear();
sender.IsSelected = true;
LastSelectedItem = sender;
}
private List <ExplorerViewItem> MultiSelector_GetListInRange(ExplorerViewItem start, ExplorerViewItem end)
{
var items = MultiSelector_GetList(this, false);
var startIndex = items.IndexOf(start);
var endIndex = items.IndexOf(end);
var rangeStart = startIndex > endIndex || startIndex == -1 ? endIndex : startIndex;
var rangeCount = startIndex > endIndex ? startIndex - endIndex + 1 : endIndex - startIndex + 1;
if (startIndex == -1 && endIndex == -1)
{
rangeCount = 0;
}
else if (startIndex == -1 || endIndex == -1)
{
rangeCount = 1;
}
var res = rangeCount > 0 ? items.GetRange(rangeStart, rangeCount) : new List <ExplorerViewItem>();
if (startIndex > endIndex)
{
res.Reverse();
}
return(res);
}
public void ExplorerView_ChangeSelectedItem(ExplorerViewItem sender)
{
if (Mouse.LeftButton == MouseButtonState.Released && Mouse.RightButton == MouseButtonState.Pressed)
{
if (IsShiftPressed == false && IsCtrlPressed == false)
{
MultiSelector_CollectSingle(sender);
}
}
else if (IsShiftPressed == true && AllowMultiSelect == true)
{
MultiSelector_CollectRange(sender);
}
else if (IsCtrlPressed == true && AllowMultiSelect == true)
{
sender.IsSelected = !sender.IsSelected;
LastSelectedItem = sender;
}
else
{
MultiSelector_CollectSingle(sender);
}
if (SelectedViewItems.Contains(sender) == true)
{
if (sender.IsSelected == false)
{
SelectedViewItems.Remove(sender);
}
}
else
{
SelectedViewItems.Add(sender);
}
SelectedItems.Clear();
SelectedViewItems.ForEach(item => SelectedItems.Add(item.DataContext));
}
private void MultiSelector_CollectRange(ExplorerViewItem target)
{
if (LastSelectedItem == null)
{
return;
}
var collectedItems = MultiSelector_GetListInRange(LastSelectedItem, target);
if (IsCtrlPressed == true)
{
collectedItems.ForEach(c => SelectedViewItems.Remove(c));
}
else
{
SelectedViewItems.ForEach(s => s.IsSelected = false);
SelectedViewItems.Clear();
}
foreach (var c in collectedItems)
{
c.IsSelected = true;
SelectedViewItems.Add(c);
}
}