private bool AddToSelectedElements(MultiSelectTreeViewItem treeViewItem, object item)
{
var index = _selectedElements.FindIndex(p => p.Container == treeViewItem);
if (index < 0)
{
if (!treeViewItem.IsSelected)
{
treeViewItem.IsSelected = true;
}
_selectedElements.Add(new ContainerItemPair(treeViewItem, item));
return(true);
}
return(false);
}
private void FindLastVisibleTreeViewItem(MultiSelectTreeViewItem parentTreeViewItem, ref MultiSelectTreeViewItem resultTreeViewItem)
{
if (!parentTreeViewItem.IsVisible)
{
return;
}
if (!parentTreeViewItem.HasItems)
{
resultTreeViewItem = parentTreeViewItem;
return;
}
FindLastVisibleTreeViewItem(
parentTreeViewItem.ItemContainerGenerator.ContainerFromIndex(parentTreeViewItem.Items.Count - 1) as MultiSelectTreeViewItem,
ref resultTreeViewItem);
}
public void ScrollToEnd()
{
if (!HasItems)
{
return;
}
MultiSelectTreeViewItem resultTreeViewItem = null;
FindLastVisibleTreeViewItem(
ItemContainerGenerator.ContainerFromIndex(Items.Count - 1) as MultiSelectTreeViewItem,
ref resultTreeViewItem);
if (resultTreeViewItem != null)
{
resultTreeViewItem.BringIntoView();
}
}
internal void RemoveSelectedElement(MultiSelectTreeViewItem treeViewItem, object item, bool walkIntoSubtree)
{
bool flag = false;
ForearchTreeViewItem(treeViewItem, item, walkIntoSubtree,
(container, _) =>
{
if (RemoveFromSelectedElements(container))
{
flag = true;
}
});
if (flag)
{
SetSelectedItems();
}
}
private bool RemoveFromSelectedElements(MultiSelectTreeViewItem treeViewItem)
{
var index = _selectedElements.FindIndex(p => p.Container == treeViewItem);
if (index >= 0)
{
_selectedElements.RemoveAt(index);
if (treeViewItem.IsSelected)
{
treeViewItem.IsSelected = false;
}
return(true);
}
return(false);
}
public void UnselectAll()
{
if (_selectedElements.Count > 0)
{
IsChangingSelection = true;
_selectedElements.ForEach(pair =>
{
pair.Container.IsSelected = false;
});
_selectedElements.Clear();
SetSelectedItems();
_latestSelectedContainer = null;
IsChangingSelection = false;
}
}
private static MultiSelectTreeViewItem FindLastFocusableItem(MultiSelectTreeViewItem item)
{
MultiSelectTreeViewItem treeViewItem = null;
int count = -1;
MultiSelectTreeViewItem treeViewItem1 = null;
while (item != null)
{
if (!item.IsEnabled || !item.IsVisible)
{
if (count <= 0)
{
break;
}
count--;
}
else
{
if (!item.IsExpanded || !item.CanExpand)
{
return(item);
}
treeViewItem = item;
treeViewItem1 = item;
count = item.Items.Count - 1;
}
item = treeViewItem1.ItemContainerGenerator.ContainerFromIndex(count) as MultiSelectTreeViewItem;
}
if (treeViewItem != null)
{
return(treeViewItem);
}
return(null);
}
internal void ChangeSelection(object data, MultiSelectTreeViewItem container, bool selected, SelectionMode selectionMode)
{
IsChangingSelection = true;
bool flag = false;
var mode = SelectionMode == SelectionMode.Multiple ? SelectionMode.Multiple : (SelectionMode)Math.Min((int)SelectionMode, (int)selectionMode);
if (selected)
{
if (mode == SelectionMode.Single)
{
_selectedElements.ForEach(p => p.Container.IsSelected = false);
_selectedElements.Clear();
}
if (mode == SelectionMode.Extended)
{
SelectRange(_latestSelectedContainer, container);
flag = true;
}
else
{
var pair = _selectedElements.FirstOrDefault(p => p.Container == container);
if (pair == null)
{
if (!container.IsSelected)
{
container.IsSelected = true;
}
_selectedElements.Add(new ContainerItemPair(container, data));
flag = true;
}
else if (pair.Item != data)
{
pair.Item = data;
flag = true;
}
}
}
else
{
if (RemoveFromSelectedElements(container))
{
flag = true;
}
}
if (flag)
{
if (selected && mode != SelectionMode.Extended)
{
_latestSelectedContainer = (_selectedElements == null || _selectedElements.Count == 0) ? null : _selectedElements.Last().Container;
}
if (!selected)
{
_latestSelectedContainer = container;
}
SetSelectedItems();
}
IsChangingSelection = false;
}
public ContainerItemPair(MultiSelectTreeViewItem container, object item)
{
Container = container;
Item = item;
}