public bool SelectPreviousFromKey()
{
List <MultiSelectTreeViewItem> items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
MultiSelectTreeViewItem item = treeView.GetPreviousItem(GetFocusedItem(), items);
return(SelectFromKey(item));
}
public bool SelectLastFromKey()
{
List <MultiSelectTreeViewItem> items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
MultiSelectTreeViewItem item = treeView.GetLastItem(items);
return(SelectFromKey(item));
}
public BorderSelectionLogic(MultiSelectTreeView treeView, Border selectionBorder, ScrollViewer scrollViewer, ItemsPresenter content, IEnumerable <MultiSelectTreeViewItem> items)
{
if (treeView == null)
{
throw new ArgumentNullException("treeView");
}
if (selectionBorder == null)
{
throw new ArgumentNullException("selectionBorder");
}
if (scrollViewer == null)
{
throw new ArgumentNullException("scrollViewer");
}
if (content == null)
{
throw new ArgumentNullException("content");
}
if (items == null)
{
throw new ArgumentNullException("items");
}
this.treeView = treeView;
this.border = selectionBorder;
this.scrollViewer = scrollViewer;
this.content = content;
this.items = items;
treeView.MouseDown += OnMouseDown;
treeView.MouseMove += OnMouseMove;
treeView.MouseUp += OnMouseUp;
treeView.KeyDown += OnKeyDown;
treeView.KeyUp += OnKeyUp;
}
public BorderSelectionLogic(MultiSelectTreeView treeView, Border selectionBorder, ScrollViewer scrollViewer, ItemsPresenter content, IEnumerable<MultiSelectTreeViewItem> items)
{
if (treeView == null)
{
throw new ArgumentNullException("treeView");
}
if (selectionBorder == null)
{
throw new ArgumentNullException("selectionBorder");
}
if (scrollViewer == null)
{
throw new ArgumentNullException("scrollViewer");
}
if (content == null)
{
throw new ArgumentNullException("content");
}
if (items == null)
{
throw new ArgumentNullException("items");
}
this.treeView = treeView;
this.border = selectionBorder;
this.scrollViewer = scrollViewer;
this.content = content;
this.items = items;
treeView.MouseDown += OnMouseDown;
treeView.MouseMove += OnMouseMove;
treeView.MouseUp += OnMouseUp;
treeView.KeyDown += OnKeyDown;
treeView.KeyUp += OnKeyUp;
}
private static void OnSelectionModeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
MultiSelectTreeView treeView = (MultiSelectTreeView)d;
if (treeView.Selection != null)
{
treeView.Selection.PreviewSelectionChanged -= treeView.PreviewSelectionChangedHandler;
}
switch ((TreeViewSelectionMode)e.NewValue)
{
case TreeViewSelectionMode.MultiSelectEnabled:
treeView.Selection = new SelectionMultiple(treeView);
break;
case TreeViewSelectionMode.SingleSelectOnly:
treeView.Selection = new SelectionSingle(treeView);
break;
}
if (treeView.Selection != null)
{
treeView.Selection.PreviewSelectionChanged += treeView.PreviewSelectionChangedHandler;
}
}
public void ApplyTemplate()
{
borderSelectionLogic = new BorderSelectionLogic(
treeView,
treeView.Template.FindName("selectionBorder", treeView) as Border,
treeView.Template.FindName("scrollViewer", treeView) as ScrollViewer,
treeView.Template.FindName("content", treeView) as ItemsPresenter,
MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false));
}
private MultiSelectTreeViewItem GetFocusedItem()
{
foreach (var item in MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false))
{
if (item.IsFocused)
{
return(item);
}
}
return(null);
}
public void Dispose()
{
if (treeView != null)
{
treeView.MouseDown -= OnMouseDown;
treeView.MouseMove -= OnMouseMove;
treeView.MouseUp -= OnMouseUp;
treeView.KeyDown -= OnKeyDown;
treeView.KeyUp -= OnKeyUp;
treeView = null;
}
GC.SuppressFinalize(this);
}
public void Dispose()
{
if (treeView != null)
{
treeView.MouseDown -= OnMouseDown;
treeView.MouseMove -= OnMouseMove;
treeView.MouseUp -= OnMouseUp;
treeView.KeyDown -= OnKeyDown;
treeView.KeyUp -= OnKeyUp;
treeView = null;
}
GC.SuppressFinalize(this);
}
private bool SelectPageUpDown(bool down)
{
List <MultiSelectTreeViewItem> items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
MultiSelectTreeViewItem item = GetFocusedItem();
if (item == null)
{
return(down ? SelectLastFromKey() : SelectFirstFromKey());
}
double targetY = item.TransformToAncestor(treeView).Transform(new Point()).Y;
FrameworkElement itemContent = (FrameworkElement)item.Template.FindName("PART_Header", item);
if (itemContent == null)
{
return(down ? SelectLastFromKey() : SelectFirstFromKey());
}
double offset = treeView.ActualHeight - 2 * ((FrameworkElement)itemContent.Parent).ActualHeight;
if (!down)
{
offset = -offset;
}
targetY += offset;
while (true)
{
var newItem = down ? treeView.GetNextItem(item, items) : treeView.GetPreviousItem(item, items);
if (newItem == null)
{
break;
}
item = newItem;
double itemY = item.TransformToAncestor(treeView).Transform(new Point()).Y;
if (down && itemY > targetY ||
!down && itemY < targetY)
{
break;
}
}
return(SelectFromKey(item));
}
public bool SelectAllFromKey()
{
var items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
// Add new selected items
foreach (var item in items.Where(i => !treeView.SelectedItems.Contains(i.DataContext)))
{
var e = new PreviewSelectionChangedEventArgs(true, item.DataContext);
OnPreviewSelectionChanged(e);
if (e.CancelAll)
{
return(false);
}
if (!e.CancelThis)
{
treeView.SelectedItems.Add(item.DataContext);
}
}
return(true);
}
private static void OnSelectedItemsPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
MultiSelectTreeView treeView = (MultiSelectTreeView) d;
if (e.OldValue != null)
{
INotifyCollectionChanged collection = e.OldValue as INotifyCollectionChanged;
if (collection != null)
{
collection.CollectionChanged -= treeView.OnSelectedItemsChanged;
}
}
if (e.NewValue != null)
{
INotifyCollectionChanged collection = e.NewValue as INotifyCollectionChanged;
if (collection != null)
{
collection.CollectionChanged += treeView.OnSelectedItemsChanged;
}
}
}
protected override void OnItemsSourceChanged(IEnumerable oldValue, IEnumerable newValue)
{
// Remove all items from the SelectedItems list that are no longer in the Items
if (oldValue != null)
{
MultiSelectTreeView parentTV = ParentTreeView;
if (parentTV == null)
{
parentTV = lastParentTreeView;
}
if (parentTV != null)
{
foreach (var item in oldValue)
{
parentTV.SelectedItems.Remove(item);
if (parentTV.Selection is SelectionMultiple multiselection)
{
multiselection.InvalidateLastShiftRoot(item);
}
}
}
}
}
public static void Focus(MultiSelectTreeView element)
{
//System.Diagnostics.Debug.WriteLine("Focus Tree with helper");
FocusCore(element);
element.BringIntoView();
}
public SelectionMultiple(MultiSelectTreeView treeView)
{
this.treeView = treeView;
}
public SelectionMultiple(MultiSelectTreeView treeView)
{
this.treeView = treeView;
}
public static void Focus(MultiSelectTreeView element)
{
//System.Diagnostics.Debug.WriteLine("Focus Tree with helper");
FocusCore(element);
element.BringIntoView();
}
public MultiSelectTreeViewAutomationPeer(MultiSelectTreeView owner)
: base(owner)
{
}
