protected override DependencyObject GetContainerForItemOverride()
{
TreeListViewItem item = new TreeListViewItem();
item.GridViewColumns = GridViewColumns;
return(item);
}
private bool ExpandAndSelectItem(ItemsControl parentContainer, object itemToSelect)
{
foreach (Object item in parentContainer.Items)
{
count++;
TreeListViewItem currentContainer = parentContainer.ItemContainerGenerator.ContainerFromItem(item) as TreeListViewItem;
if (item == itemToSelect && currentContainer != null)
{
currentContainer.IsSelected = true;
currentContainer.BringIntoView();
currentContainer.Focus();
ScrollViewer viewer = VisualUpwardSearch <ScrollViewer>(currentContainer as DependencyObject) as ScrollViewer;
viewer.ScrollToVerticalOffset(count * 25);
return(true);
}
if (currentContainer != null && currentContainer.Items.Count > 0)
{
bool wasExpanded = currentContainer.IsExpanded;
currentContainer.IsExpanded = true;
currentContainer.UpdateLayout();
if (ExpandAndSelectItem(currentContainer, itemToSelect))
{
return(true);
}
else
{
currentContainer.IsExpanded = wasExpanded;
currentContainer.UpdateLayout();
}
}
}
return(false);
}
protected override void OnPreviewMouseRightButtonDown(MouseButtonEventArgs e)
{
TreeListViewItem tvitem = VisualUpwardSearch <TreeListViewItem>(e.OriginalSource as DependencyObject) as TreeListViewItem;
if (tvitem != null)
{
tvitem.Focus();
}
base.OnPreviewMouseRightButtonDown(e);
}
static TreeListView GetTree(TreeListViewItem item)
{
Func <DependencyObject, DependencyObject> getParent = (o) => VisualTreeHelper.GetParent(o);
FrameworkElement currentItem = item;
while (!(getParent(currentItem) is TreeListView))
{
currentItem = (FrameworkElement)getParent(currentItem);
}
return((TreeListView)getParent(currentItem));
}
private TreeListViewItem FindTreeViewItem(ItemsControl item, object data)
{
TreeListViewItem findItem = null;
bool itemIsExpand = false;
if (item is TreeListViewItem)
{
TreeListViewItem tviCurrent = item as TreeListViewItem;
object itemData = tviCurrent.DataContext;
if (itemData == data)
{
findItem = tviCurrent;
}
else
{
itemIsExpand = tviCurrent.IsExpanded;
if (!tviCurrent.IsExpanded)
{
tviCurrent.SetValue(TreeViewItem.IsExpandedProperty, true);
tviCurrent.UpdateLayout();
}
}
}
if (findItem == null)
{
for (int i = 0; i < item.Items.Count; i++)
{
TreeListViewItem tvItem = (TreeListViewItem)item.ItemContainerGenerator.ContainerFromIndex(i);
if (tvItem == null)
{
continue;
}
object itemData = item.Items[i];
if (itemData == data)
{
findItem = tvItem;
break;
}
else if (tvItem.Items.Count > 0)
{
findItem = FindTreeViewItem(tvItem, data);
if (findItem != null)
{
break;
}
}
}
TreeListViewItem tviCurrent = item as TreeListViewItem;
tviCurrent.SetValue(TreeListViewItem.IsExpandedProperty, itemIsExpand);
tviCurrent.UpdateLayout();
}
return(findItem);
}
public void SetScorllViewPosition(object item, object oneLevelTree = null)
{
if (item == null)
{
return;
}
TreeListViewItem container = null;
if (oneLevelTree == null)
{
foreach (var tree in this.Items)
{
TreeListViewItem tlvi = this.ItemContainerGenerator.ContainerFromItem(tree) as TreeListViewItem;
container = FindTreeViewItem(tlvi, item) as TreeListViewItem;
if (container != null)
{
break;
}
}
if (container == null)
{
return;
}
container.BringIntoView();
container.IsSelected = true;
}
else
{
TreeListViewItem tlvi = this.ItemContainerGenerator.ContainerFromItem(oneLevelTree) as TreeListViewItem;
if (item == oneLevelTree)
{
tlvi.IsSelected = true;
tlvi.BringIntoView();
tlvi.Focus();
}
else
{
tlvi.IsExpanded = true;
tlvi.UpdateLayout();
count = 0;
foreach (Object itemTree in this.Items)
{
count++;
if (itemTree == oneLevelTree)
{
break;
}
}
ExpandAndSelectItem(tlvi, item);
}
}
}
static void ItemClicked(object sender, MouseButtonEventArgs e)
{
TreeListViewItem item = FindTreeViewItem(e.OriginalSource);
if (item == null)
{
return;
}
TreeListView tree = (TreeListView)sender;
var mouseButton = e.ChangedButton;
if (mouseButton != MouseButton.Left)
{
if ((mouseButton == MouseButton.Right) && ((Keyboard.Modifiers & (ModifierKeys.Shift | ModifierKeys.Control)) == ModifierKeys.None))
{
if (GetIsSelected(item))
{
UpdateAnchorAndActionItem(tree, item);
return;
}
MakeSingleSelection(tree, item);
}
return;
}
if ((Keyboard.Modifiers & (ModifierKeys.Shift | ModifierKeys.Control)) != (ModifierKeys.Shift | ModifierKeys.Control))
{
if (GetIsSelected(item) && Keyboard.Modifiers != ModifierKeys.Shift && Keyboard.Modifiers != ModifierKeys.Control)
{
return;
}
else if (Keyboard.Modifiers != ModifierKeys.Shift && Keyboard.Modifiers != ModifierKeys.Control)
{
SelectedTreeItems.Clear();
}
if ((Keyboard.Modifiers & ModifierKeys.Control) == ModifierKeys.Control)
{
MakeToggleSelection(tree, item);
return;
}
if ((Keyboard.Modifiers & ModifierKeys.Shift) == ModifierKeys.Shift)
{
MakeAnchorSelection(tree, item, true);
return;
}
MakeSingleSelection(tree, item);
return;
}
}
private static void MakeAnchorSelection(TreeListView tree, TreeListViewItem actionItem, bool clearCurrent)
{
if (GetAnchorItem(tree) == null)
{
var selectedItems = GetSelectedTreeViewItems(tree);
if (selectedItems.Count > 0)
{
SetAnchorItem(tree, selectedItems[selectedItems.Count - 1]);
}
else
{
SetAnchorItem(tree, GetExpandedTreeViewItems(tree).Skip(3).FirstOrDefault());
}
if (GetAnchorItem(tree) == null)
{
return;
}
}
var anchor = GetAnchorItem(tree);
var items = GetExpandedTreeViewItems(tree);
bool betweenBoundary = false;
foreach (var item in items)
{
bool isBoundary = item == anchor || item == actionItem;
if (isBoundary)
{
betweenBoundary = !betweenBoundary;
}
if (betweenBoundary || isBoundary)
{
SetIsSelected(item, true);
}
else
{
if (clearCurrent)
{
SetIsSelected(item, false);
}
else
{
break;
}
}
}
}
public static void SetIsSelected(DependencyObject obj, bool value)
{
TreeListViewItem tlvi = obj as TreeListViewItem;
//if (IsKeyCtrl && tlvi.IsSelected)
//{
// return;
//}
if (value)
{
GradientStopCollection gradientStopCollection = new GradientStopCollection();
gradientStopCollection.Add(new GradientStop()
{
Color = (Color)ColorConverter.ConvertFromString("#FFC7DFFC"),
Offset = 1
});
gradientStopCollection.Add(new GradientStop()
{
Color = (Color)ColorConverter.ConvertFromString("#FF3832B8"),
Offset = 1
});
LinearGradientBrush brush = new LinearGradientBrush(gradientStopCollection, new Point(0.5, 0), new Point(0.5, 1));
tlvi.Background = brush;
if (SelectedTreeItems == null)
{
SelectedTreeItems = new List <object>();
}
if (!SelectedTreeItems.Contains(tlvi.DataContext))
{
SelectedTreeItems.Add(tlvi.DataContext);
}
}
else
{
tlvi.Background = Brushes.Transparent;
if (SelectedTreeItems != null)
{
if (SelectedTreeItems.Contains(tlvi.DataContext))
{
SelectedTreeItems.Remove(tlvi.DataContext);
}
}
}
obj.SetValue(IsSelectedProperty, value);
}
private static void MakeSingleSelection(TreeListView tree, TreeListViewItem item)
{
foreach (TreeListViewItem selectedItem in GetExpandedTreeViewItems(tree))
{
if (selectedItem == null)
{
continue;
}
if (selectedItem != item)
{
SetIsSelected(selectedItem, false);
}
else
{
SetIsSelected(selectedItem, true);
}
}
UpdateAnchorAndActionItem(tree, item);
}
protected override void OnExpanded(RoutedEventArgs e)
{
base.OnExpanded(e);
try
{
TreeListViewItem t = e.Source as TreeListViewItem;
if (t == null)
{
return;
}
ControlTemplate template = t.Template;
Storyboard show = template.Resources["STShow"] as Storyboard;
ItemsPresenter item = template.FindName("ItemsHost", t) as ItemsPresenter;
show.Begin(item);
}
catch (Exception ex)
{
//System.Windows.MessageBox.Show(ex.Message);
}
}
static void RealSelectedChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
{
TreeListViewItem item = (TreeListViewItem)sender;
var selectedItems = GetSelectedItems(GetTree(item));
if (selectedItems != null)
{
var isSelected = GetIsSelected(item);
if (isSelected)
{
try
{
selectedItems.Add(item.Header);
}
catch (ArgumentException)
{
}
}
else
{
selectedItems.Remove(item.Header);
}
}
}
private static void UpdateAnchorAndActionItem(TreeListView tree, TreeListViewItem item)
{
SetAnchorItem(tree, item);
}
private static void MakeToggleSelection(TreeListView tree, TreeListViewItem item)
{
SetIsSelected(item, !GetIsSelected(item));
UpdateAnchorAndActionItem(tree, item);
}