public static void SetIsAltSelected(ExplorerTreeViewItem element, Boolean value, ExplorerTreeView treeView)
{
if (element == null)
{
return;
}
if (value)
{
//deselect previous selection
var selected = ExplorerTreeView.GetAltSelectedItem(treeView);
ExplorerTreeView.AltDeselectItem(treeView, element, element);
}
if (GetIsAltSelected(element) != value)
{
element.SetValue(IsAltSelectedProperty, value);
element.NotifyPropertyChanged("IsAltSelected");
}
object selectedobj = ExplorerTreeView.GetAltSelectedItem(treeView);
if (selectedobj != null && selectedobj.Equals(element.Header))
{
return;
}
ExplorerTreeView.SetAltSelectedItem(treeView, value ? element.Header : null);
}
public static void AltDeselectItem(ExplorerTreeView treeView, ExplorerTreeViewItem treeViewItem, ExplorerTreeViewItem skip)
{
if (treeView != null)
{
for (int i = 0; i < treeView.Items.Count; i++)
{
if (treeView.ItemContainerGenerator.ContainerFromIndex(i) is ExplorerTreeViewItem item)
{
if (item != skip)
{
ExplorerTreeViewItem.SetIsAltSelected(item, false, treeView);
}
AltDeselectItem(null, item, skip);
}
}
}
else
{
for (int i = 0; i < treeViewItem.Items.Count; i++)
{
if (treeViewItem.ItemContainerGenerator.ContainerFromIndex(i) is ExplorerTreeViewItem item)
{
if (item != skip)
{
ExplorerTreeViewItem.SetIsAltSelected(item, false, treeView);
}
AltDeselectItem(null, item, skip);
}
}
}
}
protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
{
base.OnPreviewMouseRightButtonDown(e);
var treeViewItem = FindTreeViewItem(e.OriginalSource as DependencyObject);
if (treeViewItem == _selectTreeViewItemOnMouseUp)
{
ExplorerTreeViewItem.SetIsAltSelected(treeViewItem, true, this);
}
}
protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
base.OnPreviewMouseLeftButtonDown(e);
var treeViewItem = FindTreeViewItem(e.OriginalSource as DependencyObject);
if (treeViewItem != null)
{
_selectTreeViewItemOnMouseUp = treeViewItem;
}
}
private static void OnAltSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var treeViewItem = d as ExplorerTreeViewItem;
var treeView = FindTreeView(treeViewItem);
if (treeViewItem != null && treeView != null)
{
var selectedItem = GetAltSelectedItem(treeView);
if (selectedItem != null)
{
if (ExplorerTreeViewItem.GetIsAltSelected(treeViewItem))
{
SetAltSelectedItem(treeView, treeViewItem.Header);
}
else
{
SetAltSelectedItem(treeView, null);
}
}
}
}
protected override void OnGotFocus(RoutedEventArgs e)
{
base.OnGotFocus(e);
if (e.OriginalSource is ExplorerTreeView)
{
return;
}
var treeViewItem = FindTreeViewItem(e.OriginalSource as DependencyObject);
if (treeViewItem == null)
{
return;
}
if (Mouse.LeftButton == MouseButtonState.Pressed && ExplorerTreeViewItem.GetIsAltSelected(treeViewItem))
{
_selectTreeViewItemOnMouseUp = treeViewItem;
}
}
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
var ei = item as FSExplorerItem;
var rootcontrol = element;
FSExplorerTree tvRoot = null;
while (true)
{
if (!(rootcontrol is Visual || rootcontrol is Visual3D))
{
break;
}
if (rootcontrol is FSExplorerTree)
{
tvRoot = rootcontrol as FSExplorerTree;
break;
}
else
{
rootcontrol = VisualTreeHelper.GetParent(rootcontrol);
if (rootcontrol == null)
{
break;
}
continue;
}
}
ExplorerTreeViewItem tvi = element as ExplorerTreeViewItem;
if (tvRoot != null && tvRoot.ShowFiles == false && ei != null && !ei.IsDirectory)
{
tvi.Visibility = Visibility.Collapsed;
}
//else tvi.Visibility = ei.Visibility;
}
public static bool GetIsAltSelected(ExplorerTreeViewItem element)
{
return((bool)element.GetValue(IsAltSelectedProperty));
}
