private void UpdateMultipleSelection(TreeNodeSelectionState state)
{
// Uno specific - in case the OnApplyTemplate was not yet called
// the multiselect checkbox is not yet set - we must cache the selection and call this again
if (m_selectionBox == null)
{
return;
}
switch (state)
{
case TreeNodeSelectionState.Selected:
m_selectionBox.IsChecked = true;
break;
case TreeNodeSelectionState.PartialSelected:
m_selectionBox.IsChecked = null;
break;
case TreeNodeSelectionState.UnSelected:
m_selectionBox.IsChecked = false;
break;
}
UpdateTreeViewItemVisualState(state);
}
internal void UpdateSelectionVisual(TreeNodeSelectionState state)
{
var treeView = AncestorTreeView;
if (treeView != null)
{
var listControl = treeView.ListControl;
if (listControl.IsMultiselect)
{
UpdateMultipleSelection(state);
}
else
{
var node = TreeNode;
if (node != null)
{
var viewModel = listControl.ListViewModel;
var isNodeSelected = viewModel.IsNodeSelected(node);
if (isNodeSelected != IsSelected)
{
IsSelected = isNodeSelected;
}
}
}
}
}
private void UpdateTreeViewItemVisualState(TreeNodeSelectionState state)
{
if (state == TreeNodeSelectionState.Selected)
{
VisualStateManager.GoToState(this, "TreeViewMultiSelectEnabledSelected", false);
}
else
{
VisualStateManager.GoToState(this, "TreeViewMultiSelectEnabledUnselected", false);
}
}
private void UpdateSelection(TreeViewNode node, TreeNodeSelectionState state)
{
if (node.SelectionState != state)
{
var viewModel = m_viewModel;
if (viewModel != null)
{
viewModel.UpdateSelection(node, state);
viewModel.NotifyContainerOfSelectionChange(node, state);
}
}
}
internal void SelectByIndex(int index, TreeNodeSelectionState state)
{
try
{
BeginSelectionChanges();
var targetNode = GetNodeAt(index);
UpdateSelection(targetNode, state);
}
finally
{
EndSelectionChanges();
}
}
