private void TheTreeView_PreviewSelectionChanged(object sender, PreviewSelectionChangedEventArgs e)
{
if (LockSelectionCheck.IsChecked == true)
{
// The current selection is locked by user request (Lock CheckBox is checked).
// Don't allow any changes to the selection at all.
e.CancelThis = true;
}
else
{
// Selection is not locked, apply other conditions.
// Require all selected items to be of the same type. If an item of another data
// type is already selected, don't include this new item in the selection.
if (e.Selecting && TheTreeView.SelectedItems.Count > 0)
{
e.CancelThis = e.Item.GetType() != TheTreeView.SelectedItems[0].GetType();
}
}
//if (e.Selecting)
//{
// System.Diagnostics.Debug.WriteLine("Preview: Selecting " + e.Item + (e.Cancel ? " - cancelled" : ""));
//}
//else
//{
// System.Diagnostics.Debug.WriteLine("Preview: Deselecting " + e.Item + (e.Cancel ? " - cancelled" : ""));
//}
}
protected override void OnSelectionChanged(SelectionChangedEventArgs e)
{
base.OnSelectionChanged(e);
// déterminer si on doit annuler la sélection
PreviewSelectionChangedEventArgs eEventArgs = new PreviewSelectionChangedEventArgs(e.AddedItems, e.RemovedItems);
if (m_lLastSelectedIndex.HasValue)
{
if (PreviewSelectionChanged != null)
{
PreviewSelectionChanged(this, eEventArgs);
}
}
// annuler (ou pas) la sélection
if (eEventArgs.Cancel)
{
this.SelectedIndex = m_lLastSelectedIndex.Value;
}
else
{
m_lLastSelectedIndex = this.SelectedIndex;
}
}
protected override void OnSelectionChanged(SelectionChangedEventArgs e) {
base.OnSelectionChanged(e);
var eEventArgs = new PreviewSelectionChangedEventArgs(e.AddedItems, e.RemovedItems);
if (m_lLastSelectedIndex.HasValue)
PreviewSelectionChanged?.Invoke(this, eEventArgs);
if (eEventArgs.Cancel)
this.SelectedIndex = m_lLastSelectedIndex.Value;
else
m_lLastSelectedIndex = this.SelectedIndex;
}
private void MultiSelectTreeView_PreviewSelectionChanged(object sender, PreviewSelectionChangedEventArgs e)
{
// multiSelectTreeView.sele
var vm = (ExplorerTreeViewModel)this.DataContext;
}