WPF Double Click TreeviewItem Child Node

我的梦境 提交于 2019-12-05 02:41:19
<TreeView.ItemContainerStyle>
    <Style TargetType="{x:Type TreeViewItem}">
        <EventSetter Event="MouseDoubleClick" Handler="OnItemMouseDoubleClick" />
        ...
<TreeView.ItemContainerStyle>
    <Style TargetType="{x:Type TreeViewItem}">
        <EventSetter Event="MouseDoubleClick" Handler="OnItemMouseDoubleClick" />
        ...

And THEN, the handler has to be written as follows in order to prevent the double-click from firing on successive parent TreeViewItems:

   private void OnItemMouseDoubleClick(object sender, MouseButtonEventArgs args)
    {
        if (sender is TreeViewItem)
        {
            if (!((TreeViewItem)sender).IsSelected)
            {
                return;
            }
        }

        .... do stuff.

    }

Thanks to Aurelien Ribon for getting 90% of the way there. The double-click problem seems to be well-known in other postings on Stack Exchange. Just consolidating both solutions into one answer.

This is the only way I managed to get it to work for all the cases:

    void MyTreeView_PreviewMouseDoubleClick(object sender, MouseButtonEventArgs e)
    {
        var clickedItem = TryGetClickedItem(myTreeView, e);
        if (clickedItem == null)
            return;

        e.Handled = true; // to cancel expanded/collapsed toggle
        DoStuff(clickedItem);
    }

    TreeViewItem TryGetClickedItem(TreeView treeView, MouseButtonEventArgs e)
    {
        var hit = e.OriginalSource as DependencyObject;
        while (hit != null && !(hit is TreeViewItem))
            hit = VisualTreeHelper.GetParent(hit);

        return hit as TreeViewItem;
    }
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