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POBest way to hide a toolbox associated with a UserControl in .NET 2.0?
 

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  1. POBest way to hide a toolbox associated with a UserControl in .NET 2.0?
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    <p>I've recently come across the following situation. I have a <code>UserControl</code> that can show a modeless toolbox. If the user has shown the toolbox, I'd like to hide and show it appropriately as the <code>UserControl</code> itself becomes invisible or visible, respectively. The <code>UserControl</code> can be embedded in an arbitrary number of parent containers, such as a <code>GroupBox</code> or <code>TabPage</code>, which can influence whether or not the <code>UserControl</code> is actually visible despite its own <code>Visible</code> property being <code>True</code>.</p> <p>In WPF, it seems like I could use the <code>IsVisibleChanged</code> event of the <code>UserControl</code> to handle this. Is there an equivalent for WinForms? What would a general solution in .NET 2.0 be?</p> <p>EDIT: Here is the solution that I arrived at. Is there a better solution?</p> <pre><code>public partial class MyControl : UserControl { private List&lt;Control&gt; _ancestors = new List&lt;Control&gt;(); private bool _isVisible = false; public MyControl() { InitializeComponent(); ParentChanged += OnParentChanged; VisibleChanged += OnVisibleChanged; } private void OnParentChanged(object sender, EventArgs e) { foreach (Control c in _ancestors) { c.ParentChanged -= OnParentChanged; c.VisibleChanged -= OnVisibleChanged; } _ancestors.Clear(); for (Control ancestor = Parent; ancestor != null; ancestor = ancestor.Parent) { ancestor.ParentChanged += OnParentChanged; ancestor.VisibleChanged += OnVisibleChanged; _ancestors.Add(ancestor); } } private void OnVisibleChanged(object sender, EventArgs e) { bool isVisible = Visible; foreach (Control c in _ancestors) { if (!c.Visible) { isVisible = false; break; } } if (isVisible != _isVisible) { _isVisible = isVisible; // Control visibility has changed here // Do something } } } </code></pre>
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