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POHow to toggle a ContextMenuStrip display using a button click but also allowing it to close normally (menu item clicks, lost focus etc)
 

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  1. POHow to toggle a ContextMenuStrip display using a button click but also allowing it to close normally (menu item clicks, lost focus etc)
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    <p>I created a simple UserControl consisting of a Label and ContextMenuStrip. I made it function like a ComboBox but instead of a dropdown I'm displaying a ContextMenuStrip. </p> <p>I have it working but there's some trickiness that I can't figure out. </p> <p>I'm trying to make the label ComboButton work the same way a ComboBox does. Click the button, the dropdown appears. Click the button a second time and it'll retract. The problem is, the ContextMenu disappears on any mouse click. So when I click the button a second time to retract the menu, the menu disappears first, and then the click event fires, displaying the menu again.</p> <p>I still want the Menu to disappear when a user selects a menuitem and when they just click anywhere on the form like a normal context menu does.</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; using System.Drawing.Drawing2D; using System.Windows.Forms.VisualStyles; using System.Diagnostics; namespace Controls { public partial class CMenu : UserControl { ButtonState _buttonState = ButtonState.Normal; public CMenu() { InitializeComponent(); } private void lblSelect_Paint(object sender, PaintEventArgs e) { base.OnPaint(e); ControlPaint.DrawComboButton(e.Graphics, getLabelRect(), _buttonState); } private bool IsDropdownHit(MouseEventArgs e) { Rectangle cursor = new Rectangle(e.X, e.Y, 1, 1); if (e.Button == MouseButtons.Left &amp;&amp; cursor.IntersectsWith(getLabelRect())) { return true; } return false; } private void lblSelect_MouseUp(object sender, MouseEventArgs e) { if (!IsDropdownHit(e)) return; if (!cmsItems.Visible) lblSelect.ContextMenuStrip = cmsItems; cmsItems.Width = lblSelect.Width; cmsItems.Show(lblSelect, 0, lblSelect.Height); } private Rectangle getLabelRect() { return new Rectangle(lblSelect.Width - 20, 0, 20, lblSelect.Height); } } } </code></pre>
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