Checkable drop down menu

Hi,

To have only one menu item of a drop down menu checked, you can subscribe to the MouseDown event of the menu items collection and uncheck all but the clicked menu item in the event handler.

Here's how to create a simple drop down menu:

NMenuDropDown menu = new NMenuDropDown("Menu");
menu.Items.Add(new NCheckableMenuItem("Item 1"));
menu.Items.Add(new NCheckableMenuItem("Item 2"));
menu.Items.Add(new NCheckableMenuItem("Item 3"));
menu.Items.Add(new NCheckableMenuItem("Item 4"));
menu.Items.MouseDown += OnMenuItemsMouseDown;

Here's how to uncheck all but the clicked menu item in the event handler:

private void OnMenuItemsMouseDown(NMouseButtonEventArgs arg)
{
&nbsp;&nbsp;&nbsp; // Get the menu items and the clicked menu item
&nbsp;&nbsp;&nbsp; NMenuItemCollection menuItems = (NMenuItemCollection)arg.CurrentTargetNode;
&nbsp;&nbsp;&nbsp; NCheckableMenuItem clickedMenuItem = arg.TargetNode is NCheckableMenuItem ?
&nbsp;&nbsp;&nbsp; (NCheckableMenuItem)arg.TargetNode :
&nbsp;&nbsp;&nbsp; arg.TargetNode.GetFirstAncestor&lt;NCheckableMenuItem&gt;();

&nbsp;&nbsp;&nbsp; // Uncheck all but the clicked menu item
&nbsp;&nbsp;&nbsp; for (int i = 0; i &lt; menuItems.Count; i++)
&nbsp;&nbsp;&nbsp; {
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; NCheckableMenuItem currentItem = menuItems[i] as NCheckableMenuItem;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; if (currentItem != clickedMenuItem)
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; {
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; currentItem.Checked = false;
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; }
&nbsp;&nbsp;&nbsp; }
}

Best Regards,
Nevron Support Team

Author	Message
Jobelle Firme	Posted 5 Years Ago
Junior Member Group: Forum Members Last Active: 5 Years Ago Posts: 8, Visits: 65	Hi. How do you create a drop down menu with checkable items but only one item can be selected? Right now I have multiple items can be checked. Thanks!
	REPLY QUOTE
Nevron Support	Posted 5 Years Ago
Supreme Being Group: Forum Members Last Active: Last Month Posts: 3,055, Visits: 4,055	Hi, To have only one menu item of a drop down menu checked, you can subscribe to the MouseDown event of the menu items collection and uncheck all but the clicked menu item in the event handler. Here's how to create a simple drop down menu: NMenuDropDown menu = new NMenuDropDown("Menu"); menu.Items.Add(new NCheckableMenuItem("Item 1")); menu.Items.Add(new NCheckableMenuItem("Item 2")); menu.Items.Add(new NCheckableMenuItem("Item 3")); menu.Items.Add(new NCheckableMenuItem("Item 4")); menu.Items.MouseDown += OnMenuItemsMouseDown; `NMenuDropDown menu = new NMenuDropDown("Menu"); menu.Items.Add(new NCheckableMenuItem("Item 1")); menu.Items.Add(new NCheckableMenuItem("Item 2")); menu.Items.Add(new NCheckableMenuItem("Item 3")); menu.Items.Add(new NCheckableMenuItem("Item 4")); menu.Items.MouseDown += OnMenuItemsMouseDown;` Here's how to uncheck all but the clicked menu item in the event handler: private void OnMenuItemsMouseDown(NMouseButtonEventArgs arg) {     // Get the menu items and the clicked menu item     NMenuItemCollection menuItems = (NMenuItemCollection)arg.CurrentTargetNode;     NCheckableMenuItem clickedMenuItem = arg.TargetNode is NCheckableMenuItem ?     (NCheckableMenuItem)arg.TargetNode :     arg.TargetNode.GetFirstAncestor<NCheckableMenuItem>();     // Uncheck all but the clicked menu item     for (int i = 0; i < menuItems.Count; i++)     {         NCheckableMenuItem currentItem = menuItems[i] as NCheckableMenuItem;         if (currentItem != clickedMenuItem)         {             currentItem.Checked = false;         }     } } private void OnMenuItemsMouseDown(NMouseButtonEventArgs arg) {     // Get the menu items and the clicked menu item     NMenuItemCollection menuItems = (NMenuItemCollection)arg.CurrentTargetNode;     NCheckableMenuItem clickedMenuItem = arg.TargetNode is NCheckableMenuItem ?     (NCheckableMenuItem)arg.TargetNode :     arg.TargetNode.GetFirstAncestor<NCheckableMenuItem>();     // Uncheck all but the clicked menu item     for (int i = 0; i < menuItems.Count; i++)     {         NCheckableMenuItem currentItem = menuItems[i] as NCheckableMenuItem;         if (currentItem != clickedMenuItem)         {             currentItem.Checked = false;         }     } } Best Regards, Nevron Support Team
	REPLY QUOTE

Checkable drop down menu

Checkable drop down menu

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