C# – Find parent control of ToolStripMenuItem

cc#-4.0winforms

I have a ContextMenuStrip that I attach to several controls. It has the items { Add, Remove, Edit }. When a user right clicks on one of my listbox controls (which pops up this context menu) and selects 'Add', how can I derive the listbox control from the ToolStripMenuItem reference that is passed in?

    private void OnAddEntry(object sender, EventArgs e)
    {
        // Example: ?????
        ListBox lb = sender.Parent;
    }

Best Answer

Mark, try this:

((ContextMenuStrip)(((ToolStripMenuItem)sender).Owner)).SourceControl

Related Solutions

C# – How to show a Context Menu when you right click a Menu Item

Edit, due to a comment:

In:

protected override void OnClick(EventArgs e)
{
    if (SecondaryContextMenu == null || MouseButtons != MouseButtons.Right)
    {
        base.OnClick(e);
    }
}

this part

 MouseButtons != MouseButtons.Right

should and does compile as it is a call to Control.MouseButtons. Since the Form inherits Control class, it is sufficient to call MouseButtons property directly.

Hope this helps:

public partial class Form1 : Form
{
    class CustomToolStripMenuItem : ToolStripMenuItem
    {
        private ContextMenuStrip secondaryContextMenu;

        public ContextMenuStrip SecondaryContextMenu
        {
            get
            {
                return secondaryContextMenu;
            }
            set
            {
                secondaryContextMenu = value;
            }
        }

        public CustomToolStripMenuItem(string text)
            : base(text)
        { }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (secondaryContextMenu != null)
                {
                    secondaryContextMenu.Dispose();
                    secondaryContextMenu = null;
                }
            }

            base.Dispose(disposing);
        }

        protected override void OnClick(EventArgs e)
        {
            if (SecondaryContextMenu == null || MouseButtons != MouseButtons.Right)
            {
                base.OnClick(e);
            }
        }
    }

    class CustomContextMenuStrip : ContextMenuStrip
    {
        private bool secondaryContextMenuActive = false;
        private ContextMenuStrip lastShownSecondaryContextMenu = null;

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (lastShownSecondaryContextMenu != null)
                {
                    lastShownSecondaryContextMenu.Close();
                    lastShownSecondaryContextMenu = null;
                }
            }
            base.Dispose(disposing);
        }

        protected override void OnControlAdded(ControlEventArgs e)
        {
            e.Control.MouseClick += new MouseEventHandler(Control_MouseClick);
            base.OnControlAdded(e);
        }

        protected override void OnControlRemoved(ControlEventArgs e)
        {
            e.Control.MouseClick -= new MouseEventHandler(Control_MouseClick);
            base.OnControlRemoved(e);
        }

        private void Control_MouseClick(object sender, MouseEventArgs e)
        {
            ShowSecondaryContextMenu(e);
        }

        protected override void OnMouseClick(MouseEventArgs e)
        {
            ShowSecondaryContextMenu(e);
            base.OnMouseClick(e);
        }

        private bool ShowSecondaryContextMenu(MouseEventArgs e)
        {
            CustomToolStripMenuItem ctsm = this.GetItemAt(e.Location) as CustomToolStripMenuItem;

            if (ctsm == null || ctsm.SecondaryContextMenu == null || e.Button != MouseButtons.Right)
            {
                return false;
            }

            lastShownSecondaryContextMenu = ctsm.SecondaryContextMenu;
            secondaryContextMenuActive = true;
            ctsm.SecondaryContextMenu.Closed += new ToolStripDropDownClosedEventHandler(SecondaryContextMenu_Closed);
            ctsm.SecondaryContextMenu.Show(Cursor.Position);
            return true;
        }

        void SecondaryContextMenu_Closed(object sender, ToolStripDropDownClosedEventArgs e)
        {
            ((ContextMenuStrip)sender).Closed -= new ToolStripDropDownClosedEventHandler(SecondaryContextMenu_Closed);
            lastShownSecondaryContextMenu = null;
            secondaryContextMenuActive = false;
            Focus();
        }

        protected override void OnClosing(ToolStripDropDownClosingEventArgs e)
        {
            if (secondaryContextMenuActive)
            {
                e.Cancel = true;
            }

            base.OnClosing(e);
        }
    }

    public Form1()
    {
        InitializeComponent();


        CustomToolStripMenuItem itemPrimary1 = new CustomToolStripMenuItem("item primary 1");
        itemPrimary1.SecondaryContextMenu = new ContextMenuStrip();
        itemPrimary1.SecondaryContextMenu.Items.AddRange(new ToolStripMenuItem[] { 
            new ToolStripMenuItem("item primary 1.1"),
            new ToolStripMenuItem("item primary 1.2"),
        });

        CustomToolStripMenuItem itemPrimary2 = new CustomToolStripMenuItem("item primary 2");
        itemPrimary2.DropDownItems.Add("item primary 2, sub 1");
        itemPrimary2.DropDownItems.Add("item primary 2, sub 2");
        itemPrimary2.SecondaryContextMenu = new ContextMenuStrip();
        itemPrimary2.SecondaryContextMenu.Items.AddRange(new ToolStripMenuItem[] { 
            new ToolStripMenuItem("item primary 2.1"),
            new ToolStripMenuItem("item primary 2.2"),
        });

        CustomContextMenuStrip primaryContextMenu = new CustomContextMenuStrip();
        primaryContextMenu.Items.AddRange(new ToolStripItem[]{
            itemPrimary1,
            itemPrimary2
        });

        this.ContextMenuStrip = primaryContextMenu;
    }
}

C# – Can’t find context menu in control collection

As you correctly observed, myContextMenu is not added to the Controls connection. Control has ContextMenuStrip property which you should check.

public void FindContextMenuStrip(Control input)
{
    foreach(Control control in input.Controls)
    {
        if(control.ContextMenuStrip != null)
            DoSomethingWithContextMenuStrip(control.ContextMenuStrip)

        if(control.Controls.Count > 0)
            FindContextMenuStrip(control);
    }
}

Put relevant code in DoSomethingWithContextMenuStrip method.

EDIT:

I saw your comment where you specified what you wanted to do with ContextMenuStrip.

How about creating a method in Base class which takes user details and creates a context menu strip?

public ContextMenuStrip GetContextMenuStripForUser(User user)
{
   //code to create context menu strip, with only those items enabled for which user has access.
}

In your final form, use this method to get ContextMenuStrip.

Best Answer

Related Solutions

C# – How to show a Context Menu when you right click a Menu Item

C# – Can’t find context menu in control collection

Related Topic