[Mono-list] Right aligned popup menu

Daniel Hughes trampster at gmail.com
Sun May 22 05:05:07 EDT 2011

I have a button on the far right of an application. When clicked I want to
show a menu underneath the button but right aligned with it. (think google
chrome menu).

This is what I have so far:

protected virtual void HandleMenuClicked (object sender, System.EventArgs e)
    Menu menu = new Menu();
    menu.Add(new MenuItem("About"));

private void MenuPosition(Menu menu, out int x, out int y, out bool pushIn)
    _menuButton.ParentWindow.GetOrigin(out x, out y);
    int menuWidth = 75; //need to look up actual width.
    x += _menuButton.Allocation.X - menuWidth;
    y += _menuButton.Allocation.Y + _menuButton.Allocation.Height;
   pushIn = true;

The problem with this is that I have hard coded the width of the menu. If a
longer menu entry was added, the font changed or theme changed then the
alignment will be wrong.

I tried looking up the width of the menu as follows:

int menuWidth = menu.Allocation.Width

This does not work as the menu has not been drawn yet and so the allocation
width is 1.

Any help will be greatly appreciated.
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