/// <devdoc> this takes a native menu and builds up a managed toolstrip around it.
/// Scenario: showing the items from the SystemMenu.
/// targetWindow is the window to send WM_COMMAND, WM_SYSCOMMAND to
/// hmenu is a handle to the native menu
///
///
internal static ToolStripDropDownMenu FromHMenu(IntPtr hmenu, IWin32Window targetWindow)
{
ToolStripDropDownMenu managedDropDown = new ToolStripDropDownMenu();
managedDropDown.SuspendLayout();
HandleRef menuHandle = new HandleRef(null, hmenu);
int count = UnsafeNativeMethods.GetMenuItemCount(menuHandle);
ToolStripItem itemToAdd;
// surf through the items in the collection, building up TSMenuItems and TSSeparators
// corresponding to the native menu.
for (int i = 0; i < count; i++)
{
// peek at the i'th item.
NativeMethods.MENUITEMINFO_T_RW info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf <NativeMethods.MENUITEMINFO_T_RW>();
info.fMask = NativeMethods.MIIM_FTYPE;
info.fType = NativeMethods.MIIM_FTYPE;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
if (info.fType == NativeMethods.MFT_SEPARATOR)
{
// its a separator.
itemToAdd = new ToolStripSeparator();
}
else
{
// its a menu item... lets fish out the command id
info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf <NativeMethods.MENUITEMINFO_T_RW>();
info.fMask = NativeMethods.MIIM_ID;
info.fType = NativeMethods.MIIM_ID;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
// create the managed object - toolstripmenu item knows how to grok hmenu for information.
itemToAdd = new ToolStripMenuItem(hmenu, info.wID, targetWindow);
// if there is a submenu fetch it.
info = new NativeMethods.MENUITEMINFO_T_RW();
info.cbSize = Marshal.SizeOf <NativeMethods.MENUITEMINFO_T_RW>();
info.fMask = NativeMethods.MIIM_SUBMENU;
info.fType = NativeMethods.MIIM_SUBMENU;
UnsafeNativeMethods.GetMenuItemInfo(menuHandle, i, /*fByPosition=*/ true, info);
if (info.hSubMenu != IntPtr.Zero)
{
// set the dropdown to be the items from the submenu
((ToolStripMenuItem)itemToAdd).DropDown = FromHMenu(info.hSubMenu, targetWindow);
}
}
managedDropDown.Items.Add(itemToAdd);
}
managedDropDown.ResumeLayout();
return(managedDropDown);
}
