public static extern bool TrackPopupMenuEx(HandleRef hmenu, int fuFlags, int x, int y, HandleRef hwnd, System.Windows.Forms.NativeMethods.TPMPARAMS tpm);
private void WmNotifyDropDown(ref Message m)
{
System.Windows.Forms.NativeMethods.NMTOOLBAR lParam = (System.Windows.Forms.NativeMethods.NMTOOLBAR) m.GetLParam(typeof(System.Windows.Forms.NativeMethods.NMTOOLBAR));
ToolBarButton button = this.buttons[lParam.iItem];
if (button == null)
{
throw new InvalidOperationException(System.Windows.Forms.SR.GetString("ToolBarButtonNotFound"));
}
this.OnButtonDropDown(new ToolBarButtonClickEventArgs(button));
Menu dropDownMenu = button.DropDownMenu;
if (dropDownMenu != null)
{
System.Windows.Forms.NativeMethods.RECT lparam = new System.Windows.Forms.NativeMethods.RECT();
System.Windows.Forms.NativeMethods.TPMPARAMS tpm = new System.Windows.Forms.NativeMethods.TPMPARAMS();
base.SendMessage(0x433, lParam.iItem, ref lparam);
if (dropDownMenu.GetType().IsAssignableFrom(typeof(ContextMenu)))
{
((ContextMenu) dropDownMenu).Show(this, new Point(lparam.left, lparam.bottom));
}
else
{
Menu mainMenu = dropDownMenu.GetMainMenu();
if (mainMenu != null)
{
mainMenu.ProcessInitMenuPopup(dropDownMenu.Handle);
}
System.Windows.Forms.UnsafeNativeMethods.MapWindowPoints(new HandleRef(lParam.hdr, lParam.hdr.hwndFrom), System.Windows.Forms.NativeMethods.NullHandleRef, ref lparam, 2);
tpm.rcExclude_left = lparam.left;
tpm.rcExclude_top = lparam.top;
tpm.rcExclude_right = lparam.right;
tpm.rcExclude_bottom = lparam.bottom;
System.Windows.Forms.SafeNativeMethods.TrackPopupMenuEx(new HandleRef(dropDownMenu, dropDownMenu.Handle), 0x40, lparam.left, lparam.bottom, new HandleRef(this, base.Handle), tpm);
}
}
}
