好的,这似乎太简单了,但我已经浪费了足够的时间来寻找如何做到这一点。我在移动设备上使用CE 6.5,我有一个带有六个MenuItem的ContextMenu。弹出菜单时,列表中的第一个项目会自动突出显示。我想删除这个突出显示,因为它让我的一些用户认为它是当前的状态令人困惑。我查看了ContextMenu及其所有变量和MenuItem,但没有找到如何删除第一项的自动突出显示。同样适用于MainMenu。
答案 0 :(得分:3)
我认为答案是,不幸的是,你做不到。我今天下午付出了很大努力来获取该菜单,我无法获得操作系统允许我使用的有效HMENU。如果你想继续尝试追逐我所处的路径,代码就在下面,但我真的认为这是一个死胡同。在这一点上,如果你真的需要这个功能,我会考虑P /调用菜单的一切(创建,人口等)。
using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;
using System.Runtime.InteropServices;
using UINT = System.UInt32;
using HMENU = System.IntPtr;
using HBITMAP = System.IntPtr;
using DWORD = System.UInt32;
using LPTSTR = System.IntPtr;
namespace MenuTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
contextMenu.MenuItems.Add(new MenuItem() { Text = "Item A" });
contextMenu.MenuItems.Add(new MenuItem() { Text = "Item B" });
contextMenu.MenuItems.Add(new MenuItem() { Text = "Item C" });
contextMenu.MenuItems.Add(new MenuItem() { Text = "Item D" });
this.MouseDown += new MouseEventHandler(Form1_MouseDown);
contextMenu.Popup += new EventHandler(contextMenu_Popup);
}
void contextMenu_Popup(object sender, EventArgs e)
{
var type = contextMenu.GetType();
var members = type.GetMembers(
BindingFlags.NonPublic | BindingFlags.Instance);
var menuMember = type.GetField("m_hmnu",
BindingFlags.NonPublic | BindingFlags.Instance);
var hMenu = (HMENU)menuMember.GetValue(contextMenu);
var info = new MENUITEMINFO();
info.cbSize = (uint)Marshal.SizeOf(info);
info.fMask = MIIM_STATE;
var result = GetMenuItemInfo(hMenu, 0, true, out info);
if (!result)
{
var err = Marshal.GetLastWin32Error();
if (err == 0x0579) MessageBox.Show("Invalid menu handle");
return;
}
info.fMask = MIIM_STATE;
info.fState &= (~MFS_HILITE);
result = SetMenuItemInfo(hMenu, 0, true, ref info);
}
void Form1_MouseDown(object sender, MouseEventArgs e)
{
contextMenu.Show(this, new Point(e.X, e.Y));
}
private const uint MIIM_STATE = 1;
private const uint MFS_UNHILITE = 0;
private const uint MFS_HILITE = 0x80;
//typedef struct tagMENUITEMINFO {
// UINT cbSize;
// UINT fMask;
// UINT fType;
// UINT fState;
// UINT wID;
// HMENU hSubMenu;
// HBITMAP hbmpChecked;
// HBITMAP hbmpUnchecked;
// DWORD dwItemData;
// LPTSTR dwTypeData;
// UINT cch;
//} MENUITEMINFO, FAR* LPMENUITEMINFO;
private struct MENUITEMINFO
{
public UINT cbSize;
public UINT fMask;
public UINT fType;
public UINT fState;
public UINT wID;
public HMENU hSubMenu;
public HBITMAP hbmpChecked;
public HBITMAP hbmpUnchecked;
public DWORD dwItemData;
public LPTSTR dwTypeData;
public UINT cch;
}
//BOOL SetMenuItemInfo(
// HMENU hMenu,
// UINT uItem,
// BOOL fByPosition,
// LPCMENUITEMINFO lpmii
//);
[DllImport("coredll", SetLastError = true)]
private static extern bool SetMenuItemInfo(HMENU hMenu, UINT uItem,
[MarshalAs(UnmanagedType.Bool)]bool fByPosition,
ref MENUITEMINFO lpmii);
//BOOL GetMenuItemInfo(
// HMENU hMenu,
// UINT uItem,
// BOOL fByPosition,
// LPMENUITEMINFO lpmii
//);
[DllImport("coredll", SetLastError = true)]
private static extern bool GetMenuItemInfo(HMENU hMenu, UINT uItem,
[MarshalAs(UnmanagedType.Bool)]bool fByPosition,
out MENUITEMINFO lpmii);
//HMENU GetSubMenu(
// HMENU hMenu,
// int nPos
//);
[DllImport("coredll", SetLastError = true)]
private static extern HMENU GetSubMenu(HMENU hMenu, int nPos);
}
}
修改强>
我知道我在某处做了所有这些代码。我们曾经出售过一个商业PopupMenu控件,它包含了所有P / Invokes以创建菜单。对照的销售额很小,所以我们几年前从我们的产品线中撤出了它。我现在已将其作为开源over on Codeplex发布。