鼠标滚轮滚动工具条菜单项

问题描述

我有一个包含许多菜单项一些菜单。鼠标滚轮不会滚动它们。我必须使用键盘箭头，或单击箭头在顶部和底部。
是否可以使用鼠标滚轮滚动工具条的菜单项？
谢谢

I have some menus that contain many menuitems. Mouse wheel doesn't scroll them. I have to use the keyboard arrows or click the arrows at top and bottom.Is it possible to use the mouse wheel to scroll toolstrip menu items?Thanks

推荐答案

一个有效的解决方案：

1. 注册表单的鼠标滚轮事件和 DropDownClosed 你的根事件 MenuStripItem （这里，rootItem）在加载的形式

1. Register for MouseWheel event of your form and DropDownClosed event of your root MenuStripItem (here, rootItem) in the Load event of the form

    this.MouseWheel += Form3_MouseWheel;
    rootItem.DropDownOpened += rootItem_DropDownOpened;
    rootItem.DropDownClosed += rootItem_DropDownClosed;

添加键盘代码类模拟按键

public static class Keyboard
{
    [DllImport("user32.dll")]
    static extern uint keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);


    const byte VK_UP = 0x26; // Arrow Up key
    const byte VK_DOWN = 0x28; // Arrow Down key

    const int KEYEVENTF_EXTENDEDKEY = 0x0001; //Key down flag, the key is going to be pressed
    const int KEYEVENTF_KEYUP = 0x0002; //Key up flag, the key is going to be released

    public static void KeyDown()
    {
        keybd_event(VK_DOWN, 0, KEYEVENTF_EXTENDEDKEY, 0);
        keybd_event(VK_DOWN, 0, KEYEVENTF_KEYUP, 0);
    }

    public static void KeyUp()
    {
        keybd_event(VK_UP, 0, KEYEVENTF_EXTENDEDKEY, 0);
        keybd_event(VK_UP, 0, KEYEVENTF_KEYUP, 0);
    }
}

添加代码 DropDownOpened ， DropDownClosed ，鼠标滚轮事件：

bool IsMenuStripOpen  = false;

void rootItem_DropDownOpened(object sender, EventArgs e)
{
    IsMenuStripOpen = true;
}


void rootItem_DropDownClosed(object sender, EventArgs e)
{
    IsMenuStripOpen = false;
}

void Form3_MouseWheel(object sender, MouseEventArgs e)
{
    if (IsMenuStripOpen)
    {
        if (e.Delta > 0)
        {
            Keyboard.KeyUp();
        }
        else
        {
            Keyboard.KeyDown();
        }
    }
}

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