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我正在尝试实现一个按钮，该按钮在选中时具有下拉菜单，而在未选中时该菜单消失了。我的问题是当复选框或其菜单失去焦点时，我无法取消选中该复选框。

复选框的外观模式是按钮。

在此处输入图像描述

我的代码：

private void cbSettings_CheckedChanged(object sender, EventArgs e)
{
    if (cbSettings.Checked) {cmsSettings.Show(cbSettings, 0, cbSettings.Height);}
    else {cmsSettings.Hide();}
}

我试图取消选中 contextMenuStrip 的 VisibleChanged / Closed 事件上的复选框，但这导致菜单不隐藏（或隐藏并立即显示）。

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2 回答 2

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我认为您取消选中上下文菜单关闭事件上的复选框的方法是一个很好的方法，您需要的是一些“事件取消逻辑”（c），如下所示：

private void OnContextClosing(object sender, EventArgs e)
{
    _cancel = true;
    cbSettings.Checked = false;
    _cancel = false;
}

private void cbSettings_CheckedChanged(object sender, EventArgs e)
{
    if(_cancel)
       return;

    if (cbSettings.Checked) {cmsSettings.Show(cbSettings, 0, cbSettings.Height);}
    else {cmsSettings.Hide();}
}

这将使您的 CheckChanged 事件不会重新选中您的复选框。

于 2011-07-24T21:08:21.720 回答
1

当然，下面的示例不包含交换 CheckBox 的 BackGroundImage 以指示 CheckState 所需的代码。“连接”的事件应该是显而易见的。希望这会有所帮助。

// tested in VS 2010 Pro, .NET 4.0 FrameWork Client Profile
// uses:
// CheckBox named 'checkBox1
// ContextMenuStrip named 'contextMenuStrip1
// TextBox named 'cMenuSelectionInfo for run-time checking of results

    // used to position the ContextMenuStrip    
    private Point cPoint;

    // context click ? dubious assumption that 'right' = context click
    private bool cmOpenedRight;

    // the clicked ToolStripMenuItem
    private ToolStripMenuItem tsMIClicked;

    private void checkBox1_MouseDown(object sender, MouseEventArgs e)
    {
        cmOpenedRight = e.Button == MouseButtons.Right;
    }

    private void checkBox1_CheckedChanged(object sender, EventArgs e)
    {
        // positioning the CheckBox like this
        // is something in a 'real-world' example
        // you'd want to do in the Form.Load event !
        // unless, of course, you'd made the CheckBox movable
        if(checkBox1.Checked)
        {
            contextMenuStrip1.Show();
            cPoint = PointToScreen(new Point(checkBox1.Left, checkBox1.Top + checkBox1.Height));
            contextMenuStrip1.Location = cPoint;
        }
        else
        {
            contextMenuStrip1.Hide();
        }
    }

    private void contextMenuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
    {
        // assume you do not have to check for null here ?
        tsMIClicked = e.ClickedItem as ToolStripMenuItem;

        tbCbMenuSelectionInfo.Text = tsMIClicked + " : " + ! (tsMIClicked.Checked);
    }

    private void contextMenuStrip1_Closing(object sender, ToolStripDropDownClosingEventArgs e)
    {
        e.Cancel = checkBox1.Checked;
    }

    private void contextMenuStrip1_Closed(object sender, ToolStripDropDownClosedEventArgs e)
    {
        if (cmOpenedRight)
        {
            tbCbMenuSelectionInfo.Text += " : closed because : " + e.CloseReason.ToString();
        }
    }
于 2011-07-27T16:32:30.967 回答