[英]How do I prevent my ContextMenu from being constrained to its container (Win Forms c#)
我写了一个自定义的Control
(自动完成TextBox
,其中(下)) ContextMenuStrip
以编程方式添加到窗体。
我的问题是,当控件生成的列表长于其父容器( Panel
, GroupBox
等)的高度时, ContextMenuStrip
的底部被隐藏。
我曾尝试调用.BringToFront()
但找不到任何克服此行为的方法。
任何帮助将不胜枚举,也可以随时窃取控制权:)
图。1。
/// <summary>
/// TextBox which can auto complete words found in a table column
/// Just set DataSource and DataListField and start typing - WD
/// </summary>
public class AutoComplete : TextBox
{
public DataTable DataSource { get; set; }
public string DataListField { get; set; }
private ContextMenuStrip SuggestionList = new ContextMenuStrip();
public AutoComplete()
{
this.LostFocus += new EventHandler(AutoComplete_LostFocus);
KeyUp += new KeyEventHandler(AutoComplete_KeyUp);
SuggestionList.ItemClicked += new ToolStripItemClickedEventHandler(SuggestionList_ItemClicked);
}
void AutoComplete_LostFocus(object sender, EventArgs e)
{
if (!SuggestionList.Focused)
{
SuggestionList.Visible = false;
}
}
void SuggestionList_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
this.Text = e.ClickedItem.Text;
SuggestionList.Visible = false;
this.Focus();
SuggestionList.Visible = false;
}
void AutoComplete_KeyUp(object sender, KeyEventArgs e)
{
if (null != DataSource && DataSource.Rows.Count > 0 && null != DataListField)
{
if (e.KeyCode != Keys.Enter)
{
if (SuggestionList.Items.Count > 0 && e.KeyCode == Keys.Down)
{
SuggestionList.Focus();
SuggestionList.Items[0].Select();
SuggestionList.BringToFront();
}
else if (this.Text.Length > 0)
{
SuggestionList.Items.Clear();
DataRow[] drSuggestionList = DataSource.Select("[" + DataListField + "] LIKE '" + this.Text + "%'");
foreach (DataRow dr in drSuggestionList)
{
SuggestionList.Items.Add(dr[DataListField].ToString());
}
SuggestionList.TopLevel = false;
SuggestionList.Visible = true;
SuggestionList.Top = (this.Top + this.Height);
SuggestionList.Left = this.Left;
this.Parent.Controls.Add(SuggestionList);
SuggestionList.BringToFront();
}
}
}
}
}
这是因为您通过将其TopLevel属性设置为false并将其添加到父控件的Control集合中而将其变成了子控件。 替换为:
SuggestionList.TopLevel = false;
SuggestionList.Visible = true;
SuggestionList.Top = (this.Top + this.Height);
SuggestionList.Left = this.Left;
this.Parent.Controls.Add(SuggestionList);
SuggestionList.BringToFront();
有了这个:
SuggestionList.Show(this.Parent.PointToScreen(new Point(this.Left, this.Bottom)));
请注意,如果CMS太高,它将与文本框重叠。
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