我有一个ListBox,我想为列表中的每个项目添加一个上下文菜单。我见过这样的“解决方案”,即在空白区域右击选择一个项目并取消上下文菜单,但这个解决方案感觉很脏。
有没有人知道更好的方法?
发布于 2015-06-16 15:19:40
这样,菜单就会在鼠标旁边弹出
private string _selectedMenuItem;
private readonly ContextMenuStrip collectionRoundMenuStrip;
public Form1()
{
var toolStripMenuItem1 = new ToolStripMenuItem {Text = "Copy CR Name"};
toolStripMenuItem1.Click += toolStripMenuItem1_Click;
var toolStripMenuItem2 = new ToolStripMenuItem {Text = "Get information on CR"};
toolStripMenuItem2.Click += toolStripMenuItem2_Click;
collectionRoundMenuStrip = new ContextMenuStrip();
collectionRoundMenuStrip.Items.AddRange(new ToolStripItem[] {toolStripMenuItem1, toolStripMenuItem2 });
listBoxCollectionRounds.MouseDown += listBoxCollectionRounds_MouseDown;
}
private void toolStripMenuItem2_Click(object sender, EventArgs e)
{
var info = GetInfoByName(_selectedMenuItem);
MessageBox.Show(info.Name + Environment.NewLine + info.Date);
}
private void toolStripMenuItem1_Click(object sender, EventArgs e)
{
Clipboard.SetText(_selectedMenuItem);
}
private void myListBox_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Right) return;
var index = myListBox.IndexFromPoint(e.Location);
if (index != ListBox.NoMatches)
{
_selectedMenuItem = listBoxCollectionRounds.Items[index].ToString();
collectionRoundMenuStrip.Show(Cursor.Position);
collectionRoundMenuStrip.Visible = true;
}
else
{
collectionRoundMenuStrip.Visible = false;
}
}
发布于 2008-12-18 14:45:25
尽管ListBox拥有said...Even,但为了进一步说明Frans拥有ContextMenuStrip的功能,您仍然可以在打开菜单条时自定义菜单条中的项目。从而根据鼠标在列表框中的位置自定义它的内容。
下面的示例基于鼠标右键单击来选择列表框中的项目,然后根据用户右键单击的项目自定义上下文菜单条。这是一个简单的示例,但应该可以让您上手:向表单添加一个列表框,并添加以下代码:
#region Private Members
private ContextMenuStrip listboxContextMenu;
#endregion
private void Form1_Load( object sender, EventArgs e )
{
//assign a contextmenustrip
listboxContextMenu = new ContextMenuStrip();
listboxContextMenu.Opening +=new CancelEventHandler(listboxContextMenu_Opening);
listBox1.ContextMenuStrip = listboxContextMenu;
//load a listbox
for ( int i = 0; i < 100; i++ )
{
listBox1.Items.Add( "Item: " + i );
}
}
private void listBox1_MouseDown( object sender, MouseEventArgs e )
{
if ( e.Button == MouseButtons.Right )
{
//select the item under the mouse pointer
listBox1.SelectedIndex = listBox1.IndexFromPoint( e.Location );
if ( listBox1.SelectedIndex != -1)
{
listboxContextMenu.Show();
}
}
}
private void listboxContextMenu_Opening( object sender, CancelEventArgs e )
{
//clear the menu and add custom items
listboxContextMenu.Items.Clear();
listboxContextMenu.Items.Add( string.Format( "Edit - {0}", listBox1.SelectedItem.ToString() ) );
}
希望能有所帮助。
发布于 2008-12-18 08:14:22
没有其他方法:上下文菜单不归列表框中的项所有,而归列表框本身所有。它类似于treeview控件,它也拥有上下文菜单,而不是treenode。因此,只要选择了列表框中的某一项,就根据所选的项设置列表框的上下文菜单。
https://stackoverflow.com/questions/376910
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