我想以显示ToolStripDropDown
下拉菜单(或例如ComboBox
下拉菜单)的方式显示DateTimePicker
。因此,我在Form
中编写了以下代码:
private readonly ToolStripDropDown _toolStripDropDown = new ToolStripDropDown
{
TopLevel = false,
CanOverflow = true,
AutoClose = true,
DropShadowEnabled = true
};
public Form1()
{
InitializeComponent();
var label = new Label{Text = "Ups"};
var host = new ToolStripControlHost(label)
{
Margin = Padding.Empty,
Padding = Padding.Empty,
AutoSize = false,
Size = label.Size
};
_toolStripDropDown.Size = label.Size;
_toolStripDropDown.Items.Add(host);
Controls.Add(_toolStripDropDown);
}
private void button1_Click(object sender, EventArgs e)
{
_toolStripDropDown.Show(button1.Left, button1.Top + button1.Height);
}
当我单击按钮时,显示我的
ToolStripDropDown
,但是没有阴影,没有溢出,没有自动关闭。我究竟做错了什么?Label
中的ToolStripControlHost
是为了简单起见。我使用WinForms和.NET 4。更新:
如您所见,下拉菜单“ Ups”不会溢出窗口,没有阴影(
ComboBox
的下拉菜单同时具有阴影),甚至当我单击ComboBox
下拉菜单时,“ Ups”仍然可见。
最佳答案
您将控件作为窗体的父项,该窗体将其限制为该父级的ClipRectangle
。
删除TopLevel
名称,删除育儿,计算屏幕坐标中的位置,最后显示菜单:
private readonly ToolStripDropDown _toolStripDropDown = new ToolStripDropDown
{
//TopLevel = false,
CanOverflow = true,
AutoClose = true,
DropShadowEnabled = true
};
public Form4()
{
InitializeComponent();
var label = new Label { Text = "Ups" };
var host = new ToolStripControlHost(label)
{
Margin = Padding.Empty,
Padding = Padding.Empty,
AutoSize = false,
Size = label.Size
};
_toolStripDropDown.Size = label.Size;
_toolStripDropDown.Items.Add(host);
//Controls.Add(_toolStripDropDown);
}
private void button1_Click(Object sender, EventArgs e)
{
Point pt = this.PointToScreen(button1.Location);
pt.Offset(0, button1.Height);
_toolStripDropDown.Show(pt);
}
关于c# - 正确显示ToolStripDropDown,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21689528/